JP7449491B2 - Cooling structure of power generation unit for range extender vehicle - Google Patents

Description

The present invention relates to a cooling structure for a power generation unit for a range extender vehicle.

BACKGROUND ART Vehicles that are equipped with a small generator are known as electric vehicles driven by electric motors. The small-sized generator has, for example, a power generation engine, and can generate power with the power generation engine and supply electric power to the electric vehicle. By supplying power to the electric motor of the electric vehicle by the small generator, for example, the cruising distance of the electric vehicle can be extended. As such a small-sized generator, for example, a device disclosed in Patent Document 1 is known.

The small generator generates electricity using a power generation engine, and includes an inverter and the like. Moreover, a small-sized generator requires a cooling structure for cooling a power generation engine, electric equipment such as the inverter, and the like.

Japanese Patent Application Publication No. 2010-7599

In a power generation unit equipped with a generator that generates power by driving a power generation engine, the power generator supplies electric power to electrical equipment such as an inverter. In addition, in such a power generation unit, heat is generated due to the operation of the power generation engine, so it is necessary to efficiently radiate heat to the outside of the power generation unit.

A muffler is usually connected to a power generation engine. In order to downsize the power generation unit, it is preferable that the muffler and electrical equipment such as the inverter be housed inside the power generation unit. The temperature around the muffler rises due to heat radiation from the muffler when the power generation engine is driven. If the configuration of the above example is applied to cool an electrical device such as an inverter in a power generation unit, there is a possibility that the cooling efficiency will decrease due to heat radiation from the muffler. Therefore, in the structure as in the above example, there is room for improvement in terms of downsizing the power generation unit in which the power generation engine is mounted and cooling the inside efficiently.

The present invention has been made to solve the above problems, and its purpose is to provide a power generation unit for a range extender vehicle that is capable of downsizing the power generation unit that generates power using a power generation engine and efficiently cooling the inside. The objective is to provide a cooling structure for

To achieve the above object, the cooling structure of the power generation unit for a range extender vehicle according to the present invention includes a power generation engine, a muffler through which exhaust gas emitted from the power generation engine flows, and a cooling structure that includes a power generation engine driven by the power generation engine. A generator that generates electricity, an electrical device to which power is supplied from the generator and is provided with a plurality of cooling fins, a pedestal on which the electrical device is installed, and a cooling fan capable of blowing cooling air to the cooling fins. It is equipped with In the cooling structure of the power generation unit for a range extender vehicle, the muffler is arranged adjacent to the electrical equipment, the pedestal includes a heat shield plate that blocks heat radiation from the muffler to the electrical equipment, and the pedestal includes a heat shield plate that blocks heat radiation from the muffler to the electrical equipment. The fan includes a first air blowing area in which the cooling fins are arranged, and a second air blowing area that is formed between the heat shield plate and the muffler outer wall surface in an area different from the first air blowing area. The first air blowing area and the second air blowing area are configured to individually blow cooling air.

According to the present invention, it is possible to downsize a power generation unit that generates power using a power generation engine and to efficiently cool the inside thereof.

1 is a plan view showing an embodiment of a cooling structure for a power generation unit according to the present invention. FIG. 2 is a perspective view of the power generation unit of FIG. 1 viewed from the front side of the vehicle. FIG. 3 is a perspective view of the inverter and muffler of FIG. 2 viewed from the rear side of the vehicle. 2 is a schematic cross-sectional view taken along the line AA in FIG. 1. FIG. FIG. 5 is an enlarged cross-sectional view showing the vicinity of the cooling fan in FIG. 4; 2 is a schematic cross-sectional view taken along the line BB in FIG. 1. FIG.

Hereinafter, one embodiment of a cooling structure for a power generation unit 1 for a range extender vehicle according to the present invention will be described with reference to the drawings (FIGS. 1 to 6).

