JP7379971B2 - 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, an electric device such as the inverter, and the like.

Japanese Patent Application Publication No. 2008-169114

A small-sized generator like the above example generates heat by operating the power generation engine, so it is necessary to reduce the size and dissipate heat efficiently. However, in the structure shown in the above example, the space between the devices constituting the power generation unit is used as a cooling passage, and air is caused to flow through the cooling passage in an attempt to lower the ambient temperature. As a result, a large amount of air flows into the space around devices that do not require high cooling performance (devices that generate a low amount of heat), or into the space around devices that require high cooling performance (devices that generate a large amount of heat). On the other hand, there is a possibility that the amount of air flowing will decrease. Therefore, in the structure as in the above example, there is room for improvement in cooling electrical equipment such as a power generation engine and an inverter.

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

To achieve the above object, a cooling structure for a power generation unit for a range extender vehicle according to the present invention includes a power generation engine, a fuel tank filled with fuel for driving the power generation engine, and a fuel tank filled with fuel that drives the power generation engine. The engine includes a muffler through which exhaust gas flows, and an inverter that is supplied with electric power generated by the power generation engine and is provided with heat radiation fins. In the cooling structure of the power generation unit for a range extender vehicle, the cooling air passes through a first cooling system through which cooling air flows from the power generation engine toward the muffler, and through the radiation fins of the inverter toward the muffler. a second cooling system that flows, and the first cooling system and the second cooling system are arranged to intersect with each other.

According to the present invention, it is possible to efficiently cool a power generation unit that generates power using a power generation engine mounted on a range extender vehicle.

1 is a plan view showing an embodiment of a cooling structure for a power generation unit for a range extender vehicle according to the present invention. FIG. 2 is a side view of the power generation unit of FIG. 1 viewed from the left side in the vehicle width direction. A cross-sectional view taken along the line AA in FIG. 1 shows the second cooling system. A cross-sectional view taken along line BB in FIG. 1 shows the second cooling system. FIG. 2 is a plan view showing a state in which the cover member of the muffler in FIG. 1 is removed. FIG. 7 is a perspective view showing a state in which the cylinder case and the like of FIG. 6 are removed. FIG. 7 is a perspective view showing a state in which a communication component is attached between the power generation engine and the muffler of FIG. 6; FIG. 2 is a schematic perspective view showing members constituting the first cooling system in FIG. 1. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the cooling structure for a power generation unit for a range extender vehicle according to the present invention will be described with reference to the drawings (FIGS. 1 to 8).

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.

As shown in FIG. 1, the cooling structure of the power generation unit 1 for a range extender vehicle according to the present embodiment has two cooling systems, that is, a first cooling system 11 and a second cooling system 12. . First, the configuration of the power generation unit 1 will be explained. The power generation unit 1 of this embodiment includes a power generation engine 20, a fuel tank 30, a muffler 50, an inverter 35, and a generator 38 (power generation section). Further, the power generation unit 1 is arranged within an area surrounded by a frame 2 having a substantially rectangular parallelepiped shape.

The generator 38 is connected to the right side of the power generation engine 20 in the vehicle width direction, and generates power when the power generation engine 20 is driven. A radiator 39 and an inverter 35 are connected to the generator 38.

The fuel tank 30 is a tank filled with fuel for driving the power generation engine 20, and is disposed on the right side of the power generation engine 20 in the vehicle width direction, as shown in FIG. A cap 30a is attached to the upper wall surface 31 of the fuel tank 30 to close an opening (not shown) for replenishing fuel. A recess 32 recessed downward from the vehicle is provided on the left side of the upper wall surface 31 of the fuel tank 30. That is, as shown in FIG. 4, the fuel tank 30 is configured such that the upper left corner of the fuel tank 30 is cut out toward the lower side of the vehicle when viewed in the longitudinal direction of the vehicle.

