JP2022072235A - Cooling structure of range extender vehicular power generation unit - Google Patents

Abstract

To efficiently cool a range extender vehicular power generation unit that generates power by a power generation engine.SOLUTION: A cooling structure of a power generation unit has a power generation engine, a muffler 30, a power generator, an inverter 50, and a pedestal 40. The muffler 30 is adjacent to the inverter 50. The pedestal 40 includes a heat insulation plate 45 shielding heat radiation from the muffler 30 to the inverter 50. A cooling fan 55 faces a first ventilation area 91 in which a cooling fin 53 of the inverter 50 is disposed, and a second ventilation area 92 formed between the heat insulation plate 45 and an outer wall surface of the muffler 30, and blows cooling air individually to the first ventilation area 91 and the second ventilation area 92.SELECTED DRAWING: Figure 6

Description

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

As an electric vehicle driven by an electric motor, a vehicle equipped with a small generator is known. The small generator has, for example, an engine for power generation, and can generate electric power by the engine for power generation and supply electric power to an electric vehicle. By supplying electric power to the electric motor of the electric vehicle, the small generator can extend the cruising range of the electric vehicle, for example. As such a small generator, for example, the device disclosed in Patent Document 1 is known.

The small generator generates electricity by a power generation engine and has an inverter or the like. Further, a small generator requires a cooling structure for cooling a power generation engine, an electric device such as an inverter, and the like.

Japanese Unexamined Patent Publication No. 2010-7599

In a power generation unit equipped with a generator that generates electric power by driving a power generation engine, electric power is supplied to an electric device such as an inverter by the generator. Further, in such a power generation unit, heat is generated by the operation of the power generation engine, so that it is necessary to efficiently dissipate heat to the outside of the power generation unit.

A muffler is usually connected to the power generation engine. In order to reduce the size of the power generation unit, it is preferable that the muffler and electrical equipment such as an inverter are housed inside the power generation unit. The temperature around the muffler rises due to the heat dissipation of the muffler when the power generation engine is driven. When an attempt is made to cool an electric device such as an inverter in a power generation unit by applying the configuration of the above example, the cooling efficiency may decrease due to heat dissipation of the muffler. Therefore, in the structure as in the above example, there is room for improvement in reducing the size of the power generation unit on which the power generation engine is mounted and efficiently cooling the inside.

The present invention has been made to solve the above problems, and an object thereof is a power generation unit for a range extender vehicle capable of downsizing the power generation unit generated by a power generation engine and efficiently cooling the inside. Is to provide a cooling structure for.

The cooling structure of the power generation unit for a range extender vehicle according to the present invention for achieving the above object is formed by driving a power generation engine, a muffler through which exhaust gas emitted from the power generation engine flows, and the power generation engine. A generator that generates electricity, an electric device to which power is supplied from the generator and provided with a plurality of cooling fins, a pedestal on which the electric 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 range extender vehicle power generation unit, the muffler is arranged adjacent to the electric device, and the pedestal includes a heat shield plate that blocks heat radiation from the muffler to the electric device, and the cooling is performed. The fan has a first air blowing region in which the cooling fins are arranged and a second air blowing region formed between the heat shield plate and the outer wall surface of the muffler in a region different from the first air blowing region. Facing the region, it is configured to individually blow cooling air to the first blowing region and the second blowing region.

According to the present invention, it is possible to reduce the size of the power generation unit that generates power by the power generation engine and to efficiently cool the inside.

It is a top view which shows one Embodiment of the cooling structure of the power generation unit which concerns on this invention. FIG. 3 is a perspective view of the power generation unit of FIG. 1 as viewed from the front side of the vehicle. FIG. 3 is a perspective view of the inverter and muffler of FIG. 2 as viewed from the rear side of the vehicle. FIG. 3 is a schematic cross-sectional view taken along the line AA of FIG. FIG. 3 is an enlarged cross-sectional view showing the periphery of the cooling fan of FIG. 4 in an enlarged manner. It is a schematic cross-sectional view of BB arrow view of FIG.

