JP2023146326A - Cooling structure of vehicle power generation unit - Google Patents

Abstract

To improve cooling performance of a power generation unit in a compact layout.SOLUTION: A cooling structure of a power generation unit includes: a radiator 37 connected to a power generator 30 and an inverter 35 through a cooling pipe; electric fans 31, 32 located adjacent to the radiator 37; and an introduction pipe 40 which is disposed between the radiator 37 and a power generation engine 20 and enables air outside the unit to circulate to the power generation engine 20. The introduction pipe 40 is provided with an introduction opening part for introducing air. The radiator 37 is disposed so as to overlap with a part of the introduction opening part and air which has passed through the radiator 37 may flow from the introduction opening part into the introduction pipe 40.SELECTED DRAWING: Figure 5

Description

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

BACKGROUND ART As an electric vehicle having a battery for driving an electric motor, a vehicle equipped with a small power generation unit is known, for example, as disclosed in Patent Document 1. By mounting the power generation unit and supplying power to a battery or an electric motor, it is possible to extend the cruising distance.

The power generation unit of the above example is removably mounted, for example, in a space provided at the bottom of the rear portion of the vehicle. The power generation unit in this example includes a power generation engine, a generator, and electrical components such as an inverter, which are housed inside a case.

By configuring the power generation unit to be removable from the vehicle body in this manner, maintainability is improved, and furthermore, the power generation unit can be used independently at a location away from the vehicle. However, since such a power generation unit has a limited installation space, it is required to be more compactly configured and to have a predetermined cooling performance. For example, in Patent Document 1, each device is arranged so that the cooling path for cooling the power generation engine and muffler intersects with the cooling path for cooling the inverter, etc., making the power generation unit more compact and improving cooling performance. It is secured.

Japanese Patent Application Publication No. 2021-41834

In such a power generation unit, compactness and cooling performance largely depend on the layout of the components of the power generation unit. In the above example, in the plurality of unit components constituting the power generation unit, cooling paths are provided according to the amount of heat generated by each component. The cooling path is air-cooled, and a fan draws outside air into the cooling path to cool the target component.

Specifically, in one cooling path, a cooling fan is provided at the end of the crankshaft of the power generation engine, and the cooling fan causes cooling air to flow into the cooling path. Since the cooling fan is provided at the end of the crankshaft, it is necessary to form a cooling path starting from the cooling fan. Further, in the other cooling path, an electric fan is provided to cool electrical components such as an inverter.

In the above example, it is necessary to arrange an air guiding member in order to provide a cooling path. Moreover, since there are restrictions in arranging the fans, the degree of freedom in layout of component parts is reduced. Therefore, if you want to obtain sufficient cooling performance with air cooling while ensuring flexibility in the layout of each component that makes up the power generation unit, there is room for improvement in the configuration of the above example. Ta.

The present invention has been made to solve the above problems, and its purpose is to improve the cooling performance of the power generation unit in a vehicle while ensuring flexibility in the layout of the parts that make up the power generation unit. The purpose of the present invention is to provide a cooling structure for a power generation unit.

A cooling structure for a vehicle power generation unit according to the present invention to achieve the above object includes a power generation engine, a generator connected to the power generation engine, and electrical components electrically connected to the generator. , a unit case that accommodates the power generation engine, the generator, and the electrical components and is removably attached to a vehicle. The cooling structure of the vehicle power generation unit includes: a radiator connected to the generator and the electrical components via a cooling pipe through which a coolant flows; an electric fan disposed adjacent to the radiator; The apparatus further includes an introduction pipe that is disposed between the radiator and the power generation engine and can flow air outside the unit toward the power generation engine, and the cooling air is introduced into the introduction pipe. An introduction opening is provided for the introduction, and the radiator is arranged so as to partially overlap the introduction opening, and the air passing through the radiator is configured to be able to flow into the introduction piping from the introduction opening. has been done.

According to the present invention, it is possible to improve the cooling performance of the power generation unit while ensuring flexibility in the layout of the parts that constitute the power generation unit.

