JP2002180842A - Sound insulation type engine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability of start and stop of an engine. SOLUTION: A sound insulation case 10 for housing the engine 43 has a front face part, a back face part, left and right side face parts 13 and 14, a bottom face part 15 and an upper face part 16, and is formed into a nearly rectangular solid shape as a whole. The engine 43 is so disposed in the sound insulation case 10 as to orient its crankshaft 44 in the widthwise direction of the sound insulation case 10. A generating body 60 and a recoil starter 51 are connected to the crankshaft 44, and the recoil starter 51 is disposed between the generating body 60 and the engine 43. A recoil knob is attached to the tip of a recoil rope 53 wound around a recoil pulley 54 of the recoil starter 51, and disposed in the front face part of the sound insulation case 10. A control panel is installed in the front face part, so that an operator can start and stop the engine from the front side of the sound insulation case 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof engine generator in which a power generator and an engine for driving the power generator are housed in a soundproof case.

[0002]

2. Description of the Related Art In order to reduce engine noise transmitted to the outside, many engine generators are of a type in which an engine and a generator driven by the engine are housed in a soundproof case. Examples of the generator include those disclosed in Japanese Utility Model Laid-Open No. 61-66631 and Japanese Patent Laid-Open No. 11-200861. The soundproof case that houses the engine and the power generator has a substantially rectangular parallelepiped shape, and the engine housed in the soundproof case is arranged vertically so that the crankshaft faces the longitudinal direction of the soundproof case, that is, the full length direction. Is common.

[0003]

On the upper surface of the soundproof case, a rod-shaped handle operated when carrying the engine generator is provided so as to extend in the longitudinal direction of the soundproof case. If the engine is placed vertically in the soundproof case with the crankshaft facing in the longitudinal direction, the engine cannot be placed in the center of the soundproof case in the longitudinal direction. In the width direction, and to one side in the width direction. If the center of gravity is offset, the weight balance of the soundproof case will be poor when carrying the engine generator with the handle in hand,
Poor portability.

In addition, if the air cleaner is arranged in the direction of extension of the crankshaft when the engine is installed vertically in the soundproof case, the length of the soundproof case becomes large. The soundproof case must be arranged on the radial extension of the shaft, which increases the width of the soundproof case. For this reason, when the engine is installed vertically as in the case of the conventional engine generator, the width of the engine generator becomes large, and the operability of carrying work by grasping the handle is deteriorated.

[0005] One end of the soundproof case is on the front side, and an operation panel is provided on the front side. The operation panel is provided with an engine switch and an outlet as an AC power output terminal for supplying generated power to the outside. When the engine is installed vertically as in the past, the recoil knob of the recoil starter for starting the engine will be placed on the side of the soundproof case,
At start-up, the operator has two front and side sides of the soundproof case.
Operation on the surface.

An object of the present invention is to improve the operability of starting and stopping an engine.

[0007]

According to the present invention, there is provided an engine generator having a substantially rectangular parallelepiped soundproof case having both end portions, both side portions, a bottom portion and a top surface, and a crankshaft extending in a width direction of the soundproof case. An engine arranged in the soundproof case, a generator arranged in the soundproof case such that a rotation center axis of a rotor connected to the crankshaft is in a width direction of the soundproof case, and the generator, A recoil starter disposed between the engine and the crankshaft; and a recoil knob disposed on one of the end faces and attached to a tip of a recoil rope wound around the recoil starter. I do.

In the present invention, the engine is arranged in the soundproof case so that the crankshaft is in the width direction, and the recoil starter is arranged between the power generator and the engine. The recoil knob can be arranged on the end face side of the soundproof case, facing the width direction of the case. By providing the control panel on the surface where the recoil knob is provided, the start and stop operations of the engine can be performed from one side, and the operability is improved.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an appearance of an engine generator according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of FIG. 4 is a rear view of FIG.

The soundproof case 10 includes a front portion 11 and a back portion 1.
2. It has left and right side portions 13, 14, a bottom portion 15, and a top portion 16, and has a substantially rectangular parallelepiped shape having a length L, a width W, and a height H. The front portion 11 and the rear portion 12 constitute front and rear end portions. A concave portion is formed in the front portion 11, and a control panel 17 is provided in the concave portion. The control panel 17 is provided with an engine switch 18 and an auto throttle switch 19, and is for outputting generated power. AC power terminal 20 and a DC power terminal 21 for charging the battery.

