JP6995439B2 - Hybrid car cooling system - Google Patents

Description

The present invention relates to a cooling device for a hybrid vehicle equipped with an engine and a motor as a driving source for traveling.

Conventionally, a hybrid vehicle (HV: Hybrid Vehicle) equipped with an engine and a motor generator as a driving source for traveling is known.

For example, in a split-type (series / parallel-type) hybrid vehicle, the engine and motor generator are connected to the planetary gear mechanism, and the power from the engine can be divided and distributed to the motor generator and drive wheels, from the engine. Power and power from the motor generator can be combined and transmitted to the drive wheels. Further, it is possible to stop the engine and run the EV only by the power from the motor generator.

In some such hybrid vehicles, a motor generator is housed in a case together with a planetary gear mechanism and a differential gear, which constitute a transaxle that transmits power to the drive wheels. The transaxle is arranged side by side with the engine, for example, in the engine room (engine compartment) provided at the front of the vehicle.

In addition, an engine cooling system for cooling the engine is arranged in the engine room. The engine cooling system circulates cooling water between the engine and the radiator by operating the water pump. When the cooling water flows through the engine, heat is exchanged between the cooling water and the engine, the engine is cooled, and the cooling water is heated. Then, the cooling water flowing through the engine flows through the radiator, so that heat exchange is performed between the cooling water and the radiator, and the cooling water is cooled.

Japanese Unexamined Patent Publication No. 10-238345

In a hybrid vehicle having such a configuration, it is conceivable to provide a hybrid cooling system for cooling a transaxle or the like in addition to the engine cooling system. By providing a hybrid cooling system, the transaxle and the like can be separated from the engine for cooling.

However, in light vehicles and small vehicles, the size of the engine room is limited, so that a considerable amount of ingenuity is required to install the hybrid cooling system in the engine room.

An object of the present invention is to provide a cooling device for a hybrid vehicle, which can provide a second cooling system independent of the first cooling system for cooling an engine, even for a light vehicle or a small vehicle.

In order to achieve the above object, the cooling device for a hybrid vehicle according to the present invention is a cooling device for a hybrid vehicle equipped with an engine and a motor as a driving source for traveling, and includes a first cooling system for cooling the engine. The first cooling system includes a first radiator, and the second cooling system distributes the refrigerant to the second radiator and the second radiator, including a second cooling system for cooling the power transmission mechanism that transmits the power of the motor. It comprises a pump and a frame, the frame is fixed to a second radiator, and the pump is supported by the frame.

According to this configuration, a first cooling system for cooling the engine and a second cooling system for cooling the power transmission mechanism for transmitting the power of the motor are provided. Therefore, the engine and the power transmission mechanism can be cooled individually.

A frame is fixed to the second radiator included in the second cooling system, and a pump for circulating the refrigerant to the second radiator is supported on the frame. As a result, the length of the pipe connecting the second radiator and the pump can be shortened as compared with the configuration in which the second radiator and the pump are arranged apart from each other. Further, a bracket or the like that individually supports the second radiator and the pump can be omitted, and the configuration of the second cooling system can be simplified. As a result, the size of the second cooling system can be reduced, and even for vehicles with restrictions on the size of the engine room, such as light cars and small cars, the dimensions of the engine room in the front-rear direction are not expanded. , A second cooling system independent of the first cooling system can be provided.

In addition, since the second radiator and the pump can be assembled to the vehicle in the assembled state (sub-ASSY), the work man-hours on the vehicle assembly line can be reduced, and the work on the assembly line can be performed. It is possible to suppress the occurrence of delay.

According to the present invention, even in a light vehicle or a small vehicle, a second cooling system independent of the first cooling system for cooling the engine can be provided.

It is a top view which graphically shows the structure of the cooling device of the vehicle which concerns on one Embodiment of this invention. It is a perspective view seen from the left rear of a cooling device. It is a perspective view seen from the left front of a cooling device. It is a perspective view seen from the left rear of the HV cooling system shown in FIG. It is a perspective view seen from the left front of the HV cooling system. It is a perspective view seen from the left rear of the HV cooling system which concerns on another embodiment. It is a perspective view seen from the left front of the HV cooling system shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Cooling device for hybrid vehicles>
1, FIG. 2 and FIG. 3 are diagrams illustrating the configuration of the cooling device 17 of the vehicle 1 according to the embodiment of the present invention.

