Engine generator

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to an engine generator in which the entire device is covered with a sound insulating case.

【0002】

[Conventional technology]

An engine generator that integrates a generator driven by an engine with an engine is generally used at construction sites, etc., but due to consideration for the work environment or the area around the site, especially when driving at night in urban areas, the driving noise is heard. In order to keep it as low as possible, a device in which the entire device is covered with a sound insulation case is widely used.

【0003】

As described above, in this type of engine generator, the openings such as the intake port and the exhaust port are made as small and small as possible in order to pursue quietness, but on the other hand, since the opening area is small, the inside of the sound insulation case Careful consideration must be given to cooling.

【0004】

Therefore, the applicant has proposed an example described in Japanese Patent Publication No. 64-3777, etc. relating to the previous application. In this example, the engine and muffler are covered with a duct to separate them from other equipment. By forcibly ventilating the cooling air into the duct and exhausting the air from the muffler side to the outside of the sound insulation case, it is possible to prevent the high temperature cooling exhaust air from recirculating inside the sound insulation case.

【0005】

[Problems to be Solved by the Invention]

However, for the generator inside the sound insulation case and outside the duct, it is necessary to take measures such as configuring a cooling air passage different from the duct or preparing a cooling fan dedicated to the generator. It was one of the factors for the increase in size.

【0006】

In the example described in Japanese Patent Publication No. 64-3777, a fan for cooling the generator is provided separately from the cooling fan forcibly ventilating the duct covering the engine and the muffler, and the exhaust air from the fan joins the duct. It cannot be said that the cooling system is very efficient with the problem that it cannot be merged unless the exhaust pressure is high to some extent.

【0007】

The present invention has been made in view of this point, and an object of the present invention is to provide a compact engine generator capable of obtaining a high sound insulation effect and efficiently cooling a generator together with an engine and a muffler. It is in.

【0008】

[Means and effects for solving problems]

In order to achieve the above object, the present invention includes an engine, an engine, and a muffler in an engine generator in which an engine and a generator driven by the engine are arranged side by side in the rotation axis direction and housed in a sound insulation case. By arranging them in order and covering them with ducts, they are separated from other equipment in the sound insulation case, the generator side end of the duct is opened inside the sound insulation case, and the muffler side end of the duct is outside the sound insulation case. The air in the sound insulation case is sucked into the duct from the generator side opening of the duct by the cooling fan driven by the engine, and the generator, the engine, and the muffler are cooled in order, and then the above. The engine generator is configured to be discharged to the outside through the opening on the muffler side of the duct.

【0009】

The generator, engine, and muffler are arranged in this order and covered with a duct to separate them from other equipment. The air inside the sound insulation case is sucked into the duct through the opening on the generator side of the duct, and the generator with a relatively low temperature comes first. After cooling, the engine and muffler with high temperature are cooled in order and discharged to the outside from the opening on the muffler side, so that the engine and muffler are efficiently cooled together with the generator.

【0010】

The engine is doubly covered with a duct and a sound insulation case to obtain a high sound insulation effect. The duct may have a generator, an engine, and a muffler arranged in this order, and can be bent in an L shape so that the space can be efficiently used and arranged in the sound insulation case, resulting in compactness. ..

【0011】

The invention according to claim 2 comprises the engine generator according to claim 1, wherein the generator is an outer rotor type generator including an outer rotor that also serves as a fly wheel of the engine, and the cooling fan is the duct. It is characterized in that it is integrally provided with the outer rotor of the generator within the opening on the generator side of the above.

【0012】

By using the outer rotor of the generator as the flywheel of the engine, the dimensions in the direction of the rotation axis can be reduced, and since the cooling fan is integrally attached to the outer rotor, it is easy to attach a cooling fan with a large air volume. It is possible to obtain a large fan support strength.

【0013】

According to the third aspect of the present invention, in the engine generator according to the first or second aspect, the engine is arranged with the cylinder tilted diagonally sideways, and the muffler is arranged in the space above the cylinder. It is characterized by that.