Further, the control panel 17 has an operation display section 22a for displaying that the generator is operating.
And an oil warning display section 22b for displaying when the engine oil is insufficient, and an overload display section 22c for displaying that the engine is overloaded.
The upper surface portion 16 is provided with a rod-shaped handle 23 which is gripped when a worker carries the engine generator, and the handle 23 is provided between the upper surface portion 16 and a front-rear direction of the soundproof case 10 through a gap. That is, it extends in the longitudinal direction and is integrated with the upper surface 16 via the connecting portions 24 at both ends.

The soundproof case 10 comprises a first case body 10a and a second case body 10b formed of resin, respectively, and the first case body 10a is a part of both side portions 13, 14, a bottom portion 15, and a portion of the top portion 16. And the front part 11 are integrally formed, and the second case body 10b is
The remaining part of the bottom part 15 and the top part 16 and the back part 12
And are integrally formed. Each case body 10
a, 10b are joined end faces 10c, 10 facing in the front-rear direction.
Since d is formed and joined at these joining end surfaces, the soundproof case 10 is assembled by joining in the front-back direction, that is, in the longitudinal direction.

FIG. 5 is an enlarged sectional view of FIG. 1 with the right side portion 14 removed, and FIG. 6 is an enlarged sectional view of FIG. 1 with the back portion 12 removed.
FIG. 2 is an enlarged half sectional view of FIG. 1 in a state in which a half of an upper surface is removed.

Left and right side portions 13 and 14 of soundproof case 10
An opening is formed to extend to a part of the upper surface portion 16, and the L-shaped cover 2 is opened and closed to open and close each opening.
5, 26 are detachably mounted. As shown in FIG. 6, each of the L-shaped covers 25 and 26 has a portion forming a part of the upper
14, and has an L-shaped cross section, and includes inner plates 25a and 26a and outer plates 25b and 26b, and a soundproof space is provided between the inner and outer plates. . Each L-shaped cover 25, 2
6 is provided at its upper end with an engagement claw 27 which engages with an engagement groove formed on the upper surface 16, and at its lower end is provided with an engagement claw 28 which engages with an engagement groove formed on the side surfaces 13, 14. Is provided. By removing the respective L-shaped covers 25 and 26, maintenance of the engine and the like incorporated in the soundproof case 10 can be performed. However, depending on the layout of the engine or the like incorporated therein, only one of the left and right L-shaped covers 25 and 26 may be detachable, and the other may not be removable.

FIG. 8 is a perspective view showing a pedestal 31 made of sheet metal for fastening the two case bodies 10a and 10b at the bottom surface portion 15. The pedestal 31 has a substantially quadrangular shape as a whole, and an upper portion on both sides. A rising portion 32 bent toward is provided. At both ends of the pedestal 31, fastening tongues 33 having a gap with the pedestal 31 are provided, and at both sides of the pedestal 31 fastening tongues 34 having the same gap are provided. Therefore, each case body 10a, 10b
Are fastened to each other with the tongues 33 and 34 and the pedestal 31
And it is fastened by the pedestal 31. Moreover, the pedestal 31 forms the bottom surface of the soundproof case 10.

On the other hand, in order to fasten the two case bodies 10a and 10b at the handle 23, as shown in FIG. 5, a handle piece 23 integrally formed with the case body 10b is provided.
A female screw fitting 35 is inserted into b by insert molding, and a mounting hole 36b slightly larger in diameter than the screw hole is formed in connection with the screw hole. An attachment hole 36b is formed in the handle piece 23a formed integrally with the case body 10a.
A mounting hole 36a is formed to penetrate the mounting hole 36a, and a large-diameter hole 36c is formed on the front side of the mounting hole 36a. Therefore, by inserting the male screw member 37 from the large-diameter hole 36c side and screw-connecting the male screw portion and the female screw fitting 35, the case bodies 10a and 10b are fastened at the handle pieces 23a and 23b. At the same time, the rod-shaped handle 23 is assembled by the both handle pieces 23a and 23b fastened.

As described above, the two case bodies 10a, 10
b is joined in the longitudinal direction, and is fastened by the pedestal 31 at each bottom surface portion, and is fastened by the respective handle pieces 23a and 23b by the male screw member 37 embedded in the handle 23 extended in the longitudinal direction. Thus, the head of the screw member is not observed from the outside of the soundproof case 10, and the soundproof case has a good appearance. In addition, when the soundproof case 10 is divided into two parts,
Although it is necessary to increase the number of screw members for fastening each case body, the two case bodies 10a and 10b are fastened by a small number of fastening members by dividing the soundproof case 10 into two in the front-rear direction. be able to.