1 is a perspective view showing the appearance of a vehicle power generation unit according to the present invention. FIG. 2 is a plan view schematically showing a power generation engine, a generator, etc. arranged in the unit case of FIG. 1. FIG. FIG. 3 is an enlarged plan view showing the electric fan, radiator, and introduction piping shown in FIG. 2 in an enlarged manner. 3 is a perspective view showing the radiator and introduction piping of FIG. 2. FIG. FIG. 5 is a rear view of the unit seen from the rear side with the radiator of FIG. 4 removed. FIG. 3 is a perspective view showing the power generation engine of FIG. 2 with the cylinder case removed and with the upper part of the introduction pipe omitted.

Hereinafter, one embodiment of a cooling structure for a vehicle power generation unit 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 (unit longitudinal direction). "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 vehicle longitudinal direction (unit longitudinal direction). Further, arrow R and arrow L indicate the right side and the left side when the occupant looks at the front of the vehicle (when looking at the front in the longitudinal direction of the unit).

The power generation unit 1 for a vehicle according to the present embodiment is removably attached to, for example, under the floor of a luggage space provided at the rear of the vehicle. Although explanations using illustrations are omitted, 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. In this case, the power generation unit 1 is disposed, for example, between the left and right rear wheels in the vehicle width direction, and is attached to a highly rigid rear side member, rear cross member, etc. that constitute the vehicle body frame.

As shown in FIG. 2, the power generation unit 1 of this embodiment includes a power generation engine 20, a generator 30, an inverter (electrical component) 35, and a cooling device. It is housed inside a substantially rectangular parallelepiped unit case 10 shown in FIG.

Further, the cooling device for the power generation unit 1 of this embodiment includes a first electric fan 31, a second electric fan 32, a radiator 37, a cooling pipe 38, and an introduction pipe 40. In addition, in the unit cooling device of this embodiment, the above-mentioned parts constituting the device constitute an air cooling system and a water cooling system. Each cooling system of the cooling device will be explained later.

The power generation unit 1 also includes, as other components, a fuel tank (not shown) filled with fuel for driving the power generation engine 20, and a fuel tank (not shown) through which exhaust gas exhausted from the power generation engine 20 flows. and a muffler 28 for exhausting to the outside of the power generation unit 1, these are arranged in the unit case 10 in close proximity. Note that the approximate position of the muffler 28 is shown schematically in FIG.

As shown in FIG. 1, the unit case 10 has a substantially rectangular parallelepiped shape as a whole, and a mounting portion 17 for mounting on a vehicle is provided on the outside of the unit case 10. The power generation unit 1 is attached to the rear of the vehicle, for example, so that the longitudinal direction of the unit case 10 extends along the vehicle width direction. In the following description, the longitudinal direction of the power generation unit 1 corresponds to the vehicle width direction and the left-right direction, and the lateral direction of the power generation unit 1 corresponds to the vehicle longitudinal direction. In addition, in this embodiment, the front part and the rear part of the power generation unit 1 correspond to the front part and the rear part of the power generation unit 1 in the lateral direction (unit front-back direction), and the left-right direction (unit width direction) of the power generation unit 1 corresponds to , correspond to the left and right sides when facing the front of the power generation unit 1.

Further, the unit case 10 of this embodiment includes a tray 11 and a lid 15, as shown in FIG. The tray 11 includes a rectangular bottom part (not shown) on which a power generation engine 20, a generator 30, etc. are installed, and side walls projecting upward from each end of the bottom part and extending along the ends. It has 13. In the following description, the longitudinal direction (long side direction) of the bottom part corresponds to the unit width direction of the power generation unit 1, and the lateral direction (short side direction) corresponds to the unit front-rear direction of the power generation unit 1. .

As shown in FIG. 1, the side wall 13 protrudes upward from the left-right end of the unit case 10 and extends along the front-rear direction of the unit. In this example, as shown in FIG. 1, the attachment portion 14 is provided on the side wall 13. The mounting portion 17 has rollers and the like for running on rails provided on the vehicle body.

