JP2020083180A - Electric drive module - Google Patents

Abstract

To provide an electric drive module capable of suppressing enlargement of the body size.SOLUTION: An electric drive module 100 includes a motor, a power conversion circuit for driving the motor, and a gear device 200. The electric drive module 100 includes a housing 40 for accommodating the motor and the power conversion circuit in an integrated manner, in which a cooling channel in which a cooling medium for cooling the motor and the power conversion circuit flows is provided. The housing 40 includes an inflow port 31 for a cooling medium to the cooling channel, and an outflow port 32 for a cooling medium from the cooling channel, which are provided in a protruding manner. The gear device 200 includes a deceleration part 210 having a reduction gear connected to a rotation shaft of the motor, and a differential part 220 having a differential gear to which an output shaft of the reduction gear is connected, and is fixed to the housing 40. The inflow port 31 and the outflow port 32 are provided at a position facing the gear device 200.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to electric drive modules.

BACKGROUND ART Conventionally, as an example of an electric drive module, there is a power transmission device for an electric vehicle disclosed in Patent Document 1. A power transmission device for an electric vehicle includes a motor, an inverter, a first gear reducer, and the like.

Japanese Patent No. 5943033

By the way, although not a conventional technique, the electric drive module may have a configuration in which a motor and a power conversion circuit are integrally housed in a housing. Further, the motor and the power conversion circuit generate heat when operating. Therefore, a configuration in which the housing is provided with a water passage through which cooling water for cooling the motor and the electric power conversion circuit can be considered.

In this case, in the electric drive module, the inflow port for introducing the refrigerant into the water channel in the housing and the outflow port for outflowing the refrigerant flowing in the water channel in the housing to the outside of the housing protrude from the housing. It is provided. However, when the inflow port and the outflow port are provided so as to project from the housing, the electric drive module has a problem in that the physical size of the electric drive module is increased.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide an electric drive module that can suppress an increase in body size.

In order to achieve the above object, the present disclosure provides
Motors (23-25),
A power conversion circuit (12) for driving the motor,
A cooling water channel (13, 21) through which a refrigerant for cooling the motor and the power conversion circuit flows,
A housing (40) in which the motor and the power conversion circuit are integrally housed and in which a cooling water passage is provided;
An inlet (31) for the refrigerant to the cooling water channel, which is provided so as to project from the housing;
An outlet (32) for the refrigerant from the cooling water channel provided so as to project from the housing;
A reduction unit (210) including a speed reducer connected to a rotating shaft (23) of a motor and a differential unit (220) including a differential device connected to an output shaft of the speed reducer are fixed to the housing. And a gear device (200),
The inflow port and the outflow port are provided at positions facing the gear device.

As described above, in the present disclosure, even if the inlet and the outlet are provided so as to project from the housing, the inlet and the outlet are arranged to face the gear device. Therefore, according to the present disclosure, it is possible to suppress the increase in size due to the protrusion of the inflow port and the outflow port.

It should be noted that the claims and the reference numerals in parentheses described in this section indicate the corresponding relationship with the specific means described in the embodiments described below as one aspect, and the technical scope of the present disclosure. Is not limited.

It is a top view showing a schematic structure of an electric drive module in a 1st embodiment. It is a side view which shows the schematic structure of the electric drive module in 1st Embodiment. It is a side view from the III arrow direction of FIG. It is a perspective view which shows the schematic structure of the terminal block in 1st Embodiment. It is a side view which shows the schematic structure of the power module part in 1st Embodiment. It is sectional drawing which shows schematic structure of the electric drive module in 1st Embodiment. It is a top view showing a schematic structure of a motor waterway in a 1st embodiment. It is a top view which shows schematic structure of the circuit side cooling part in 1st Embodiment. It is a block diagram showing a schematic structure of a cooling system in a 1st embodiment. It is a side view which shows the schematic structure of the electric drive module in 2nd Embodiment.

Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each form, parts corresponding to the items described in the preceding form may be assigned the same reference numerals and overlapping description may be omitted. In each mode, when only a part of the configuration is described, the other modes described above can be referred to and applied to other parts of the configuration.

In the following, the three directions orthogonal to each other are referred to as the X direction, the Y direction, and the Z direction. Further, the arrow direction indicating the Y direction in FIG.