In addition, in the figure, the arrow Fr direction indicates the front in the vehicle longitudinal direction. The "front part (front end) and rear part (rear end)" in the description of the embodiment correspond to the front part and the rear part in the longitudinal direction of the vehicle. Further, arrows R and L indicate the right and left sides in the vehicle width direction, respectively, and "left and right" in this embodiment correspond to "left side" and "right side" when the occupant faces the front of the vehicle. There is.

A power generation unit 1 for a range extender vehicle according to the present embodiment is a power generation unit 1 that is removably attached to, for example, under the floor of a luggage space provided at the rear of a vehicle, and has a generally rectangular parallelepiped shape that extends in the vehicle width direction as a whole. It is in a state of In this case, the power generation unit 1 is inserted into the vehicle through an opening provided at the rear of the vehicle and fixed to the rear of the vehicle, for example.

As shown in FIGS. 1 and 2, the power generation unit 1 of this embodiment includes a power generation engine 20, a fuel tank 25, a muffler 30, a pedestal 40, an inverter (electrical device) 50, and a generator 60. , and a cooling device 70. Further, the power generation unit 1 includes a housing structure 10 in which the above-described devices and members are housed.

The housing structure 10 has a tray 11 and a top lid (not shown). The tray 11 has an installation surface section 12 and a side wall section 15. The installation surface section 12 has a substantially rectangular shape extending in the vehicle width direction, and the above-described power generation engine 20, fuel tank 25, muffler 30, pedestal 40, generator 60, cooling device 70, etc. are installed on the installation surface section 12. ing. The side wall portion 15 is a vertical wall that projects upward from the vehicle width direction from both ends of the installation surface portion 12 in the vehicle width direction, and extends in the vehicle longitudinal direction. A side flange 16 that protrudes outward in the vehicle width direction and extends in the longitudinal direction of the vehicle is provided on the upper part of the side wall 15. On the upper surface of the side flange 16, a handle 17 used for installation work, transportation, etc. is provided. It is provided. Although not shown, the upper lid has a substantially rectangular box shape that covers the installation surface 12 of the tray 11 from above the vehicle. 11.

The power generation engine 20 includes a cylinder case 21 that accommodates a cylinder (not shown), a piston (not shown), etc., and a crank case 23 that covers a crankshaft 23a. Although detailed illustration of the piston is omitted in this embodiment, the sliding direction of the piston is indicated by arrow A in FIG. Furthermore, the approximate position of the crankshaft 23a is shown virtually in FIG. The crankcase 23 is a member extending in the vehicle width direction, and is disposed approximately in the center of the vehicle width direction at the rear of the installation surface portion 12 of the tray 11. The crankshaft 23a is housed inside the crankcase 23 while extending in the vehicle width direction. Further, the piston is housed inside the cylinder case 21 while extending in the longitudinal direction of the vehicle, and reciprocates in the longitudinal direction of the vehicle (in the direction of arrow A in FIG. 1) when the power generation engine 20 is driven.

The fuel tank 25 is a tank filled with fuel for driving the power generation engine 20. The upper surface of the fuel tank 25 is flat, and the upper surface has an opening (not shown) for replenishing fuel. It is provided. A cap 26 is attached to the opening, which is removable when refueling. The fuel tank 25 is arranged at the right front corner of the installation surface section 12 of the tray 11 of the accommodation structure 10.

The muffler 30 is a member extending in the vehicle width direction, through which exhaust gas released from the power generation engine 20 flows. As shown in FIG. 2, the muffler 30 is arranged adjacent to the cylinder case 21, and the left end of the muffler 30 in the vehicle width direction is connected to the cylinder case 21 via a connection pipe 31. . The muffler 30 extends in the vehicle width direction, and the right end of the muffler 30 in the vehicle width direction is arranged at the front left corner of the installation surface 12 of the tray 11 of the storage structure 10.