【0014】

Since a large muffler can be placed in the space above the engine created by tilting the cylinder, the dimensions in the direction of the rotation axis can be reduced and the dimensions in the vertical direction can be kept as small as possible, and the device can be miniaturized. Since the higher heat part is located above, a rational cooling air flow can be formed and cooling can be performed efficiently.

【0015】

The invention according to claim 4 is characterized in that, in the engine generator according to claim 3, the muffler is arranged in a long length in a direction perpendicular to the rotation axis of the engine. A muffler with a large capacity can be arranged in the space above the inclined cylinder while keeping the vertical dimension of the device small.

【0016】

The invention according to claim 5 comprises the engine generator according to any one of claims 2 and 3 and claim 5, wherein the generator is an outer rotor type multi-pole generator having a magnet rotor. A control circuit for converting the output of the generator into alternating current having a predetermined frequency is provided.

【0017】

The generator is an outer rotor type multi-pole generator with a magnet rotor, and this output is converted to alternating current of a predetermined frequency by a control circuit such as an inverter, so the dimensions in the rotation axis direction of the generator can be kept smaller and at the same time. It is possible to reduce the number of revolutions except when the load is heavy, and the driving noise can be greatly reduced.

【0018】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment according to the present invention will be illustrated and described with reference to FIGS. 1 to 7. The engine generator 1 of the present embodiment has a cubic shape in which the entire device is covered with a sound insulation case 2 as shown in the external view in FIG.

【0019】

Figure 2 shows an exploded perspective view of the sound insulation case 2 and other internal frames. In the flat saucer-shaped underframe 3, the front side wall 3a and the right side wall 3b are formed with intake ports 4a and 4b that communicate with the outside, the rear side wall 3c is removable, and the inside is long front and rear in the left-right direction. A pair of support members 3p and 3q are laid parallel to each other.

【0020】

The front frame 5 and the rear frame 6 having a substantially rectangular plate shape are erected on the under frame 3 so as to face each other at a predetermined distance. In the front frame 5, the upper peripheral edge is bent rearward to form a flange 5a, and a rectangular opening 5b that is long in the left-right direction is formed in the upper part of the rectangular plate, and a part of a circle is bulged in the lower part. An opening 5c is formed.

【0021】

On the other hand, when the rear frame 6 is divided into upper and lower parts, a large rectangular through hole 7a is formed in the center, and a duct 7 that bulges forward is integrally formed in the through hole 7a, and the upper side of the rear frame 6 is formed. The peripheral edge is bent forward to form a flange 6a. The front portion of the duct 7 has a rectangular tubular shape and is open.

【0022】

A glass wool duct 8 is provided behind the rear frame 6 so as to be provided in the through hole 7a and connected to the duct 7 so as to bulge rearward. The duct 8 has a substantially rectangular box shape with front and lower openings, and an exhaust port 8a is provided on the upper side wall.

【0023】

A pair of left and right reinforcing rails 9 and 9 oriented in the front-rear direction are erected between the front and rear front frames 5 and the rear frame 6 erected on the underframe 3 through the upper corners. A half-width tubular center cover 11 covers the front and rear front frame 5 and the rear frame 6 reinforced in this way along the outer peripheral edge so as to partition the facing spaces from the outside.

【0024】

The center cover 11 has a half-width tubular shape of the left side wall 11a, the upper wall 11b, and the upper right side wall 11c by bending the plate, and the lower right side wall is covered with a lid member 12 that can be opened and closed, which is a separate member. A center room 22 is formed inside. A circular hole 11d is formed on the upper wall of the center cover 11 from which the fuel filler port 55b of the fuel tank 55 protrudes.

