Hydraulic tractor-cab suspension apparatus

[Detailed Description of the Invention]

The present invention relates to the hydraulic type suspension and the rise downward cylinder device with which it was equipped fully for [ which can incline ] tractor A cab of the engine upper part. The tractor portion of tractor trailer combination is designed in track industry to often construct the A cab across the upper part of a tractor engine and a gearbox. Or -- especially a design [ like ] makes full length of a whole device the minimum, and it is used by it, spreading generally. Or -- in order to maintain and/or fix the engine of a tractor design [ like ], A cab inclines toward the upper part front and exposes an engine and a drive. Or -- at least one example of a device [ like ] can be seen by referring to the U.S. Pat. No. 3761123 specification of Neil Mr. others (Neill et al) by the same applicant as this application. In this patented design, in order to make A cab incline in an inclination position from the horizontal position of normal operation as shown in Drawing 1 of this patent, the hydraulic cylinder is used. In order to buffer and hang A cab to a tractor chassis during run operation on a normal road, each corner of A cab is preferably supported by combination of a hydraulic cylinder and a spring. This is common knowledge as perfect suspension A cab. A cab suspension -- an operation member -- it is very desirable in order to be comfortable -- although kicked -- Or -- a device [ like ] has some faults. About it, suspension A cab tends to roll to the side, when turning. In the same character, suspension A cab "drives" ("drive") ahead, also when tractor brakes are applied. [ tend ] When the single inclination cylinder is used for the 1 side of A cab, it may permit that the suspension system is greatly twisted in A cab during a rise or downward operation. if -- A cab -- Or -- in a use condition [ like ] -- a front part suspension cylinder -- therefore, if it does not incline, A cab may damage the circumference parts of tractor engines, such as a radiator. Difficulty shown above is in many rather, although all are not considered. They have the tendency to reduce suspension of the conventional tractor A cab, and the validity of a tipper. Although it thinks that other remarkable problems also exist, probably, the fault shown above will be enough to prove that the tractor suspension and the tipper which appeared conventionally need a considerable improvement. It will be desirable to form the full suspension and the tipper of inclination A cab which make the minimum the damage tendency by the twist operation of A cab, when A cab inclines ahead to a tractor engine or it returns back. In addition, probably, it will be desirable to provide the Complete device which reaches the suspension and rolling which were emphasized and has the characteristic of a pitch. Therefore, it is the general object of the present invention to provide the inclination A cab full equipment suspension and the tipper which make the problem of the kind described until now removal and/or the minimum. It is a special purpose of the present invention to provide the inclination A cab full equipment suspension and the tipper which made the minimum the tendency for A cab to roll around the vertical axis of A cab. It is other objects of the present invention to provide the inclination A cab full equipment suspension and the tipper which make the minimum the tendency for A cab to pitch a "drive" or ahead during brake operation of a tractor. Even when a single inclination cylinder is used, it is other objects of the present invention that the rise of A cab and the twist inclination of A cab of downward moving appearance in the work provide the inclination A cab full equipment suspension and the tipper which become the minimum. The inclination A cab full equipment suspension and the tipper by the desirable example of the present invention can be constructed across on a chassis or a frame, and this chassis, and can be constructed across advantageous on the It was tractor which has pivotal A cab in the surroundings of a certain axis near a chassis front end part to a chassis. The suspension assembly object is constructed across between a chassis and A cab in each of the right and left of A cab, and the corner of order. The full equipment hydraulic gear of the present invention contains the 1st conduit device prolonged between the source of supply of the pressurized water pressure fluid, and the pressure accumulation machine of a suspension system and a hydraulic cylinder. 