The vehicle 1 is, for example, a split type (series / parallel type) hybrid vehicle, and is equipped with an engine (E / G) 11 and a motor generator (MG) 12 as a driving source for traveling.

The engine 11 is, for example, a gasoline engine or a diesel engine.

The motor generator 12 is composed of a DC brushless motor, and has a function as a motor and a function as a generator (generator). The motor generator 12 constitutes, for example, a transaxle (T / A) 13 housed in a case together with a planetary gear mechanism and a differential gear to transmit power to drive wheels. The transaxle 13 is provided with an oil cooler for cooling (or heating) the oil used in the transaxle 13. Further, the vehicle 1 is provided with a PCU (Power Control Unit) 14 including an inverter for driving the motor generator 12 and a microcomputer (microcontroller unit).

In the vehicle 1, for example, the engine 11 and the motor generator 12 are connected to the planetary gear mechanism, and the power from the engine 11 can be divided and distributed to the motor generator 12 and the drive wheels. Further, the power from the engine 11 and the power from the motor generator 12 can be combined and transmitted to the drive wheels. Further, the engine 11 can be stopped and EV traveling can be performed only by the power from the motor generator 12.

Here, the configuration of the hybrid system of the split method (series / parallel method) has been described as an example, but the method of the hybrid system is not limited to the split method, and may be, for example, a series method or a parallel method. May be. In the series system, the power of the engine is converted into electric power by the generator, the electric power generated by the generator is used to drive the drive motor, and the power of the drive motor is transmitted to the drive wheels. In the parallel system, a power split mechanism consisting of a planetary gear mechanism is provided, and the power of the engine and the power of the motor (motor generator) are transmitted to the drive wheels.

Further, in the vehicle 1, an engine cooling system 15 for cooling the engine 11 and an HV cooling system 16 for cooling the transaxle 13 and the PCU 14 are separately provided, and the vehicle is provided with the engine cooling system 15 and the HV cooling system 16. The cooling device 17 of 1 is configured.

<Engine cooling system>
The engine cooling system 15 includes a first radiator 21 and a first radiator fan 22.

The first radiator 21 has a square plate-like outer shape, and extends vertically and horizontally (vertically and horizontally) at a position on the left side of the front end of the engine room (engine compartment) at the front of the vehicle 1. Have been placed.

The first radiator fan 22 is an electric fan, and is arranged so that the rotating shaft 24 of the fan motor 23 extends in the front-rear direction and faces the first radiator 21 from the rear side.

In the engine cooling system 15, the cooling water (liquid containing water) is circulated between the engine 11 and the first radiator 21 by the operation of the first water pump (not shown). Specifically, when the water pump is driven, the cooling water flows into the water jacket of the engine 11, and the cooling water flowing through the water jacket flows out from the engine 11. As the cooling water flows through the water jacket, heat exchange is performed between the cooling water and the engine 11, the engine 11 is cooled or heated, and the cooling water is heated or lowered.

The cooling water flowing out of the engine 11 flows into the first radiator 21 and circulates in the first radiator 21. When the first radiator fan 22 is driven, the cooling water flowing in the first radiator 21 is cooled by the air blown from the first radiator fan 22. When the vehicle 1 is traveling, the cooling water circulating in the first radiator 21 is cooled by the traveling wind even if the first radiator fan 22 is not operating. The cooling water cooled by the first radiator 21 flows out from the first radiator 21 and flows toward the engine 11.

<HV cooling system>
The HV cooling system 16 includes a second radiator 31, a second radiator fan 32, a second water pump 33, and a closed reserve tank 34.

The second radiator 31 has a square plate-like outer shape, is a front end portion of the engine room at the front of the vehicle 1, is arranged side by side on the right side of the first radiator 21, and is in the vertical and horizontal directions (vertical and horizontal). It is arranged so as to extend to. The width of the second radiator 31 is narrower than that of the first radiator 21, and the second radiator 31 is formed in a vertically long shape in which the dimension in the left-right direction is smaller than the dimension in the up-down direction.

The second radiator fan 32 is an electric fan, and is arranged so that the rotating shaft 36 of the fan motor 35 extends in the front-rear direction and faces the second radiator 31 from the rear side.

