JP2004173343A - Engine generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve cooling efficiency of a generator body having a concentratedly wound stator. <P>SOLUTION: The generator body 3 is connected with a crank shaft 11 of an engine through an adapter 16, and a cooling fan 13 for generating a cooling wind for cooling the engine and the generator body 3 is connected with the crank shaft 11. The generator body 3 is constituted of a rotor 18 of which the rotation is driven by the crank shaft 11, and the stator 21 attached onto the outside of the rotor. The stator 21 is supported by a stator cover 24 disposed opposite to the cooling fan 13. A plurality of cooling wind passages 19 are formed in the rotor 18, and a cooling wind guide clearance is formed between coils 22 provided at the stator 21. The cooling wind flowing from a ventilation hole flows through the cooling wind passages 19 and the cooling wind guide clearance to cool the generator body 3. A coil stator 32 is disposed between the generator body 3 and the cooing fan 13. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine generator having an engine and a power generator driven by the engine.
[0002]
[Prior art]
Engine generators in which the generator is driven by the engine include a frame type in which the frame forms a rectangular parallelepiped frame that forms the skeleton of the engine generator, and the engine and the generator are built into the frame. There is a soundproof type in which an engine and a power generator are incorporated in a soundproof case having a shape. In any type of engine generator, in order to cool the engine and the power generator, the cooling fan is rotated by the crankshaft of the engine, and the cooling fan generates cooling air.
[0003]
On the other hand, the power generator of the engine generator includes a stator provided with a coil and a rotor provided with a permanent magnet, and an outer rotor type in which the rotor is provided so as to surround the outside of the stator; (See Patent Literatures 1 and 2). Further, as a power generating body of the inner rotor type, a concentrated winding type in which a coil is wound around a large number of bobbins extending in a radial direction around an outer rotor, and a coil inserted into a slot formed in an outer peripheral portion of the outer rotor. There is a distributed winding type.
[0004]
[Patent Document 1]
JP-A-2001-21047 [0005]
[Patent Document 2]
JP 2001-295657 A
[Problems to be solved by the invention]
In the inner rotor type engine generator, the rotor is driven to rotate by the engine, the cooling fan is driven, and the generator and the engine are cooled by the cooling air generated by the cooling fan. It is an important solution to ensure that the power generator and the engine can be cooled by the cooling air generated by the cooling device.
[0007]
An object of the present invention is to improve the cooling efficiency of a power generator having a concentrated winding stator.
[0008]
[Means for Solving the Problems]
An engine generator of the present invention is connected to a crankshaft of an engine, is driven by the engine, and has a cooling air passage formed therein. A stator having a coil mounted thereon to form a power generator with the rotor; a cooling fan connected to the crankshaft to generate cooling air for cooling the engine and the power generator; and a cooling fan arranged opposite to the cooling fan. And a stator cover that supports the stator and has a ventilation hole formed therein, and guides the cooling air flowing from the ventilation hole to the cooling air passage and the cooling air guide gap to cool the power generator. It is characterized by the following.
[0009]
The engine generator according to the present invention is characterized in that a recoil starter is disposed between the power generator and the cooling fan.
[0010]
In the engine generator according to the present invention, since the cooling air is caused to flow through the cooling air passage formed in the rotor and the cooling air guide gap formed between the coils of the stator, the power generator having the concentrated winding stator is provided. The body can be cooled reliably, and the cooling efficiency can be improved. Further, since the recoil starter is disposed between the power generator and the cooling fan, the space between the power generator and the cooling fan can be effectively used, and the size of the engine generator including the recoil starter can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an external appearance of the engine generator. The engine generator has a support frame 1 formed by bending a pipe into a substantially rectangular parallelepiped shape, and the support frame 1 forms a skeleton of the engine generator. A frame is formed. A power generation unit 4 formed by assembling an engine 2 as a drive source and a power generator 3 is attached to the support frame 1. This engine generator employs an inverter system as a control system. An inverter unit for controlling a generated voltage, that is, a control unit 5 is mounted adjacent to the power generation unit 4.
[0012]
A control panel 6 is provided on the front side of the support frame 1. The control panel 6 is provided with switches such as an engine switch and an auto throttle switch, and output terminals such as an AC power terminal and a DC power terminal. I have. A fuel tank 7 for storing fuel to be supplied to the engine 2 is provided at an upper portion of the support frame 1, and a fuel cap 8 is detachably provided at a fuel supply port provided on an upper surface of the fuel tank 7. I have. As the engine 2, an air-cooled single-cylinder OHV gasoline engine is mounted, and a power generator 3 is driven by the engine 2.