The lid 15 has a box shape that covers the tray 11 from above, and is fixed to the side wall 13 of the tray 11. Furthermore, a substantially rectangular air guide hole 16 is provided on the left side of the rear surface of the lid body 15 . Furthermore, a first electric fan 31 and a second electric fan 32 are arranged inside the lid 15 so as to close the air guide hole 16 . Further, a handle 18 is provided on the right side of the air guide hole 16 at the center in the left-right direction on the rear surface. By pulling the handle 18, the power generation unit 1 can be removed from the vehicle body.

The power generation engine 20 is fixed to the bottom surface of the unit case 10 via a bracket (not shown) and a mount (not shown). In this example, the power generation engine 20 is disposed at the front portion of the bottom surface, approximately at the center in the left-right direction. The power generation engine 20 of this embodiment includes a cylinder block 21 in which a piston (not shown) is arranged, a cylinder head 22, a cylinder head cover 23, and a crank case 26 that houses a crankshaft (not shown). ,have.

The cylinder block 21 extends perpendicularly to the longitudinal direction of the crankcase 26. The outer shape of the cylinder block 21 is a substantially rectangular parallelepiped that extends along the front-rear direction of the unit. A cylinder liner (not shown) is provided inside the cylinder block 21. The cylinder liner has a cylindrical shape extending in the front-rear direction of the unit, and the piston is configured to reciprocate inside the cylinder liner. Furthermore, a plurality of radiation fins 21a are provided on the outer surface of the cylinder block 21. The radiation fins 21a protrude outward from the outer surface of the cylinder block 21 and extend in a direction perpendicular to the longitudinal direction of the cylinder block 21.

For example, the plurality of radiation fins 21a provided on the upper surface of the cylinder block 21 protrude upward, extend in the width direction of the unit, and are spaced apart from each other in the front-rear direction of the unit. Similarly, the plurality of radiation fins 21a provided on the side surface of the cylinder block 21 protrude in the width direction of the unit, extend in the up and down direction, and are spaced apart from each other in the front and back direction of the unit.

Further, the cylinder block 21 is arranged inside a cylinder case 25, and the cylinder case 25 covers the cylinder block 21. As shown in FIG. 2, the cylinder case 25 extends in the front-rear direction of the unit, and the front portion of the cylinder case 25 is connected to the rear surface of the crank case 26. Further, the inner wall surface of the cylinder case 25 is spaced apart from the tip of the radiation fin 21a. Cooling air can flow through the interval. An introduction pipe 40, which will be described later, is connected to the side of the cylinder case 25. That is, the radiation fins 21a are cooled by the cooling air supplied from the introduction pipe 40.

As shown in FIG. 2, the crankcase 26 is disposed on the front side of the cylinder block 21 in the front-rear direction of the unit and approximately at the center in the width direction of the unit at the rear of the bottom surface of the tray 11. Further, the crankcase 26 extends in the unit width direction, and a crankshaft extending in the unit width direction is disposed inside the crankcase 26. The crankshaft is connected to the piston by a connecting rod (not shown).

As shown in FIG. 2, the generator 30 is a device that extends in the width direction of the unit, and is fixed to the bottom portion of the crankcase 26 on the left side in the width direction of the unit via a bracket and a mount. Further, the generator 30 is arranged on the left side of the crankcase 26 in the unit width direction, and the front end of the generator 30 is arranged near the front end of the bottom part and near the front wall of the lid body 15. A rotating shaft extending in the unit width direction is arranged inside the generator 30, and the left side of the crankshaft is connected to the rotating shaft. The generator 30 generates power by rotating a rotating shaft driven by the power generation engine 20.

As shown in FIG. 2, the inverter 35 is disposed above the crankcase 26 and on the front side of the cylinder case 25 in the front-rear direction of the unit via a bracket such as a pedestal. In FIG. 2, the approximate position of the inverter 35 is indicated by a broken line. The inverter 35 has a main body and a cooling water tank, and a cooling pipe 38 is connected to the cooling water tank. The main body of the inverter 35 is cooled by the cooling water flowing inside the cooling pipe 38 flowing into the cooling water tank.