The recess 32 of the fuel tank 30 extends in the longitudinal direction of the vehicle and is recessed with respect to the upper wall surface 31 of the fuel tank 30 so as to form a step. The bottom surface 32a of the recess 32 is arranged between the upper wall surface 31 of the fuel tank 30 and the lower surface of the fuel tank 30 in the vehicle vertical direction.

As shown in FIGS. 1 and 2, the muffler 50 is connected to the power generation engine 20 via a connection pipe 28, which will be described later. It flows in and releases to the outside. The muffler 50 includes a muffler main body 51 and a cover member 53, the details of which will be explained later.

As shown in FIGS. 1, 3, and 4, the inverter 35 is a substantially rectangular parallelepiped device that is fixed to the recess 32 of the fuel tank 30 and extends in the longitudinal direction of the vehicle, and is electrically connected to the generator 38. . A plurality of heat radiation fins 36 are provided at the bottom of the inverter 35. Each of the heat radiation fins 36 protrudes downward from the lower part of the inverter 35 and extends in the longitudinal direction of the vehicle, and the plurality of heat radiation fins 36 are spaced apart from each other in the vehicle width direction.

First, details of the first cooling system 11 will be explained. The first cooling system 11 is configured so that cooling air flows from the power generation engine 20 toward the muffler 50. The first cooling system 11 includes a power generation engine 20, a muffler 50, and a communication passage component 40.

Here, the configuration of the power generation engine 20 will be explained. As shown in FIGS. 1, 2, and 6, the power generation engine 20 includes a cylinder case 22 that houses the cylinder portion 21, a connecting pipe 28, a crankshaft 24 (FIG. 6), and a cylinder case 22 that covers the crankshaft 24. It has a crankcase 23 and a first cooling fan 25.

The power generation engine 20 is arranged such that the crankshaft 24 extends in the vehicle width direction. The crankcase 23 surrounds the crankshaft 24 and extends in the vehicle width direction. The first cooling fan 25 is attached to the left end of the crankshaft 24 in the vehicle width direction via a reduction gear or the like, and rotates as the crankshaft 24 rotates. Further, the first intake port 27 provided in the first cooling fan 25 is arranged so as to face the left outer side in the vehicle width direction. In this example, the first intake port 27 is arranged on the left outer side of the power generation unit 1 in the vehicle width direction.

The cylinder case 22 is arranged in line with the crankcase 23 on the rear side of the vehicle, and extends in the vehicle width direction. An opening 22a for exhausting air within the cylinder case 22 is provided at the right end of the cylinder case 22 in the vehicle width direction (FIG. 7). Further, a fan cover 26 that covers the first cooling fan 25 is attached to the left side of the crank case 23 and the cylinder case 22 in the vehicle width direction. The fan cover 26 extends in the longitudinal direction of the vehicle and is connected to the left end of the cylinder case 22 in the vehicle width direction so as to communicate fluidly therewith. Air taken in by the first cooling fan 25 passes through the inside of the fan cover 26 and flows into the inside of the cylinder case 22.

A plurality of cooling fins 21a are provided on the outer surface of the cylinder portion 21 of the power generation engine 20. For example, as shown in FIG. 6, the plurality of cooling fins 21a provided on the upper surface of the cylinder portion 21 protrude upward from the upper surface of the cylinder portion 21 and are spaced apart from each other in the longitudinal direction of the vehicle. 50 longitudinal direction).

The communication pipe 28 is connected to a muffler body 51 of the muffler 50, which will be described later. Exhaust gas generated when the power generation engine 20 is driven flows through the communication pipe 28, flows into the muffler body 51, and is exhausted from the muffler body 51 to the outside.

The muffler 50 includes a muffler main body 51 and a cover member 53. The muffler main body 51 is a long member extending in the vehicle width direction, and has a catalyst etc. inside, and as shown in FIGS. It has a lower surface 51c, a front wall surface 51b facing the front of the vehicle, and a rear wall surface 51d facing the rear of the vehicle. The front wall surface 51b and the rear wall surface 51d extend substantially perpendicularly to the lower surface 51c.

