Air cleaner arrangement with end support for cartridge

[0001] The present invention relates to air filters. It relates in particular to air filters in which the main filter insert has an open end with an inwardly directed radial seal and a closed end. One of the elements of the projection / socket is located on the first end cap. The second element is located in the housing to securely support the main filter element.

Background Art [0002] Air filters are typically used to filter combustion air for internal combustion engines in various vehicles and other equipment such as: trucks; coaches; off-road construction machines; agricultural machinery; generating sets; etc. Such air filters generally include a housing, an air flow inlet and an air flow outlet. The removable and replaceable main filter insert is housed in the housing. The housing includes a service or access cover for selective access to the filter insert inserted for service. The filter element is usually serviced by removing it and either replacing it with a brand new one; regenerating and reinstalling; or by replacing with a previously used, but refurbished, cartridge.

[0003] Over the past 20 years there has been a significant development of filter cartridges that are sealed to the housing by a radial seal (either directed radially inward or directed radially outward). Examples are described in US 5,547,480; US 2006/0254229 A1; US 6,652,614; WO 2007/022171 A1; US 6,039,778; and US 6,955,701. In some cases, in such cartridges, the end of the cartridge is farther away from

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The seal is supported to counter cantilever movement. In systems such as US 5,547,480, as shown in Fig. 2 of this reference, support is provided by means of the access cover portion surrounding the closed end of the cartridge away from the seal. In systems such as US 6,652,614, support is provided by a projection on the access cover extending internally to the end of the cartridge away from the access cover. In WO 2007/009040 both are found.

[0004] Relatively recently some systems have also been developed to prevent the cartridge from rotating when it is installed. Examples are described in WO 2007/009040 and WO 2007/022171.

[0005] Alternatives have been sought to obtain good support for the main insert to counter cantilever movement. In some cases, it is also desirable to provide non-rotatable attachment of the filter cartridge inside the housing. In addition, it would be desirable to develop an air filter assembly system in which an attempt to install an unapproved cartridge (incorrect cartridge) is easily recognizable.

[0006] Air filter cartridges according to the preamble of claim 1 are known for example from US 2006/086075 A1 or

WO 2007/009040 A1.

Brief description of the invention [0007] Examples of specific solutions and special features have been described and shown. There is no particular requirement that the system incorporate all of the features characterized herein to obtain some of the benefits of the present disclosure.

[0008] In one aspect of the present invention there is provided an air filter cartridge according to claim 1. In another

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In an aspect of the invention there is provided an air filter assembly according to claim 12.

[0009] The term "outer end surface" in this context refers to a surface generally facing away from the first end cap.

[0010] The housing seal system may include a radially directed seal. In the example shown, the housing seal is a radially inward seal.

[0011] A projection / seat arrangement comprising the first and second elements is provided. One (e.g., the other) projection / socket element is located on the access cover. It usually comprises a serpentine annular element and may be either an annular projection or a ring-shaped seating groove. In the example described, the projection / socket element which is arranged on the access cover is a serpentine socket groove.

[0012] Another (i.e., the first) element of the projection / socket arrangement is arranged on the outer end surface of the end cap. It is adapted to engage with the access cover in a certain way.

[0013] Generally, the first and second members of the projection / seat system are coupled to provide cantilever support of the air filter cartridge at the other end. Typically and preferably, the first and second members of the projection / seat system are also coupled in a non-rotatable manner. In the present context, the term "non-rotating method" means that the coupling prevents the filter cartridge from rotating relative to the access cover (and thus the housing) once installed.

[0014] In a specific embodiment of the air filter assembly, as shown, the assembly includes a housing

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EP 2 175 960 B1 comprising an air stream inlet system and an air stream outlet system; and includes a housing body and an access cover; and a serviceable filter element placed functionally inside the housing. The access cover includes inside itself, in the example shown, a serpentine female groove. The cartridge includes a protrusion that fits into the serpentine nest groove in the access cover. In a typical application, due to the shape of the serpentine groove on the access cover, the insert is supported, after installation, to counteract rotation and cantilever movement.

Brief Description of the Drawings [0015] Fig. 1 is a schematic exploded perspective view of an air filter assembly not according to the claimed invention.

Fig. 2 is a schematic side elevational view of the air filter shown in Fig. 1; Fig. 2 shows selected parts in cross-sectional view to control interior detail.

Fig. 3 is a schematic enlarged side view of the outer end of the assembly shown in Figures 1 and 2.

Fig. 4 is a schematic view from the outer end towards the second, closed, end cap of the primary filter cartridge assembly of Figures 1-3.

Fig. 5 is a fragmentary schematic cross-sectional view taken substantially along the lines 5-5 in Fig. 4.

Fig. 5A is a schematic, fragmentary, enlarged view of a portion of the surface shown in Fig. 4.

Fig. 6 is a schematic side view from the end of the outer member of the access cover of the assembly of Figures 1-3. Fig. 7 is a schematic cross-sectional view

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Taken along line 7-7 in Fig. 6.

Fig. 7A is an enlarged, schematic, fragmentary perspective view of a selected portion of the inner surface of the access cover shown in Fig. 6; the enlargement is part of Fig. 1.

Fig. 7B is an enlarged schematic fragmentary view of a selected part of Fig. 7A, shown in plan view.

Fig. 8 is a schematic cross-sectional view showing the coupling between the insert of Fig. 5 and the access cover of Fig. 7.

Fig. 8A is an enlarged fragmentary view of a selected part of Fig. 8.

Fig. 8B is an exploded, enlarged, fragmentary schematic view corresponding to Fig. 8A.

Fig. 9 is a fragmentary, schematic view of the part of Fig. 1.

Fig. 10 is a schematic side elevational view of an embodiment of an air filter according to the present disclosure; Fig. 10 shows selected parts in cross-sectional view to control interior detail.

Fig. 11 is a schematic enlarged cross-sectional view of the air filter cartridge element of Fig. 10; Fig. 11 shows the parts in cross section.

Fig. 12 is a schematic, enlarged, fragmentary view of a selected part of Fig. 11.

Fig. 13 is a schematic end view of the filter cartridge of Fig. 11.

Fig. 14 is a schematic cross-sectional view of an end cap element of the filter cartridge of Fig.

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11, taken along line 14-14 in Fig. 13.

Fig. 15 is a second schematic cross-sectional view of an end cap element with the insert of Fig. 11; the cross section of Fig. 15 is taken along line 1515 in Fig. 13.

Fig. 16 is an enlarged schematic cross-sectional view of the access cover element of the air filter assembly of Fig. 10.

Fig. 17 is a schematic view of the inner surface of the access cover element of Fig. 16.

Fig. 18 is a schematic side elevational view of an alternative access cover element.

Fig. 19 is a schematic cross-sectional view of the alternative access cover element of Fig.

18.

Fig. 20 is a schematic side elevational view of a second embodiment of an air filter according to the present disclosure; Fig. 20 shows selected parts in cross-sectional view to control interior detail.

Fig. 21 is a schematic side elevational view of an access cover element of the assembly of Figure 20.

Fig. 22 is a schematic end view of the outer access cover element of Fig. 21.

Fig. 23 is a schematic interior view of the access cover element of Fig. 21.

Fig. 24 is a schematic cross-sectional view taken along line 24-24 in Fig. 22.

Fig. 25 is a schematic enlarged fragmentary view taken along lines 25-25 in Fig. 22.

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Fig. 26 is a schematic enlarged elevational view from the end of the component of the closed end cap of the filter cartridge in the assembly of Fig. 20.

Fig. 27 is a schematic enlarged cross-sectional view of the end cap component of Fig. 26 taken generally along its line 27-27.

Fig. 28 is a view of the inside of the end cap of Figures 26 and 27.

Detailed description

I. Exemplary air filter assembly and components; Figures 1-9.

[0016] Identification number 1, Fig. 1 generally indicates an air filter assembly according to the present disclosure. The air filter assembly 1 includes a housing 2 having a housing body 3 and an access or service cover 4. The assembly 1 includes a removable and replaceable, i.e. serviceable, filter element 5.

[0017] With reference to Fig. 1, the housing 1 (in particular the housing body 3) includes therein mounting inserts 8 for attachment to the vehicle frame or other device on which the air filter assembly 1 is mounted for use. Different orientations of the mounting inserts 8 may be used within the principles of the present disclosure. In some systems, instead of mounting inserts formed integrally with the housing body, a mounting band arrangement may be used.