Next, the radiator 37 will be explained. The radiator 37 is connected to the generator 30 and the inverter (electrical component) 35 via a cooling pipe 38 through which cooling water (coolant) flows. The radiator 37 of this embodiment is arranged at the rear inside the unit case 10, as shown in FIGS. 2 to 4. Further, the radiator 37 has a substantially rectangular parallelepiped shape extending in the vertical direction, and is arranged so as to face the front-rear direction of the unit. Furthermore, a water supply port 37a that can supply cooling water is provided at the top of the radiator 37.

As shown in FIGS. 2 and 3, the radiator 37 is arranged adjacent to the longitudinal end of the cylinder block 21 that is farther from the crankcase 26. That is, in this example, the radiator 37 is arranged adjacent to the rear end portion of the cylinder block 21.

Moreover, as shown in FIG. 2, the cooling pipe 38 is connected to the lower part of the right side of the radiator 37. The cooling pipe 38 extends to the cooling water tank of the inverter 35. Further, the cooling pipe 38 includes a pipe 38a that connects the cooling water tank and the generator 30, and a pipe 38b that connects the generator 30 and the radiator 37. The water cooling system is configured such that cooling water cooled by a radiator 37 flows through a cooling pipe 38.

Next, the electric fans 31 and 32 will be explained. The power generation unit 1 of this embodiment has a first electric fan 31 and a second electric fan 32, as shown in FIG. 1, and these have a unit width as shown in FIGS. are arranged in a row in the direction. In this example, the second electric fan 32 is arranged on the right side of the first electric fan 31. Further, the first electric fan 31 and the second electric fan 32 are arranged adjacent to the radiator 37. In this example, the second electric fan 32 is arranged adjacent to the rear of the radiator 37 in the rearward direction of the unit. Further, as described above, the first electric fan 31 and the second electric fan 32 are arranged to face the air guide hole 16 on the rear surface of the lid 15 of the unit case 10.

Here, the air cooling system will be explained. The air cooling system of this embodiment includes a first electric fan 31, a second electric fan 32, and a fan cowl. In this example, the air cooling system takes air outside the power generation unit 1 into the unit using the first electric fan 31 and the second electric fan 32, and cools the unit components that make up the unit. It is configured to exhaust to the outside of the unit.

The fan cowl is composed of an introduction pipe 40 and a cylinder case 25. The introduction pipe 40 will be explained below. As shown in FIGS. 2 and 4, the introduction pipe 40 is disposed between the radiator 37 and the power generation engine 20, and is configured to allow air from outside the unit to flow toward the power generation engine 20. Further, the introduction pipe 40 has introduction openings 41 and 42, a reduced diameter portion 43, and a connecting portion 45, as shown in FIGS. 4 to 6. Further, the radiator 37 is arranged so as to partially overlap the introduction openings 41 and 42, and the air passing through the radiator 37 is configured to be able to flow into the introduction pipe 40 from the introduction openings 41 and 42. ing.

The introduction pipe 40 is arranged on the front side of the radiator 37 and on the rear side of the crankcase 26 in the unit front-rear direction. Further, the introduction pipe 40 is arranged on the left side of the cylinder case 25. The introduction openings 41 and 42 are provided at the rear of the introduction pipe 40. A connecting portion 45 of the introduction pipe 40 is connected to the right side of the cylinder case 25 for fluid communication.