Hereinafter, an embodiment of the cooling structure of the 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 the figure, the arrow Fr direction indicates the front in the front-rear direction of the vehicle. The "front (front end) and rear (rear end)" in the description of the embodiment correspond to the front and rear parts in the front-rear direction of the vehicle. Further, the arrows R and L indicate the right side and the left side in the vehicle width direction, respectively, and the "left and right" in the present embodiment correspond to the "left side" and the "right side" when the occupant faces the front of the vehicle. There is.

The power generation unit 1 for the range extender vehicle of the present embodiment is, for example, a power generation unit 1 that is detachably attached under the floor such as a luggage space provided at the rear of the vehicle, and is a substantially rectangular parallelepiped extending in the vehicle width direction as a whole. It is a state. In this case, the power generation unit 1 is fixed to the rear part of the vehicle, for example, in a state of being inserted into the vehicle through an opening provided in the rear part of the vehicle.

As shown in FIGS. 1 and 2, the power generation unit 1 of the present 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-mentioned devices and members are housed.

The containment structure 10 has a tray 11 and an upper lid (not shown). The tray 11 has an installation surface portion 12 and a side wall portion 15. The installation surface portion 12 has a substantially rectangular shape extending in the vehicle width direction, and the above-mentioned power generation engine 20, fuel tank 25, muffler 30, pedestal 40, generator 60, cooling device 70, and the like are installed on the installation surface portion 12. ing. The side wall portion 15 is a vertical wall protruding upward from both ends of the installation surface portion 12 in the vehicle width direction and extends in the front-rear direction of the vehicle. A side flange 16 projecting outward in the vehicle width direction and extending in the vehicle front-rear direction is provided on the upper portion of the side wall portion 15, and a handle 17 or the like used for installation work, transportation, or the like is provided on the upper surface of the side flange portion 16. It is provided. Although not shown, the upper lid is a substantially rectangular parallelepiped box shape that covers the installation surface portion 12 of the tray 11 from above the vehicle, and the tray is located so that the side portion of the upper lid is located slightly inside the handle 17, for example. Attached to 11.

The power generation engine 20 has a cylinder case 21 for accommodating a cylinder (not shown), a piston (not shown), and the like, and a crankcase 23 for covering the crankshaft 23a. In the present embodiment, the detailed illustration of the piston is omitted, but in FIG. 1, the sliding direction of the piston is indicated by an arrow A. Further, with respect to the crankshaft 23a, the approximate position is virtually shown in FIG. The crankcase 23 is a member extending in the vehicle width direction, and is arranged at a substantially central portion in the vehicle width direction at the rear portion of the installation surface portion 12 of the tray 11. The crankshaft 23a is housed inside the crankcase 23 in a state of extending in the vehicle width direction. Further, the piston is housed inside the cylinder case 21 in a state of extending in the front-rear direction of the vehicle, and reciprocates in the front-rear direction of the vehicle (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, and the upper surface of the fuel tank 25 is flat, and an opening (not shown) for refueling is provided on the upper surface. It is provided. A cap 26 that can be removed during refueling is attached to the opening. The fuel tank 25 is arranged at the right front corner of the installation surface portion 12 of the tray 11 of the accommodation structure 10.

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

As shown in FIGS. 1, 3 and 4, the side portion of the muffler 30 located at the corner, that is, the right portion of the rear side surface of the muffler 30 in the vehicle width direction is a substantially cylinder extending in the vehicle front-rear direction. The shape of the exhaust pipe 32 is attached. Exhaust gas flowing through the muffler 30 flows into the exhaust pipe 32, and the inflowing exhaust gas is exhausted from the rear part of the exhaust pipe 32 to the outside of the power generation unit 1. The exhaust pipe 32 will be described later.

As shown in FIGS. 1 and 2, the generator 60 is a device extending 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 portion 12. The generator main body 61 has a rotary shaft 62 extending in the vehicle width direction, and the rotary shaft 62 is connected to the left side portion of the crankshaft 23a. In this embodiment, the rotation shaft 62 virtually shows the approximate position in FIG. The generator 60 generates electricity by rotating the rotating shaft 62 by driving the power generation engine 20. Further, cooling water pipes 81 and 82 through which cooling water (refrigerant) flowing through the radiator 71, which will be described later, flows are connected to the generator main body 61.