[0018] Generally, the housing body 3 comprises a side wall 10 having a first open end 11 and an opposing second end 12 with a first air flow passage 13 therein. The housing 2 further comprises, in the example shown, a second airflow passage 15.

[0019] In this particular example shown, a channel

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The air flow stream 13 is an air flow outlet passage defined by the outlet pipe 13a; and the airflow channel 15 is an airflow inlet channel defined by the inlet pipe

15a. It should be noted that, the flow channels 13a placed in the body in the example shown, both air flow 15a are housings.

described

In some alternative applications of the base document, one of the air flow channels, e.g. the inlet air channel 15, may be located in the access cover 4.

[0020] Furthermore, in the example shown, each air flow channel 13a, 15a is a single opening. However, in alternative techniques of use herein, one or more flow channels 13a, 15a may be defined by a plurality of holes.

[0021] The air stream inlet 15 provides the air flow to be filtered to the air filter 1. The specific air stream inlet 15 shown is arranged to direct the air through the side wall 10.

[0022] In operation, the air filter element 5 is inserted into the housing body 3 through the open end 11. Next, an access cover 4 is mounted on the open end 11 and the insert 5 to close the open end 11. In the example shown, the housing 2 comprises the closing system 20 comprising a plurality of latches 21. The access cover 4 is secured in place at the end 11 of the housing by means of a locking system 20. In this particular example of the air filter system 1 shown, the closure system 20 (including latches 21) is mounted on the access cover 4 for selective engagement with the housing body 3. It should be noted that in some alternative applications

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In the techniques described herein, latches 21 may be located on the housing body 3 to engage the access cover 4.

[0023] Referring still to Fig. 1, the cartridge 5 generally includes a working medium package 25 extending between the first and second opposed end caps 26, 27. In a typical arrangement, the end cap 27 will be a closed end cap, i.e. there is no no through holes through which air can flow. However, end cap 26 will typically be an open end cap, including a central open hole 29 for airflow through it and around which the working medium packet 25 extends.

[0024] The working medium package 25 may comprise a working medium 25a selected from various types of working medium. The working medium package 25 may, for example, contain a pleated working medium, although alternatives are possible. In many systems, the working medium packet 25 will be equipped with one or more internal and external bearing inserts for the working medium 25a. Such support inserts may, for example, comprise plastic systems, expanded metal systems or porous metal systems.

[0025] In a typical working medium packet 25, the working medium 25a surrounds and defines an open interior 30. The opening 29 in the first end cap 26 is generally in an air flow relationship with an open interior 30. In this context, by "air flow relationship" and variants thereof, it is understood that the opening 29 enters the interior 30 and air can flow between these two elements without flowing through the working medium packet 25.

[0026] It should be noted that described herein

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The techniques can be used and used with the main filter cartridge 5 and in addition with the secondary filter cartridge or safety filter cartridge. The example in the figures does not represent a safety contribution. However, the safety cartridge can be placed in the interior 30. This would require that the air, after flowing through the working medium 25a, flows through the safety cartridge before leaving the housing 2 through the air stream outlet 13.

[0027] A typical working medium package may be provided in various shapes, for example it may have a cylindrical shape, or may have a tapered taper. When the working medium packet 25 has a tapered taper, in a typical application this cone will be downward (inward) from the end cap 26 towards the end cap 27. A typical cone angle (inward convergence), when used, could be at least about 0.5 degrees, usually at least 1.0 degrees, and often in the range of 1.0 - 6.0 °, although solutions are possible alternative.

[0028] The specific air filter assembly 1 shown is configured for "forward" flow. The term "forward" in this context means that air, during filtration, generally flows through the working medium packet 25 from outside to the open interior (sometimes referred to as flow from outside to inside). Thus, when the air filter assembly 1 is in operation, the air to be filtered flows through the inlet 15 to the ring 35 (Fig. 2) inside the housing 2 (and access cover 3), which extends around the filter insert 5. Then the air flows through the working medium packet 25 to the open interior 30. Then the air flows from the insert 5 through the open end 29 and leaves the air filter through the outlet 13 intake air stream.

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[0029] In those cases where a safety filter is used, the air from the main filter cartridge 5 could flow through the safety filter, after flowing through the cartridge 5 and before flowing out through outlet 13.

[0030] Many of the principles described herein can be applied to systems with "reverse flow" or "flow from within to outside" in which air, while filtering, flows from the interior 30 through the working medium packet to a location outside.

[0031] In a typical operation, the housing body 3 is attached to a device, such as for example a truck, with which the air filter 1 is used and the access cover 4 is adapted to be separated from the main body 3 for service access to the cartridge 5.

[0032] Generally, the cartridge 5 includes a housing sealing system 38 on the end cap 26, sealed into the housing portion 2 when the cartridge 5 is installed.

[0033] Referring to Fig. 2 (comprising a body 3 configured for each

1, it should be noted that the housing and the access cover 4) is of these two elements which are to be formed of plastic, for example polypropylene with fiberglass filler. The principles described in this document are particularly suited to plastic systems, however they may be used when one or more of the components 3, 4 or parts of the components 3, 4 comprise sheet metal.

[0034] Note that an aerial vertical view is currently provided. In Fig. Fig. 2. In Fig. 2 of the side of the filter unit 1, the air filter unit 1 is shown with an access cover 4 attached to the housing body 3. Also in Fig. 2, part of the filter assembly 1

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The air is shown in cross-section so that the internal parts can be seen. Referring to Fig. 2, it shows an airflow ring 35 around the cartridge

5. An exemplary airflow ring 35, when in operation, extends completely radially around the cartridge 5 to distribute the air to be filtered around the cartridge 5.

[0035] Referring to Fig. 2, end cap 26 is visible in cross-section. Generally, the cartridge 5 includes a housing sealing system 38 on the end cap 26, sealing this portion relative to the housing 2 when the cartridge 5 is installed. The end cap 26, in the particular example shown here, defines a radial sealing portion 38a around the opening 29. The radial sealing portion 38a is generally oriented such that it forms an inwardly directed radial seal with respect to the outer surface of the pipe 39 when the insert 5 is installed. Such inwardly directed radial sealing systems are described, for example, in

US 5,547,480; 6,652,614; WO 2007/022171; 6,039,778 and 6,955,701. It should be noted that in the cartridge 5 and housing 3 of the present disclosure, alternative positions and sealing the housing. Radial seals can be directed outwards, although other alternatives are possible.

Many system configurations can be used, for example, used [0036] A variety of specific solutions can be used to form the inwardly directed radial sealing portion 38a. In a typical arrangement, end cap 26 will be an in-place end cap containing foamed polyurethane, such as those described in US 6,955,701. Such materials may be formed during the molding process to define the radial sealing portion 38a in the aperture 29.

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[0037] Still referring to Fig. 2, it should be noted that with the specific example of the air filter assembly 1 shown, the insert 5 is long enough to enter inside the access or service cover 4. For example, referring to to Fig. 2, part 5x of the cartridge 5 extends beyond the housing body 3 into the inside of the access cover 4. In a typical example, this extension would be at least 30 mm, and typically in the range of 40-75 mm, inclusive, the length of the insert between end caps 26 and 27. However, the principles described herein can be used in systems where the separation line ( indicated by 40, Fig. 2) between the access cover 4 and the housing body 3 is located outside the end cap 27, away from the end cap 26.

[0038] Referring to Fig. 2, it can be seen that the air filter element 5, when installed, is attached to the end cap 26 around the pipe 39 and is supported in place. At the opposite end, i.e. at the end of the cartridge on which the end cap 27 is located, the cartridge 5 should be supported, or the air filter cartridge 5 will be cantilever supported relative to the housing tube. Support of the insert 5 through the housing 2 on the end cap 27, which prevents undesirable cantilever movement values, will be referred to as "cantilever" support or "cantilever end" support, or by similar terms. In this case, the cantilever support is provided in the end cap 27 by engaging between the access cover part 4 and the end cap part or cover 27, as described below.

[0039] In more general terms, a protrusion / seat arrangement is provided, with one element on the end cap 27 and the other element on the access cover 4, providing engagement in a manner that prevents cantilever movement of the insert 5 in the end cap 27.