【0025】

Then, the front cover 13 having a substantially rectangular box shape is put on the front of the front frame 5 to form a section of the front chamber 21, and the rear cover 14 having a substantially rectangular box shape is put on the rear of the rear frame 6 to divide the rear chamber 23. Although it is formed, the structure is such that the glass wool duct 8 is lined along the inner surface of the rear cover 14, and the inside of the duct 8 is the rear chamber 23.

【0026】

The center of the front wall of the front cover 13 is formed with a rectangular opening 13a for the control panel 62 which is recessed and opened in a rectangular shape, and the upper wall of the rear cover 14 is a rectangular opening 14a corresponding to the exhaust port 8a provided in the duct 8. Is formed.

【0027】

As described above, the sound insulation case 2 forming the outer wall of the engine generator 1 is composed of six surfaces formed by an underframe 3, a center cover 11, a lid member 12, a front cover 13, and a rear cover 14. The internal space of the sound insulation case 2 is divided into three rooms, a front room 21, a center room 22, and a rear room 23, by a front frame 5 and a rear frame 6.

【0028】

A fan cover 16 which is also a duct is continuously installed in the center chamber 22 in the rectangular tubular portion of the duct 7 which bulges from the rear frame 6 into the center chamber 22. The fan cover 16 has a substantially cylindrical shape to cover the generator 35 and the centrifugal fan 40, the circular opening at the front end forms the air intake 16a, and the annular opening end surface of the air intake 16a has a plurality of protrusions 16b having a constant protrusion length. It is provided.

【0029】

A flange 16c extending in the outer peripheral direction is formed on the rear end opening surface of the fan cover 16, and a rectangular frame member 17 is attached to the flange 16c from the rear. A seal rubber 18 is provided around the outer peripheral edge of the rectangle of the rectangular frame member 17, and the rectangular frame member 17 is fitted by sealing the periphery with the seal rubber 18 in the rectangular tubular portion of the duct 7.

【0030】

That is, the fan cover 16 is connected to the duct 7 of the rear frame 6 via the rectangular frame member 17, and the duct 7 is connected to the duct 8 that bulges rearward from the rear frame 6 to form the rear chamber 23.

【0031】

Therefore, in the sound insulation case 2, a duct inner space consisting of a fan cover 16, a duct 7, and a duct 8 is formed by occupying a part of the center chamber 22 and the rear chamber 23, and sucks upstream of the duct inner space. The air vent 16a opens in the center chamber 22, the downstream exhaust port 8a is provided on the upper side wall of the duct 8, and the air vent 8a faces the rectangular port 14a of the rear cover 14 and opens to the outside of the sound insulation case 2. ing.

【0032】

Various devices are arranged in the frame structure and duct structure in the sound insulation case 2 as described above. As shown in FIG. 4, the engine 30 is housed in ducts 7 and 8 at the rear of the sound insulation case 2, and is supported by a pair of left and right anti-vibration mount members 31 fixed to a support member 3q laid on the underframe 3. (See Figures 4 and 6).

【0033】

As shown in FIG. 6, in the engine 30, the crankcase 30a is biased to the left side, the cylinder 30b is tilted slightly upward to the right, and the crankshaft 30c oriented horizontally in the front-rear direction is forward. It protrudes to.

【0034】

Since the cylinder 30b of the engine 30 is tilted in this way, a large space above the ducts 7 and 8 can be secured, and a large tubular muffler 32 is arranged in the same space so as to be directed in the left-right direction. The muffler 32 is supported by the engine 30 via the bracket 33, the exhaust pipe 34 extending upward from the cylinder 30b is connected, and the tail pipe 32a extending from the right wall of the muffler 32 wraps around the rear surface of the muffler 32. The exhaust port is aligned with the exhaust port 8a.

【0035】

A generator 35 is provided on a crankshaft 30c protruding forward from the crankcase 30a. The generator 35 is an outer rotor type multi-pole generator. As shown in FIG. 7, the outer rotor 36 integrally fixed to the crankshaft 30c has a bottomed cylindrical shape, and a magnet 36a is formed on the inner peripheral surface of the peripheral wall. Is attached over multiple circumferential directions and rotates integrally with the crankshaft 30c, which also acts as a flywheel in the engine.