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 has a vertical wall extending upward from the installation surface portion 12 and facing the vehicle width direction. The vertical wall is arranged between the exhaust pipe 32 and the generator main body 61, and the left side portion of the generator main body 61 is joined to the vertical wall by 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 arranged near the rear end of the installation surface portion 12. The cooling device 70 is provided with an engine interlocking fan (not shown) for cooling the cylinder case 21 and the inside thereof, and a radiator 71.

The engine interlocking fan is attached to the right side portion of the crankshaft 23a in the vehicle width direction via a speed reducer or the like (not shown), and rotates coaxially in conjunction with the crankshaft 23a. The cooling air generated by the rotation of the engine interlocking fan is blown to, for example, the cylinder case 21.

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 pipes include a feed-side pipe 81 that sends out cooling water cooled inside the radiator 71, and a return-side pipe that returns the cooled water whose heat has been exchanged outside the radiator 71 to the radiator 71. (Not shown) and.

Subsequently, the pedestal 40 will be described. The pedestal 40 is a substantially rectangular parallelepiped hollow member that covers the muffler 30 from the upper side of the vehicle. The front wall 41 of the pedestal 40 extends in the vertical direction of the vehicle, faces the front of the vehicle, and is arranged near the front end of the installation surface portion 12. The left side wall 43 of the pedestal 40 extends in the vertical direction of the vehicle, extends from the left end of the front wall 41 to the rear of the vehicle, and is arranged adjacent to the side wall portion 15 on the left side of the tray 11. The right side wall 42 of the pedestal 40 extends in the vertical direction of the vehicle, and extends from the right end of the front wall 41 to the rear of the vehicle.

Further, the right side wall 42 is provided with a notch 44 having a substantially semicircular shape 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 so as 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 arranged 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 front-rear direction of the vehicle. The heat shield plate 45 is arranged at an interval above the vehicle with respect to the upper end of the outer wall surface of the muffler 30. In the heat shield plate 45 of this example, as shown in FIGS. 4 to 6, two horizontally arranged flat plates (upper plate 45A and lower plate 45b) are arranged at intervals 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 the heat released from the outer wall surface of the muffler 30 from being transferred to the inverter 50 or the like.

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

As shown in FIGS. 4 to 6, the cooling water tank 52 is a substantially rectangular parallelepiped tank extending in the front-rear direction of the vehicle, is inserted inside the tank installation hole, and is in contact with the upper 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 feed side pipe 81 is a pipe for flowing the cooling water cooled by the radiator 71 into the cooling water tank 52. The outflow side pipe 82 is a pipe for flowing out the heat-exchanged cooling water in the cooling water tank 52 from the cooling water tank 52 to the radiator 71 via the generator 60 or the like.

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

As shown in FIGS. 1, 2, and 6, the cooling fan 55 is provided in the front portion of the main body 51 of the inverter 50. The position of the upper end of the cooling fan 55 in the vertical direction of the vehicle is arranged so as to be substantially aligned with the upper end of the main body 51. 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 the first to third blowing regions 91 to 93, which will be described later.

Here, the ventilation region 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 the present embodiment has three blowing regions, that is, a first blowing region 91, a second blowing region 92, and a third blowing region 93. There is.

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

As shown in FIGS. 4 and 6, the third ventilation region 93 is a region above the main body 51 and is a region around a portion covering an electric component. A baffle plate 95 is provided at the front of the third blower region 93. The baffle plate 95 extends inclined upward from the middle portion of the cooling fan 55 in the vertical direction of the vehicle toward the rear of the vehicle. The lower end of the baffle plate 95 is arranged on the upper side of the vehicle with respect to the second blower region 92. In the present embodiment, the third blowing region 93, the first blowing region 91, and the second blowing region 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 the first blowing region 91, the second blowing region 92, and the third blowing region 93. That is, the cooling fan 55 is provided in front of the first to third ventilation regions 91 to 93, and is individually cooled in the first ventilation region 91, the second ventilation region 92, and the third ventilation region 93. It is configured to blow air.