As shown in FIGS. 1, 3, and 4, on the side of the muffler 30 located at the corner, that is, on the right side in the vehicle width direction on the rear side of the muffler 30, there is a substantially cylindrical cylinder extending in the longitudinal direction of the vehicle. A shaped exhaust pipe 32 is attached. The exhaust gas that has passed through the muffler 30 flows into the exhaust pipe 32, and the exhaust gas that has flowed in is exhausted to the outside of the power generation unit 1 from the rear of the exhaust pipe 32. The exhaust pipe 32 will be explained later.

As shown in FIGS. 1 and 2, the generator 60 is a device that extends in the vehicle width direction, and is fixed to the installation surface portion 12 located on the left side of the crankcase 23 in the vehicle width direction. The generator 60 has a generator main body 61 and an installation bracket 63. The generator main body 61 is arranged on the left side of the crankcase 23 in the vehicle width direction, and the rear end of the generator main body 61 is arranged near the rear end of the installation surface section 12. The generator main body 61 has a rotating shaft 62 extending in the vehicle width direction, and the left side portion of the crankshaft 23a is connected to the rotating shaft 62. In addition, in this embodiment, the approximate position of the rotating shaft 62 is shown virtually in FIG. The generator 60 generates power by rotating a rotating shaft 62 by driving the power generation engine 20 . Further, the generator main body 61 is connected to cooling water pipes 81 and 82 through which cooling water (refrigerant) flows through a radiator 71, which will be described later.

The installation bracket 63 is a member for fixing the generator main body 61 to the installation surface portion 12, and is arranged on the left side of the generator main body 61 in the vehicle width direction. The installation bracket 63 extends above the vehicle from the installation surface portion 12 and has a vertical wall facing in the vehicle width direction. The vertical wall is arranged between the exhaust pipe 32 and the generator main body 61, and the left side of the generator main body 61 is joined to the vertical wall with bolts or the like.

The cooling device 70 is fixed to the installation surface portion 12 located on the right side of the crankcase 23 in the vehicle width direction. The cooling device 70 is a device that extends in the vehicle width direction as a whole, and the rear end of the cooling device 70 is disposed near the rear end of the installation surface portion 12. The cooling device 70 is provided with an engine-linked fan (not shown) that cools the cylinder case 21, its interior, etc., and a radiator 71.

The engine-linked fan is attached to the right side of the crankshaft 23a in the vehicle width direction via a reduction gear (not shown) or the like, and rotates coaxially in conjunction with the crankshaft 23a. Cooling air generated by the rotation of the engine-linked fan is blown onto the cylinder case 21, for example.

The radiator 71 is provided at the right end of the cooling device 70. Further, a cooling water pipe 81 is connected to the radiator 71. The cooling water piping includes a sending side piping 81 that sends out the cooling water cooled inside the radiator 71, and a return side piping 81 that sends out the cooling water cooled inside the radiator 71, and a return side piping that returns the coolant whose temperature has increased after heat exchanged outside the radiator 71 to the radiator 71. (not shown).

Next, the pedestal 40 will be explained. The pedestal 40 is a substantially rectangular parallelepiped-shaped hollow member that covers the muffler 30 from above the vehicle. The front wall 41 of the pedestal 40 extends in the vehicle vertical direction, faces the front of the vehicle, and is disposed near the front end of the installation surface section 12. The left side wall 43 of the pedestal 40 extends in the vehicle vertical direction, extends toward the rear of the vehicle from the left end of the front wall 41, and is disposed adjacent to the left side wall portion 15 of the tray 11. The right side wall 42 of the pedestal 40 extends in the vehicle vertical direction, and extends from the right end of the front wall 41 toward the rear of the vehicle.

Further, a substantially semicircular notch 44 is provided in the right side wall 42 upward from the lower end, and the notch 44 is formed so as to surround the muffler 30 from above the vehicle. That is, in this example, the muffler 30 is arranged to pass through the right side wall 42.