[0013]
FIG. 2 is an enlarged sectional view showing the power generation unit 4 shown in FIG. 1, FIG. 3 is a left side view of the power generator shown in FIG. 2, and FIG. 4 is a power generator shown in FIG. FIG.
[0014]
As shown in FIG. 2, a flywheel 12 for stabilizing the engine output is attached to a crankshaft 11 of the engine 2, and the flywheel 12 is fixed to the crankshaft 11 via a key via a boss. 12a and a disk portion 12b extending radially from the boss portion 12a. A cooling fan 13 is attached to the disk portion 12b. The cooling fan 13 has a disk portion 13a fixed to the flywheel 12, and a number of fan blades 13b provided integrally with the disk portion 13a. ing. The cooling fan 13 is covered by a fan cover 14 fixed to the engine 2. The fan cover 14 has a cooling air intake 15 a opened to the power generator 3 side and a cooling air opened to the engine 2. Outlet 15b.
[0015]
An adapter 16 is fixed to the boss 12 a of the flywheel 12. The adapter 16 includes a boss 16 a fixed to the flywheel 12 by bolts 17, and a shaft 16 b protruding from the boss 16 a in the axial direction. have. A rotor 18 is fixed to the tip of the shaft portion 16b. The rotor 18 has a shaft portion 18a having a tapered portion that fits into a tapered portion formed at the tip of the shaft portion 16b of the adapter 16, and is fixed to the rotor 18 A plurality of magnets 18c are mounted on the outer periphery of the rotor body 18b at predetermined intervals in the circumferential direction, and a plurality of magnets 18c are provided on the center side as shown in FIGS. 2 and 4. Cooling air passage 19 is formed.
[0016]
A stator 21 is incorporated outside the rotor 18, and the power generator 3 formed by the rotor 18 and the stator 21 is of an inner rotor type. The rotation generates an electromotive force in the coil 22 to generate power. Numerous bobbins extending in the radial direction are formed on the stator 21, and coils 22 are wound around each bobbin, and the stator 21 is concentratedly wound. By forming the stator 21 in a concentrated winding, as shown in FIGS. 3 and 4, a cooling air guide gap 20 is formed between the coils 22 circumferentially adjacent to each other.
[0017]
The engine side of the stator 21 is engaged with a plurality of support stays 23 provided on the fan cover 14, and the distance between the stator 21 and the fan cover 14 is set by the support stays 23. The support stay 23 may be formed integrally with the fan cover 14, or the support stay 23 may be attached to the fan cover 14 as a separate component from the fan cover. A stator cover 24 is attached to the power generator 3. The stator cover 24 has a tubular body 24 a that supports the stator 21 at an outer peripheral portion, and an end plate 24 b integrated with the tubular body 24 a. The portion 24a is provided with a bracket portion 24c that is screwed to the support frame 1.
[0018]
A boss portion 24d for supporting the bearing 25 is provided integrally with the end plate portion 24b, and a bolt 26 passing through the center of the bearing 25 is screwed to the adapter 16. Thus, the rotor 18 is supported by the stator cover 24 via the bolt 26.
[0019]
A recoil case 31 is arranged between the fan cover 14 and the power generator 3 and radially outward of the adapter 16, and a recoil starter 32 is incorporated in the recoil case 31. The recoil case 31 has a boss portion 31a for forming a ventilation gap 29 with the adapter 16, and an outer wall portion 31c integrated with the boss portion 31a via an end plate portion 31b. A recoil pulley 33 is rotatably mounted in a space formed by the portion 31a and the outer wall portion 31c. The recoil pulley 33 is formed integrally with a boss portion 33a rotatably fitted to the boss portion 31a of the recoil case 31 via a bearing 34, and is formed integrally with an outer peripheral portion of an end plate portion 33b integral with the boss portion 33a. The recoil rope 35 is wound around the pulley body 33c.
[0020]
As shown in FIG. 1, when the recoil pulley 33 is rotated by the recoil rope 35 by pulling the recoil knob 36 provided at the tip of the recoil rope 35, the engagement claws 37 provided on the recoil pulley 33 are provided on the adapter 16. The crankshaft 11 rotates by engaging with the engagement protrusion 38 provided, and the engine 2 is started. To rewind the recoil rope 35 to the recoil pulley 33 after the engine is started, a rewind spring 39 is incorporated between the recoil pulley 33 and the recoil case 31. Since the recoil starter 32 is disposed between the power generator 3 and the cooling fan 13 as described above, the engine generator including the recoil starter 32 effectively utilizes the space between the power generator 3 and the cooling fan 13. Can be reduced in size.