The cooling air flowing through the first ventilation region 91 flows along the arrows X1 in FIGS. 4 and 6, and is heat-exchanged with the cooling fins 53, so that the temperature of the cooling air rises. As a result, the cooling fins 53 are cooled. The cooling air flowing through the second ventilation region 92 flows along the arrows X2 in FIGS. 4 and 6, and is heat-exchanged with the outer wall surfaces of the heat shield plate 45 and the muffler 30, and the temperature of the cooling air rises. As a result, the outer wall surface of the muffler 30 and the like are cooled. Further, the cooling air flowing through the third ventilation region 93 cools the main body 51 whose temperature has risen due to the electric components.

Generally, by arranging an electric device such as an inverter 50 away from an exhaust system having a muffler 30 for noise reduction, it is possible to suppress an increase in the temperature of the electric device due to heat dissipation from the exhaust system. can. However, in this case, the layout is limited.

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

With such a configuration, it is possible to effectively cool the electric equipment and the like without arranging the electric equipment such as the inverter 50 separately in the exhaust system, and it is possible to arrange the members and the like constituting the power generation unit 1 more compactly. It can be done, and the degree of freedom of layout is improved.

Further, by further providing a third ventilation region 93 as a region separate from the first and second ventilation regions 91 and 92, the air is blown by the cooling fan 55 to the arrows X3 and X4 in FIGS. 4 and 6. Since it flows along the flow and flows not only to the cooling fins 53 but also to the periphery of the main body 51 of the inverter 50, the ambient temperature of the inverter 50 can be lowered, and more effective cooling becomes possible.

Further, in the present 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 blowing direction of the cooling fan 55. The exhaust pipe 32 and the muffler 30 virtually form the first L-shaped L1 when viewed from above. In FIG. 1, the first L-shaped L1 is shown by a broken line. The electric equipment such as the inverter 50 is arranged above the vehicle of the muffler 30 via the heat shield plate 45 and above the corner of the first L-shaped L1.

The above configuration is a layout corresponding to the corner of the accommodation structure 10 of the rectangular parallelepiped power generation unit 1, and a member serving as a heat source is arranged along the vicinity of the outer wall of the upper lid (not shown) of the power generation unit 1. Further, by setting the flow direction in the exhaust pipe 32 constituting the first L-shaped L1 to the same direction as the cooling direction, it is possible to efficiently perform scavenging around the heat source downstream of the muffler 30. Further, by arranging an electric device such as an inverter 50 on the upper side of the vehicle at the corner of the first L-shaped L1, it is possible to reduce the circulation of air whose temperature has risen due to the exhaust system around the inverter 50 or the like. Become.

As described above, the power generation engine 20 of the present embodiment is arranged at the intermediate portion in the vehicle width direction of the installation surface portion 12 of the tray 11 of the accommodation structure 10, the piston extends in the vehicle front-rear direction, and the crankshaft 23a is provided. It is arranged so as to extend in the vehicle width direction. That is, as shown in FIG. 1, a second L-shaped L2 is virtually formed by the piston and the crankshaft 23a when viewed from above. In FIG. 1, the second L-shaped shape L2 is shown by a broken line like the first L-shaped shape. In the present embodiment, the corners of the first L-shaped L1 and the corners of the second L-shaped L2 are arranged to face each other. In this example, the first L-shaped shape L1 and the second L-shaped shape L2 form a rectangle in a top view.

By arranging the power generation engine 20 and the generator 60 so as to form the above-mentioned second L-shaped L2, the cooling and scavenging of the exhaust system forming the above-mentioned first L-shaped L1 can be hindered. It suppresses and enables a more compact layout.

Further, the heat shield plate 45 of the present 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, the 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 ventilation direction, it is possible to suppress the diffusion of hot air to electrical equipment such as the inverter 50, and the cooling air flowing inside the second ventilation region 92. Efficiently flows toward the exhaust port provided on the downstream side of the second ventilation region 92, and the second ventilation region 92 is efficiently scavenged.

Further, by providing a notch 44 surrounding the muffler 30 on the left side wall 43, for example, even when the volume of the muffler 30 is set large in order to reduce noise, the width of the pedestal 40 is such that the inverter 50 or the like is installed. It is possible to prevent the width from being exceeded, and as a result, the pedestal 40 can be made more compact. Also. By providing the notch 44 having a semicircular shape (arch shape), the weight of the pedestal 40 can be reduced, and the rigidity of the pedestal 40 is ensured by the reinforcement with the pedestal. As a result, even in a device having a large weight such as the inverter 50 of the present embodiment having a cooling water tank 52, it is possible to secure rigidity for reducing vibration in the vertical direction of the vehicle during vehicle operation.