(First embodiment)
The electric drive module 100 of the present embodiment will be described with reference to FIGS. 1 to 9. In the present embodiment, as an example, the electric drive module 100 mounted in a vehicle is adopted. The electric drive module 100 is a module that is mounted on a vehicle and electrically drives traveling wheels of the vehicle. The vehicle may be a hybrid vehicle including a motor and an engine as a power source, or an electric vehicle including only a motor as a power source. The motor here includes motor components 23 to 25, which will be described later.

As shown in FIG. 1, FIG. 2, FIG. 3, etc., the electric drive module 100 mainly includes a power conversion unit 10, a motor unit 20, and a gear device 200. Further, the electric drive module 100 includes a housing 40 that accommodates the components of the power conversion unit 10 and the components of the motor unit 20, the terminal block 50 for electrically connecting the power conversion unit 10 and the motor unit 20, and the like. Is equipped with.

The electric drive module 100 also includes a cooling water passage through which a coolant for cooling the heat generating components provided in the power conversion unit 10 and the motor unit 20 flows. As will be described later in detail, the cooling water passage includes a circuit side cooling unit 13, a condenser water passage 14c, a motor water passage 21 and the like. The circuit side cooling unit 13 and the motor water channel 21 correspond to the cooling water channel in the claims. Further, in this embodiment, cooling water is used as the refrigerant. However, the present disclosure is not limited to this. The refrigerant may be a liquid other than cooling water.

The electric drive module 100 drives the rotor 24 included in the motor unit 20 by the power conversion unit 10. Then, the electric drive module 100 transmits the rotation of the rotor 24 to the traveling wheels via the gear device 200 to rotate the traveling wheels. In this way, the electric drive module 100 drives the vehicle. Note that, in FIGS. 2, 3, and 6, the gear device 200 is omitted in order to make the configurations of the power conversion unit 10 and the motor unit 20 easy to understand.

<About the housing>
As shown in FIG. 2, FIG. 3, FIG. 6, etc., the housing 40 has a first housing part 41 in which the power conversion part 10 is arranged and a second housing part 42 in which the motor part 20 is arranged. .. The housing 40 also includes a first cover 43 that covers one ends of the first housing 41 and the second housing portion 42, and a second cover 44 that covers a recess of the first housing portion 41.

The first housing portion 41 and the second housing portion 42 are mainly composed of a metal such as Al. Therefore, the first housing part 41 and the second housing part 42 can be manufactured by an aluminum die casting method or the like. The first housing part 41 and the second housing part 42 may be configured as separate bodies and may be joined together, or may be integrally configured. In the present embodiment, an example in which the first housing part 41 and the second housing part 42 are configured as an integrated body is adopted.

The first housing part 41 is provided with a recess serving as a housing chamber for housing the power conversion part 10. An opening communicating with a circuit side inflow port 13a, a circuit side outflow port 13b, a condenser inflow port 14a, and a condenser outflow port 14b, which will be described later, is formed at the bottom of this recess. Further, the first housing part 41 is formed with a first connecting part 14d and a second connecting part 14e which will be described later. The opening, the first connecting portion 14d, and the second connecting portion 14e are provided by making a hole in the first housing portion 41 with a drill, a laser, or the like. In the present embodiment, as an example, the circuit side inlet 13a, the circuit side outlet 13b, the condenser inlet 14a, the condenser outlet 14b, the first connecting portion 14d, and the second connecting portion 14e form a part of the cooling water passage. We have adopted an example that does not.

In the present embodiment, an example in which the first connecting portion 14d and the second connecting portion 14e are provided in the first housing portion 41 is adopted. However, the present disclosure is not limited to this. The first connecting portion 14d and the second connecting portion 14e may be provided in the housing 40, and may be provided in the second housing portion 42 or the first housing 41 and the second housing 42.

The first housing portion 41 is open at a position facing the recess, and the recess is closed by the second cover 44 in a state where the power conversion unit 10 is arranged in the recess. The second cover 44 is fixed to the first housing portion 41 by a fixing member such as a screw. The second cover 44 can be made of the same material as the first housing portion 41.