Here, the introduction openings 41 and 42 will be explained. As shown in FIGS. 4 and 5, the introduction openings 41 and 42 include a first introduction opening 41 and a second introduction opening 42, which are arranged side by side in the unit width direction. . In this example, the first introduction opening 41 is arranged to the left of the second introduction opening 42 . A portion of the air taken in by the first electric fan 31 and the second electric fan 32 flows into the first introduction opening 41 . Further, the first introduction opening 41 is arranged adjacent to the left side of the radiator 37 and has a substantially rectangular shape extending in the vertical direction. A right side wall 41a forming an opening edge of the first introduction opening 41 extends in the vertical direction and is disposed adjacent to the left side of the radiator 37. Further, the first introduction opening 41 is arranged to face the first electric fan 31 . That is, a portion of the air taken in by the first electric fan 31 flows into the introduction pipe 40 from the first introduction opening 41 . Note that another part of the air taken in by the first electric fan 31 flows toward the oil cooler 50 and the like arranged on the left side of the introduction pipe 40 (FIGS. 2 and 3).

The second introduction opening 42 is arranged to overlap the radiator 37, and air that has passed through the radiator 37 flows into the second introduction opening 42. Further, as shown in FIG. 4, the second introduction opening 42 is disposed in front of the first introduction opening 41 in the front-rear direction of the unit, and has a substantially rectangular shape extending in the vertical direction. Further, since the second introduction opening 42 is arranged to face the radiator 37, the air taken into the unit by the second electric fan 32 passes through the radiator 37 and is heat exchanged with the radiator 37. Later, it flows into the introduction pipe 40 through the second introduction opening 42 .

The introduction pipe 40 is bent to the right on the front side of the introduction openings 41 and 42, as shown in FIGS. 4 and 6, and is connected to the right side of the cylinder case 25. Here, the flow of cooling air in the air cooling system will be explained. Air flowing in from the first introduction opening 41 by the first electric fan 31 flows inside the introduction pipe 40 . Further, the air outside the unit sucked by the second electric fan 32 is blown onto the radiator 37 and exchanges heat with the radiator 37 . The air that has undergone heat exchange in the radiator 37 and has passed through the radiator 37 flows into the second introduction opening 42 and merges with the air that has flowed in from the first introduction opening 41. The combined air passes through the introduction pipe 40 and is blown onto the cylinder block 21. The air blown onto the cylinder block 21 undergoes heat exchange with the outer surface of the cylinder block 21 and the radiation fins 21a, and then flows into the muffler 28 and is exhausted to the outside of the power generation unit 1.

In this embodiment, since the first electric fan 31 is adjacent to the radiator 37, the cooling water flowing through the radiator 37 can be constantly cooled. In this case, the electrical components connected to the radiator 37, such as the inverter 35, are always kept cool, improving cooling efficiency.

Further, the air that has undergone heat exchange with the radiator 37 and has passed through the radiator 37 is used to cool the cylinder block 21. The air heat-exchanged by the radiator 37 has a higher temperature than the air outside the unit, but is lower than the temperature of the cylinder block 21, so it can be used as cooling air to cool the cylinder block 21. That is, according to the present embodiment, the unit components constituting the power generation unit 1 can be effectively cooled using the air taken in by the electric fans 31 and 32 without wasting the air. can. Further, since the electric fans 31 and 32 are arranged near the rear surface of the lid body 15, the degree of freedom in layout of the components constituting the cooling system is improved.

Moreover, in this embodiment, as shown in FIG. 40, and the flow of air becomes turbulent inside the introduction pipe 40. Furthermore, since the air taken in by the second electric fan 32 is deflected by passing through the radiator 37, it can also be made easier to mix with the air outside the unit flowing in from the first electric fan 31.

As the air outside the unit mixes with the air that has passed through the radiator 37, the temperature of the air that has been heat exchanged in the radiator 37 decreases, and the temperature of the air that is blown onto the cylinder block 21 is reduced. This makes it possible to lower the temperature of the air. As a result, the cylinder block 21 can be cooled more efficiently, and the cooling performance of the power generation engine 20 is improved.

Further, as described above, the introduction pipe 40 of this embodiment is configured to extend in the direction from the radiator 37 toward the power generation engine 20 (unit front-rear direction), and air is configured to flow along this direction. The reduced diameter portion 43 of the introduction pipe 40 of this embodiment is set at a position closer to the power generation engine 20 than the introduction openings 41 and 42, and has a flow passage cross-sectional area smaller than the opening area of the introduction openings 41 and 42. ing. When the reduced diameter portion 43 is viewed from the introduction openings 41 and 42, the reduced diameter portion 43 overlaps the first introduction opening 41 and the second introduction opening 42.