The pedestal 40 has a heat shield plate 45 that blocks heat radiation from the muffler 30 to the inverter 50 and the like. The heat shield plate 45 is disposed between the right side wall 42 and the left side wall 43 of the pedestal 40, connects the right side wall 42 and the left side wall 43, and extends in the vehicle longitudinal direction. The heat shield plate 45 is arranged above the vehicle at a distance from the upper end of the outer wall surface of the muffler 30. As shown in FIGS. 4 to 6, the heat shield plate 45 of this example includes two horizontally arranged flat plates (upper plate 45A, lower plate 45b) spaced apart from each other in the vertical direction of the vehicle. An air layer 45C is formed between the upper plate 45A and the lower plate 45B, thereby suppressing heat emitted from the outer wall surface of the muffler 30 from being transmitted to the inverter 50 and the like.

Next, the inverter 50 will be explained. As shown in FIGS. 2 and 3, the inverter 50 is a device fixed to the upper part of the pedestal 40, and includes a main body 51, a cooling water tank 52, and a plurality of cooling fins 53. . The main body portion 51 is disposed above the heat shield plate 45 in the vehicle and has a substantially rectangular shape when viewed from above, and electrical components constituting the inverter 50 are housed inside the main body portion 51 . A tank installation hole for accommodating a cooling water tank 52 is provided in the lower part of the main body portion 51 . The tank installation hole is provided below a portion where electrical components are accommodated. Further, a cooling fan 55 is provided at the front portion of the main body portion 51 . The cooling fan 55 will be explained later.

As shown in FIGS. 4 to 6, the cooling water tank 52 is a substantially rectangular parallelepiped-shaped tank extending in the longitudinal direction of the vehicle, and is inserted into the tank installation hole and is in contact with the top surface of the bottom of the tank installation hole. It is attached with. A feed side pipe 81 and an outflow side pipe 82 are connected to the cooling water tank 52 . The sending pipe 81 is a pipe for causing the cooling water cooled by the radiator 71 to flow into the cooling water tank 52. The outflow side piping 82 is a piping for causing the cooling water whose temperature has increased after heat exchange in the cooling water tank 52 to flow out from the cooling water tank 52 toward the radiator 71 via the generator 60 and the like.

The plurality of cooling fins 53 are provided below the cooling water tank 52, as shown in FIGS. 4 to 6. The main body portion 51, the cooling water tank 52, and the cooling fins 53 are arranged in this order from above to below. Further, each cooling fin 53 protrudes downward from the vehicle from the lower surface side of the bottom of the tank installation hole and extends in the longitudinal direction of the vehicle. As shown in FIG. 5, the plurality of cooling fins 53 are arranged at intervals in the vehicle width direction. Further, the lower ends of the cooling fins 53 are spaced apart from the heat shield plate 45.

The cooling fan 55 is provided at the front of the main body 51 of the inverter 50, as shown in FIGS. 1, 2, and 6. The upper end of the cooling fan 55 is arranged so as to be substantially aligned with the upper end of the main body 51 in the vehicle vertical direction. The lower end of the cooling fan 55 is arranged on the front wall 41 of the pedestal 40 located slightly above the upper end of the muffler 30. In this example, the cooling fan 55 is configured to be able to blow cooling air to first to third blowing areas 91 to 93, which will be described later.

Here, the ventilation area through which the cooling air taken in by the cooling fan 55 flows will be described. As shown in FIG. 6, the cooling structure of the power generation unit 1 of this embodiment has three ventilation regions, that is, a first ventilation region 91, a second ventilation region 92, and a third ventilation region 93. There is.

The first ventilation area 91 is an area where the cooling fins 53 are arranged, is an area formed between the heat shield plate 45 and the bottom of the tank installation hole, and extends in the vehicle longitudinal direction. The second ventilation region 92 is a region different from the first ventilation region 91, and is a region formed between the heat shield plate 45 and the outer wall surface of the muffler 30, and extends in the vehicle longitudinal direction.