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[0040] With reference to Fig. 2, the working agent 25a can be seen as having opposite ends 25b, 25c; end 25b is adjacent end cap 27 and end 25c is adjacent end cap 26. Working medium 25a, and thus insert 5, is supported at end 25c by inserting pipe 39 into end cap 26. However, end 25b away from end 25c, is cantilever. In this specification, "cantilever movement" and variants thereof means reference to (non-rotational) movement that could occur at the end 25b away from the tube 39 if the end cap 27 is not properly supported. The specific movement concerned with respect to cantilever movement is oscillating movement, i.e. non-rotating movement. Then the cantilever movement would be an up and down movement of the working medium end 25b, or a backward and forward movement of the working medium end 25b, or some combination thereof.

[0041] Thus, in general terms, the cantilever support is a support of the insert 5 to prevent undesirable levels of cantilever movement. That is, no effort is necessary to prevent any oscillating movement, but only to prevent that movement beyond a certain acceptable level.

[0042] The coupling of the end cap 26, for the example of the air filter assembly illustrated, is a circular, inward-facing radial seal. Thus, it is radially symmetrical and susceptible to potential rotation of the insert 5 around the tube 39. Support in the end cap 27 by engaging between the end cap 27 and the access cover 4 (as described herein) also prevents relative rotation of the cartridge 5 relative to the access cover 4, when installed. Since the access cover 4 is fixed in place on the body 3, this prevents the cap from rotating

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After installing the insert 5.

[0043] The coupling between the access cover 4 and the insert 5, which prevents undesirable levels of rotation of one element relative to the other, will be referred to herein as "non-rotatable" coupling. Again, since the access cover 4 is generally non-rotatably in place in the housing body 3, through the system 20, the non-rotatable coupling between the access cover 4 and the insert 5 prevents rotation of the insert 5 around the pipe 39 after installation.

[0044] Still with reference to Fig. 2, the access cover 4 includes an ejection window 45 therein. In operation, water and / or dust can be ejected through the window 45. Typically, the air filter 1 is installed such that the ejection window 45 dust and water are placed at an angle down.

[0045] Referring again to Fig. 2, it should be noted that the access cover 4 does not include any projection or cover extending axially from it (towards the end 12 of the body 3) and with a distance inward from the side 4x that also surrounds the insert 5. The lack of such a cover facilitates the flow of air around the end 27 and the directing of dust and water towards the evacuation outlet 45. This also means that no part of the working medium in 25 is obstructed against the flow around it.

[0046] Alternatively, the access cover 4 includes an outer rim 4x that engages the body 3 when the access cover 4 is mounted. The edge portion 4x, Fig. 2, is only a part of the access cover 4, in the example shown, which surrounds the outer side part of the working medium packet 25.

[0047] Still referring to Fig. 2, it should also be noted that in the specific example of the cartridge 5 shown, no part of the end cap 27 projects into the interior 30a

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To a significant degree; a significant degree in this context means a projection of 10 mm or more. Thus, in the particular example shown here, there is no structure protruding 10 mm into the interior of the cartridge around which the working medium package extends.

[0048] In Fig. 2, exemplary dimensions for the illustrated example of an air filter system are as follows: AA = 31.9 mm; AB = 52 °; AC = 582 mm; AD = 190 mm; AE = 263.6 mm; AF = 184 mm; AH = 366 mm; AG = 182 mm; AI = 34 mm; AJ = 60 mm; AM = 280 mm; AK = 50.5 mm; and AL = 54 mm. Other dimensions can be estimated by scale.

[0049] Of course, dimensions are to be understood only as indicative of a usable example system. Alternative dimensions and arrangements may be used in accordance with the principles of the present disclosure.

[0050] Let us now pay attention to Fig. 3. Fig. 3 is an elevational view from the end of the air filter assembly 1. In Fig. 3, the view is directed towards the end 12 of the housing and the outlet 13. Here is also seen an arrangement 8 of inserts for attaching the housing 2 for placement on the device.

[0051] In Fig. 3, a view can be seen through the pipe 13 into the interior 30 of the cartridge 5.

[0052] In Fig. 3, exemplary dimensions of the air filter assembly 1, Figures 1-3, are as follows: BA = 180 mm; BB =

83.5 mm; BC = 45 °; BE = 90 °; BK = 300 mm; BG = 141 mm, BH = 153 mm, BD = D 10 mm; and BF = 5 mm.

[0053] Referring again to Fig. 2, for the specific insert 5 shown, the end cap 27 is a closed end cap, not having a through hole, and extending through the end 25b of the working medium packet 25; the opposite end 25c of the agent packet 25

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The working cap is embedded in the end cap 26. For a typical system, although alternatives are possible, the end cap 27 will comprise a pre-formed element to which the working medium packet 25 is bonded by means of adhesive or sealing material. Typically, end cap 27 will contain a pre-formed plastic material, such as ABS, bonded with hard polyurethane.

[0054] Alternatively (and as discussed above) in a typical application, end cap 26 will be formed in place with a resin suitable to form a soft, compressible structure, i.e. the working agent packet 25 will be introduced into the material of end cap 26 during curing of the material and will formed into a designed shape. Although not required, this will be typical for any application of this policy.

[0055] The end cap 27, by contrast, is typically formed first from a material suitable for forming parts from a rigid material, and then is attached to the end 25b, for example with a binding adhesive. Although alternative solutions are possible, it will be typical and convenient.

[0056] Fig. 4 is an end view of the cartridge 5. The end view of the cartridge 5 is shown facing the end cap 27. Thus, the structured surface seen in Fig. 4 is the outer surface 27x of the end cap 27 , Fig. 2.

[0057] In Fig. 4, exemplary dimensions and angles are as follows: CA = 45 °; CB = 22.5 °; CC = 3.3 mm radius; CD = 5.4 mm radius; CF = 16.8 mm radius; CG = 3.5 mm radius; CI = 41.6 mm diameter; and CH = 87 mm diameter.

[0058] In Fig. 5, a sectional view is shown

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Along the transverse line 5-5, Fig. 4. Here, both the outer surface 27x and the inner surface 27i are visible in the end element 27.

[0059] Fig. 5 is a fragmentary cross-sectional view. The end 25b of the working medium packet 25 is visible in the fragmentary view.

[0060] Referring to Fig. 5, the end cap 27 includes an outer rim 51. The outer rim 51 is matched around (surrounds) the working medium packet 25. Along the inner surface 27i, the end member 27 includes a rib 53. The rib 53 acts during assembly as a support for the working medium. That is, when the working medium package 25 is seated at the end 51, the working medium package 25 rests on rib 53 during binding.

[0061] The projection 55 forms the inside of the housing ring for the working medium and binding material packet (external constraint is provided by the rim 51). That is, when assembling the insert 5, the working medium packet 25 is positioned such that its end 25b is oriented between the rim 51 and the inner projection 55. The binding material is positioned here to secure the end element 27 in place on the medium packet 25 working. The support rib 53 will ensure that the sealing or tie material can form a seal between the end 27b of the working medium packet 25 and the peripheral annular portion 58 of the inner surface 27i.

[0062] It has previously been discussed that in a typical arrangement, although alternatives are possible, there is no protrusion extending substantially inward 30 from the end cap 27. It can be seen that the protrusion 55 is relatively small and does not enter 10 mm into the interior 30.

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[0063] Then, with reference to Fig. 4, the end surface 27x includes an outer annular section 65 overlapping the working medium packet in the cartridge 5. The outer surface 27x further includes an inner central portion 66 surrounded by an outer ring 65 Central part 66, in cartridge 5, Fig. 2, does not coincide axially with the interior of the working medium packet 25, but rather overlaps the inner area 30, which is surrounded by the working medium packet 25.

[0064] With reference to Fig. 4, area 65 and rim 51 may be considered to have a circular orientation about the center 27 of the end cap 27.

[0065] Generally, the present specification uses a projection / socket for coupling between the cartridge 5 and the access cover 4. In particular, the illustrated projection / socket arrangement provides for coupling between the end cap 27 of the cartridge and the access cover 4 in such a way that it supports the cartridge 5 against undesirable levels of cantilever movement in the end cap 27; and prevents relative rotation between the cartridge 5 and the access cover 4 (and thus between the cartridge 5 and the outlet pipe 39 in the air filter assembly 1).

[0066] Generally speaking, the projection / seat arrangement comprises a projection on the first element, one of the insert 5 and the access cover 4; and a female member on the remaining member, one of the access cover 4 and a cartridge 5. In this particular example shown, the projection / socket arrangement includes a projection (first) on the cartridge 5, and a female element (second) on the access cover 4; however, alternatives are possible.