As shown in FIG. 6, the engine unit 40 has an engine 43 having a crankcase 41 and a cylinder 42 above the crankcase 41. The cylinder 42 is provided with a head cover 42a. The engine 43 is mounted in the soundproof case 10 such that the crankshaft 44 incorporated in the crankcase 41 faces the width direction of the soundproof case 10. The crankshaft 44 is located immediately below the longitudinal center of the handle 23 and extends in the lateral direction. As shown in FIG. 6, the engine 43 is shifted to one side 13 of the soundproof case 10. The crankshaft 44 has one end 4
4a is supported on the crankcase 41 by a magnet-side bearing 45, and the other end 44b is supported by a bearing 46 on the opposite side to be rotatable. One end 44a projects outside the crankcase 41, and The end 44b is covered by a removable shaft cover 47. The engine unit 40 is mounted on the pedestal 3 by a plurality of vibration isolating rubbers 48.
1, and a rubber support piece 49 is fixed to the lower surface of the pedestal 31.

FIG. 9 is an enlarged sectional view showing a part of FIG. 6, and a recoil starter 51 is mounted on the magneto side of the engine 43. Recoil starter 51
An engine 43 is provided with a recoil holder 52 in which the disk portion 52a and the cylindrical portion 52b are integrated, and a bolt passing through a plurality of mounting holes 52c provided in the disk portion 52a.
And one end 44a of the crankshaft 44 is
It penetrates into the inside of 2b via a gap. Cylindrical part 52b
A recoil pulley 54 around which a recoil rope 53 is wound is rotatably mounted on the outside of the recoil rope 5.
A rewind spring 55 is provided on the recoil holder 52 in order to apply a spring force in the direction in which the reel 3 is wound. Further, a rotation pin 56a provided with an engagement claw 56 is rotatably mounted on the recoil pulley 54. When the recoil pulley 54 is rotated by the recoil rope 53,
The rotating pin 56a rotates so that the engaging claw 56 protrudes radially outward by centrifugal force.

A flywheel 57 is attached to the protruding end of the crankshaft 44. The flywheel 57 has a disk portion 57b provided with a boss portion 57a fixed to the crankshaft 44 via a key, and an engagement ring portion 57c is provided on an outer peripheral portion thereof. As shown in FIG. 10, the engagement claw 5 protruding radially outward is provided on the inner peripheral surface of the engagement ring portion 57 c of the flywheel 57.
A projection 58 with which the engaging portion 6 engages is formed. Accordingly, by pulling out the recoil rope 53 and rotating the crankshaft 44, when the engaging claw 56 is engaged with the projection 58 by centrifugal force, the crankshaft 44 can be started and rotated via the flywheel 57. A part of the recoil pulley 54 enters the inside of the engagement ring 57a of the flywheel 57, and the flywheel 57 forms a part of the recoil starter 51, and the total thickness of the flywheel 57 and the recoil starter 51 Dimensions can be reduced. Recoil starter 51
Is provided not at the tip of the protruding portion of the crankshaft 44 but at the root thereof, so that at the time of the starting rotation for pulling out the recoil rope 53, the bending force is not greatly applied to the crankshaft 44 and the pulling force of the rope is reliably reduced. It can be converted to a torque of 54.

As shown in FIG.
Is provided with a plurality of connecting portions 59 protruding on the opposite side to the engaging ring portion 57c, and the outer rotor 61 of the power generator 60 is attached to the connecting portion 59 by bolts 62. The outer rotor 61 includes a disk portion 61a fastened to the connecting portion 59 and a cylindrical portion 61b integrated therewith.
A large number of magnets 63 are fixed to the inner peripheral surface of the cylindrical portion 61b at predetermined intervals in the circumferential direction. A cooling fan 64 is disposed between the flywheel 57 and the outer rotor 61.

FIG. 12 is a front view showing the blade side of the cooling fan 64. The cooling fan 64 has a disk portion 64a having a ventilation guide hole at the center and a number of fan blades 64b provided integrally on the surface. have. The disk portion 64a is sandwiched between the disk portion 61a of the outer rotor 61 and the connecting portion 59 of the flywheel 57, and the engagement protrusion 6 provided on the disk portion 64a.
5 is fixed to the outer rotor 61 by engaging with an engagement hole formed in the disk portion 61a.