A communication pipe 28 is connected to the left end of the muffler body 51 in the vehicle width direction, and an outer exhaust pipe 52 through which exhaust gas is exhausted to the outside is provided at the right end in the vehicle width direction. As shown in FIG. 8, the outer exhaust pipe 52 extends from the right end of the muffler body 51 to the right outer side in the vehicle width direction, and is curved toward the lower side of the vehicle. The outer exhaust pipe 52 is provided with an exhaust port (not shown) that faces downward from the vehicle.

As shown in FIGS. 3 and 8, the cover member 53 has a hollow, substantially rectangular parallelepiped shape, and the muffler main body 51 is accommodated therein. The cover member 53 extends in the vehicle width direction along the longitudinal direction of the muffler body 51, is open at both ends in the vehicle width direction, and is formed of heat shield plates (inner heat shield plate 53A, outer heat shield plate 53B). . The left end of the cover member 53 in the vehicle width direction is arranged in line with and faces the opening 22a of the cylinder case 22 in the vehicle width direction. In this example, the opening 22a of the cylinder case 22 is located at the upper part of the opening at the left end of the cover member 53.

The inner heat shield plate 53A has an upper surface portion 53a and a front surface portion 53b extending downward from the vehicle from the front end of the upper surface portion 53a. The upper surface portion 53a is arranged at a distance above the vehicle from the upper surface 51a of the muffler main body 51, and the front surface portion 53b is arranged at a distance from the front wall surface 51b of the muffler main body 51 toward the front side of the vehicle. has been done.

The outer heat shield plate 53B has a lower surface portion 53c and a rear surface portion 53d extending upward from the rear end of the lower surface portion 53c. The lower surface portion 53c is spaced from the lower surface 51c of the muffler main body 51 toward the lower side of the vehicle, and the rear surface portion 53d is spaced from the rear wall surface 51d of the muffler main body 51 toward the rear of the vehicle. has been done. The muffler main body 51 is supported on the lower surface portion 53c, front surface portion 53b, rear surface portion 53d, etc. of the cover member 53 via a bracket or the like. As a result, the distance between the upper surface 53a, front surface 53b, lower surface 53c, and rear surface 53d of the cover member 53 and the upper surface 51a, front wall surface 51b, lower surface 51c, and rear wall surface 51d of the muffler main body 51 is maintained. There is.

Further, as shown in FIG. 3, a flange 53f that protrudes upward from the vehicle is provided at the rear part of the upper surface part 53a of the inner heat shield plate 53A, and the flange 53f is attached to the upper part of the rear surface part 53d of the outer heat shield plate 53B. It is connected to the base with bolts, etc. Although not shown, the lower part of the front surface part 53b of the inner heat shield plate 53A and the front part of the lower face part 53c of the outer heat shield plate 53B are joined.

The communication passage component 40 is an annular member that connects the left end of the cover member 53 in the vehicle width direction and the opening 22a of the cylinder case 22, and is made of light metal, heat-resistant resin material, or the same material as the cover member 53. It is formed by a heat shield plate or the like. The communication passage component 40 extends in the vehicle width direction, closes the opening at the left end of the cover member 53, and closes the opening 22a of the cylinder case 22.

As shown in FIG. 7, the upper part of the communication passage component 40 connects the left end of the upper surface part 53a of the cover member 53 and the upper part of the opening 22a, and extends from the opening 22a toward the cover member 53 in the longitudinal direction of the vehicle. It is designed to be wide.

Similarly, the front part of the communicating passage component 40 connects the left end of the front part 53b of the cover member 53 and the front side part of the opening 22a. The front portion is inclined toward the front of the vehicle as it goes from the opening 22a toward the cover member 53. Further, the lower part of the communication passage component 40 connects the left end of the lower surface part 53c of the cover member 53 and the lower part of the opening 22a, and is inclined toward the lower side of the vehicle as it goes from the opening 22a to the cover member 53. .