[0067] With reference to Fig. 5, the central portion 66 of the outer surface 27x of the end cap includes a projection 70 thereon. In general terms, the arrangement

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Protruding 70 projects from the remaining portion of the end cap 27 in a direction from the end 256 of the working medium packet 25; that is in the general direction from the opposite end cap 26. The length of the projection 70, indicated by the dimension CJ, Fig. 5, is typically at least 10 mm, usually at least 15, and often in the range from 20 to 40 mm. In the example shown, the dimension CJ is 25 mm.

[0068] The direction of the projection 70 is generally axial, i.e. in the direction corresponding to the general direction of the central axis X, Fig. 2 and away from the end cap 26. By "axial", in this context, it should not be understood that the projections of the outer surface and inside 70o, 70i, and projection 70 must necessarily be exactly parallel to the X axis. In fact, each of them may be slightly inclined at an angle to the X axis.

[0069] Typically, the outer surface 70o slopes inward along the extent of extension from the adjacent region of the end cap 27; and the inner surface 70i slopes outward along its extension direction from the adjacent region of the end cap 27. This inward angle of the surface 70o is designated CK, and is generally in the range 3-7 °; inclusive. The corresponding angle of extension on the outside of surface 70i is designated by CM and is typically in the range of 3-7 °; inclusive. In the example shown, Fig. 5, each of CK and CM is 5.6 °.

[0070] Angles relative to the surface 70o, 70i of the indicated type provide a projection 70 with an axially outermost tip 70t that is slightly tapered relative to the base area 70b of the projection 70. The slightly tapered tip 70t facilitates insertion into the female arrangement, described below, on the access cover 4.

[0071] Let us now pay attention to Fig. 5A, schematic

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Fragmentary top view of the projection system 70, taken in the general direction of the arrow 80, Fig. 5. It should be noted that in Fig. 5A the schematic representation illustrates the overall shape of the projection 70 in top view and does not depict the slope of the sides 70o, 70i.

[0072] With reference to Fig. 5A, although alternatives are possible, this particular protruding system 70 shown has a continuous wall 84. The term "continuous" in this context means that there are no gaps in the wall 84 relative to the extent around the circumference of the designated through wall 84, i.e. around center 27z.

[0073] Furthermore, although alternatives are possible, the wall 84 is completely "closed". By this is meant that the wall 84 does not contain any through holes in its continuous extent.

[0074] With reference to Fig. 5, in cross section, it should also be noted that in the particular example shown, projection 70 is entirely "solid"; there is no empty interior between surfaces 70o, 70i. It will be typical and comfortable.

[0075] The protruding system 70 has generally a minimum largest external dimension across, corresponding to the dimension D1, Fig. 5A, of at least 35 mm, and often in the range from 40 to 100 mm. The reason for this is that it facilitates coupling to the access cover 4, in a typical preferred solution.

[0076] This particular illustrated wall 84 surrounds the open and recessed portion 85 of the inner surface. This part typically has the smallest internal access dimension, shown as D2, of at least 15 mm, typically at least 20 mm, and often in the range of 30 to 90 mm.

[0077] Typically, projection 70 is configured around the center

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27z in such a way that the minimum largest transverse dimension, denoted by D1, can be measured in at least two directions at right angles to each other; that is, D1 indicated in Fig. 5a could also mean the minimum largest dimension in a direction perpendicular to the line D1. Furthermore, typically, the configuration of the projection 70 is such that the smallest internal dimension across, indicated by D2, is met in two directions, with the first direction being, for example, the one indicated by line D2, and the second dimension being perpendicular to the first dimension .

[0078] Typically, projection 70 has a depth from its tip 70t over a distance of at least 6 mm (and typically at least 12 mm) in which the thickness of projection 70 does not exceed 10 mm, but is typically at least 4 mm (apart from narrowing at the same This would be, for example, the width between the walls 70i, 70o extending inwardly from the tip 70t at least to a depth of 25%, and typically at least 35% of its protruding extent. Of course, near base 70b, Fig. 5, projection 70 may be slightly thickened (widened).

[0079] The specific illustrated closed continuous wall 84 has a serpentine outer surface 88 and a serpentine inner surface 89, corresponding to surfaces 70o, 70i, respectively. By "serpentine" in connection with the outer surface 88, it should be understood that the outer surface 88 extended around the center 27z does not define a series of straight lines or even a circle, but rather a series of alternating internal and external curves. In the example shown, the serpentine surface 88 includes a plurality of radially outwardly convex sections 88c, and a plurality of radially outwardly concave sections 88d alternating with each other.

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[0080] With reference to outer surface 88, reference to "radially outwardly convex section 88c" means reference to a surface section 88 that is curved outward; and reference to "radially outwardly concave sections 88d" means reference to surface sections 88 that curve inwardly.

Similarly, the radially inwardly facing inner surface 89 is also a serpentine comprising a plurality of radially inwardly convex sections 89c and radially inwardly concave sections 89d alternating with each other when the inner surface 89 extends around the center 27z. For the example shown, each concave section 89d of inner surface 89 corresponds to and is radially aligned with the convex section 88c of outer surface 88; and each convex section 89c of inner surface 89 is radially aligned with the concave section 89d of outer surface 88.

[0082] In this particular example shown, the wall 84 defines, in each of the outer surface 88 and the inner surface 89, eight concave sections and eight convex sections. In addition: (a) the curvature of each convex section 88c of surface 88 is the same as any other convex section 88c in surface 88, and (b) the curvature of each concave section 88c is the same as any other concave section 88d. The same is true for each convex section 89c and each concave section 89d. The result is a regular "lobed" shape of the projection 70. By "lobed" in this context it should be understood that, when viewed from above, the projection 70 can be seen as having a plurality of outwardly projecting lobes, i.e., curved sections. By the term "regular" in this context is meant everyone

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The outwardly projecting petal has the same shape as any other outwardly projecting petal. With reference to Fig. 5A, it should also be noted that the center of each convex section 88c in the outer surface 88, in the example shown, can be seen as defining the apex of the octagonal shape indicated by the dashed lines 95. In addition, each center point of each concave section 89c in surface 89 can be seen as defining a center point in the side of the inwardly placed octagon, shown in dashed line 96. Octagons 95, 96 are aligned radially one apart.

[0083] In more general terms, the serpentine projection 70 includes a plurality of outwardly convex petal sections and inwardly concave sections providing serpentine extent of the wall protrusion 70 around center 27c.

[0084] Typically, for the reasons discussed below, the curvature of each outwardly convex section 89c is such that it has a smaller radius of curvature than the hypothetical curvature of such section if it were directed toward, or placed on, a circle centered on center 27z. This is evident by reference to Fig. 4 and comparing the curvature of the circle C1 to the curvature of the outer convex sections 88c.

[0085] With reference to Fig. 5, the indicated dimensions are as follows: As previously mentioned, CJ = 25 mm; CK = 5.6 °; and CM = 5.6 °. In addition, CL = 4 mm radius; and CN = 5 mm radius.

[0086] Let us now pay attention to Figures 6 and 7, in which parts of the access cover 4 are visible. It should be noted that in Figures 6 and 7 the access cover 4 is shown, for convenience, without the closing system therein.

20.

[0087] Referring to Fig. 6, a view of the cover is shown

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The access 4 is generally directed towards the outer surface 4y. Fig. 7 shows a cross-sectional view taken along line 7-7, Fig. 6.

[0088] Referring to Fig. 7, the access cover 4 generally includes an end wall 100 and a side wall 101; the side wall 101 corresponds to the side wall 4x, Fig. 2. The side wall 101 has an open end 101a positioned and with dimensions enabling engagement with the housing body 3, Fig. 1. The side wall 101 in the example shown has such dimensions that it surrounds part of the insert during assembly 5. Central section 100 is the central end section of the access cover 4, which includes a water / dust ejection window 45. In use, window 45 would typically be equipped with a valve member.

[0089] Still referring to Fig. 7, the access cover 4 includes an inner surface 4i with a central area 100i. The central area 100i includes therein a second projection / seat element 105. This second projection / socket element 105 is dimensioned, configured and positioned to selectively engage the first projection / socket element in the cartridge 5.

[0090] In this particular air filter 1 assembly 1 discussed so far, the insert 5 comprises a projection 70 of the projection / seat arrangement. Thus, the access cover 4 includes a female element 110 arranged to engage the projection 70.

[0091] With reference to Fig. 7, the female element 110 defines a female groove 111 in the inner surface 4i of the cover. The female groove 111 extends generally around the central axis Y on the access cover 4. It should be noted that in this particular case, the groove 111 is not centered around the Y line, but is rather eccentric relative to it.