3 position control valve is constructed across downstream from a pressurized fluid source of supply, and feeds fluid alternatively from a A cab inclination cylinder and this cylinder through the 2nd water pressure conduit device. The 3rd water pressure conduit device feeds fluid into the 1st conduit device, in order to extend a suspension cylinder alternatively. Before, as for a front part suspension cylinder, A cab inclines in a A cab inclination cylinder at the time of operation, it fully extends. Therefore, A cab is twisted during a rise or downward operation, and is stabilized to an inclination. Full equipment suspension and the tipper of the present invention contain a double acting front part suspension cylinder (plurality) and the cross binding device formed between a push and pull end of a front part suspension cylinder (plurality) in order to make A cab rolling under normal run into the minimum. Other objects and advantages of the present invention will become clear by detailed explanation of the following which describes an accompanying drawing. If an accompanying drawing is referred to, the same parts are shown, tractor 10 is shown in Drawing 1, and the same number is this tractor, A chassis or frame 12, and ing that has pivotal A cab 14 to chassis 12 in front part pivotable support axis 16 in order to expose for maintaining engine 18 etc. The relative motion of A cab 14 to chassis 12 will be described in detail below, although it is controlled by hydraulic cylinder 20. Although illustration is not carried out, the operation of hydraulic cylinder 20 is controlled from the place constructed across on the chassis left distantly [ hydraulic cylinder / 20 / A cab 14 and ] typically. Therefore, a driver is in the place completely away from A cab 14 which is carrying out a drive, while operating hydraulic cylinder 20. Next, if Drawing 2 is seen, in order to show the position of various major parts of the full equipment device of the present invention, the imagining point shows the solid outside of pivotal tractor A cab 14. Therefore, the portion on the left-hand side of [ front part ] A cab shows that it is hung to a chassis with suspension assembly object 22 of person-skilled-in-the-art common knowledge form, and is carrying out the operation which buffers A cab relatively to a chassis during normal operation. The suspension system sketched by 22 has one hydraulic cylinder, and it is maintained with pressure accumulation machine 24 and a water pressure system device by a certain suspension pressure decided beforehand. Similarly, the front part right-hand side of A cab is relatively supported to a chassis with suspension cylinder 26 and pressure accumulation machine 28. Hind suspension contains the suspension cylinder of left-hand side 30 and right-hand side 32, and pressure accumulation machine 34 connected with both cylinders. It raises, and cylinder 20 is pivoted by the tractor chassis and is similarly pivoted in A cab which can be inclined in 38 in the end part 36. Drawing 3 shows A cab full equipment suspension of the present invention, and the hydraulic-pipe genealogy of a tipper. Suspension cylinders 22 and 26 of the right and left of the above-mentioned front part are related in each pressure accumulation machine 24 and 28, and are connected with hydraulic pipes 40 and 42 of the 1st conduit device 43, respectively. In the state relevant to it, suspension cylinders 30 and 32 of hind right and left are connected with pressure accumulation machine 34 through pipe 44. Hydraulic pipe 44 is also a part of 1st conduit device again. Cutoff valve 46 is located in pipe 40 between pressure accumulation machine 24 and suspension cylinder 22. Similarly, cutoff valve 48 is located in pipe 42 between pressure accumulation machine 28 and suspension cylinder 26, and pipe 44 between pressure accumulation machine 34 and rear suspension cylinders 30 and 32 is inserted in another cutoff valve 50. These cutoff valves are the things of a design usually, are connected with air valve 52 in operation through Then and pipe 51, and this air valve 52 acts by the brake cylinder of a tractor Bluff device. Therefore, if tractor Bluff is added, these cutoff valves will insulate those suspension cylinders from each pressure accumulation machine, and they will act so that a buffer action with a pressure accumulation machine may be made to finish. During brake operation, a cutoff valve acts in operation so that A cab may prevent "being devoted" ("diving") or pitching (pitching) to the front to a chassis. Buffer cylinders 22 and 26 of the right and left of the front part, Preferably it is mutually connected by Then and intersection lead pipes 53 and 54 in water pressure by the double acting hydraulic cylinder, and they are these intersection lead pipes, The push end of cylinder 22 is connected with the pull end of cylinder 26, and the push end of cylinder 26 is connected with the pull end of cylinder 22, respectively. The high-speed rolling rigidity of A cab suspension is acquired as a result of this connection of the oil chamber of both cylinders. The source of supply of water pressure fluid is sketched by 56, and it comprises Reservoir 57, pump 58, and motor 60. A water pressure fluid source of supply is sent out to 3 position control valve 62 like operation of pressurized fluid from Reservoir. ing in which three positions of valve 62 have 2nd downward position B and 3rd running position C in 1st ascending position A. The position of a rise and descent is mainly used, in order to feed pressurized fluid at push end 64 and pull end 66 of inclination cylinder 20 during a A cab inclination and return operation with the 2nd conduit device 68. The 3rd conduit device 70 mainly operates in operational status, in order to extend from 3 position control valve 62 and to feed pressurization water pressure fluid into a suspension system. equalization valves 74 and 76 respectively relevant to [ more particularly ] the suspension cylinder of the front part and the rear in pressure pipe 72 of this 3rd conduit device -- a connoisseur -- intermediary water pressure fluid is fed. In the lower stream of this equalization valve 74, the 3rd conduit device feeds water pressure fluid into balanced valve 80 through lead pipes 82 and 84 at the 1st conduit device 43 and pipes 40 and 42 through pipe 78 further. Equalization valve 74 corrects the Static pressure deflection of A cab in operation, and a balanced valve acts so that the Static pressure deflection over the suspension cylinder of the right and the left may be equally maintained during correction operation of an equalization valve. In the almost same state, equalization valve 76 is located between hind suspension cylinder 30 and 32. Equalization valves 74 and 76 are mechanically connected with the rolling axis of A cab, or the point (plurality) of the neighborhood. Therefore, probably, those valves do not follow rolling movement of A cab. The water pressure pressure accumulation machine device of the present invention other than each suspension cylinder pressure accumulation machines 24 and 28 and double cylinder pressure accumulation machine 34 contains the parents located in pressure pipe 72 of the 3rd conduit device, or the main water pressure pressure accumulation machines 90. The water pressure fluid of a certain quantity in a pressurization state is stored, and this pressurized fluid can be immediately supplied according to the demand by an equalization valve, and this parent pressure accumulation machine 90 can compensate the internal disclosure in a device. The pressure in this main pressure accumulation machine is controlled by one pair of pressure switches 92 and 94 set to respectively comparatively high pressure and comparatively low pressure in operation between a certain comparatively high full limits and comparatively low full limits. Electronic control circuit 96 is connected to these pressure switches and motor 60. If it descends from full limits with low pressure in the main pressure accumulation machine, electric motor 60 is started, and a pressure accumulation machine will be again pressurized until it reaches high full limits. The 3rd water pressure conduit device 70 contains return pipe 73 again. Bypass lead pipe 100 has been arranged around equalization valve 74, and, on the other hand, has closed this valve in the return direction of water pressure fluid normally including nonreturn valve 102. Next, operation of this device is explained. Water pressure fluid is continuously fed into a suspension system through 72, such as pressure, by parent pressure accumulation machine pressure perception and an automatic pumping plant. The pressurized water pressure fluid is continuously added through the balanced valve between front part cylinders through the equalization valve to a suspension cylinder. This pressurized fluid is fed by the 3rd conduit device between pressure accumulation machines 24, 28, and 34 and the suspension cylinder of relation. the fully pressurized pressure accumulation machine relevant to those cylinders -- therefore, during normal operation operation, it acts so that the suspension buffered to A cab may be provided. In tractor Bluff being added and cooking, a cutoff valve (plurality) secedes from a pressure accumulation machine (plurality) automatically from a suspension system, and