As shown in FIGS. 4 and 6, the third ventilation area 93 is an area in the upper part of the main body part 51, and is an area around the part covering the electrical components. A baffle plate 95 is provided at the front of the third blowing area 93 . The baffle plate 95 extends from an intermediate portion of the rear portion of the cooling fan 55 in the vertical direction of the vehicle toward the rear of the vehicle so as to be inclined upwardly of the vehicle. The lower end of the baffle plate 95 is arranged above the second blowing area 92 of the vehicle. In this embodiment, the third ventilation area 93, the first ventilation area 91, and the second ventilation area 92 are arranged in this order from the upper side to the lower side of the vehicle.

As shown in FIG. 6, the cooling fan 55 faces a first blowing area 91, a second blowing area 92, and a third blowing area 93. That is, the cooling fan 55 is provided in front of the first to third blowing areas 91 to 93, and cools the first blowing area 91, the second blowing area 92, and the third blowing area 93 individually. It is configured to blow air.

The cooling air flowing through the first blowing area 91 flows along the arrow X1 in FIGS. 4 and 6, exchanges heat with the cooling fins 53, and increases the temperature of the cooling air. Thereby, the cooling fins 53 are cooled. The cooling air flowing through the second blowing region 92 flows along the arrow X2 in FIGS. 4 and 6, exchanges heat with the heat shield plate 45 and the outer wall surface of the muffler 30, and increases the temperature of the cooling air. As a result, the outer wall surface of the muffler 30 and the like are cooled. Further, the cooling air flowing through the third blowing region 93 cools the main body portion 51 whose temperature has increased due to the electrical components.

Generally, by locating electrical equipment such as the inverter 50 away from the exhaust system that includes the muffler 30 for noise reduction, it is possible to suppress the temperature of the electrical equipment from rising due to heat radiation from the exhaust system. can. However, in this case, the layout is limited.

On the other hand, in this embodiment, heat radiation from the muffler 30 to the entire power generation unit 1 can be suppressed by providing the heat shield plate 45 on the vehicle upper side of the muffler 30 for noise reduction. Furthermore, the region blown by the cooling fan 55 provided in the main body 51 of the inverter 50 is divided by the heat shield plate 45 to provide a first blown region 91 and a second blown region 92. As a result, the flow in the first ventilation region 91 and the second ventilation region 92 inhibits heat transfer like an air curtain, so that the transfer of heat from the outer wall surface of the muffler 30 to the inverter 50 etc. is reduced. The required temperature can be maintained.

With this configuration, it is possible to effectively cool electrical equipment, such as the inverter 50, without placing the equipment separately in the exhaust system, and it is possible to arrange the components of the power generation unit 1 more compactly. This increases the freedom of layout.

In addition, by further providing a third ventilation area 93 as an area separate from the first and second ventilation areas 91 and 92, the ventilation by the cooling fan 55 is directed to arrows X3 and X4 in FIGS. 4 and 6. Since it flows not only along the cooling fins 53 but also around the main body portion 51 of the inverter 50, the ambient temperature of the inverter 50 can also be lowered, making more effective cooling possible.

In addition, in this embodiment, as shown in FIG. 1, the muffler 30 is arranged at the corner of the tray 11, and the exhaust pipe 32 connected to the muffler 30 is arranged so as to extend in the air blowing direction of the cooling fan 55. The exhaust pipe 32 and the muffler 30 virtually form a first L-shape L1 when viewed from above. In FIG. 1, the first L-shape L1 is indicated by a broken line. Electrical equipment such as the inverter 50 is disposed above the muffler 30 in the vehicle via the heat shield plate 45 and above the corner of the first L-shape L1.