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[0092] Fig. 7A is a fragmentary, schematic perspective view of the female groove 111. The groove 111, Fig. 7A is shown in a view corresponding to the enlarged part of Fig. 1.

[0093] With reference to Fig. 7A, the female groove 111 is defined between the outer wall 112 and the inner wall 113. The exemplary female groove 111 shown is continuous. The term "continuous" in this context means in this particular example shown that the groove 111 extends around the center 125, Fig. 7A, along a continuous unbroken path; that is, the groove 111 does not contain any barriers or blockages along its extent.

[0094] Let us now pay attention to Fig. 7B. Fig. 7B is a schematic top view of the groove 111. The schematic top view in Fig. 7B does not show the convergence of the side walls, but otherwise shows the overall shape.

[0095] This particular female groove 111 is serpentine having convex sections 115 and concave sections 117 alternately with respect to each other. In this specification, a reference to a "convex" section in this context means a reference to an outer arch or bend relative to center 125, and a "concave" section means a reference to an inner bend or projection toward center 125. Of course, the outwardly "concave" section could be characterized as an inwardly convex section.

[0096] Analogously to projection 70, in a typical arrangement, the curvature of the convex sections 115 is generally chosen so that it does not lie on the circle surrounding the center 125 of the female groove 111. Typically, the curvature of each convex section 115 is selected to have a narrower curvature than corresponding circle around 125.

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[0097] This particular illustrated serpentine female groove 111 is defined by the outer wall 112 and the inner wall 113. Then, the outer wall 112 has inner convex sections 112c and concave sections 112d; and the inner wall 113 has outer convex sections 113c and concave sections 113d. In this particular example shown, each of the walls 112, 113 is, independently, continuous, closed and solid.

[0098] In this particular example shown, the groove 111 has eight convex sections and eight concave sections. The groove 111 forms an octagonal or outwardly directed petal shape, as previously discussed with respect to projection 70, Fig. 5A.

[0099] The groove 111 is shaped to project into the projection 70 when the cartridge 25 is installed in the air filter 1, Fig. 2.

[0100] With reference to Figures 6 and 7, exemplary dimensions are indicated for assembly 1 as illustrated and described herein. Of course, alternative dimensions and alternative uses of these techniques described herein are possible. With reference to Fig. 7, DI = 26.3 mm; DJ = 8 °; DL = 9 °; DK = 3.5 mm; and DH = 2.8 mm. With reference to Fig. 6, DA = 10 mm; DB = 45 °; DC = 22.5 °; DD = 95.6 mm diameter; DE = 28.3 mm diameter; DG = 5 mm; and DF = 14.5 mm radius.

[0101] The female groove 111 will typically be at least 10 mm deep, usually at least 15 mm, and often in the range 20 - 40 mm deep, although alternatives are possible for some of the applications of the techniques described herein. Generally, the depth of the groove 111 should be understood as a dimension as shown by DI in Fig. 7.

[0102] Then the groove 111 can be seen as determined

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Between the walls 112, 113, which connect to each other along the base 115, Fig. 7A. In a typical seating arrangement 110, the groove 111 will have a width of no more than 14 mm, and typically a width of 5-12 mm inclusive, in an area extending from the bottom or base 115 for at least 60% of the distance toward the opposite open end 116, Fig. 7. Of course, adjacent the end 116, the groove 111 may expand significantly outward to facilitate engagement with the projection 70.

[0103] The width of the groove 111 and the corresponding thickness of the projection 70 should be selected such that after entering the projection 70 into the groove 111, the insert 5 cannot be easily rotated relative to the access cover 4, due to a jamming between the serpentine protrusion and the serpentine groove. This is due to selected curvatures for the concave and convex areas described.

[0104] Fig. 8 is a schematic cross-sectional view showing the end cap 27, Fig. 5 in conjunction with the access cover 4, Fig. 7. In particular, it can be seen that the projection 70, Fig. 5, is inserted inside the groove socket outlet 111, Fig. 7. Fig. 8A is an enlarged fragmentary view of the part of Fig. 8. Fig. B is an enlarged, exploded view.

[0105] Let us now pay attention to Fig. 9, an enlarged fragmentary view of the inlet 15, Fig. 1. Fig. 9 shows examples of dimensions as follows: ED = 180 mm; EH =

2.5 mm; EA = 2.5 mm; EE = 190 mm; EB = 2.5 mm EI = 2.5 mm; EF = 25.4 °; EJ = 20.4 °; EK = 51 °; EG = 41 °; EM = 8 mm radius; EC = 60 mm radius; and, EL = 300 mm radius.

II. Example of a protrusion / socket support system [0106] Referring again to Fig. 8, the system comprising the protrusion 70 and the female groove 111 is referred to herein, generally as the protrusion / socket arrangement 130,

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Enabling coupling between the access cover 4 and the insert 5 along the closed end cap 27 of the insert 5. The projection / seat arrangement 130 provides, for example, a support preventing the cantilever movement of the insert 5 inside the air filter housing 2, Fig. 2. That is, the insert 5 cannot move substantially up or down or backwards or forwards at the end 27, due to the support of the end element 27 by inserting the projection 70 into the groove 111 on the access cover 4.

[0107] Furthermore, this particular illustrated projection / socket arrangement 130 is an "anti-rotation" projection / socket arrangement. By this is meant that the insert 5 and the access cover 4 cannot rotate relative to each other after engagement of the projection / seat arrangement 130 (by means of the projection 70 entering the groove 111). This is due to the shape of the serpentine socket groove 111 and the serpentine shape of projection 70. In particular, this exemplary serpentine (petal) shape prevents the access cover 4 and the insert 5 from rotating relative to each other upon engagement. This is made possible by curvatures as described.

III. General principles [0108] Generally, as the example of Figures 1-9 shows, a protrusion / socket arrangement is provided for interaction between a part of the air filter housing and exactly the access cover and filter insert. An exemplary projection / socket arrangement includes a projection on the cartridge that may enter the socket (groove) on the access cover.

[0109] The protrusion on the filter cartridge is configured such that it is not necessary for the portion of the end cap on which the protrusion is located to protrude substantially (more than 10 mm) into the interior of the cartridge. Although this performance may be feasible in some cases, this is not a special requirement.

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[0110] The projection / seat arrangement operates to prevent cantilever movement of the closed end of the cartridge in any direction; and prevent the cartridge from rotating when placed in the housing. This is due to the fact that the socket is a groove having a non-circular, serpentine shape; and the projection is configured such that, after it enters the groove, undesirable levels of rotation and cantilever movement are prevented.

[0111] Supporting the closed end of the filter cartridge can be made around the ring without the need for a shielding / supportive stretching of the outside of the cartridge, but spaced inwardly from the outer wall of the access cover. Thus, the air flow in this area is not interrupted or disturbed. Furthermore, in this particular example illustrated, the air flow may flow into the end of the access cover, with a convenient direction of dust / water flow through the dust ejector, without the existence of a shield blocking direct air flow to a portion of the cartridge.

[0112] The system shown is also advantageous in that it can be used to prevent an unapproved or unauthorized insert air filter from being installed in the selected housing. Thus, it can be used to facilitate quality control by the air filter manufacturer, engine manufacturer and / or equipment owner regarding service parts.

[0113] The system shown is also advantageous because it is relatively cheap to implement. The access cover may be formed to have the necessary features and also be used as a closed end cap on the cartridge. Tolerances regarding the length of the insert as well as the inside and outside diameter of the refrigerant pack have no effect on the operation of the system

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EP 2 175 960 B1, to any significant negative degree.

IV. Additional Features [0114] Let us now pay attention to Fig. 7A. The seat 110 includes a system of 140 ribs surrounding its outer part. The arrangement of ribs 140 in the example shown comprises three radially spaced ribs 141, of which only two ribs are visible in Fig. 7. Ribs 141 generally extend from the outer area 145 adjacent the wall 4x to the inside of the seating system 110.

[0115] The arrangement of the ribs 140 does not allow the unauthorized insert to be supported by extending around the projection 110. Thus, in general, the replaceable insert would probably not be supported by the access cover 4 so as to prevent cantilever movement, unless the insert 5 would be also supported so as to prevent rotation.