The second housing portion 42 is a motor arrangement portion 45 for accommodating the motor shaft 23, the rotor 24, and the stator 25, which are motor constituent elements included in the motor portion 20, and cooling for cooling the motor constituent elements 23 to 25. A motor water passage 21 through which water flows and an outlet water passage 22 are formed. In this embodiment, as an example, the motor water passage 21 and the outlet water passage 22 form part of the cooling water passage.

The motor water passage 21 corresponds to a motor-side cooling unit that cools the motor. The motor water passage 21 and the outlet water passage 22 may be provided in the housing 40, and may be provided in the first housing portion 41 or the first housing 41 and the second housing 42.

The motor placement portion 45 is a cylindrical housing chamber for housing the motor components 23 to 25. The motor placement portion 45 is provided along the motor shaft 23 placed in the motor placement portion 45. Therefore, it can be said that the second housing portion 42 is provided with the motor placement portion 45 which is a cylindrical hole for housing the motor components 23 to 25. In this embodiment, the motor placement portion 45, which is a cylindrical hole extending in the X direction, is used.

As shown in FIGS. 6 and 7, the motor water passage 21 is provided around the motor arrangement portion 45 with the motor shaft 23 as an axis. Note that FIG. 7 shows the configuration of the motor water passage 21 when viewed from the direction of the arrow VII in FIG. In FIG. 7, in order to clarify the positional relationship between the motor water passage 21 and the motor arrangement portion 45, the members forming the second housing portion 42 are omitted.

The motor water passage 21 is not provided over the entire circumference of the motor placement portion 45, but is an annular water passage with a part cut off. Therefore, it can be said that the second housing portion 42 is provided with the motor water passage 21 that is an annular hole that is partially interrupted around the motor placement portion 45. In other words, the second housing portion 42 is provided with the motor water passage 21 over substantially the entire circumference of the motor placement portion 45 with the motor shaft 23 as an axis.

The motor components 23 to 25 are arranged in the motor arrangement section 45 as described above. Therefore, it can be said that the second housing portion 42 is provided with the motor water passage 21, which is an annular hole, a part of which is interrupted, around the motor components 23 to 25. Therefore, it can be said that the second housing portion 42 is provided with a wall that separates the motor placement portion 45 and the motor water passage 21 between the motor placement portion 45 and the motor water passage 21.

Further, as shown in FIG. 6, the motor water passage 21 is provided around the motor constituent elements 23 to 25, and a part thereof is arranged between the motor constituent elements 23 to 25 and the circuit side water passage 13c. That is, a part of the motor water passage 21 including the apex in the Y direction is arranged between the motor components 23 to 25 and the circuit side water passage 13c. Further, a part of the motor water passage 21 is a part of the second housing portion 42 arranged between the motor components 23 to 25 and the circuit side water passage 13c. It can be said that it faces the circuit-side water passage 13c. The circuit side water passage 13c will be described later in detail.

As a result, the electric drive module 100 allows the motor water channels 21 to be provided around substantially the entire circumference of the motor components 23 to 25 as compared with the case where the motor water channels 21 are not provided between the motor components 23 to 25 and the circuit side water channel 13c. It is easier to install. Therefore, the electric drive module 100 can improve the cooling performance of the motor constituent elements 23 to 25 as compared with the case where the motor water conduit 21 is not provided between the motor constituent elements 23 to 25 and the circuit side water conduit 13c. Further, the electric drive module 100 can improve the space efficiency, and the size of the electric drive module 100 can be reduced.

As will be described later in the present disclosure, the inflow port 31 and the outflow port 32 are provided at positions facing the gear device 200. However, according to the present disclosure, even if the inflow port 31 and the outflow port 32 are not provided at positions facing the gear device 200, a part of the motor water passage 21 is provided between the motor components 23 to 25 and the circuit side water passage 13c. The above-mentioned effects can be obtained by being arranged in the.

The motor water passage 21 communicates with a circuit side outlet 13b, which will be described later, and also communicates with an outlet 32 via an outlet water passage 22. That is, as shown in FIG. 7, the motor water channel 21 is provided with a portion that communicates with the circuit side outlet 13b on one end side and the outlet water channel 22 (outlet port 32) on the other end side. A portion communicating with is provided. Therefore, it can be said that the circuit side outlet 13b and the outlet water passage 22 communicate with each other via the motor water passage 21. In FIG. 6, reference numeral 32 is given to the position where the outlet 32 is provided.