The above configuration is a layout corresponding to the corner of the housing structure 10 of the rectangular parallelepiped-shaped power generation unit 1, and a member serving as a heat source is arranged along the vicinity of the outer wall of the top cover (not shown) of the power generation unit 1. Furthermore, by setting the flow direction in the exhaust pipe 32 forming the first L-shape L1 in the same direction as the cooling direction, air around the heat source downstream of the muffler 30 can be efficiently scavenged. Furthermore, by arranging electrical equipment such as the inverter 50 on the upper side of the vehicle at the corner of the first L-shape L1, it is possible to reduce circulation of air whose temperature has increased due to the exhaust system around the inverter 50 and the like. Become.

As described above, the power generation engine 20 of this embodiment is disposed at the intermediate portion in the vehicle width direction of the installation surface portion 12 of the tray 11 of the housing structure 10, the piston extends in the longitudinal direction of the vehicle, and the crankshaft 23a They are arranged to extend in the vehicle width direction. That is, as shown in FIG. 1, the piston and the crankshaft 23a virtually form a second L-shape L2 when viewed from above. In FIG. 1, the second L-shape L2 is indicated by a broken line, similar to the first L-shape. In this embodiment, the corner portions of the first L-shape L1 and the corner portions of the second L-shape L2 are arranged to face each other. In this example, the first L-shape L1 and the second L-shape L2 form a rectangle when viewed from above.

By arranging the power generation engine 20 and the generator 60 to form the second L-shape L2 described above, it is possible to prevent the cooling and scavenging of the exhaust system forming the first L-shape L1 described above. Furthermore, a more compact layout is possible.

Further, the heat shield plate 45 of this embodiment extends in the vehicle width direction along the longitudinal direction of the muffler 30 and connects the left side wall 43 and the right side wall 42 of the pedestal 40. Further, a second ventilation region 92 is formed below the heat shield plate 45 and between the right side wall 42 and the left side wall 43 of the pedestal 40 . Since the right side wall 42 and the left side wall 43 of the pedestal 40 are along the air blowing direction, it is possible to suppress hot air from dispersing to electrical equipment such as the inverter 50, and the cooling air flowing inside the second air blowing area 92. The air efficiently flows toward the exhaust port provided on the downstream side of the second blowing area 92, and the second blowing area 92 is efficiently scavenged.

Furthermore, by providing a notch 44 surrounding the muffler 30 in the left side wall 43, for example, even if the volume of the muffler 30 is set large to reduce noise, the width of the pedestal 40 can be This prevents the width from exceeding the possible width, and as a result, the base 40 can be made more compact. Also. By providing the semicircular (arch-shaped) notch 44, the weight of the pedestal 40 can be reduced, and the rigidity of the pedestal 40 is ensured by reinforcing it with the spacing. As a result, even if the inverter 50 of this embodiment has a cooling water tank 52 and is designed to be heavy, it is possible to ensure rigidity that reduces vibrations in the vehicle vertical direction and the like during vehicle operation.

Moreover, the power generation unit 1 of this embodiment is equipped with the exhaust fan 35, as shown in FIG. The exhaust fan 35 is provided on the downstream side of the first ventilation area 91 and the second ventilation area 92, and moves the air inside the power generation unit 1 including the ventilation areas 91, 92, and 93 to the outside of the power generation unit 1. Exhaust. In this example, the exhaust fan 35 is arranged on the left side of the rear end of the power generation unit 1 so as to be adjacent to the power generator 60. By providing the exhaust fan 35 on the downstream side in the blowing direction, air whose temperature has increased in the blowing regions 91, 92, and 93 can be efficiently exhausted to the outside of the power generation unit 1. Thereby, the cooling effect of the power generation unit 1 can be further improved.

The description of this embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Further, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope of the claims.

For example, in the present embodiment, the cooling fan 55 is configured to blow air to all of the first to third air blowing areas 91, 92, and 93, but the invention is not limited to this. The third ventilation area 93 may be cooled by a separately provided fan. In this case, an intake fan may be provided on the top surface of the top cover (not shown) of the housing structure. Moreover, although the present embodiment describes the power generation unit 1 attached to the rear of the vehicle, the present invention is not limited to this. For example, it may be inserted from the side of the vehicle.

1 Power generation unit 10 Housing structure 11 Tray 12 Installation surface 15 Side wall 16 Side flange 17 Handle 20 Power generation engine 21 Cylinder case 23 Crank case 23a Crankshaft 25 Fuel tank 26 Cap 30 Muffler 31 Connection pipe 32 Exhaust pipe 35 Exhaust fan 40 pedestal 41 front wall 42 right side wall (side wall)
43 Left side wall (side wall)
44 Notch 45 Heat shield plate 45A Upper plate 45B Lower plate 45C Air layer 50 Inverter (electrical equipment)
51 Main body 52 Cooling water tank 53 Cooling fins 55 Cooling fan 60 Generator 61 Generator main body 62 Rotating shaft 63 Installation bracket 70 Cooling device 71 Radiator 81 Sending side piping 82 Outflow side piping 91 First blowing area 92 Second Air blowing area 93 Third air blowing area 95 Air guide plate L1 First L-shape L2 Second L-shape

Claims (6)

A power generation engine, a muffler through which exhaust gas emitted from the power generation engine flows, a generator that generates electricity by driving the power generation engine, and a plurality of cooling fins to which electric power is supplied from the generator. In a cooling structure for a power generation unit for a range extender vehicle, the cooling structure includes an electrical device, a pedestal on which the electrical device is installed, and a cooling fan capable of blowing cooling air to the cooling fins,
The muffler is arranged adjacent to the electrical device,
The pedestal includes a heat shield plate that blocks heat radiation from the muffler to the electric device,
The cooling fan includes a first air blowing area in which the cooling fins are arranged, and a second air blowing area that is formed between the heat shield plate and the muffler outer wall surface in an area different from the first air blowing area. A cooling structure for a power generation unit for a range extender vehicle, characterized in that the cooling structure is configured to face a ventilation area and to individually blow cooling air to the first ventilation area and the second ventilation area. . The electrical device has a main body to which the cooling fin is attached,
The cooling structure for a power generation unit for a range extender vehicle according to claim 1, wherein the cooling fan is configured to be able to blow air into a third air blowing area where the main body is arranged. The power generation engine, the muffler, the generator, the electrical equipment, and the cooling fan are housed in a housing structure having a substantially rectangular tray extending in the vehicle width direction,
The muffler extends in the vehicle width direction, and a side portion of the muffler in the vehicle width direction is disposed at a corner portion of the tray on the vehicle front side,
An exhaust pipe extending along the air blowing direction of the cooling fan is attached to a side part of the muffler located at the corner,
The exhaust pipe and the muffler form a first L-shape when viewed from above,
The cooling structure for a power generation unit for a range extender vehicle according to claim 1 or 2, wherein the electric device is disposed above the muffler in the vehicle via the heat shield plate. The power generation engine has a piston that is disposed at an intermediate portion in the vehicle width direction of the housing structure and extends in the vehicle longitudinal direction,
The generator is arranged adjacent to the rear part of the power generation engine in the vehicle width direction,
The rotating shaft of the generator extends in the vehicle width direction,
The rotating shaft and the piston form a second L-shape when viewed from above,
The cooling structure for a power generation unit for a range extender vehicle according to claim 3, wherein the first L-shaped corner and the second L-shaped corner are arranged to face each other. . The heat shield plate extends in the vehicle width direction along the muffler,
Side walls extending in the vehicle vertical direction are provided on both sides of the heat shield in the vehicle width direction,
A notch is formed in one of the side walls so as to surround the muffler,
The microwave oven according to any one of claims 1 to 4, wherein the second air blowing area is provided below the heat shield plate and between the side walls on both sides. Cooling structure for power generation unit for extender vehicles. The range extender according to any one of claims 1 to 5, wherein an exhaust fan is provided downstream of the first ventilation area and the second ventilation area. Cooling structure for vehicle power generation units.