[0116] It should be noted that during assembly, after moving the access cover 4 relative to the insert 5, sufficient to engage the projection / socket system, it may be necessary to slightly rotate the access cover until the latches 21 are rotatably aligned with the body parts 3 that they will be associated with. Such rotational movement is allowed by this assembly. However, after engaging these latches 20, the access cover 4, coupled to the insert 5, will prevent any undesirable level of further rotation.

V. Alternative Embodiments, Figures 10-19 [0117] An alternative is shown

Figures 10-17 show a first embodiment. In Figs. 18 and 19, an alternative embodiment of the cover

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EP 2 175 960 B1.

[0118] Referring first to Fig. 10, an alternate air filter assembly 301 is shown. Many features of this air filter 301 are analogous to those previously described. The air filter assembly 301 includes a housing 302 having a housing body 303 and an access cover 304. The filter cartridge 305 is assembled with the interior 302i of the housing 302. The housing 302 includes an intake system 312 and an exhaust system 313. The access cover 304 is removably attached to the housing to the body 303 for service access to the removable and replaceable filter cartridge 305. For the example shown, the access cover 304 is secured in place with the latch 315.

[0119] Fig. 10 shows sample dimensions as follows: FA = 31.9 mm; FB = 52 °; FC = 596 mm, FD = 263.6 mm; FE = 183 mm; FG = 182 mm; FH = 34 mm; FI = 60 mm; FJ = 50.5 mm; FK = 280 mm; and FL = 366 mm.

[0120] Fig. 11 shows a cartridge 305. The cartridge 305 includes a working medium package 350 containing a working medium 351 extending between the first and second end caps 352 and 353. The first end cap 352 may be substantially analogous to end cap 26, Fig. 2 The working medium package 350 surrounds and defines an open interior 360. The end cap 352 includes a central opening 352a surrounded by a sealing system 352b.

[0121] The end cap 353x has certain features analogous to the end cap 27 described above including the outer surface 353 having a central portion 360 including a projection 361 having an inner and outer serpentine surface 361i and 361o, respectively. In the case of the particular 305 cartridge shown, the projection 361 is located on a central, outwardly projecting,

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On the platform 370. The protruding platform 370 typically extends beyond the working medium package 350 to a distance of at least 10 mm, often at least 15 mm, for example 20 mm.

[0122] It should also be noted that the end cap 353 includes a plurality of spaced-apart projections 390 each of which extends axially from the refrigerant package 350, coinciding with the refrigerant package 350.

[0123] Fig. 11 shows sample dimensions as follows: GA = 45 mm; GB = 20 mm; GC = 12 mm; GD = 303.7 mm; GE = 168.6 mm; GF = 303.5 mm; and GG = 491.2 mm.

[0124] In Fig. 12, an enlarged fragmentary schematic view of the part of Fig. 11 is visible. It shows one of the projections 390. A part of the inner liner 395 around which the working medium 351 extends is also visible. In addition, the support ring 396 working.

[0125] Fig. 12 shows sample dimensions as follows: HA = 5.5 mm; HB = 8 mm.

[0126] Fig. 13 is a plan view from the end of the cartridge 305 taken towards the end cap 353. Distance-spacing projections 390 as well as the central serpentine projection 361 are visible here.

[0127] In Fig in Fig. 11.

you can see the section line determined [0128] On the cross section

Fig. 14 is a view of the end cap 353. The view is taken along line 14-14, cross section

Fig. 13, although Fig. 14 only shows the end cap 353 without the remainder of the working medium packet. Fig. 14 shows sample dimensions as follows:

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EP 2 175 960 B1

IA = 3.8 mm; IB = 303.5 mm; IC = 223.8 mm; ID = 10 mm; IE =

72.2 mm; IF = 2 mm; IG = 25 mm; and H = 3 mm. Again, projection 361 is visible having a serpentine inner surface 361i and a serpentine outer surface 361o, essentially as previously described.

[0129] Fig. 15 is an alternative cross-sectional view generally taken along the line 15-15, Fig. 14, but only showing the end cap 353. In this case, exemplary dimensions are as follows: JA = 65 mm;

JB = 45 mm; JC = 20 mm; JD = 8 °; JE = 81.5 mm.

[0130] In Fig. 16 a cross-sectional view of the access cover 304 is visible. It can be seen that the access cover 304 includes a serpentine female groove 410 shaped to project into the projection 361 and support the insert 305 both in a non-rotatable manner and preventing cantilever movement. Referring to Fig. 16, note the internal projection 420 in the access cover 304. The projection 420 on the access cover 304 helps ensure that the correct cartridge is placed inside the assembly 305.

[0131] Fig. 16 shows some examples of dimensions as follows: KA = 154.7 mm; KB = 128.4 mm; KC = 7 mm; KD = 3.5 mm; KE = 8 °; KF = 3.5 mm; KH = 366 mm; KI = 358.4 mm; KK = 354 mm; and KJ = 82.8 mm.

[0132] Fig. 17 is an end elevational view toward the inner surface of the access cover 304. It shows the seat 410 as well as the projection 420 and the injection window 450. Fig. 17 shows examples of dimensions as follows: LA = 15 mm; LB = 90 °; LC = 45 °; LD = 69 mm; LE = 110 mm.

[0133] The example of Figures 10-17 indicates the use of a projection 420 on the inner surface of the access cover 304 facing toward the cartridge 305. In addition, the cartridge 305 has projections 390 arranged radially in the

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At intervals around the outer edge of the cartridge 305, on the closed end cap 367, in a preferred manner.

[0134] Figs. 18 and 19 show an alternative access cover 504. An alternative access cover shows that alternative sides of the access cover can be used for assemblies of the present disclosure. For example, access cover 504 can be used in place of access cover 304. The features provided provide analogous operation. Referring to Fig. 18, in the example shown, the size MA = 121 mm.

[0135] Referring to Fig. 19, the access cover 504 includes a serpentine female groove 510 and a projection 520 having analogous operation to the analogous features in the previously described embodiments.

[0136] Referring to Fig. 19, exemplary dimensions are as follows: NA = 74.7 mm; NB = 48.4 mm; NC = 7 mm; ND =

3.5 mm; NE = 8 °; NF = 366 mm; NG = 358.4 mm; NH = 354 mm; NI = 82.8 mm; and NJ = 3.5 mm.

VI. Further Exemplary Features, Figures 20-28 [0137] In conjunction with Figures 20-28, additional features are shown in arrangements having general features as described previously. Referring first to Fig. 20, it shows the air filter assembly 600, schematically, in a side view, with parts cut off to show internal details. The air filter assembly 600 includes a housing 602 including housing body 603 and a removable access or service cover 604. In the example shown, the access or service cover 604 is secured in place with latches 607.

[0138] The assembly 600 includes a removable and replaceable, i.e. serviceable, filter cartridge 605.

[0139] Generally, the housing body 603 includes a side wall

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EP 2 175 960 B1

610 having a first open end 611 and an opposite second end 612 with an air flow channel 613 therein. In the example shown, housing 602 further includes a second air flow passage 615, in this case in housing body 603.

[0140] In analogy to the previous examples, in this particular example shown here, the air flow passage 613 is a flow outlet passage defined by the outlet pipe 613a, as shown by arrow 613b. The air flow passage 615 is the air flow inlet passage defined by the inlet pipe 616a.

[0141] Access cover 604 is removable from housing body 603 so as to leave housing body 611 open for inserting or removing the cartridge 605.

[0142] Cartridge 605 includes a working medium packet 625 extending between first and second opposed end caps 626, 627. In a typical arrangement, end cap 627 will be a closed end cap, that is, it has no through holes that it can flow through. air. However, the end cap 26 will typically be an open end cap, including a central flow opening 629 around which the working medium packet 625 extends.

[0143] Working medium 625 surrounds the open interior 630. The opening 629 is in the air flow system with the open interior 630.

[0144] In addition to the main filter cartridge 605, an auxiliary safety filter cartridge 631 is disposed in the open interior 30. Safety cartridge 631 includes a working medium 632 extending between the closed end cap 633 and the open end cap 634. Open

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The end cap 634 defines a central opening 635 in the airflow system with the opening 613a.

[0145] Main cartridge 605 includes a housing sealing system 638 on end cap 626, sealed in a removable manner in housing portion 602 when cartridge 605 is installed. Similarly, safety filter 631 includes a sealing system 639, detachably sealed to housing portion 602, when safety cartridge 631 is installed.

[0146] If necessary, the working medium in the cartridges 605, 631 may be provided with internal and / or external liners to support the working medium.