The second water pump 33 is arranged behind the second radiator 31.

The reserve tank 34 is arranged above the second radiator 31.

In the HV cooling system 16, the cooling water is circulated between the transaxle 13 and the PCU 14 and the second radiator 31 by the operation of the second water pump 33. Specifically, when the second water pump 33 is driven, cooling water is sucked out from the reserve tank 34, and the cooling water flows through the rubber hose 37. The cooling water is sucked into the second water pump 33 from the rubber hose 37, flows into the second radiator 31 from the second water pump 33 through the rubber hose 38, and circulates in the second radiator 31. When the second radiator fan 32 is driven, the cooling water flowing in the second radiator 31 is cooled by the air blown from the second radiator fan 32. When the vehicle 1 is traveling, the cooling water circulating in the second radiator 31 is cooled by the traveling wind even if the second radiator fan 32 is not operating.

The cooling water cooled by the second radiator 31 flows out from the second radiator 31 and flows toward the oil cooler of the transaxle 13 and the PCU 14. Then, when the cooling water passes through the oil cooler of the transaxle 13 and the PCU 14, heat exchange is performed between the oil cooler and the PCU 14. By this heat exchange, the oil cooler and the PCU 14 are cooled, and the temperature of the cooling water rises. The cooling water via the oil cooler and the PCU 14 flows into the reserve tank 34.

The temperature of the cooling water circulating in the HV cooling system 16 is lower than the temperature of the cooling water circulating in the engine cooling system 15. That is, since the PCU 14 is more sensitive to heat than the engine 11 and the trans axle 13, the engine cooling system 15 has a predetermined first temperature (for example, about 105 ° C.) so that the temperature of the cooling water after passing through the engine 11 becomes a predetermined first temperature (for example, about 105 ° C.). The HV cooling system 16 is designed so that the temperature of the cooling water after passing through the PCU 14 becomes a second temperature (for example, 65 ° C.) lower than the first temperature.

In some conventional gasoline engine vehicles, an electric compressor 41 of an air conditioner is arranged on the right side of the radiator. In the vehicle 1, the electric compressor 41 is arranged behind the engine 11 while basically following the layout, and the second radiator 31 is arranged in the space created by the electric compressor 41.

<Assembly structure of HV cooling system>
FIG. 4 is a perspective view of the HV cooling system 16 as viewed from the left rear. FIG. 5 is a perspective view of the HV cooling system 16 as viewed from the left front.

The HV cooling system 16 is integrated (sub-ASSY) as an assembly by using the frame 51. The frame 51 connects a flat cylindrical (annular frame-shaped) fan arranging portion 52, an annular fan fixing portion 53 having a smaller diameter than the fan arranging portion 52, and the fan arranging portion 52 and the fan fixing portion 53. A plurality of connecting portions 54, a first extending portion 55 and a second extending portion 56 extending upward from the fan arranging portion 52, a third extending portion 57 extending downward from the fan arranging portion 52, and the like. It has a fourth extension portion 58 integrally.

A second radiator fan 32 is arranged inside the fan arrangement portion 52. The second radiator fan 32 is supported by the frame 51 by fixing the fan motor 35 to the fan fixing portion 53.

The frame 51 is arranged behind the second radiator 31. The first extending portion 55 and the second extending portion 56 of the frame 51 extend upward from positions spaced apart from each other in the circumferential direction in the upper portion of the outer peripheral surface of the fan arranging portion 52. The tip of the first extending portion 55 is fixed to the fourth mounting portion 74 (described later) of the reserve tank 34 by a bolt 61. The tip of the second extending portion 56 is fixed to the fifth mounting portion 75 (described later) of the reserve tank 34 by a bolt 62. Further, the third extension portion 57 and the fourth extension portion 58 extend downward from positions spaced apart from each other in the circumferential direction in the lower portion of the outer peripheral surface of the fan arrangement portion 52. The third extension portion 57 is fixed to the rear surface of the second radiator 31 by bolts 63. The fourth extending portion 58 is fixed to the rear surface of the second radiator 31 by bolts 64.

The second water pump 33 is arranged at a position on the rear side of the frame 51 and on the lower right side of the fan arrangement portion 52. The first mounting portion 65 and the second mounting portion 66 are integrally formed on the second water pump 33. The second water pump 33 is supported by the frame 51 by fixing the first mounting portion 65 and the second mounting portion 66 to the frame 51 by bolts 67 and 68, respectively.

The reserve tank 34 is arranged above the frame 51. The reserve tank 34 is integrally formed with a first mounting portion 71, a second mounting portion 72, a third mounting portion 73, a fourth mounting portion 74, and a fifth mounting portion 75. The first mounting portion 71 extends downward from the front lower end portion of the reserve tank 34. The second mounting portion 72 and the third mounting portion 73 extend to the left and right sides from the reserve tank 34, respectively. The fourth mounting portion 74 and the fifth mounting portion 75 extend downward from positions spaced apart from each other in the left-right direction on the bottom surface of the reserve tank 34.

The first mounting portion 71 is arranged on the front surface side of the second radiator 31, and is fixed to the front surface of the second radiator 31 by bolts 81. The second mounting portion 72 and the third mounting portion 73 are arranged on the rear surface side of the second radiator 31, and are fixed to the rear surface of the second radiator 31 by bolts 82 and 83, respectively. The fourth mounting portion 74 and the fifth mounting portion 75 are arranged on the rear surface side of the second radiator 31. The fourth mounting portion 74 serves as a mounting seat surface for the first extending portion 55 of the frame 51, and as described above, the first extending portion 55 is fixed by the bolt 61. The fifth mounting portion 75 serves as a mounting seat surface for the second extending portion 56 of the frame 51, and as described above, the second extending portion 56 is fixed by the bolt 62.

<Action effect>
As described above, the engine cooling system 15 for cooling the engine 11 and the HV cooling system 16 for cooling the transaxle 13 and the PCU 14 for transmitting the power of the motor generator 12 are provided. Therefore, the engine 11 and the transaxle 13 and the PCU 14 can be cooled separately.

The first radiator 21 included in the engine cooling system 15 and the second radiator 31 included in the HV cooling system 16 are arranged side by side in the engine room in the vehicle width direction (left-right direction). Therefore, even if the size of the engine room is restricted, such as a light car or a small car, the HV cooling system 16 independent of the engine cooling system 15 can be provided without expanding the size of the engine room in the front-rear direction. can.

Moreover, unlike the configuration in which the first radiator 21 and the second radiator 31 are arranged so as to overlap each other in the front-rear direction, both the first radiator 21 and the second radiator 31 can be cooled by the outside air, and the cooling efficiency can be improved. can.

Further, the engine cooling system mounted on the conventional gasoline engine vehicle can be diverted to the engine cooling system 15. Therefore, the man-hours for developing the vehicle 1 can be significantly reduced.

The second radiator 31, the second radiator fan 32, the second water pump 33, and the reserve tank 34 included in the HV cooling system 16 are integrated. As a result, the lengths of the rubber hose 37 connecting the second water pump 33 and the reserve tank 34 and the rubber hose 38 connecting the second radiator 31 and the second water pump 33 can be shortened. Further, the bracket that individually supports the second radiator 31, the second radiator fan 32, the second water pump 33, the reserve tank 34, and the like can be omitted, and the configuration of the HV cooling system 16 can be simplified. As a result, the size of the HV cooling system 16 can be reduced, and even for vehicles such as light vehicles and small vehicles, which have restrictions on the size of the engine room, the dimensions of the engine room in the front-rear direction are not expanded. , The HV cooling system 16 independent of the engine cooling system 15 can be provided.

Further, since the second radiator 31, the second radiator fan 32, the second water pump 33, and the reserve tank 34 can be assembled to the vehicle 1 in an assembled state, the work man-hours on the assembly line of the vehicle 1 can be reduced. It can be reduced and delays in work on the assembly line can be suppressed.

Moreover, in the configuration of the HV cooling system 16, mount grommets 91, 92, 93, 94 are provided at two locations above and below the assembly. Then, by inserting these mount grommets 91 to 94 into radiator supports (not shown) provided in the vehicle 1, the assembly of the HV cooling system 16 can be assembled in the vehicle 1.

<Other embodiments>
FIG. 6 is a perspective view seen from the left rear of the HV cooling system 16 according to another embodiment. FIG. 7 is a perspective view of the HV cooling system 16 shown in FIG. 6 as viewed from the left front. In FIGS. 6 and 7, the parts corresponding to the parts shown in FIGS. 4 and 5 are designated by the same reference numerals as those of the parts. Further, in the following, the description of the portion with the same reference numeral will be omitted.

The second water pump 33 is arranged at a position on the rear side of the frame 51 and on the lower right side of the fan arranging portion 52, and is fixed to the frame 51 by the mounting member 101.

The reserve tank 34 is arranged above the frame 51. The reserve tank 34 is integrally formed with a first mounting portion 111, a second mounting portion 112, a third mounting portion 113, and a fourth mounting portion 114. The first mounting portion 111 and the second mounting portion 112 extend from the reserve tank 34 to the left and right sides, respectively. The third mounting portion 113 extends from the right side surface of the reserve tank 34 to the right side. The fourth mounting portion 114 extends downward from the bottom surface of the reserve tank 34.

The first mounting portion 111 and the second mounting portion 112 are arranged on the upper surface side of the second radiator 31, and are fixed to the upper surface of the second radiator 31 by bolts 115 and 116, respectively. The third mounting portion 113 and the fourth mounting portion 114 are arranged on the rear side of the frame 51 and are fixed to the frame 51 by bolts 117 and 118, respectively.

With this configuration as well, it is possible to obtain the same effects as the configuration of the above-described embodiment, that is, the configurations shown in FIGS. 4 and 5.

<Modification example>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other embodiments.

For example, in the description of the configuration shown in FIG. 4, the fourth mounting portion 74 and the fifth mounting portion 75 of the reserve tank 34 are the mounting seat surfaces of the first extending portion 55 and the second extending portion 56 of the frame 51, respectively. Therefore, the first extension portion 55 and the second extension portion 56 are fixed to the fourth attachment portion 74 and the fifth attachment portion 75, respectively. However, not limited to this, an insertion hole through which the bolt 61 can be inserted is formed in the fourth mounting portion 74 of the reserve tank 34, and a fourth is formed between the first extension portion 55 and the second radiator 31 of the frame 51. With the mounting portion 74 sandwiched, the first extending portion 55 and the fourth mounting portion 74 may be co-tightened to the second radiator 31 by the bolt 61. Similarly, an insertion hole through which the bolt 62 can be inserted is formed in the fifth mounting portion 75 of the reserve tank 34, and the fifth mounting portion 75 is formed between the second extending portion 56 and the second radiator 31 of the frame 51. In the sandwiched state, the second extending portion 56 and the fifth mounting portion 75 may be co-tightened to the second radiator 31 by the bolt 62.

Further, the number of motor generators mounted on the transaxle 13 may be one or two or more. Further, the drive source included in the transaxle 13 is not limited to the motor generator, and may be a simple motor.

In addition, various design changes can be made to the above-mentioned configuration within the scope of the matters described in the claims.

1: Vehicle (hybrid vehicle)
11: Engine 12: Motor generator (motor)
13: Transaxle (power transmission mechanism)
15: Engine cooling system (first cooling system)
16: HV cooling system (second cooling system)
17: Cooling device 21: 1st radiator 31: 2nd radiator 33: 2nd water pump (pump)
51: Frame

Claims (2)

A cooling device for hybrid vehicles equipped with an engine and motor as a driving source for driving.
The first cooling system that cools the engine and
Includes a second cooling system that cools the power transmission mechanism that transmits the power of the motor.
The first cooling system includes a first radiator.
The second cooling system includes a second radiator , a second radiator fan that blows air to the second radiator, a pump that distributes a refrigerant to the second radiator, and a frame.
The frame is fixed to the second radiator, and the frame is fixed to the second radiator.
The second radiator is formed in a vertically long shape in which the dimension in the left-right direction is smaller than the dimension in the up-down direction.
The second radiator fan is supported by the frame and is arranged so as to face the second radiator from the rear side in a direction in which the rotation axis of the fan motor extends back and forth.
A cooling device supported by the frame and arranged in a region facing the second radiator from the rear side at a position shifted in the left-right direction with respect to the second radiator fan . The cooling device according to claim 1, wherein the pump is arranged at a position lower than the second radiator fan.

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