Further, the rear portion of the communication component 40 connects the left end of the rear surface portion 53d of the cover member 53 and the rear side portion of the opening 22a. In this embodiment, the communication pipe 28 is disposed through the rear part of the communication passage component 40 in a sealed state.

As shown in FIG. 3, the intervals between the top surface 53a, front surface 53b, bottom surface 53c, and rear surface 53d of the cover member 53 and the top surface 51a, front wall surface 51b, bottom surface 51c, and rear wall surface 51d of the muffler main body 51. constitutes a first cooling passage 58 through which air flows. Air exhausted from the opening 22a of the cylinder case 22 flows into the first cooling passage 58 via the communication passage component 40.

Here, the flow of air in the first cooling system 11 will be explained. Air taken in from the first intake port 27 by the first cooling fan 25 passes through the inside of the fan cover 26 and flows into the inside of the cylinder case 22 . At this time, air is blown onto the plurality of cooling fins 21a on the outer surface of the cylinder portion 21. The air blown onto the cooling fins 21a flows between adjacent cooling fins 21a along the longitudinal direction (vehicle width direction) of the cooling fins 21a, thereby cooling the cooling fins 21a.

The air that has passed between the cooling fins 21 a of the cylinder portion 21 is exhausted from the opening 22 a of the cylinder case 22 and flows into the communication passage component 40 . The air flowing inside the communication passage component 40 flows through the first cooling passage 58 formed between the cover member 53 and the muffler body 51, cools the muffler body 51, and is exhausted from the opening at the right end of the cover member 53. The gas is further diffused and exhausted to the outside of the power generation unit 1, for example.

Next, details of the second cooling system 12 will be explained. The second cooling system 12 is configured so that cooling air flows toward the muffler 50 through the radiation fins 36 of the inverter 35 . The second cooling system 12 includes a first air guide duct 61 and a second air guide duct 64, as shown in FIGS. 3 and 4. The first air guide duct 61 is attached to the upper part of the fuel tank 30 so as to cover a part of the upper wall surface 31 of the fuel tank 30 and the radiation fins 36 of the inverter 35 . The second air guide duct 64 is connected to the first air guide duct 61 and is attached to the upper part of the fuel tank 30 so as to cover a part of the upper wall surface 31 of the fuel tank 30.

The first air guide duct 61 extends in the longitudinal direction of the vehicle, is disposed in the recess 32 provided in the upper wall surface 31 of the fuel tank 30, and covers the recess 32 from above the vehicle. A front portion of the first air guide duct 61 projects further toward the front of the vehicle than the front end of the fuel tank 30, and a second cooling fan 63 is provided at the front portion.

The first air guide duct 61 has an upper surface portion 61a, a right wall portion 61b, and a left wall portion 61c. The upper surface portion 61a has a flat plate shape, and is disposed at a position corresponding to the upper wall surface 31 of the fuel tank 30, or slightly above the vehicle, as shown in FIG. Further, as shown in FIG. 3, the width of the intermediate portion of the upper surface portion 61a in the longitudinal direction of the vehicle (length in the vehicle width direction) is larger than the width of the front portion. In this example, the right end of the upper surface portion 61a extends linearly in the longitudinal direction of the vehicle, and the left end thereof extends to the left in the vehicle width direction with respect to the front portion.

The right wall portion 61b protrudes downward from the right end of the upper surface portion 61a and extends in the longitudinal direction of the vehicle along the edge of the recess 32. In this example, the right wall portion 61b is provided so as to be continuous with the right vertical wall of the recess 32. The left wall portion 61c protrudes downward from the left end of the upper surface portion 61a, and is bent to correspond to the shape of the left end of the upper surface portion 61a.