[0147] Still referring to Fig. 20, it should be noted that the air filter assembly 600 includes a protrusion / seating arrangement 640, including in the example shown, a first element 641 of the projection / seating 640, on cartridge 605; and a second projection / socket element 642 on access cover 604. Although alternatives are possible, in this particular example illustrated, element 641 is projection 641a; and element 642 is a female element, 642a. This is analogous to the previous embodiments described.

[0148] The projection / socket 640 arrangement may generally include a serpentine projection 641a and a serpentine socket 642a, in analogy to the previously described embodiments, although alternatives are possible.

[0149] By analogy with the access cover shown in Fig. 17, the access cover 604 includes a projection. This projection is generally indicated by 650, Fig. 25. The projection 650 is arranged radially outwardly from the socket 642a. In the example shown, the projection 650 does not extend radially completely around the central axis 604x, Fig. 25. This is analogous to

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Of projection 420, Fig. 17, although the shape is different. The projection 650 prevents an undesirably long cartridge from being installed inside the assembly 1, as this will collide with the projection 650.

[0150] Cartridge 605 is equipped with a closed end cap 627 having a plurality of projections 660. The protrusions 660 are shown in Fig. 26 in a view of the end cap 627 facing its outer surface 620. In this particular example shown, the end cap 627 shows eight projections 660 spaced radially at equal intervals, each substantially adjacent to the outer circumference of 627p. The projections 660 can be seen in the cross-sectional view of the end cap 627, Fig.

27. Each projection 660 is typically at least 10 mm long, typically at least 15 mm long, and often at least 20 mm long, dimension L in Fig. 27. The protrusions 660 ensure that the cartridge 605 can be mounted in the alternative air filter assembly in which have a support ring coupled to the projections 660, which projections 660 extend around the support ring to provide cantilever support. That is, the projections 660 are adaptive elements that allow the cartridge 605 to be installed in some alternative air filters, for example with an alternative type of cantilever support at the closed end 627 of the cartridge 605.

[0151] Let us now pay attention to Fig. 28. Fig. 28 shows the end cap 627 towards the surface 627i, which, when installed in the cartridge 605, forms the inner surface, Fig. 20.

[0152] Hooks 670 are shown on surface 627. Hooks 670 provide mechanical locking with the material

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EP 2 175 960 B1 2 5 10 15 20 25 30 35 40 45 50 55 binding material of hard polyurethane, when the end cap 627 is bound to the working medium 625, Fig. 20. The binding material is generally represented by 672, Fig. 20.

[0153] Referring to Fig. 21, a side view is shown of the access cover 604 rotated 180 ° relative to the orientation of Fig. 20. It should be noted that the projections 680 are visible as holders for latches 607, but in Fig. 21, the cover 604 access is shown without the latches therein.

[0154] Fig. 22 is an elevational view from the end of the access cover 604, the view of Fig. 22 being substantially toward the outer surface. At 684, an ejection window is shown. In place of 650x, an external view of the projection 650 is shown.

[0155] Fig. 23 is generally a view toward the inside surface of the access cover 604. A first set of projections or ribs 685 is shown here. The first set of projections or ribs 685 generally includes projections or ribs aligned radially on the inner surface 604i of the access cover 604. Ribs 685 are therefore collinear with rays. The projections or ribs 685 extend along the inclined surface area 604i, extending substantially outwardly. Ribs 685 prevent placement of an incorrect cartridge that attempts to resist to form surface 604i of the adjacent area.

[0156] Still referring to Fig. 23, a second set of projections or ribs 686 is provided. The projections or ribs 686 are substantially tangential, i.e. perpendicular to the radii, in the example shown there are six projections or ribs 686 generally defining the hexagonal pattern around the element socket 642a and some distance from it. These tabs or ribs 686 also prevent the use of an inappropriate portion of the surface in the interior 604i as the support surface for the cartridge.

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[0157] Fig. 24 is a schematic cross-sectional view taken generally along the lines 24-24, Fig.

22. In this case, one of the tabs or ribs 686 is visible in cross-section. Fig. 25, previously discussed, is a view substantially along the lines 25-25, Fig. 22.

[0158] It should be noted that in addition to the projections or ribs 685, 686 to prevent supporting the wrong insert in the housing, the projections or ribs 685, 686 also provide stiffening of the access cover 604 in the area surrounding the projection / seat 642.

[0159] Referring to Fig. 27, attention is paid to the axial centering ring 690 on the outer surface 627o of the end cap 627. The opposite surface 627i of the end cap 627 is also visible.

[0160] Referring to Fig. 20, the ring 690 is shown in an axial alignment with the projection 691 on the access cover 604. This area 691 of the access cover 604 is also visible in Fig. 24. The alignment between the projection 691 and the ring 690 again helps to provide that the correct cartridge is placed inside the housing 602.

[0161] In more general terms, the cartridge 605 includes on the end cap 627 an outer axial centering ring 690. This axial centering ring 690 is generally positioned to surround the projection 641a, and be radially spaced therefrom. The axial centering ring 690 is also an area of ​​axial projection outward from adjacent portions of end cap 627. The axial centering ring 690 is positioned coaxial with the ring 691 on cover 604, and in some cases rests on it. This engagement generally includes a ring 690 surrounding threshold 692, Fig. 24, on cover 604; with threshold 692 essentially at

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Adjacent to the inner portion of ring 691; ring 691 surrounds socket 642a.

[0162] Generally, the assembly of Figures 20-28 will operate in a manner analogous to the systems described previously. These additional characterized features help ensure that:

(a) the cartridge 605 is adapted to be placed in alternative air filter housings; and (b) the wrong cartridge is not installed in housing 602.

VII. Summary of the Detailed Description [0163] These figures describe and show a specific example of an air filter assembly having the features and components of the present disclosure. There is no particular requirement that the system contain all described and illustrated features in order to obtain some of the benefits of the present disclosure.

[0164] In general, an air filter assembly is provided. The air filter assembly includes an air filter housing defining the interior of the housing. The air filter housing generally comprises a housing body and an access cover.

[0165] In the example shown, the housing body defines a side wall and a first end with the housing end surface and an air flow duct passing therethrough. The outlet flow pipe protrudes both inside the housing body and outside the housing body, with the air flow passage extending through it.

[0166] The second inward end of the housing body, opposite the first end, is open and includes an access end for installing and removing the filter cartridge during use.

[0167] This housing generally includes an air stream inlet. This air stream inlet may be located

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EP 2 175 960 B1 in the housing body or access cover. In the example shown, the air inlet is a lateral inlet to the housing body. This solution will be typical.

[0168] The access cover includes therein a projection / socket element. In the example shown, although alternatives are possible, the access cover includes a socket in the form of a serpentine socket groove on the inner surface of the cover. The serpentine female groove is defined between the inner and outer serpentine side walls. By the term "serpentine" in this context is meant that the groove which extends completely radially around the center contains a plurality of alternating outwardly convex sections and inwardly convex sections (or outwardly concave sections). Preferably, the groove is configured not to define, inside the groove, a circular path on which there are no serpentine sections (i.e. alternating convex outwards and inwardly convex sections).

[0169] The serviceable filter cartridge is operably located within the housing. By "serviceable" in this context is meant that the filter cartridge can be installed in the housing and then removed from the housing without damaging the cartridge or the housing.

[0170] The filter cartridge includes a working medium package extending between the first and second end or end caps. The working medium package surrounds and defines the open interior of the filter.

[0171] Generally, the working medium packet includes a filtering working medium and may contain one or more different types of working mediums. A typical example

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EP 2 175 960 B1 contains a pleated working medium extending around the open interior. The accordion working medium can be in cylindrical or conical form.

[0172] The working medium package may include one or both inner and outer liners to support the working medium. Various inserts may be used, including, for example, plastic inserts or metal inserts. Typically, the inserts, when used, have an open volume to allow air to flow through them.

[0173] If the working medium is accordion, it may be provided with various arrangements for maintaining the spacing between the folds, including, for example, adhesive beads around the working medium packet, different types of corrugations in the working medium packet, and different types of folds in the medium packet working.

[0174] The first end cap of the example shown adapted for servicing the filter cartridge has an opening for the air flow passing through it. An example cartridge includes a sealing element thereon. An exemplary sealing element is provided that surrounds the airflow opening and is generally positioned such that it surrounds and seals the outer surface of the outlet pipe portion on the housing, along a portion extending into the housing.