In this way, the cooling water flows into the motor water passage 21 from the circuit side cooling unit 13. Then, the cooling water flowing into the motor water passage 21 flows through the motor water passage 21 from one end side to the other end side of the motor water passage 21 and flows out to the outflow port 32 via the outlet water passage 22. Further, since the motor water passage 21 is provided in the second housing portion 42, the cooling water flows through the motor water passage 21 and is thereby cooled by the cooling water.

The motor water passage 21 and the outlet water passage 22 are provided by making a hole in the second housing portion 42 with a drill, a laser, or the like. Therefore, the motor water passage 21 and the outlet water passage 22 are holes provided in the second housing portion 42. Further, it can be said that the motor water passage 21 and the outlet water passage 22 are formed by the second housing portion 42.

The first cover 43 is provided on one end of the first housing part 41 and the second housing part 42, that is, on the end part side in the extension direction of the motor shaft 23. The first cover 43 is fixed to the first housing portion 41 and the second housing 42 by a fixing member such as a screw. The first cover 43 can be made of the same material as the first housing part 41 and the second housing 42.

<About the terminal block>
As shown in FIG. 2, between the first housing part 41 and the second housing part 42 and the first cover 43, a housing chamber for housing the terminal block 50 is formed. The terminal block 50 is a member for electrically connecting the stator 25 and the power module unit 11 described later.

As shown in FIGS. 2 and 4, the terminal block 50 includes an insulating electrical insulating portion 51, a conductive circuit-side terminal 52, a conductive motor-side terminal 53, and the like. In the terminal block 50, a circuit-side terminal 52 and a motor-side terminal 53, which are electrically connected, are fixed to the electrical insulating portion 51. In the terminal block 50, the circuit side terminals 52 are connected to the power module section 11 (the wiring board 12a of the circuit section 12) described later, and the motor side terminals 53 are connected to the stator 25. The terminal block 50 is covered with the first cover 43 while being connected to the power module unit 11 and the stator 25.

As described above, in the present embodiment, the terminal block 50 having the above-described configuration is adopted. However, in the present disclosure, the power module unit 11 and the stator 25 may be electrically connected, and the terminal block 50 may not be provided.

<Regarding inlet and outlet and cooling system>
As shown in FIG. 2, the housing 40 has an inflow port 31 for allowing the cooling water to flow into the cooling water channels such as the circuit side cooling unit 13, the condenser water channel 14c, and the motor water channel 21, and the cooling water is discharged from the cooling water channel. And an outlet 32 for The inflow port 31 and the outflow port 32 are provided so as to project with respect to the housing 40.

Further, as shown in FIG. 9, the electric drive module 100 is connected to the heat exchanger 400 and the water pump 500 via piping. That is, in the electric drive module 100, the inflow port 31 is connected to the water pump 500 via the pipe, and the outflow port 32 is connected to the heat exchanger 400 via the pipe. Cooling water that has undergone heat exchange (cooling) in the heat exchanger 400 is supplied to the inflow port 31 by the water pump 500. The cooling water that has flowed through the circuit-side cooling unit 13, the condenser water passage 14c, the motor water passage 21, and the like is discharged from the outlet 32 to the heat exchanger 400. In this way, the cooling water is circulated through the heat exchanger 400, the circuit side cooling unit 13, the condenser water passage 14c, the motor water passage 21 and the like by the water pump 500.

For the inflow port 31, for example, a tubular member having a through hole can be adopted. The inflow port 31 is provided so as to be inclined obliquely upward with respect to the housing 40. That is, the inflow port 31 is arranged above the end portion on the opposite side of the housing 40 from the connection portion with the housing 40. By the way, as shown in FIG. 2, the electric drive module 100 may be mounted in a vehicle such that the motor unit 20 is lower than the power conversion unit 10 in the vertical direction. In this mounted state, the electric drive module 100 is provided with the inflow port 31 so as to be inclined obliquely upward with respect to the housing 40 as described above, so that the cooling liquid is supplied when the cooling liquid is supplied from the inflow port 31. Since it is not necessary to supply against the gravity, it becomes easier to supply the cooling liquid. That is, the electric drive module 100 can supply the cooling liquid from the inflow port 31 without reducing the flow velocity, and thus can realize excellent cooling performance. However, the present disclosure is not limited to this.