A cab makes it possible an excessive front pitch or to brake, without being devoted and causing operation. Suspension cylinders 22 and 26 of the right and left of the front part are formed in a double acting type, the cross binding of a push and the water pressure chamber of pull is carried out in fluid, and the ratio of the Rod diameter of those cylinders and a cylinder bore is suitably chosen so that the advanced rolling rigidity for A cab suspension may be acquired. the time of wanting, if I will maintain vehicles and I will incline A cab ahead -- a tractor and an urgent brake -- in addition -- therefore, cutoff valves 46, 48, and 50 are operated, and a suspension cylinder (plurality) is separated from each pressure accumulation machine. Valve 62 is placed on A position, pressurization water pressure fluid is fed by return pipe 73, and results in front part suspension cylinders 22 and 26 through bypass lead pipes 100 and 102, and begins to press a cylinder in the position which fully extended. It raises, the push end of cylinder 20 is pressurized through pilot operation nonreturn valve 99, and tractor A cab inclines ahead. During this inclination operation of A cab, probably, A cab does not incline too much, even when the single inclination cylinder is arranged at the 1 side of a tractor, since it is fully held in the extended suspension cylinder. Therefore, the tractor engine part article of the circumferences, such as a radiator, does not carry out interference contact with the inside of A cab during this inclination operation. The same state is performed also at the time of descent of A cab when a valve is put on B position. One desirable example was referred to in explanation of the present invention. The person skilled in the art will recognize the advantage of shoes to be indicated clearly and in peculiar by this example. It is not necessary to describe many all advantages of the present invention in detail, and especially a remarkable point is offer of a perfect inclination cylinder and a water pressure suspension system which uses the single source of supply of pressurization water pressure fluid. The cross binding is carried out in order to give the rolling stability of a certain grade which a water pressure chamber is [ as opposed to / at a double acting type / to Then / in the suspension cylinder (plurality) of the front part / A cab ] under [ run operation ] receiving. During brake operation, a suspension cylinder (plurality) is automatically insulated from a free passage state with the related pressure accumulation machine, A cab is devoted, and operation is made into the minimum. Moreover, it extends enough in operation before inclination operation of A cab, A cab inclines timidly, and front part suspension cylinders 22 and 26 can make the minimum a possibility of damaging engine device circumference members, such as a radiator. In explanation of the present invention, although one desirable example was referred to, the person skilled in the art detailed by the contents of the present invention can recognize many additions in the gist of the present invention as shown in the attached claim, deletion, correction, substitution, and/or other change.

[Brief Description of the Drawings]

The side view of a tractor which has inclination A cab in which Drawing 1 has an operating state of the present invention, and Drawing 2 show general arrangement with the suspension assembly object of the right and left of Then, the front part, and the rear, and a A cab inclination cylinder with the solid schematic illustration of inclination A cab shown in Drawing 1, and Drawing 3 is a schematic illustration of a hydraulic-pipe system of the present invention. 10 ... tractor, 12 ... chassis, 14 ... A cab, 16 ... front part pivotable support axis, 18 ... An engine, 20 ... It raises and is a cylinder, and 22, 26, 30 and 32... Suspension cylinder, 24, 28, 34, 90 ... A pressure accumulation machine, 36, 38 ... A pivot part, 40, 42, 44 ... Hydraulic pipe, 43 ... the 1st conduit device, and 46 and 48, 50 ... cutoff valve, 52 ... brake air valve, 53, 54 ... An intersection lead pipe, 56 ... The source of water pressure fluid, 57 ... Reservoir, 58 ... pump, 60 ... motor, 62 ... 3 position control valve, 64 ... the push side, 66 ... the pull side, 68 ... the 2nd conduit device, 70 ... the 3rd conduit device, 72 ... pressure pipe, 73 ... a return pipe and 74, 76 ... an equalization valve, and 78 and 82, 84 ... lead pipe, 80 ... a balanced valve and 92, 94 ... pressure switch, 96 ... electronic control circuit, 99 ... pilot operation nonreturn valve, 100 ... bypass lead pipe, 102 ... nonreturn valve.