Further, as shown in FIG. 1, the power generation unit 1 of the present embodiment includes an exhaust fan 35. The exhaust fan 35 is provided on the downstream side of the first ventilation region 91 and the second ventilation region 92, and the air inside the power generation unit 1 including the ventilation regions 91, 92, 93 is taken out of the power generation unit 1. Exhaust. In this example, the exhaust fan 35 is arranged on the left side at the rear end of the power generation unit 1 so as to be adjacent to the generator 60. By providing the exhaust fan 35 on the downstream side in the ventilation direction, the air whose temperature has risen in the ventilation 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 the present 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 described in the claims.

For example, in the present embodiment, the cooling fan 55 is configured to blow air to all the ventilation regions of the first to third ventilation regions 91, 92, 93, but the present invention is not limited to this. The third ventilation region 93 may be cooled by a fan separately provided. In this case, it is advisable to provide an intake fan on the top surface of the upper lid (not shown) of the accommodation structure. Further, in the present embodiment, the power generation unit 1 attached to the rear portion of the vehicle is described, but 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 Containment structure 11 Tray 12 Installation surface 15 Side wall 16 Side flange 17 Handle 20 Power generation engine 21 Cylinder case 23 Crankcase 23a Crankshaft 25 Fuel tank 26 Cap 30 Muffler 31 Connection piping 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 fin 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 ventilation area 92 Second Blower region 93 Third blower region 95 Blower plate L1 First L-shaped shape L2 Second L-shaped shape

Claims (6)

An engine for power generation, 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 power is supplied from the generator, and a plurality of cooling fins are provided. In the cooling structure of a power generation unit for a range extender vehicle, which is provided with an electric device, a pedestal on which the electric device is installed, and a cooling fan capable of blowing cooling air into the cooling fins.
The muffler is arranged so as to be adjacent to the electric device.
The pedestal includes a heat shield that blocks heat radiation from the muffler to the electrical equipment.
The cooling fan is a second region formed between the heat shield plate and the outer wall surface of the muffler in a region different from the first ventilation region in which the cooling fins are arranged and the first ventilation region. The cooling structure of the power generation unit for a range extender vehicle, which faces the ventilation region of the above and is configured to individually blow cooling air to the first ventilation region and the second ventilation region. .. The electrical device has a main body to which the cooling fins are 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 blowing region in which the main body portion is arranged. The power generation engine, the muffler, the generator, the electric equipment, and the cooling fan are housed in a housing structure having a substantially rectangular tray extending in the vehicle width direction.
The muffler is extended in the vehicle width direction, and the side portion of the muffler in the vehicle width direction is arranged at the corner portion on the vehicle front side of the tray.
An exhaust pipe extending along the air blowing direction of the cooling fan is attached to the side portion of the muffler located at the corner portion.
The exhaust pipe and the muffler form a first L-shape in top view.
The cooling structure for a power generation unit for a range extender vehicle according to claim 1 or 2, wherein the electric device is arranged above the vehicle of the muffler via the heat shield plate. The power generation engine is arranged in the vehicle width direction middle portion of the accommodation structure and has a piston extending in the vehicle front-rear direction.
The generator is arranged at the rear of the power generation engine so as to be adjacent to 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 in top view.
The cooling structure for a power generation unit for a range extender vehicle according to claim 3, wherein the first L-shaped corner portion and the second L-shaped corner portion are arranged so as to face each other. .. The heat shield plate extends in the vehicle width direction along the muffler and extends.
On both sides of the heat shield plate in the vehicle width direction, side walls extending in the vehicle vertical direction are provided.
One of the side walls is formed with a notch so as to surround the muffler.
The range according to any one of claims 1 to 4, wherein the second ventilation region is provided below the heat shield plate and between the side walls on both sides. Cooling structure of the power generation unit for the extender vehicle. The range extender according to any one of claims 1 to 5, wherein an exhaust fan is provided on the downstream side of the first ventilation region and the second ventilation region. Cooling structure of the power generation unit for vehicles.

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