[0021]
As shown in FIG. 3, a plurality of ventilation holes 27a are formed in the end plate portion 24b of the stator cover 24 at predetermined intervals in the circumferential direction, and the cylindrical body portion 24a is formed on both left and right sides in FIG. A plurality of ventilation holes 27b are formed. As described above, since a large number of ventilation holes 27a and 27b are formed in the stator cover 24, when the cooling fan 13 is driven to generate cooling air, sufficient outside air flows from the outside to the inside of the stator cover 24. Will flow in. Further, a plurality of cooling air passages 19 are formed in the rotor 18, and a cooling air guide gap 20 is formed between the coils 22. The power generator 3 is cooled by flowing through the wind guide gap 20.
[0022]
As shown in FIG. 1, a unit cover 45 is attached to the front side of the support frame 1 below the control panel 6, and the unit cover 45 has a slit-shaped cooling air intake 46. Is formed, and the control unit 5 is disposed inside the unit cover 45.
[0023]
Therefore, when the engine 2 is started using the recoil knob 36 of the recoil starter 32, the power generator 3 is driven and the cooling fan 13 generates cooling air. The generated cooling air causes the cooling air to flow into the engine generator from the outside of the engine generator via the cooling air intake port 46 of the unit cover 45. The cooling air flowing into the stator cover 24 from the ventilation holes 27a and 27b flows through the cooling air passage 19 and the cooling air guide gap 20 to cool the power generator 3. The cooling air that has cooled the power generator 3 flows around the recoil starter 32, and flows into the cooling fan 13 from the cooling air intake 15 a through the outside of the recoil starter 32 and the gap 29. The cooling air flowing into the cooling fan 13 is blown toward the engine 2 from the outlet 15b to cool the engine 2.
[0024]
In the concentrated winding type stator 21, the cooling air guide gap 20 can be formed between the coils 22. By forming the cooling air passage 19 in the rotor 18, the cooling air guide gap 20 and the cooling air passage 19 flow. The power generator 3 can be cooled by the cooling air, and the engine 2 can be cooled by the cooling air after cooling the power generator 3.
[0025]
The present invention is not limited to the above embodiment, and can be variously modified without departing from the gist thereof. For example, the illustrated embodiment is an engine generator in which the power generation unit 4 is incorporated in the support frame 1, but a soundproof type engine generator in which a soundproof cover is attached to the support frame 1, or a rectangular parallelepiped sound generator. The present invention can be applied to a soundproof type engine generator in which an engine or a power generator is incorporated in a case.
[0026]
【The invention's effect】
According to the present invention, the cooling air flowing from the ventilation hole formed in the stator cover is caused to flow into the cooling air guide gap formed between the cooling air passage formed in the rotor and the coil of the stator. Therefore, the power generator having the concentratedly wound stator can be cooled, and the cooling efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the appearance of an engine generator.
FIG. 2 is an enlarged sectional view showing the power generation unit shown in FIG.
FIG. 3 is a left side view of the power generator shown in FIG. 2;
FIG. 4 is a right side view of the power generator shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support frame 2 Engine 3 Power generator 4 Power generation unit 11 Crankshaft 13 Cooling fan 14 Fan cover 15a Inlet 15b Outlet 16 Adapter 18 Rotor 19 Cooling air passage 20 Cooling air guide gap 21 Stator 24 Stator cover 27a, 27b Vent hole 32 Recoil starter

Claims (2)

A rotor connected to a crankshaft of the engine, driven by the engine and having a cooling air passage formed therein;
A stator mounted on the outside of the rotor, and a coil mounted in a circumferential direction through a cooling air guide gap to form a power generator with the rotor;
A cooling fan coupled to the crankshaft to generate cooling air for cooling the engine and the power generator;
A stator cover that is arranged to face the cooling fan, supports the stator, and has a ventilation hole formed therein,
An engine generator, wherein the cooling air flowing from the ventilation hole is guided to the cooling air passage and the cooling air guide gap to cool the power generator. 2. The engine generator according to claim 1, wherein a recoil starter is arranged between the power generator and the cooling fan.

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