【0036】

The outer rotor 36 opens to the rear with the bottom wall facing the front side, and the inner stator 37 inside has a stator core in which a power generation coil is wound around a plurality of yokes protruding radially and is fixed to the crankcase 30a. A plurality of vents 36b are formed on the bottom wall of the outer rotor 36. A centrifugal fan 40 is fixed to the bottom wall of the outer rotor 36 from the front.

【0037】

The centrifugal fan 40 is a double-sided fan in which fans 41 and 42 are formed on both front and rear surfaces of the disc-shaped base 40a. The fan cover 16 covers the generator 35 and the centrifugal fan 40, and the air intake port 16a at the front end opens facing the centrifugal fan 40, and the rear end is connected to the crankcase 30a of the engine 30 together with the rectangular frame member 17. It is fixed and supported.

【0038】

A recoil starter 45 is provided so as to face the front end air inlet 16a of the fan cover 16. The recoil starter 45 is arranged at a predetermined distance from the end face of the fan cover 16 by a protrusion 16b protruding from the open end face of the air inlet 16a of the fan cover 16, and the boss portion 46b of the starter case 46 is fixed to the fan cover 16. It is supported as one.

【0039】

In the recoil starter 45, the ratchet wheel 47 is provided on the rotating shaft coaxial with the crankshaft 30c so that the ratchet wheel 47 can protrude rearward with reference to FIG. 3, and the central portion of the centrifugal fan 40 faces the ratchet wheel 47. Ratchet 48 is attached to.

【0040】

The ratchet wheel 47 is driven by the starter lever via the gear train 47a, and is also driven by the starter motor 49 provided at the left end of the starter case 46.

【0041】

When the ratchet wheel 47, which is normally separated from the ratchet 48, is driven by the starter motor 49 or the like, it jumps out to the rear and engages with the ratchet 48 to force the integrated crankshaft 30c via the ratchet 48 and the outer rotor 36. It can rotate to start the engine 30.

【0042】

The starter case 46 having a substantially conical shape of the recoil starter 45 has a plurality of elongated holes 46a along the bus line formed in the circumferential direction, and together with the gap between the end face of the fan cover 16 and the outside of the starter case 46. It communicates with the air inlet 16a of the fan cover 16.

【0043】

The recoil starter 45 is supported by a pair of left and right anti-vibration mount members 50 in the center chamber 22 and fixed to a support member 3p laid on the underframe 3 (see FIGS. 4 and 5).

【0044】

The engine 30 and the recoil starter 45 are integrally connected via a fan cover 16, the rear engine 30 is supported by the anti-vibration mount member 31, and the front recoil starter 45 is supported by the anti-vibration mount member 50. Therefore, the positions close to both front and rear ends of the vibrating body can be effectively supported.

【0045】

Since the generator 35 and the recoil starter 45 are arranged in front of the crankcase 30a located to the left from the rear chamber 23 to the center chamber 22, there is a space to the right of the fan cover 16 and the recoil starter 45 in the center chamber 22. The vaporizer 52 and the air cleaner 53 are arranged in the same space in the front and rear with the air cleaner 53 on the front side.

【0046】

The muffler 32 is arranged above the engine 30, but the fuel tank 55 is arranged in the space above the fan cover 16, the recoil starter 45, the carburetor 52, and the air cleaner 53 in the center chamber 22.

【0047】

The flange 55a of the fuel tank 55 is fixed to the pair of left and right reinforcing rails 9 erected between the front frame 5 and the rear frame 6 with bolts 57 via the anti-vibration rubber 56, and the fuel tank 55 is suspended.

【0048】

The fuel tank 55 partially protrudes into the front chamber 21 from the upper opening 5b of the front frame 5, and the fuel filler port 55b protruding upward from the fuel tank 55 penetrates the circular hole 11d of the center cover 11 to the upper end. The fuel cap 58 is screwed.

【0049】

Therefore, the fuel tank 55 is arranged together with the intake system equipment of the carburetor 52 and the air cleaner 53 in the external space of the fan cover 16 and the duct 7 in the center chamber 22, and the fuel system parts of the engine 30 are centralized collectively. The space is used efficiently, and the equipment is made compact.

【0050】

In the flat rectangular space of the front chamber 21 covered by the front cover 13 in front of the front frame 5, the inverter device 60 is arranged on the right side, the battery 61 is arranged on the underframe 3 on the left side, and the control panel 62 is located above the underframe 3. It is provided facing the front rectangular opening 13a of the cover 13. That is, electrical equipment is centrally arranged in the front chamber 21.

【0051】

The inverter device 60 converts the power generation output of the multi-pole generator 35 into alternating current of a predetermined frequency, and the inverter device 60 is arranged on the right side of the front cover 13 of the front chamber 21 near the intake ports 4a and 4b. It is designed to be cooled first by the inhaled outside air.

【0052】

The engine generator 1 provided with the sound insulation case 2 has a structure in which the generator 35, the engine 30, and the muffler 32 are housed in the ducts 7 and 8 and the fan cover 16 in this order as described above.

【0053】

The air intake 16a of the fan cover 16 opens in the center chamber 22, and the air introduced into the center chamber 22 from the outside of the sound insulation case 2 via the front chamber 21 by the rotation of the centrifugal fan 40 provided inside the air intake 16a is introduced. Air can be sucked into the fan cover 16 from the air inlet 16a through the plurality of elongated holes 46b of the starter case 46 of the recoil starter 45 and the gap between the fan cover 16 and the starter case 46 (in FIGS. 4 and 7). The flow is indicated by a broken arrow).

【0054】

As shown in FIG. 7, air is sucked into the fan cover 16 from the air inlet 16a by the fan 41 provided on the front surface of the centrifugal fan 40, and the sucked air is taken into the generator 35 along the inner peripheral surface of the fan cover 16. The outside of the outer rotor 36 flows to the engine 30 side to cool the engine 30, but a part of the air flow to the engine side due to the action of the fan 42 on the rear surface of the centrifugal fan 40 is between the generator 35 and the engine 30. It goes around to the inside of the outer rotor 36 through the gap of the outer rotor 36 to cool the power generation coil and circulates through the vent 36b provided on the bottom wall of the outer rotor 36.

【0055】

The air that has flowed to the engine 30 including the air that partially cooled the generator 35 cools the engine 30 and is guided by the ducts 7 and 8 to cool the muffler 32 upward (see FIG. 4). The air that has cooled the muffler 32 is discharged to the outside from the air exhaust port 8a that is above the muffler 32 and is provided so as to face the outside of the sound insulation case 2.

【0056】

Since the center chamber 22 is designed so that outside air is sucked from the intake ports 4a and 4b of the front cover 13 through the front chamber 21 which is in a communicating state by the communication opening 5c of the front frame 5, the front chamber 21 Acts as a labyrinthine introduction duct for inhaling outside air, can suppress the leakage of intake noise generated in the center chamber 22, and cools the inverter device 60 in the path of the intake air flow from the intake ports 4a and 4b. can do.

【0057】

Then, the fan cover 16, the ducts 7 and 8 covered the generator 35, the engine 30 and the muffler 32 as heat sources to separate them from other equipment, and opened in the center chamber 22 by the drive of the centrifugal fan 40 as described above. The air sucked into the fan cover 16 from the air inlet 16a is cooled in the order of the generator 35, which has a relatively low temperature, the engine 30 and the muffler 32, which have a high temperature, and is discharged to the outside from the air outlet 8a. Good cooling can be done.

【0058】

Since the centrifugal fan 40 is attached to the outer rotor 36 of the generator 30, it is possible to easily attach the centrifugal fan 40 having a large air volume and obtain a large fan support strength.