[0175] In the example shown, the second end cap is typically a closed end cap and includes a projection / socket element. In the example shown, the closed end cap includes an outer projection system that projects from the first end cap. The external protruding system enters in a manner adapted to support, in a non-rotatable manner, inside the nest groove in the access cover.

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[0176] By "entering in a manner adapted to support the seating groove inwardly", it should be understood that the coupling of the outer projection system on the second end cap to the seating groove prevents undesirable levels of swaying of the end of the cartridge which is closed. up and down or from side to side in the housing. By entering in a "non-rotatable" way inside the socket arrangement is such that the insert cannot basically rotate independently of the access cover. As a result of the coupling between the protruding arrangement on the insert and the female groove, the insert is prevented from undesirably rotating inside the housing when the access cover is in place.

serpentine groove, between the outer understood that the protruding coupling and the groove [0177] In the typical assembly illustrated, the holding groove is a serpentine female groove, and this groove is a continuous groove, positioned between the first and second wall elements. By "continuous" in this context it should be understood that this groove is not interrupted by protrusions extending crosswise which would block the groove.

[0178] In a typical assembly, the serpentine holding groove has an extremely internal part (extremely internal 60%), the width of which is not more than 14 mm, in which at least part of the projection system enters. That is, the narrowest part of the serpentine holding groove, in which at least part of the protruding system enters, has a width of not more than 14 mm. Typically, this part of the holding groove has a width in the range of 5 to 12 mm, inclusive.

[0179] However, this does not mean that no part of the serpentine holding groove is wider. Contrary,

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This simply means that the narrowest, deepest part into which the protruding system enters is typically as defined, although alternatives are possible.

[0180] Typically, at least a portion of the projection arrangement extends at least 8 mm into the female groove, usually at least 12 mm, and often in the range of 15 to 30 mm inclusive.

[0181] Typically, the female groove is a serpentine female groove that comprises at least five (5) of each alternating concave and convex sections extending about the center. In a typical example, the serpentine female groove has a plurality of concave parts and convex parts extending around the center, including six (6) to ten (10) concave parts inclusive, and six to ten (6-10) convex parts. . It should be noted that the concave section can be seen as an inwardly convex section when viewed from the inside; and the convex section may be used as the outwardly oriented concave section when viewed from the inside.

[0182] In the specific example shown in Figures 1-9, the serpentine female groove comprises eight (8) convex sections (outward-facing concave sections, viewed from within) and eight (8) concave sections (inwardly convex sections, viewed from inside); these sections alternate relative to each other along the extent of the serpentine holding groove around the center.

[0183] It can be said that the serpentine holding groove, when formed of multiple flakes having the same size and shape, has rotational symmetry corresponding to the number of flakes. Thus, the presented arrangement of eight petals has eight-fold symmetry around

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Central axis. By this is meant that this configuration can be rotated by 1/8 of a turn and is still centered together, 2/8 of a turn, etc. A similar symmetry is used in the typical protruding arrangement shown.

[0184] In the example shown, Fig. 2, the access cover is provided with an external, e.g. circular, sidewall. A circular sidewall may, in some cases, surround parts of the cartridge in an assembled housing. In the example shown, the air filter element is housed in the housing, no part of the access cover other than the outer (circular) side wall surrounds the air filter element. That is, there is no inner casing or flange or insert support system or air flow control system that surrounds the insert at the closed end and which is inwardly spaced from the outer wall of the access cover.

[0185] In the example shown, the access cover includes an inner surface with a protruding area. The protruding area includes a female groove therein, and includes an inner wall and an outer wall, each of which extends a projection.

serpentine. The arrangement of the ribs is shown radially outward from the area. Each of the ribs extends generally towards the first end of the housing, from the access cover. There is typically at least one rib, usually at least two, often 3-5. In the example shown, there are three such ribs. These ribs provide strength and rigidity to the part of the access cover in which they are located. In addition, these ribs can be used to prevent the access cover from supporting the insert in a way that does not engage the female groove.

[0186] When these ribs are configured to prevent

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By supporting the insert as they protrude into the insert, these ribs are sometimes referred to herein as a non-cantilever support system).

[0187] In the example shown, the access cover includes a second arrangement of ribs, which arrangement of ribs comprises a plurality of tangentially oriented projections or ribs defining a rectangular pattern around a protruding area (including a recess) on the inner surface of the access cover. In the example shown, this arrangement of projections comprises six projections or ribs defining a substantially hexagonal pattern. These tabs or ribs provide stiffening in the access cover, as well as preventing the access cover 604 from supporting the wrong cartridge.

[0188] The projection system on the filter cartridge typically includes at least one radially outwardly convex portion. This convex portion is typically located on a curve that does not correspond to a circle centered around the midpoint of the second end cap.

[0189] Typically, the protruding system on the serviceable filter cartridge includes at least one convexly radially inwardly directed portion (i.e., at least one concavewardly directed radially outwardly).

[0190] In the example shown, the projection system on the serviceable filter cartridge includes a plurality of radially outwardly convex portions and a plurality of radially inwardly convex portions, sometimes referred to as outwardly concave portions. In this particular example illustrated, these parts form a continuous serpentine wall. A particular example of a continuous serpentine wall, shown in the drawings, is a closed, continuous, solid wall, i.e.

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EP 2 175 960 B1 having no through holes and not hollow.

[0191] Typically, the protruding arrangement of the serviceable filter cartridge extends from the immediately adjacent area of ​​the second end cap to a distance of at least 10 mm, usually at least 15 mm, and often in the range of 20 to 40 mm inclusive.

[0192] Also typically, the projection system of the serviceable filter cartridge extends axially outwardly beyond the end of the working medium packet at a distance of at least 10 mm, usually at least 15 mm, and often in the range of 20 to 80 mm. This means that, in a typical arrangement, the protruding arrangement is not part of the deep internal cavity in the second end cap that projects into the insert.

[0193] In the example shown, the filter cartridge includes an axial centering ring on the outer surface of the closed end cap, surrounding and spaced from the projection on the closed end cap. The axial centering ring is positioned so that it centers and in some cases rests on the centering ring located on the inner surface of the access cover, surrounding and remote from the female arrangement on the access cover. The inner threshold of this ring in the access cover may be surrounded by an axial centering ring on the filter cartridge when installed.

[0194] Furthermore, according to the present disclosure, an air filter cartridge system is provided. The air filter element is used as a serviceable filter element in the air filter assembly. An example of an air filter cartridge (and corresponding air filter assembly) is described and shown.

[0195] Generally, the air filter cartridge includes a packet

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Working medium first and second medium package Working medium working but working.

it surrounding an open interior having the opposite end. As already mentioned, the working contains may be different filter medium. the types of factors will typically be a pleated factor [0196] The working medium package may also comprise one or both of the inner and outer working medium liner. Plastic and / or metal inserts would typically be used.

[0197] The working medium package may be configured in a cylindrical or conical shape.

[0198] The cartridge includes a first end cap disposed at the first end of the working medium packet. The first end cap has a through center air flow opening.

[0199] A seal is provided on the closed end cap. In the example shown, the first end cap has an inwardly directed radial seal surrounding the airflow passage. This radial seal may include an integrally formed portion of the end cap, although alternatives are possible. This first end cap is typically formed in place, for example from polyurethane foam.

0200] The second end cap is located at the second end of the working medium packet, opposite the first end cap. This second end cap is typically a closed end cap. The second end cap comprises which protrudes from the first, the protruding is non-circular and the arch section; at least the example shown, the one wearing a projecting arrangement, of the end cap. The system comprises at least one arc section has or

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EP 2 175 960 B1 defines an arcuate curve that is non-concurrent with the circle surrounding the midpoint of the end cap.

[0201] The at least one arcuate section may include a portion of a protruding system comprising a plurality of outwardly protruding convex parts, and inwardly convex sections, such as alternating serpentine systems. This serpentine system may comprise a single continuous wall around the center of the end cap.

[0202] The second end cap of the cartridge may further include an axial centering ring on its outer surface. This axial centering ring is generally arranged so that it surrounds and is radially spaced from the projection on the second end cap. This ring is positioned to align with the axial centering ring on the access cover when the cartridge is installed correctly.

[0203] There is no particular requirement that the system contain all the specific features described and illustrated in connection with the example set forth herein, unless otherwise indicated. The system may contain only selected some of the features characterized herein and the benefits of the present disclosure can still be obtained.

Donaldson Company, Inc.

Proxy:

76P34041PL00

EP 2 175 960 B1