The cooling fan 64 is covered by a fan cover 66 fixed to the engine 43.
6 has a function as a duct for guiding the air, and the cooling air discharged from the cooling fan 64 is guided toward the engine 43. A power generator cover 67 is fixed to the fan cover 66. The power generator cover 67 has a disk portion 67b in which a number of ventilation holes 67a are formed and a cylindrical portion 67c integrated with the disk portion 67b. The portion 67c is fixed to the fan cover 66.

FIG. 13 is a sectional view taken along the line AA in FIG. 9. A stator 68 is disposed inside the outer rotor 61, and the stator 68 is formed by a bolt 69 penetrating through a plurality of mounting holes 68a. It is fixed to the cover 67. The stator 68 is formed by laminating a large number of steel plates, and a plurality of radially extending slits 68b are formed in the outer peripheral portion in the circumferential direction.
A coil 71 shown by a two-dot chain line in FIG. 9 is wound inside b. However, the coil 71 is omitted in FIG. A ventilation hole 68c is formed in the center of the stator 68, and a plurality of ventilation holes 68d are formed radially outward.

As described above, the power generator 60 is an outer rotor type multi-pole power generator, and the thickness of the power generator 60 can be reduced. Moreover, since the flywheel 57 is a component of the recoil starter 51, the size of the engine unit 40 in the direction along the crankshaft 44, that is, the width of the engine generator can be reduced. An inverter unit 70 for controlling the power output from the power generator 60 to convert it into an alternating current having a predetermined frequency.
Are attached to the bottom surface in the soundproof case 10 as shown in FIG.

The recoil starter 51 is located at the center in the width direction of the engine generator, and since the crankshaft 44 faces the width direction of the soundproof case 10, the recoil rope 5
As shown in FIGS. 1 and 2, the recoil knob 53 a provided at the distal end of the third case 3 can be arranged at the center in the width direction of the front portion 11 of the soundproof case 10. As shown
Since the recoil knob 53a is arranged below the control panel 17 of the front part 11, the recoil starter 5
1 can be performed from the front side of the engine generator, such as starting, running, and stopping the engine, so that a single operation can be performed, and operability can be improved.

FIG. 14 is a perspective view showing the engine unit 40 mounted in the soundproof case 10 from the front side, FIG. 15 is a perspective view showing a state where the fuel tank 72 in FIG. 14 is removed, and FIG. It is the perspective view which looked at FIG. 15 from the back.

As shown in FIG. 14, a fuel tank 72 is disposed in the soundproof case 10, and an inlet 72a of the fuel tank 72 penetrates the upper surface 16 toward the outside. As shown in FIG. 1, the tank cap 73 is screwed. As shown in FIG. 5, a rubber boot 38 is attached to the injection port 72a, and the head of the screw member 37 is not visible from the outside by the boot 38.
The fuel tank 72 is located on the front side of the soundproof case 10 and is shifted to one side so as to be on the opposite side to the engine 43, and has a different shape to avoid interference with members constituting the engine unit 40. However, the shape is not limited to the case shown.

An air cleaner 74 for purifying the outside air supplied to the engine 43 is disposed on the front side of the soundproof case 10, and the air cleaner 74 is connected to the engine 43 through an intake pipe 75 extending straight in the front-rear direction. The carburetor 76 is provided on the intake pipe 75. On the other hand, a muffler 77 is disposed behind the soundproof case 10, and the muffler 77 is connected to the engine 43 by an exhaust pipe 78. An exhaust port 79 formed on the back side of the muffler 77 communicates with an exhaust port 79 a formed on the back section 12 of the soundproof case 10, and
Is exhausted from the back side of the soundproof case 10.
As described above, since the air cleaner 74 is arranged on the front side in the soundproof case 10 and the muffler 77 is arranged on the rear side, even if the width of the soundproof case 10 is reduced, the required engine unit constituent members can be made compact. Can be incorporated into

An ignition coil 80 having an integrated plug cap is attached to the cylinder 42. The L-shaped cover 25 is removed during maintenance of the plug cap and the air cleaner 74. If it is not necessary to remove the opposite L-shaped cover 26 during maintenance, the L-shaped cover 26 may be fixed.