【0059】

Further, since the muffler 32 is arranged above the engine 30, the higher the heat equipment is, the higher the muffler 32 is, and the exhaust port 8a is provided above the muffler 32, a rational cooling air flow can be formed and cooling can be performed efficiently.

【0060】

It has a simple ventilation structure in which the generator 35, engine 30, and muffler 32 are covered in this order by the fan cover 16, ducts 7, and 8. The engine 30, the muffler 32 is placed behind the generator 35, and the duct 7 is placed above the engine 30. Since the ventilation passages of, 8 are bent in an L shape, the dimensions of the sound insulation case 2 in the front-rear direction can be reduced, and the space inside the sound insulation case 2 can be efficiently used to place other equipment. The entire engine generator 1 can be made compact.

【0061】

Further, since the generator 35 is an outer rotor type generator and the outer rotor 36 also serves as the flywheel of the engine 30, it is not necessary to separately provide a flywheel and the dimensions in the rotation axis direction (front-rear direction) are reduced. Further, since the inverter device 60 converts the output of the multi-pole generator 35 into alternating current of a predetermined frequency, the dimension of the generator itself in the rotation axis direction can be reduced.

【0062】

In addition, since the cylinder 30b of the engine 30 is tilted sideways and the muffler 32 is arranged above the cylinder 30b, it is possible to keep the vertical dimension small while arranging the muffler 32 having a large capacity.

【0063】

The engine 30, which is a noise source, is covered with a duct composed of a duct 7 and a duct 8 made of glass wool, and has a double shielding structure in which a sound insulation case 2 covers the outside thereof, so that a high sound insulation effect can be obtained.

【0064】

In addition, since the inverter device 60 converts the output of the multi-pole generator 35 into alternating current of a predetermined frequency, the load is increased in order to keep the output frequency constant like the synchronous generator used in the conventional engine generator of this type. It is not necessary to keep the rotation speed constant regardless of the size, and it is possible to reduce the rotation speed except when the load is large, and the driving noise can be significantly reduced.

[Simple explanation of drawings]

[Figure 1]

It is an external view of the engine generator which concerns on one Embodiment of this invention.

[Figure 2]

It is an exploded perspective view of a sound insulation case and other internal frames.

[Fig. 3]

It is a top view of the engine generator in the state where the center cover is removed and the fuel tank is omitted.

[Fig. 4]

It is the side view of the engine generator which partially omitted.

[Fig. 5]

It is the same front view.

[Fig. 6]

It is the same rear view.

[Fig. 7]

It is a side view which made it a partial cross section of a generator and its vicinity.

[Explanation of symbols]

1 ... engine generator, 2 ... sound insulation case, 3 ... underframe, 4a, 4b ... intake port, 5 ... front frame, 6 ... rear frame, 7,8 .. .Duct, 9 ... Reinforcing rail, 11 ... Center cover, 12 ... Lid member, 13 ... Front cover, 14 ... Rear cover, 16 ... Fan cover, 17 ... Rectangular frame Parts, 18 ... Seal rubber, 21 ... Front room, 22 ... Center room, 23 ... Rear room, 30 ... Engine, 31 ... Anti-vibration mount members, 32 ... Muffler , 33 ... bracket, 34 ... exhaust pipe, 35 ... generator, 36 ... outer rotor, 37 ... inner stator, 40 ... centrifugal fan, 41,42 ... fan, 45 ... Recoil Starter, 46 ... Starter Case, 47 ... Ratchet Wheel, 48 ... Ratchet, 49 ... Starter Motor, 50 ... Anti-Vibration Mount Member, 52 ... Vaporizer, 53 ... air cleaner, 55 ... fuel tank, 56 ... anti-vibration rubber, 57 ... bolt, 58 ... fuel cap, 60 ... inverter device, 61 ... battery, 62 .. .Control panel.