Furthermore, the outflow port 32 is arranged above the inflow port 31 in the stacking direction of the circuit unit 12 and the motor components 23 to 25. In other words, the inflow port 31 is arranged below the outflow port 32 in the vertical direction.

In the housing 40, the cylindrical motor placement portion 45 is formed as described above. Therefore, in the housing 40, as shown in FIG. 6, the thickness of the facing portion of the motor placement portion 45 in the Y direction is different. That is, the housing 40 has portions having different thicknesses in the Z direction. The thickness corresponds to the distance between the motor placement portion 45 and the circuit side water passage 13c. Further, the housing 40 is desired to have a small physical size in the stacking direction while stacking the circuit section 12 and the motor constituent elements 23 to 25. Therefore, in the housing 40, it is preferable that the space between the motor placement portion 45 and the circuit side water passage 13c be as narrow as possible. The physical size of the housing 40 in the stacking direction can also be said to be the physical size of the electromechanical integrated structure section in the stacking direction, which will be described later.

Since the outlet water channel 22 and the first connecting portion 14d described later are formed by forming a hole in the housing 40, it is preferable to form the thick portion in the housing 40 in consideration of workability (preferable condition 1). In this case, the inflow port 31 and the outflow port 32 are provided in the thick portion of the housing 40. That is, the inflow port 31 and the outflow port 32 are formed so as to project in the facing region between the motor components 23 to 25 and the circuit portion 12 on the wall surface (outer wall surface) of the housing 40. Furthermore, it is preferable that the motor water passage 21 be provided so as to cover the periphery of the motor placement portion 45 as much as possible because the cooling performance of the motor constituent elements 23 to 25 can be improved (preferable condition 2).

By arranging the inflow port 31 below the outflow port 32 in the vertical direction, these two preferable conditions can be satisfied. That is, in the electric drive module 100, by disposing the inflow port 31 below the outflow port 32 in the vertical direction, it is possible to prevent the workability of the outlet water channel 22 and the first connecting portion 14d from being lowered, The cooling performance of the motor components 23 to 25 can be improved. Further, the electric drive module 100 arranges the inflow port 31 below the outflow port 32, so that the circuit unit 12 and the motor can be arranged more than the configuration in which the inflow port 31 is not located below the outflow port 32. The distance in the Y direction between the components 23 to 25 can be shortened. Therefore, the electric drive module 100 can reduce the size of the electromechanical integrated structure in the stacking direction. Further, as shown in FIG. 6, when the circuit side inlet 13a and the circuit side outlet 13b are arranged in a region where the motor placement portion 45 and the circuit side water passage 13c are relatively wide, a dead space is effectively created. It is preferable because it can be used. Further, as shown in FIG. 6, the outlet water passage 22 has a circuit side outlet 13b (circuit side water passage 13c) in the Y direction in order to reduce the size of the electromechanical integrated structure described later in the Y direction. It is preferably formed between the motor water passage 21 and the inlet of the cooling water. However, the present disclosure is not limited to this.

Further, as shown in FIG. 2 and the like, in the present embodiment, as an example, an example in which the inflow port 31 and the outflow port 32 are provided adjacent to each other on the same wall surface of the housing 40 is adopted. The inflow port 31 and the outflow port 32 are preferably provided adjacent to each other. As a result, the electric drive module 100 can facilitate the routing of the pipe connecting the inlet 31 and the water pump 500 and the pipe connecting the outlet 32 and the heat exchanger 400. it can. Further, this configuration is particularly effective when the heat exchanger 400 and the water pump 500 are adjacent to each other. However, the present disclosure is not limited to this, and the inflow port 31 and the outflow port 32 may not be provided adjacent to each other.

Further, the inflow port 31 and the outflow port 32 are preferably provided on the same wall surface of the housing 40. This makes it easier for the electric drive module 100 to provide the motor water passage 21 over substantially the entire circumference of the motor components 23 to 25, and is preferable because the cooling performance of the motor components 23 to 25 can be improved.

<About the power converter>
The power conversion unit 10 mainly has a power module unit 11 and a capacitor unit 14. In the present embodiment, as an example, the power conversion unit 10 having the capacitor unit 14 is adopted. However, the power conversion unit 10 may not have the capacitor unit 14.

The power module unit 11 has a circuit unit 12 and a circuit-side cooling unit 13. The circuit unit 12 has a wiring board 12a and a circuit element 12b. As shown in FIGS. 2 and 6, the circuit section 12 is stacked on the motor components 23 to 25 in the direction orthogonal to the motor shaft 23. In the present embodiment, the circuit parts 12 stacked in the Y direction are adopted for the motor components 23 to 25. Further, the circuit section 12 is arranged in parallel with the motor shaft 23 in the X direction.

As shown in FIG. 5, the circuit section 12 may have a circuit case that houses the wiring board 12a and the circuit element 12b. As an example, the present embodiment adopts an example in which a wiring board 12a and a circuit element 12b are housed in a circuit case.

The wiring board 12a is formed, for example, on an insulating substrate containing resin as a main component and conductive wiring. On the other hand, the circuit element 12b is a switching element whose main component is a semiconductor such as Si or SiC. As the switching element, MOSFET, IGBT or the like can be adopted. RC-IGBT can be adopted as the IGBT. However, the materials of the insulating substrate and the switching element are not limited to the above.

In the circuit section 12, the circuit element 12b is mounted on the wiring board 12a in a state in which the electrodes of the circuit element 12b and the wiring of the wiring board 12a are electrically connected via a conductive member. A plurality of circuit elements 12b are mounted on the wiring board 12a. The wiring board 12a has a main surface intersecting the thickness direction of the wiring board 12a and a surface opposite to the main surface, and the circuit element 12b is mounted on the main surface. This main surface can be said to be a mounting surface. The circuit element 12b may be mounted not only on the main surface of the wiring board 12a but also on the opposite surface. As described above, in the circuit section 12, the wiring board 12a and the circuit element 12b are electrically connected to form an inverter circuit as a drive circuit for driving the motor. The circuit unit 12 corresponds to a power conversion circuit.

It should be noted that the wiring board 12a may be mounted with an element that constitutes a circuit, which is different from the switching element. Further, the power module unit 11 may have a converter circuit in addition to the inverter circuit.

As the circuit case, a box-shaped member that includes a bottom portion and an annular wall portion that is continuously formed with respect to the bottom portion and has an opening provided at a position facing the bottom portion can be adopted. Then, the circuit case is closed with a lid in a state where the wiring board 12a and the circuit element 12b are accommodated. That is, it can be said that the wiring board 12a and the circuit element 12b are arranged in the accommodation space formed by the circuit case and the lid. This lid can employ the second cover 44 or another member different from the second cover 44.

The circuit-side cooling unit 13 is a portion that is in communication with the motor water channel 21 and that is arranged upstream of the motor water channel 21 and that cools the circuit unit 12. As shown in FIGS. 5 and 6, the circuit section 12 is laminated in the circuit-side cooling section 13. The circuit-side cooling unit 13 is fixed to the circuit case with a fixing member such as a screw or an adhesive in a state of being in contact with the bottom of the circuit case. The circuit-side cooling unit 13 is provided in a facing region on the opposite surface of the wiring board 12a. Therefore, the circuit-side cooling unit 13 cools the circuit unit 12 from the opposite surface side of the wiring board 12a.

The stacking direction coincides with the thickness direction of the wiring board 12a, for example. Also, the stacking direction matches the Y direction. Therefore, it can be said that the circuit-side cooling unit 13 is provided below the circuit unit 12 in the stacking direction.

In the present embodiment, an example in which the circuit side cooling unit 13 and the circuit case are separate bodies is adopted. However, the present disclosure is not limited to this, and can be adopted even if the circuit-side cooling unit 13 and the circuit case are integrated. When the circuit case is separate from the circuit-side cooling unit 13, a heat-transfer member such as heat-dissipating grease having good thermal conductivity may be provided between the circuit case and the circuit-side cooling unit 13.

As shown in FIG. 8, the circuit-side cooling unit 13 has a circuit-side inlet 13a, a circuit-side outlet 13b, a circuit-side water passage 13c, a partition 13d, and a water passage wall 131. Note that FIG. 8 is a diagram of the circuit-side cooling unit 13 viewed from the motor unit 20 side. