JP2020114087A - In-vehicle cooling device - Google Patents

Abstract

To provide an in-vehicle cooling device capable of obtaining sufficient cooling performance while integrating a case accommodating an electrical system.SOLUTION: An in-vehicle cooling device (1) of the present invention comprises: a case (4a, 6a, 8a); a rotary electric machine (4) housed in a first space (30c) inside the case; a power conversion device (8b, 8c) housed in a second space (28c) inside the case; a first cooling mechanism (18) for cooling the rotary electric machine in the first space using a first cooling liquid; a second cooling mechanism (16) for cooling the power conversion device in the second space using a second cooling liquid; conductors (24, 26) extending inside the case so as to connect the rotary electric machine and the power conversion device; and a seal member (34) for sealing between the first space and the second space. The seal member suppresses mixing of the first cooling liquid in the first space and the second cooling liquid in the second space.SELECTED DRAWING: Figure 6

Description

The present invention relates to a vehicle-mounted cooling device, and more particularly to a cooling device for cooling an electric system of a vehicle.

Generally, each electric device mounted on a vehicle is housed in a separate and independent case, and they are connected by a harness. For example, a drive motor, a generator for power generation, an inverter for supplying electric power to the drive motor, a DC-DC converter for converting a DC voltage, etc. are housed in respective independent cases, and terminals provided in each case are harnessed. An electrical system is constructed by connecting them. In this way, when each electric device is housed in an independent case and they are connected by a harness, in a high-voltage electric device, the harness has a high withstand voltage, and electric shock measures that satisfy legal regulations are taken. There is a need to. For this reason, there arises a problem that the electric system for driving the vehicle becomes large and the weight becomes large.

On the other hand, Japanese Unexamined Patent Application Publication No. 2014-117157 (Patent Document 1) describes a motor drive device. In this motor drive device, the case portion that houses the winding for driving the motor, the case portion that houses the inverter portion, and the case portion that houses the winding switching portion are integrated. As a result, the dead space generated between the cases can be reduced, and the motor drive device can be made smaller. Further, in this motor drive device, a cooling pipe that circulates cooling water is provided in the case portion that houses the winding for driving the motor, so that the motor can be cooled. Further, the case portion accommodating the winding switching portion is provided with a fin for heat dissipation on the outside, and the winding switching portion is brought into surface contact with a wall surface inside the portion where the fin is provided, thereby The heat generated in the switching portion is dissipated to the outside of the case portion.

JP, 2014-117157, A

However, in the motor drive device described in Patent Document 1, since the motor is cooled by the cooling pipe in which the cooling water circulates, there is a problem that sufficient cooling performance cannot be obtained. That is, in the cooling by the cooling pipe, the air in the case is once cooled by the cooling pipe, and the motor driving winding in the case is cooled by the cooled air, so that the cooling efficiency is low and the cooling performance is sufficient. Can't get Further, in the motor drive device described in Patent Document 1, since the winding switching portion is naturally air-cooled by the heat radiation fins formed in the case portion, a huge heat radiation fin is required to obtain sufficient cooling performance. There is a problem that it becomes necessary.

Therefore, an object of the present invention is to provide a vehicle-mounted cooling device that can obtain sufficient cooling performance while integrating a case that houses an electric system.

In order to solve the above-mentioned problems, the present invention is a cooling device for cooling an electric system of a vehicle, including a case, a rotating electric machine housed in a first space inside the case, A first power cooling device, which is housed in a second space different from the first space, inside the case, and a rotating electric machine in the first space are cooled using a first cooling liquid. And a second cooling mechanism that cools the power conversion device in the second space by using a second cooling liquid different from the first cooling liquid, the rotating electric machine, and the power conversion device. A conductor that extends inside the case so as to be electrically connected, and a seal member that seals between the first space and the second space, and the seal member is the first space in the first space. It is characterized in that the first cooling liquid and the second cooling liquid in the second space are prevented from being mixed with each other.

According to the present invention configured as described above, since the rotating electric machine and the power converter are cooled by the first and second cooling liquids respectively, cooling can be performed more strongly than when air-cooled. it can. Further, since the conductor that electrically connects the rotary electric machine and the power converter extends inside the case, it is not necessary to provide a harness outside the case to connect the rotary electric machine and the power converter. As a result, it is possible to avoid an increase in weight and an increase in cost due to the harness having a high insulating property to be arranged outside the case. Further, according to the present invention, the seal member suppresses mixing of the first cooling liquid and the second cooling liquid. Therefore, it is possible to prevent the first and second cooling liquids from being mixed with each other and causing a failure when the cooling liquid leaks while housing the rotating electric machine and the power conversion device in an integrated case. can do.

In the present invention, preferably, the second space accommodating the power conversion device is provided above the inside of the first space accommodating the rotating electric machine.
According to the present invention having such a configuration, since the second space accommodating the power conversion device is provided above the first space accommodating the rotating electric machine, generally, the rotation with a large weight is performed. The electric machine can be arranged on the lower side, and the vehicle-mounted cooling device can be arranged stably.

In the present invention, preferably, the first cooling mechanism that cools the rotating electric machine is an oil cooling type, and the second cooling mechanism that cools the power conversion device is a water cooling type.
According to the present invention having such a configuration, since the rotary electric machine is an oil-cooled type, it is possible to directly cool the coil or the like of the rotary electric machine, which generates a large amount of heat, with oil, and the rotary electric machine can be effectively used. Can be cooled.

In the present invention, preferably, the first cooling liquid used for cooling the rotating electric machine is a fluorinated liquid.
According to the present invention thus configured, since the fluorine-based liquid is used for cooling the rotating electric machine, the rotating electric machine can be cooled more effectively.

In the present invention, preferably, the rotary electric machine includes a motor, and further has a reduction mechanism that reduces the rotational output of the motor, and the reduction mechanism is cooled by the first cooling liquid together with the motor.

According to the present invention configured as described above, since the reduction mechanism is cooled by the first cooling liquid together with the motor that is the rotating electric machine, the cooling mechanism of the reduction mechanism can be used also as the motor. The cooling device for a vehicle can be downsized.

In the present invention, preferably, the rotary electric machine includes a generator, and further has an internal combustion engine for powering the generator.
According to the present invention configured as described above, since power is applied to the generator, which is a rotary electric machine, by the internal combustion engine, it is possible to generate electric power and charge the battery without using an external power source. ..

In the present invention, preferably, the rotary electric machine includes a motor and a generator, and further includes a reduction mechanism that reduces the rotational output of the motor and an internal combustion engine that applies power to the generator. The engine and the generator are arranged in this order in the width direction of the vehicle.

According to the present invention having such a configuration, since the motor, the speed reduction mechanism, the internal combustion engine, and the generator are sequentially arranged in the width direction of the vehicle, the vehicle-mounted cooling device integrated with the vehicle drive device is provided. , Can be configured compactly.

In the present invention, preferably, the power conversion device includes at least one of an inverter that converts direct current into alternating current and a DC-DC converter that converts direct current voltage.

According to the present invention configured as described above, the power conversion device includes at least one of an inverter and a DC-DC converter, so that the present invention can be applied to various vehicle-mounted cooling devices.

According to the vehicle-mounted cooling device of the present invention, it is possible to obtain sufficient cooling performance while integrating the case that houses the electric system.

It is a perspective view showing a state where a vehicle-mounted cooling device according to an embodiment of the present invention is mounted on a vehicle. FIG. 3 is a plan view showing a state in which the vehicle-mounted cooling device according to the embodiment of the present invention is mounted on a vehicle. It is a perspective view showing a vehicle-mounted cooling device by an embodiment of the present invention. It is a block diagram showing the whole vehicle-mounted cooling device by an embodiment of the present invention. FIG. 3 is a cross-sectional view showing an internal structure of a motor, a generator, and a power converter device case in the vehicle-mounted cooling device according to the embodiment of the present invention. In the vehicle-mounted cooling device according to the embodiment of the present invention, it is an enlarged cross-sectional view showing an enlarged connecting portion between the motor and the power converter device case.

Next, a vehicle-mounted cooling device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a state in which a vehicle-mounted cooling device according to an embodiment of the present invention is mounted on a vehicle. FIG. 2 is a plan view showing a state in which the vehicle-mounted cooling device according to the embodiment of the present invention is mounted on a vehicle. FIG. 3 is a perspective view showing the vehicle-mounted cooling device according to the embodiment of the present invention. FIG. 4 is a block diagram showing the entire vehicle-mounted cooling device according to the embodiment of the present invention.

First, the arrangement structure of each component in the vehicle-mounted cooling device 1 according to the present embodiment will be described with reference to FIGS. 1 to 3.
The vehicle-mounted cooling device 1 according to the present embodiment is integrated with a vehicle drive device, and is a deceleration mechanism that is a deceleration mechanism that decelerates the rotational output of the internal combustion engine 2, the motor 4, the generator 6, the power conversion device case 8a, and the motor 4. The gear 10 is integrated. As will be described later, in the present embodiment, the power converter case 8a has an inverter 8b and a rectifier 8c (FIG. 6) built therein as a power converter. Further, as shown in FIGS. 1 and 2, the vehicle-mounted cooling device 1 is mounted on the front portion of the vehicle body B, and the motor 4, the reduction gear 10, the internal combustion engine 2, and the generator 6 are arranged in the vehicle width direction of the vehicle. They are arranged in this order. Further, in the present embodiment, as will be described later, the drive shaft 12 (FIG. 2) of the vehicle is driven by the driving force of the motor 4 and is not directly driven by the power generated by the internal combustion engine 2.

Further, the vehicle-mounted cooling device 1 according to the present embodiment is provided with the internal combustion engine radiator 14 for cooling the internal combustion engine 2, the oil cooler 18 that is the first cooling mechanism, and the power converter device that is the second cooling mechanism. The radiator 16 is provided. The radiator 16 for exclusive use of the power converter is configured to cool the power converter, and the oil cooler 18 is configured to cool the motor 4 and the generator 6.

The internal combustion engine 2 is configured to generate power by burning fuel loaded on the vehicle, and the power generated by the internal combustion engine 2 drives an input shaft (not shown) of the generator 6 to generate electric power. Is generated. The electric power generated by the generator 6 is stored as electric energy in the lithium ion battery 20 (FIG. 2) which is a storage battery. In this embodiment, a rotary engine is used as the internal combustion engine 2.

The motor 4 is a rotating electric machine that is driven by the electric energy stored in the lithium-ion battery 20, and is configured to drive the drive shaft 12 of the vehicle. The output shaft of the motor 4 is connected to the input shaft of the reduction gear 10 that is a reduction mechanism, and the rotation output of the motor 4 drives the drive shaft 12 via the reduction gear 10. Further, the motor 4 is configured to regenerate kinetic energy of the vehicle into electric energy and generate AC power when the vehicle is decelerated. In this embodiment, an AC driven permanent magnet motor is used as the motor 4.

The generator 6 is a rotary electric machine configured to generate AC power by the power generated by the internal combustion engine 2, and its input shaft is rotationally driven by the output shaft of the internal combustion engine 2. The AC power generated by the generator 6 is converted into DC by the rectifier 8c in the power converter case 8a and stored in the lithium ion battery 20.

The power conversion device case 8a is, as a power conversion device, an inverter 8b (FIG. 5) that converts DC power supplied from the lithium-ion battery 20 into AC power, AC power generated by the generator 6, and regeneration by the motor 4. A rectifier 8c (FIG. 5) for converting the generated AC power into DC power is built in an integrated case. The electric power converted into alternating current by the inverter 8b is supplied to the motor 4, and the motor 4 is driven. Further, the lithium-ion battery 20 is charged with the electric power converted into the direct current by the rectifier 8c. The power converter case 8a may include a DC-DC converter (not shown) that steps up and/or steps down a DC voltage, or a junction box (not shown).

Further, the power conversion device case 8a is arranged above the motor 4, the reduction gear 10, the internal combustion engine 2, and the generator 6, and the power conversion device case 8a, the case of the motor 4 and the case of the generator 6 are integrated. Make up the case. Here, in general, the motor, the generator, and the power conversion device are housed in independent cases, and the cases are electrically connected by a wire harness. On the other hand, in the vehicle-mounted cooling device 1 of this embodiment, the motor 4, the generator 6, and the power conversion device case 8a are integrated, and a wire harness for connecting them is not provided. Therefore, the power conversion device case 8a and the motor 4, and the power conversion device case 8a and the generator 6 are connected by a conductor extending inside the integrated case.

As shown in FIG. 2 and FIG. 3, the internal combustion engine dedicated radiator 14 is a plate-shaped heat exchanger that is arranged on the front side of the vehicle with respect to the internal combustion engine 2. It is configured to radiate the heat of the cooling liquid to the atmosphere by hitting the plate surface of. Further, the internal combustion engine 2 and the internal combustion engine dedicated radiator 14 are connected by a pipe (not shown) for the cooling liquid, and the cooling liquid is circulated between the internal combustion engine dedicated radiator 14 and the internal combustion engine 2. ing. That is, the cooling liquid that has cooled the internal combustion engine 2 and has increased in temperature is sent to the internal combustion engine dedicated radiator 14, where heat is dissipated therein and the temperature thereof is lowered, and then returned to the internal combustion engine 2.

The power conversion device-dedicated radiator 16 is an elongated flat plate-shaped heat exchanger that is disposed on the front side of the vehicle with respect to the internal combustion engine-dedicated radiator 14, and the traveling wind of the vehicle impinges on the plate surface of the heat exchanger to heat the cooling liquid. It is designed to diffuse into the atmosphere. Further, the power conversion device case 8a and the power conversion device-dedicated radiator 16 are connected by an inflow pipe 16a and an outflow pipe 16b, and are configured to circulate a cooling liquid. That is, the cooling liquid that has cooled the power converter in the power converter case 8a and has risen in temperature flows into the radiator 16 dedicated to the power converter through the inflow pipe 16a. The inflowing cooling liquid dissipates heat in the radiator 16 for exclusive use of the power conversion device, and the cooling liquid whose temperature has dropped is returned to the power conversion device case 8a via the outflow pipe 16b to cool the power conversion device again. Further, since the radiator 16 dedicated to the power conversion device is arranged at substantially the same height as the power conversion device case 8a arranged above the internal combustion engine 2, the motor 4, etc., power is generated by the short inflow pipe 16a and the outflow pipe 16b. The converter-only radiator 16 and the power converter device case 8a can be connected.

The oil cooler 18 is an elongated flat plate heat exchanger arranged below the radiator 14 for an internal combustion engine, so that the running wind of the vehicle hits the plate surface of the heat exchanger and dissipates the heat of the cooling liquid to the atmosphere. Is configured. The oil cooler 18 and the motor 4 are connected by an inflow pipe 18a, and the oil cooler 18 and the generator 6 are connected by an outflow pipe 18b. Further, the generator 6 and the motor 4 are connected by the transfer pipe 18c. That is, the cooling liquid that has cooled the motor 4 and has increased in temperature flows into the oil cooler 18 via the inflow pipe 18a. The inflowing cooling liquid dissipates heat in the oil cooler 18, and the cooling liquid whose temperature has dropped is returned to the generator 6 via the outflow pipe 18b, and the generator 6 is cooled. The cooling liquid that has cooled the generator 6 is sent to the motor 4 via the transfer pipe 18c, and the motor 4 is cooled.

Further, the oil coolers 18 are arranged below the radiator 14 for internal combustion engine side by side, and the lower ends of the cases of the motor 4 and the generator 6 and the lower ends of the oil coolers 18 are located at substantially the same height. As a result, the oil cooler 18, the motor 4 and the generator 6 can be connected by the short inflow pipe 18a and the short outflow pipe 18b.

As shown by an imaginary line in FIG. 3, when the vehicle is equipped with an air conditioner (not shown), the radiator 22 for the air conditioner is the radiator 16 for the power converter in the front-rear direction of the vehicle. It is good to arrange between the radiator 14 for internal combustion engines.

Next, the flow of the cooling liquid and the energy in the vehicle-mounted cooling device 1 according to the embodiment of the present invention will be described with reference to FIG.
As described above, the vehicle-mounted cooling device 1 of the present embodiment is integrated with the vehicle drive device and includes the internal combustion engine 2 that generates power for driving the vehicle and the oil-cooled motor 4. There is. In addition, in the present embodiment, the power generated by the internal combustion engine 2 is temporarily stored in the lithium-ion battery 20, which is a storage battery, as electrical energy. That is, the oil-cooled generator 6 is driven by the rotary shaft power generated by the internal combustion engine 2, and the electric power generated by the generator 6 is a storage battery via the rectifier 8c (FIG. 5) in the power converter case 8a. It is stored in the lithium-ion battery 20. Furthermore, the electric energy stored in the lithium-ion battery 20 drives the motor 4, and this driving force is transmitted to the drive shaft 12 of the vehicle to drive the vehicle. On the other hand, when the vehicle is braked, the kinetic energy of the vehicle is regenerated as electric energy by the motor 4 and stored in the lithium ion battery 20 via the rectifier 8c in the power converter case 8a.

The motor 4 and the generator 6 are oil-cooled and are cooled by a common cooling system. That is, the oil-based cooling liquid (ATF-based refrigerant) that is the first cooling liquid circulates through the motor 4, the generator 6, and the oil cooler 18 that is the first cooling mechanism. To be cooled. As shown in FIG. 4, in the present embodiment, the cooling liquid that has cooled the generator 6 is sent to the motor 4, and the hot oil whose temperature has risen due to the cooling of the motor 4 is sent to the oil cooler 18 and cooled. .. Further, the cold oil which has been cooled by the oil cooler 18 and whose temperature has dropped is returned to the generator 6, and the generator 6 and the motor 4 are cooled. A fluorinated liquid such as hydrofluoroether may be used as the cooling liquid for cooling the motor 4 and the generator 6.

On the other hand, the internal combustion engine 2 and the power converter in the power converter case 8a are water-cooled and are cooled by separate cooling systems. That is, the internal combustion engine 2 is cooled by the internal combustion engine dedicated radiator 14, and the water-based cooling liquid (LLC refrigerant) circulates between the internal combustion engine 2 and the internal combustion engine dedicated radiator 14 to cool the internal combustion engine 2. Further, the power conversion device in the power conversion device case 8a is cooled by the power conversion device-dedicated radiator 16 that is the second cooling mechanism, and the water-based cooling liquid that is the second cooling liquid is used as the power conversion device case 8a and the power conversion device case 8a. The power conversion device is cooled by circulating between the converter-specific radiators 16. That is, the hot water whose temperature has risen by cooling the power conversion device is sent to the power conversion device-dedicated radiator 16 and cooled. Further, the chilled water cooled by the radiator 16 for exclusive use of the power conversion device and having its temperature lowered is returned to the power conversion device case 8a to cool the internal power conversion device.

Next, the connection structure of the motor 4, the generator 6, and the power conversion device case 8a in the vehicle-mounted cooling device 1 of the present embodiment will be described with reference to FIGS. 5 and 6.
FIG. 5 is a cross-sectional view showing the internal structures of the motor 4, the generator 6, and the power converter device case 8a. FIG. 6 is an enlarged cross-sectional view showing an enlarged connecting portion between the motor 4 and the power conversion device case 8a.

As shown in FIG. 5, the motor 4 has a motor case 4a, a rotor 4b housed in the motor case 4a, a stator 4c, and an output shaft 4d. The rotor 4b is connected to the output shaft 4d oriented in the horizontal direction, and is rotatably supported by the motor case 4a about a horizontal axis. The stator 4c is fixed to the motor case 4a, and is configured to rotate the rotor 4b by causing an alternating current to flow through a coil forming the stator 4c. On the other hand, during deceleration, the output shaft 4d is rotationally driven based on the kinetic energy of the vehicle. As a result, the rotor 4b is driven to rotate together with the output shaft 4d, so that an induced current is generated in the stator 4c, and the kinetic energy of the vehicle is regenerated as electric energy.

Further, a cooling liquid is contained in the motor case 4a, and the liquid level L of this cooling liquid is set to be substantially the same height as the lower end of the rotor 4b. Therefore, when the rotor 4b is rotated, the cooling liquid is splashed by the rotor 4b, and the cooling liquid is applied to the stator 4c and the rotor 4b in the motor case 4a. The heat of the stator 4c and the rotor 4b is taken by this cooling liquid, and the stator 4c and the rotor 4b are cooled. Further, in the present embodiment, the case of the reduction gear 10 provided adjacent to the motor case 4a and the motor case 4a communicate with each other, and the gear (not shown) in the case has the same cooling liquid as the motor 4. Cooled by. In this embodiment, the cooling liquid is directly put into the motor case 4a and the case of the reduction gear 10 to cool the stator 4c, the rotor 4b, and the gear. Therefore, it is possible to perform the cooling more strongly than the configuration in which the pipe for flowing the cooling liquid is arranged in the motor case to cool the stator and the rotor.

The generator 6 has a generator case 6a, a rotor 6b housed in the generator case 6a, a stator 6c, and an input shaft 6d. The rotor 6b is connected to an input shaft 6d oriented in the horizontal direction, and is supported rotatably about a horizontal axis with respect to the generator case 6a. The stator 6c is fixed to the generator case 6a, and when the rotor 6b is rotationally driven by the driving force of the internal combustion engine 2, an induction current flows through a coil that forms the stator 6c, and AC power is generated. ..

Further, the cooling liquid is contained in the generator case 6a, and the liquid level L of this cooling liquid is set to be substantially the same height as the lower end of the rotor 6b. Therefore, when the rotor 6b is rotated, the cooling liquid is splashed up by the rotor 6b and applied to the stator 6c and the rotor 6b in the generator case 6a, and the cooling liquid removes heat. As a result, the stator 6c and the rotor 6b are cooled. The liquid level L of the cooling liquid in the motor case 4a and the liquid level L in the generator case 6a are set to substantially the same height.

The cooling liquid in the generator case 6a is transferred to the motor case 4a via the transfer pipe 18c by an oil pump (not shown). Further, the cooling liquid in the motor case 4a is sent to the oil cooler 18 via the inflow pipe 18a by an oil pump (not shown), and the cooling liquid cooled in the oil cooler 18 is passed through the outflow pipe 18b to the generator. It is returned to the case 6a.

An inverter 8b and a rectifier 8c are housed in the power converter case 8a and are integrated as an electric drive system unit. The inverter 8b and the rectifier 8c are circuits including power semiconductor elements such as an IGBT (insulated gate bipolar transistor) for switching, a MOSFET (MOS field effect transistor), and a diode for rectification (above, not shown). It is composed of a substrate. Depending on the configuration of the electric drive system of the vehicle, a DC-DC converter for converting a DC voltage may be provided in the power conversion device case 8a.

Furthermore, since the power semiconductor element on the circuit board generates heat as it operates, a cooling liquid chamber 8d is provided in the power converter case 8a to cool it. An inflow pipe 16a and an outflow pipe 16b are connected to the cooling liquid chamber 8d, and a cooling liquid circulating through an oil cooler 18 is provided between the cooling liquid chamber 8d and the power conversion device-dedicated radiator 16 (FIG. 3). Different cooling liquids are circulated. In this way, by circulating the cooling liquid in the cooling liquid chamber 8d, the cooling liquid chamber 8d acts as a water jacket, and the inverter 8b and the rectifier 8c in the power conversion device case 8a are cooled. Further, the wall surface in the cooling liquid chamber 8d is formed flat so that the cooling liquid can efficiently flow in the cooling liquid chamber 8d.

Further, one end of the bottom surface of the power converter case 8a is fastened and fixed to the upper end of the motor case 4a of the motor 4 to be integrated. Further, the other end of the bottom surface of the power conversion device case 8a is fastened and fixed to the upper end of the generator case 6a of the generator 6 while straddling the reduction gear 10 and the internal combustion engine 2 to be integrated. As described above, in the present embodiment, the power conversion device case 8a, the motor case 4a, and the generator case 6a, which are separately configured, are fastened to each other to form an integrated case. A part or all of the case may be integrally molded.

Here, as described above, the electric power supplied from the lithium ion battery 20 is supplied to the motor 4 via the inverter 8b in the power conversion device case 8a. Therefore, the plurality of bus bars 24, which are conductors for supplying electric power from the inverter 8b to the motor 4, extend inside the integrated motor case 4a and power converter case 8a. Further, the AC power regenerated by the motor 4 charges the lithium ion battery 20 via the rectifier 8c. Therefore, the bus bar 24 extending inside the integrated motor case 4a and power converter case 8a is also used when supplying the AC power regenerated by the motor 4 to the rectifier 8c. As a result, a harness or the like that passes the outside of the motor case 4a and the power conversion device case 8a for exchanging electric power between the motor 4 and the power conversion device is not provided.

Similarly, the AC power generated by the generator 6 is charged in the lithium ion battery 20 via the rectifier 8c in the power converter case 8a. Therefore, the plurality of bus bars 26 (only one is shown), which are conductors for supplying the AC power generated by the generator 6 to the rectifier 8c, are also integrated inside the generator case 6a and the power converter case 8a. Extends to. As a result, a harness or the like passing through the outside of the generator case 6a and the power conversion device case 8a for exchanging electric power between the generator 6 and the power conversion device (rectifier 8c) is not provided.

Next, with reference to FIG. 6, the structure of the motor case 4a of the motor 4 and the connecting portion of the power converter case 8a will be described.
Although the structure of the connecting portion between the motor case 4a and the power conversion device case 8a will be described below, the connection portion between the generator case 6a and the power conversion device case 8a is similarly configured.

As shown in FIG. 6, at one end of the bottom surface of the power conversion device case 8a, a connection surface 28a on the power conversion device side for connecting the power conversion device case 8a and the motor case 4a is provided. On the other hand, a motor-side connection surface 30a for connecting the motor case 4a and the power conversion device case 8a is provided at the upper end of the motor case 4a on the reduction gear 10 side. An O-ring 32, which is a sealing material for preventing foreign matter from entering between the connecting surfaces 28a on the power converter side and the connecting surface 30a on the motor side, is arranged between these connecting surfaces. ..

Further, a connection passage 30b for passing the bus bar 24 is provided inside the motor case 4a. The connection passage 30b extends in a crank shape from the inside of the motor case 4a to the connection surface 30a and is opened at the connection surface. doing. That is, the connection passage 30b is configured to communicate the internal space 30c of the motor case 4a, which is the first space in which the rotor 4b and the stator 4c are housed, with the opening of the connection surface 30a. One end of the bus bar 24 is connected to the stator 4c in the internal space 30c of the motor case 4a and extends into the power converter case 8a.

Similarly, a connection passage 28b for passing the bus bar 24 is provided inside the power conversion device case 8a, and the connection passage 28b extends from the inside of the power conversion device case 8a to the connection surface 28a for connection. It has an opening on the surface. That is, the connection passage 28b is configured to connect the internal space 28c of the power conversion device case 8a, which is the second space in which the inverter 8b and the rectifier 8c are housed, to the opening of the connection surface 28a. Thus, the internal space 28c of the power converter case 8a is provided above the internal space 30c of the motor case 4a, and the inverter 8b, the rectifier 8c, etc. are provided in the internal space 28c of the power converter case 8a. It is arranged. The bus bar 24 extending from the inside of the motor case 4a enters the internal space 28c of the power conversion device case 8a through the connection passage 28b, and is connected to a circuit such as the inverter 8b and the rectifier 8c housed in the internal space 28c. ..

Further, as described above, the cooling liquid chamber 8d is formed inside the power conversion device case 8a, and the cooling liquid chamber 8d is located below the internal space 28c that houses the inverter 8b and the rectifier 8c. It is provided. Here, the power semiconductor elements (not shown) provided in the inverter 8b, the rectifier 8c, etc. are in contact with the upper surface of the metal plate 28d arranged to separate the internal space 28c from the cooling liquid chamber 8d. It is fixed. Therefore, the heat of the power semiconductor element is efficiently transferred to the cooling liquid in the cooling liquid chamber 8d via the metal plate 28d, and the inverter 8b, the rectifier 8c and the like can be efficiently cooled. In addition, in the present embodiment, a large number of cylinders formed so as to protrude downward are provided on the lower side surface of the metal plate 28d. With these columns, the contact area between the metal plate 28d and the cooling liquid in the cooling liquid chamber 8d can be increased, and the power semiconductor element mounted on the metal plate 28d can be efficiently cooled. Further, due to the cylinder formed on the lower surface of the metal plate 28d, the flow of the cooling liquid in the cooling liquid chamber 8d can be made turbulent, and heat can be more efficiently transferred from the metal plate 28d to the cooling liquid. it can.

In this way, the plurality of bus bars 24 extend through the inside of the case formed by integrating the motor case 4a and the power converter case 8a, and the motor 4 (the stator 4c thereof) and the inverter in the power converter case 8a. 8b, the rectifier 8c, etc. are electrically connected. Further, each bus bar 24 is formed by connecting a plurality of linear elongated conductor plates so as to pass through a connecting passage 30b extending in a crank shape. Although the connecting portion between the linear plates is exposed, the cover is attached after fastening the plates. In addition, each bus bar 24 is covered with an insulating material made of resin in order to prevent electric discharge between the bus bars 24, so that insulation between the bus bars 24 is ensured.

Further, a resin seal member 34 is arranged along the inside of the connection passage 30b, and seals between the internal space 28c of the power conversion device case 8a and the internal space 30c of the motor case 4a. That is, the seal member 34 is formed of an elastically deformable resin material, and the space between the inner wall surface of the connection passage 30b and the seal member 34 and the space between the outer peripheral surface of each bus bar 24 and the seal member 34 are liquid-tight. It is configured to seal. In the present embodiment, the bus bar 24 directly extends from the connection passage 28b of the power converter case 8a into the internal space 28c, but the bus bar 24 penetrates the cooling liquid chamber 8d and extends into the internal space 28c. The present invention can also be configured as follows. Also in this configuration, by sealing the periphery of the bus bar 24 with the seal member, it is possible to prevent the cooling liquid in the cooling liquid chamber 8d from being mixed with the cooling liquid in the motor case 4a.

In this way, by sealing the periphery of each bus bar 24 with the seal member 34, the cooling liquid for cooling the interior space 30c in which the stator 4c of the motor 4 is housed passes through the connection passage 30b to convert power. The invasion into the internal space 28c of the device case 8a can be suppressed. Further, even if the cooling liquid in the cooling liquid chamber 8d provided in the power conversion device case 8a leaks due to damage or the like, the cooling liquid is prevented from entering the internal space 30c of the motor case 4a. be able to. That is, it is possible to prevent the water-based cooling liquid in the cooling liquid chamber 8d of the power conversion device case 8a from leaking and mixing with the oil-based cooling liquid in the motor case 4a. Further, since the power conversion device case 8a is cooled by the cooling liquid circulated in the cooling liquid chamber 8d, dew condensation may occur on the inner wall surface of the connection passage 28b or the like. Even in such a case, the seal member 34 can prevent water generated by dew condensation from entering the internal space 30c of the motor case 4a.

In the present embodiment, the bus bar 24 directly extends from the connection passage 28b of the power converter case 8a into the internal space 28c, but the bus bar 24 penetrates the cooling liquid chamber 8d and extends into the internal space 28c. The present invention can also be configured as follows. Also in this configuration, by sealing the periphery of the bus bar 24 with the seal member, it is possible to prevent the cooling liquid in the cooling liquid chamber 8d and the cooling liquid in the motor case 4a from being mixed.

According to the vehicle-mounted cooling device 1 of the embodiment of the present invention, the motor 4 and the generator 6, which are rotary electric machines, and the inverter 8b and the rectifier 8c, which are power conversion devices, are cooled by different cooling liquids (FIG. 4). ). Therefore, it is possible to perform cooling more strongly than when air cooling is performed. Further, a bus bar that electrically connects the rotating electric machine and the power conversion device extends inside the integrated motor case 4a, generator case 6a, and power conversion device case 8a (FIGS. 5 and 6). As a result, it is not necessary to provide a harness outside the case for connecting the rotating electric machine and the power converter, and it is possible to avoid an increase in weight and a cost due to the harness. Further, according to the present embodiment, the seal member 34 suppresses the mixing of the cooling liquid for the rotary electric machine and the cooling liquid for the power conversion device (FIG. 6 ). Therefore, it is possible to prevent the first and second cooling liquids from being mixed with each other when the cooling liquid leaks while accommodating the rotating electric machine and the power conversion device in an integrated case, which causes a failure. can do.

In addition, according to the vehicle-mounted cooling device 1 of the present embodiment, the internal space 28c of the power conversion device case 8a is provided above the internal space 30c of the motor case 4a (FIG. 6), and therefore the weight is generally reduced. A rotating electric machine such as a large motor 4 can be arranged on the lower side, and the vehicle-mounted cooling device 1 can be stably arranged.

Further, according to the vehicle-mounted cooling device 1 of the present embodiment, the motor 4 and the generator 6, which are rotary electric machines, are oil-cooled (FIG. 4), so that the coil or the like can be directly cooled with oil. , Can effectively cool the rotating electrical machine.

In addition, according to the vehicle-mounted cooling device 1 of the present embodiment, the reduction gear 10 is cooled by the same cooling liquid as that of the motor 4 which is a rotating electric machine (FIG. 5). 4 can be used also, and the vehicle-mounted cooling device 1 can be downsized.

Furthermore, according to the vehicle-mounted cooling device 1 of the present embodiment, the generator 6 which is a rotary electric machine is powered by the internal combustion engine 2 (FIG. 4), so that electric power is generated without using an external power source. The lithium-ion battery 20 can be charged.

Further, according to the vehicle-mounted cooling device 1 of the present embodiment, the motor 4, the reduction gear 10, the internal combustion engine 2, and the generator 6 are arranged in this order in the width direction of the vehicle (FIG. 2), so that the vehicle is driven. The vehicle-mounted cooling device 1 integrated with the device can be configured compactly.

Although the embodiments of the present invention have been described above, various modifications can be made to the above-described embodiments. In the above-described embodiment, the vehicle-mounted cooling device 1 is integrated with the vehicle drive device and includes the motor as the rotating electric machine, but the vehicle-mounted cooling device 1 does not have a function of driving the vehicle. Can be applied. That is, the present invention can be applied to a vehicle-mounted cooling device that does not include an internal combustion engine, and can also be applied to a vehicle-mounted cooling device that includes either a generator or a motor. Further, in the above-described embodiment, the internal combustion engine drives the generator, and the drive shaft is not directly driven by the internal combustion engine, but the present invention is applied to the vehicle-mounted cooling device in which the drive shaft is driven by the power of the internal combustion engine. Can also be applied. The present invention can also be applied to a vehicle-mounted cooling device in which a battery is charged exclusively by an external power source.

1 In-vehicle cooling device 2 Internal combustion engine 4 Motor (rotary electric machine)
4a Motor case 4b Rotor 4c Stator 4d Output shaft 6 Generator (rotary electric machine)
6a Generator case 6b Rotor 6c Stator 6d Input shaft 8a Power converter case 8b Inverter (power converter)
8c Rectifier (power converter)
8d Coolant chamber 10 Reduction gear (reduction mechanism)
12 drive shaft 14 internal combustion engine dedicated radiator 16 power converter dedicated radiator (second cooling mechanism)
16a Inflow pipe 16b Outflow pipe 18 Oil cooler (first cooling mechanism)
18a Inflow pipe 18b Outflow pipe 18c Transfer pipe 20 Lithium ion battery 22 Radiator 24 Bus bar (conductor)
26 bus bar (conductor)
28a Connection surface 28b Connection passage 28c Internal space (second space)
28d Metal plate 30a Connection surface 30b Connection passage 30c Internal space (first space)
32 O ring 34 seal member

Claims (8)

A cooling device for cooling an electric system of a vehicle,
A case,
A rotating electric machine housed in a first space inside the case;
A power conversion device housed in a second space inside the case, which is different from the first space;
A first cooling mechanism for cooling the rotating electric machine in the first space using a first cooling liquid;
A second cooling mechanism that cools the power conversion device in the second space by using a second cooling liquid different from the first cooling liquid;
A conductor extending inside the case so as to electrically connect the rotating electric machine and the power conversion device,
A seal member that seals between the first space and the second space,
The seal member suppresses mixing of the first cooling liquid in the first space and the second cooling liquid in the second space with each other. .. The vehicle-mounted cooling device according to claim 1, wherein the second space accommodating the power conversion device is provided above the first space accommodating the rotating electric machine. The vehicle-mounted cooling device according to claim 1 or 2, wherein the first cooling mechanism for cooling the rotary electric machine is an oil cooling type, and the second cooling mechanism for cooling the power conversion device is a water cooling type. .. The vehicle-mounted cooling device according to claim 1 or 2, wherein the first cooling liquid used for cooling the rotating electric machine is a fluorinated liquid. 5. The rotary electric machine includes a motor, and further has a reduction mechanism for reducing the rotational output of the motor, and the reduction mechanism is cooled by the first cooling liquid together with the motor. The vehicle-mounted cooling device according to item 1. The vehicle-mounted cooling device according to any one of claims 1 to 5, wherein the rotary electric machine includes a generator, and further has an internal combustion engine that gives power to the generator. The rotary electric machine includes a motor and a generator, and further includes a reduction mechanism that reduces the rotation output of the motor, and an internal combustion engine that applies power to the generator. The motor, the reduction mechanism, and the internal combustion engine. And the generator is arranged in this order in the width direction of the vehicle, the in-vehicle cooling device according to any one of claims 1 to 4. The in-vehicle cooling device according to any one of claims 1 to 7, wherein the power conversion device includes at least one of an inverter that converts direct current into alternating current and a DC-DC converter that converts direct current voltage.

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