A plurality of cooling air inlets 81 are formed at the front end of the soundproof case 10, and the cooling air outlets 8 are formed at the back 12.
The cooling air outlet 82 is formed by a louver 83 inclined outward and downward as shown in FIG. At the time of power generation, as indicated by an arrow in FIG. 7, cooling air flows in from the front end side of the soundproof case 10, and the inverter unit 70 is efficiently cooled. Part of the cooling air from the outside is taken into the engine 43 through the air cleaner 74. On the other hand, the cooling air from the cooling fan 64 that is driven to rotate by the crankshaft 44 first passes from the plurality of ventilation holes 67 a formed in the power generator cover 67 to the ventilation holes 68 c and 68 d of the stator 68 on one side of the soundproof case 10. Flows in the width direction from the part side.

Next, guided by the fan cover 66, the cooling air is blown around the engine 43. The cooling air blown to the engine 43 and directed toward the other side portion cools the muffler 77 while changing its attitude in the longitudinal direction toward the cooling air discharge port 82 formed in the back surface portion 12 and flowing in a meandering manner. In order to ensure that the cooling air guided by the fan cover 66 flows toward the muffler 77 without sneaking forward, a partition plate is provided in the soundproof case 10 to separate the low-temperature side and the high-temperature side. Have been.

As described above, the cooling air generated by the cooling fan 64 toward the engine 43 flows in the width direction of the soundproof case 10 and then meanders rearward in the longitudinal direction. The engine cools down reliably.

As shown in FIG. 6, the engine 43 is shifted to one side in the left-right direction, and the power generator 60 is disposed closer to the other side via the recoil starter 51 and the cooling fan 64. Is the center in the width direction. As shown in FIGS. 15 and 16, an air cleaner 74 is arranged on the front side of the soundproof case 10, and a muffler 77 is arranged on the rear side. Becomes As a result, the operability of carrying the engine generator while holding the handle 23 in the hand is improved in combination with the narrow width. Although the air cleaner 74 is arranged at the upper part in the soundproof case 10, the weight balance can be secured even if it is arranged at the lower part. However, in this case, a bent intake pipe is used instead of the straight intake pipe 75.

The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0037]

According to the present invention, the engine is arranged in the soundproof case such that the crankshaft faces the width direction of the soundproof case, and the recoil starter is arranged between the engine and the generator connected to the crankshaft. Therefore, the recoil knob can be provided on the end face side of the soundproof case. By providing a control panel on the same side as the recoil knob, starting and stopping the engine can be operated from one side,
Operability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of an engine generator according to an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a rear view of FIG. 1;

FIG. 5 is an enlarged sectional view of FIG. 1 in a state where a right side surface portion is removed.

FIG. 6 is an enlarged cross-sectional view of FIG. 1 in a state where a back portion is removed.

FIG. 7 is an enlarged half sectional view of FIG. 1 in a state in which a half of an upper surface is removed.

FIG. 8 is a perspective view showing a pedestal.

FIG. 9 is an enlarged sectional view showing a part of FIG. 6;

FIG. 10 is a front view showing one side of a flywheel.

FIG. 11 is a front view showing the other side of the flywheel.

FIG. 12 is a front view showing a blade side of a cooling fan.

FIG. 13 is a sectional view taken along line AA in FIG. 9;

FIG. 14 is a perspective view showing an engine unit mounted in the soundproof case from the front side.

FIG. 15 is a perspective view showing a state where a fuel tank in FIG. 14 is removed.

FIG. 16 is a perspective view of FIG. 15 as viewed from the rear side.

[Explanation of symbols]

 Reference Signs List 10 soundproof case 10a, 10b case body 11 front part 12 back part 13, 14 side part 15 bottom part 16 top part 23 handle 25, 26 L-shaped cover 40 engine unit 41 crankcase 42 cylinder 43 engine 44 crankshaft 51 recoil starter 53 Recoil rope 53a Recoil knob 54 Recoil pulley 57 Flywheel 60 Generator 61 Outer rotor 63 Magnet 64 Cooling fan 66 Fan cover 67 Generator cover 68 Stator 70 Inverter unit 72 Fuel tank 72a Inlet 74 Air cleaner 77 Muffler

Claims (1)

[Claims] A soundproof case having a substantially rectangular parallelepiped shape having both end faces, both side faces, a bottom face, and a top face; an engine disposed in the soundproof case such that a crankshaft extends in a width direction of the soundproof case; A generator arranged in the soundproof case such that a rotation center axis of a rotor connected to a crankshaft is in a width direction of the soundproof case, and disposed between the generator and the engine; A soundproof engine generator comprising: a recoil starter to be connected; and a recoil knob disposed on one of the end face portions and attached to a tip of a recoil rope wound around the recoil starter.