A front portion of the first air guide duct 61 projects further toward the front of the vehicle than the front end of the fuel tank 30, and a second cooling fan 63 is provided at the front portion. Further, a second air intake port 62 through which outside air flows is provided at the front end of the first air guide duct 61 located on the vehicle front side of the second cooling fan 63 . The second intake port 62 is arranged so as to face the front of the vehicle. In this example, the second intake port 62 is arranged at the front of the power generation unit 1. As the second cooling fan 63 rotates, outside air is taken in from the second intake port 62.

The inverter 35 is attached to the upper surface portion 61a of the first air guide duct 61. For example, an opening is provided in the upper surface portion 61a, and the inverter 35 is attached to the opening. As shown in FIG. 3, the heat radiation fins 36 of the inverter 35 are arranged on the lower side of the vehicle on the upper surface portion 61a of the first air guide duct 61. As shown in FIG.

The second air guide duct 64 is inclined downward from the rear end of the first air guide duct 61 toward the rear of the vehicle. The second air guide duct 64 also has a top surface, a right wall, and a left wall, which are different from the top surface 61a, right wall 61b, and left wall 61c of the first air guide duct 61. It extends continuously from the rear end in the longitudinal direction of the vehicle. The rear part of the second air guide duct 64 projects further toward the rear of the vehicle than the rear end of the fuel tank 30, and the radiator 39 is disposed at the rear part. A second exhaust port 65 is provided at the rear end of the second air guide duct 64 and opens to face the cover member 53 of the muffler 50.

The first air guide duct 61 and the second air guide duct 64 cover the recess 32 of the fuel tank 30 from above the vehicle, and a second cooling passage 68 is formed therein. That is, the bottom surface 32a of the recess 32, the right vertical wall of the recess 32, the right wall 61b, the upper surface 61a and the left wall 61c of the first air guide duct 61, and the upper surface of the second air guide duct 64. , the right wall portion, and the left wall portion constitute a second cooling passage 68.

The second cooling passage 68 extends in the vehicle longitudinal direction. The radiation fins 36 of the inverter 35 are arranged inside the second cooling passage 68. The plurality of radiation fins 36 extend along the vehicle longitudinal direction along the air flow direction. The radiator 39 is arranged between the heat radiation fins 36 and the second exhaust port 65 in the air circulation direction (vehicle longitudinal direction) inside the second air guide duct 64 .

Air taken in from the second intake port 62 by the second cooling fan 63 flows into the second cooling passage 68 . At this time, air is blown onto the plurality of radiation fins 36 of the inverter 35. The air blown onto the radiation fins 36 passes between adjacent radiation fins 36 and cools the radiation fins 36. The air that has passed between the radiation fins 36 is blown onto the outer surface of the radiator 39 to cool the radiator 39. The air blown to the radiator 39 is blown from the second exhaust port 65 to the upper surface portion 53a of the cover member 53 of the muffler 50, thereby cooling the muffler 50. The air blown onto the upper surface portion 53a of the cover member 53 is, for example, diffused and exhausted to the outside of the power generation unit 1.

The first cooling system 11 makes it possible to cool a large amount of heat generated from the power generation engine 20 and the muffler 50 to an extent that does not exceed the endurance temperature of the machine such as the engine. The air that has cooled the cooling fins 21a of the cylinder section 21 of the power generation engine 20 has a high temperature, but the air that has flown through the first cooling system 11 has no effect on the power generation unit other than the members constituting the first cooling system 11. It is possible to discharge the power to the outside of the power generation unit 1 while suppressing the influence on the space in which the component members of the power generation unit 1 are arranged.

On the other hand, the second cooling system 12 can be cooled so as not to exceed the heat-resistant temperature of the inverter 35. At this time, since the second cooling fan 63 independent from the first cooling fan 25 of the first cooling system 11 is driven, the minimum amount of cooling air necessary for cooling the inverter 35 can be introduced. . That is, the area of the second cooling passage 68 of the second cooling system 12, the driving force of the second cooling fan 63, the driving timing, etc. can be appropriately adjusted to efficiently cool the inverter 35.

The first cooling system 11 is configured such that air flows along the longitudinal direction of the muffler 50 and cools the muffler 50 after cooling the power generation engine 20. It is configured to flow in a direction intersecting the longitudinal direction of the muffler 50 (in this example, approximately orthogonal), and after cooling the inverter 35, to flow toward the muffler 50.

The cooling system cools the power generation engine 20, which has a high temperature compared to other devices, and the muffler 50, which has a slightly lower temperature than the power generation engine 20, and finally cools the cooling air from an opening around the rear end of the muffler 50. It is desirable to discharge it outside the power generation unit 1. Therefore, in the present embodiment, in the first cooling system 11, the power generation engine 20 and the muffler 50 are arranged side by side in the vehicle width direction, and air flows along the longitudinal direction (vehicle width direction) of the muffler 50. Therefore, the power generation engine 20 and the muffler 50 can be efficiently cooled.

Furthermore, in order to cool the inverter 35, the cooling air needs to be kept at a lower temperature than the power generation engine 20 and the like. Therefore, it is desirable that the first cooling system 11 and the second cooling system 12 have less interference due to heat generation. In this embodiment, the first cooling system 11 and the second cooling system 12 are arranged independently of each other and intersect with each other. Specifically, since the flow directions intersect with each other, the first cooling system 11 and the second cooling system 12 The two cooling systems 12 can reduce mutual interference due to heat generation.

Further, both the downstream of the first cooling system 11 and the downstream of the second cooling system 12 are configured such that air flows toward the muffler 50, and the first cooling system 11 flows along the longitudinal direction of the muffler 50. While performing main cooling, the second cooling system 12 can flow toward the muffler 50 so as to intersect with the first cooling system 11 to assist in cooling the area around the muffler 50. Therefore, with the configuration according to this embodiment, the muffler 50 can be cooled more efficiently.

Further, in this embodiment, the first cooling system 11 and the second cooling system 12 are separated by a cover member 53 formed of a heat shield plate, and the air flowing through the first cooling system 11 is Air flowing through the first cooling passage 58 between the cover member 53 and the outer surface of the muffler body 51 and flowing through the second cooling system 12 is configured to flow outside the cover member 53.

The first cooling system 11 and the second cooling system 12 partition the flow around the muffler 50 with the inner heat shield plate 53A and the outer heat shield plate 53B. Cooling can be performed according to the requirements of each of the cooling systems 12.

In the first cooling system 11, since air flows through the first cooling passage 58, the muffler 50 can be uniquely cooled. On the other hand, in the second cooling system 12, cooling air is blown from the side to the outside of the inner heat shield plate 53A. Therefore, the temperature of the inner heat shield plate 53A can be lowered, so that the heat transferred from the first cooling system 11 to the inner heat shield plate 53A reduces heat radiation to the constituent members inside the power generation unit 1. This makes it possible to reduce the temperature rise of the component. By intersecting the air flows of the first cooling system 11 and the second cooling system 12 in this way, the air can be blown from the side, so that the inner heat shield plate 53A can be effectively cooled. .

Further, in this embodiment, the air taken in from the first cooling fan 25 disposed on the side facing outward in the vehicle width direction is configured to flow toward the power generation engine 20, and the air taken in from the second cooling fan 63 is configured to flow toward the power generation engine 20. The air is configured to flow toward the radiation fins 36 of the inverter 35.

The first cooling system 11 is an engine system cooling system and requires a large amount of air flow, so the first cooling fan 25 is constantly operated to continue sending cooling air to the power generation engine 20 and the like. Since the first cooling fan 25 is arranged so as to face the outside in the vehicle width direction, it is advantageous in introducing a large amount of air without being affected by mud, rainwater, etc. caused by steering of the vehicle.

On the other hand, in the second cooling system 12 that introduces the required amount of cooling air at the right time, sufficient cooling may be achieved even if the second cooling fan 63 is not driven by just the entry of the traveling wind. By arranging the second cooling fan 63 so as to face the front side of the vehicle, air can be taken into the second cooling system 12 efficiently.