The reduced diameter portion 43 is arranged between the introduction openings 41 and 42 and the crankcase 26 in the unit front-rear direction. In this embodiment, the distance between the reduced diameter portion 43 and the crankcase 26 is smaller than the distance between the reduced diameter portion 43 and the first introduction opening 41 .

By providing the reduced diameter portion 43, air can be mixed more effectively. For example, in this embodiment, the air outside the unit that flows in through the first introduction opening 41 and the air that flows in through the second introduction opening 42 and passes through the radiator 37 flow through the introduction openings 41 and 42 into the reduced diameter section. 43. Therefore, the reduced diameter portion 43 induces mixing of the air flowing in from the different introduction openings 41 and 42, and the air can be mixed more effectively. Thereby, the temperature of the air that has passed through the radiator 37 can be effectively lowered, and as a result, the cooling performance of the power generation engine 20 can be improved.

Further, in this embodiment, the inner wall surface forming the flow path of the introduction pipe 40 has an inclined part 48 that slopes toward the center of the flow path cross section as it goes from the introduction openings 41 and 42 to the reduced diameter part 43. It is provided. The inclined portion 48 of this embodiment is provided on an inner wall surface located between the reduced diameter portion 43 and the first introduction opening 41, and is located between the reduced diameter portion 43 and the second introduction opening 42. It is installed on the inner wall surface located between the two.

In this example, in the inner wall surface located between the reduced diameter portion 43 and the first introduction opening 41, the lower inner wall surface is inclined upward toward the front in the front-rear direction of the unit. The left inner wall surface slopes to the right as it goes forward. Similarly, the upper inner wall surface slopes downward toward the front. In the inner wall surface located between the reduced diameter portion 43 and the second introduction opening 42, the lower inner wall surface is inclined upwardly toward the front. The right inner wall surface slopes to the left as it moves forward, and the upper inner wall surface slopes downward as it moves forward. That is, the inclined portion 48 slopes gently toward the reduced diameter portion 43, and the front portion of the inclined portion 48 is smoothly connected to the reduced diameter portion 43.

By providing the sloped portion 48, air can be guided along the sloped portion 48. Therefore, mixing of air is more likely to be induced. In addition, by forming the flow path into a shape in which the cross section gradually becomes smaller, sudden changes in shape such as steps are suppressed on the flow path surface. Therefore, the pressure loss of air can be suppressed, and the decrease in flow rate can be reduced.

For example, air outside the unit sucked in by the first electric fan 31 from the first introduction opening 41 passes through the inclined portion 48 and flows into the reduced diameter portion 43 . Furthermore, the air that has passed through the radiator 37 also passes through the inclined portion 48 and flows into the reduced diameter portion 43 . That is, since the air flows with low resistance until reaching the reduced diameter portion 43, mixing of air is likely to occur in the reduced diameter portion 43. That is, turbulence is likely to occur near the reduced diameter portion 43. Therefore, in this embodiment, the air in the turbulent region can be easily caused to flow into the cylinder case 25 by the air flowing through the inclined portion 48 . As a result, while suppressing a decrease in the flow rate of air flowing through the introduction pipe 40, the temperature of the air inside the introduction pipe 40 can be lowered, making it easier to maintain cooling performance.

Further, the radiator 37 is arranged adjacent to the longitudinal end of the cylinder block 21 from the crankcase 26 . In this example, the radiator 37 is arranged adjacent to the rear end of the cylinder block 21 (on the left side of the cylinder head 22 and cylinder head cover 23).In addition, the introduction pipe 40 is bent as described above and 25. Therefore, when the introduction openings 41 and 42 are viewed from the outside, the connection part 45 is not visible. 47 (inner wall surface located at the front), the air outside the unit and the air passing through the radiator 37 collide with each other, making it possible to mix the air more effectively.

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.

Although this embodiment describes an example in which the power generation unit 1 is attached to the rear of the vehicle, the present invention is not limited to this. For example, it may be detachably attached to the side of the vehicle. In this case, the unit longitudinal direction corresponds to the vehicle width direction. Further, for example, the bottom portion of the tray 11 of the unit case 10 may be arranged in the vertical direction. In this case, in the unit longitudinal direction in the above embodiment, the first and second electric fans 31 and 32 are provided at the bottom with respect to the vehicle vertical direction, and the air guide hole 16 opens downward.

Further, in this embodiment, the cross section of the flow path between the reduced diameter portion 43 and the introduction openings 41 and 42 gradually becomes smaller toward the front because the inclined portion 48 is provided on the inner wall surface. It is not limited to this. For example, a step may be formed at a predetermined position to reduce the cross section of the flow path. Further, although the inclined portion 48 in this embodiment is formed in a planar shape, it may be formed in a curved shape. Further, the inclined portion 48 may have a funnel shape so that the cross section of the flow path becomes smaller toward the reduced diameter portion 43.

1 Power generation unit 10 Unit case 11 Tray 13 Side wall 15 Lid body 16 Air guide hole 17 Mounting part 18 Handle 20 Power generation engine 21 Cylinder block 21a Radiation fins 22 Cylinder head 23 Cylinder head cover 25 Cylinder case 26 Crank case 28 Muffler 30 Generator 31 First electric fan 32 Second electric fan 35 Inverter 37 Radiator 37a Water supply port 38 Cooling pipe 40 Introduction pipe 41 First introduction opening 42 Second introduction opening 43 Reduced diameter section 45 Connection section 47 Back wall 48 Inclined part 50 Oil cooler

Claims (5)

It houses a power generation engine, a generator connected to the power generation engine, electrical components electrically connected to the generator, the power generation engine, the generator, and the electrical components, and is detachable from the vehicle. In a cooling structure for a vehicle power generation unit, the cooling structure includes a unit case that can be attached to the vehicle.
a radiator connected to the generator and the electrical component via a cooling pipe through which a cooling liquid flows;
an electric fan disposed adjacent to the radiator;
further comprising an introduction pipe that is disposed between the radiator and the power generation engine and is capable of circulating air outside the unit toward the power generation engine,
The introduction pipe is provided with an introduction opening for introducing the cooling air,
The vehicle is characterized in that the radiator is arranged so as to partially overlap the introduction opening, and the air passing through the radiator is configured to be able to flow into the introduction pipe from the introduction opening. cooling structure for power generation units. The introduction opening includes a first introduction opening into which air sucked by the electric fan flows, and a second introduction opening which is arranged to overlap with the radiator and into which air that has passed through the radiator flows. The cooling structure for a vehicle power generation unit according to claim 1, characterized in that the cooling structure includes: The introduction piping is configured to extend in a direction from the radiator toward the power generation engine, and air flows along the direction;
The introduction piping has a reduced diameter portion, which is located closer to the power generation engine than the introduction opening, and has a flow passage cross-sectional area smaller than the opening area of the introduction opening;
According to claim 2, when the reduced diameter portion is viewed from the introduction opening, the reduced diameter portion overlaps the first introduction opening and the second introduction opening. Cooling structure of the vehicle power generation unit described. According to claim 3, the flow path surface of the introduction pipe is provided with an inclined portion that slopes toward the center of the flow path cross section as it goes from the introduction opening toward the reduced diameter portion. cooling structure for vehicle power generation units. The power generation engine includes a crankcase that accommodates a crankshaft, and a cylinder block that extends from the crankcase perpendicularly to the longitudinal direction of the crankcase,
The electric fan is arranged to face at least a portion of the introduction opening,
The introduction pipe extends from the introduction opening toward the crankcase and bends toward a side of the cylinder block,
5. The cooling structure for a vehicle power generation unit according to claim 4, wherein the radiator is disposed adjacent to a longitudinal end of the cylinder that is farther from the crankcase.

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