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 power generation unit 1 is arranged in the inner region of the frame 2 assembled into a substantially rectangular parallelepiped shape, but the invention is not limited thereto. For example, the power generation unit 1 may be housed in a case. In this case, the exhaust port of the outer exhaust pipe 52 provided at the end of the muffler body 51 may be arranged on the outside of the case, and the exhaust port of the first cooling system 11 may be arranged so as to face the outside of the case. . Further, in this case, the second cooling system 12 may be provided with an exhaust port, for example, at the left end of the muffler 50, for exhausting the air that has cooled the cover member 53 of the muffler 50 to the outside of the case.

Further, in the present embodiment, the first cooling passage 58 is formed by covering the muffler main body 51 with the cover member 53 formed of the heat shield plates 53A and 53B, but the present invention is not limited to this. The tube bar member 53 may be removed and the muffler body 51 may be directly cooled by the first cooling system 11 and the second cooling system 12.

1 Power generation unit 2 Frame 11 First cooling system 12 Second cooling system 20 Power generation engine 21 Cylinder part 21a Cooling fins 22 Cylinder case 22a Opening 23 Crank case 24 Crank shaft 25 First cooling fan 26 Fan cover 27 First Intake port 28 Connection pipe 30 Fuel tank 31 Top wall surface 32 Recess 32a Bottom surface 35 Inverter 36 Radiation fins 38 Generator 39 Radiator 40 Communication passage parts 50 Muffler 51 Muffler body 51a Top surface 51b Front wall surface 51c Bottom surface 51d Rear wall surface 52 Outside exhaust pipe 53 Cover Member 53A Inner heat shield plate 53a Top part 53b Front part 53B Outer heat shield plate 53c Lower part 53d Rear part 53f Flange 58 First cooling passage 61 First air guide duct 61a Top part 61b Right wall part 61c Left wall part 62 2nd intake port 63 2nd cooling fan 64 2nd air guide duct 65 2nd exhaust port 68 2nd cooling passage

Claims (4)

A power generation engine, a fuel tank filled with fuel for driving the power generation engine, a muffler through which exhaust gas emitted from the power generation engine flows, and electric power generated by driving the power generation engine. In a cooling structure for a power generation unit for a range extender vehicle, the cooling structure includes: an inverter provided with heat dissipation fins;
a first cooling system in which cooling air flows from the power generation engine toward the muffler;
a second cooling system through which cooling air flows toward the muffler through the radiation fins of the inverter;
A cooling structure for a power generation unit for a range extender vehicle, wherein the first cooling system and the second cooling system are arranged to cross each other. The first cooling system is configured such that cooling air flows along the longitudinal direction of the muffler and cools the muffler after cooling the power generation engine,
The second cooling system is configured such that cooling air flows in a direction intersecting the longitudinal direction of the muffler, and after cooling the inverter, flows toward the muffler. A cooling structure for a power generation unit for a range extender vehicle according to item 1. Heat shield plates are provided on the outside of the muffler and are arranged at intervals on the outer surface of the muffler,
The first cooling system and the second cooling system are separated by the heat shield plate,
Cooling air of the first cooling system flows between the heat shield plate and the outer surface of the muffler,
Cooling of a power generation unit for a range extender vehicle according to claim 1 or 2, wherein the cooling air flowing through the second cooling system is configured to flow outside the heat shield plate. structure. The first cooling system includes a first intake port facing outward in the vehicle width direction, and a first cooling fan disposed inside the first intake port in the vehicle width direction. The generated air is configured to flow toward the power generation engine,
The second cooling system includes a second intake port facing the front side in the longitudinal direction of the vehicle, and a second cooling fan disposed on the rear side of the vehicle of the second intake port. Cooling of a power generation unit for a range extender vehicle according to any one of claims 1 to 3, wherein the air is configured to flow toward the radiation fins of the inverter. structure.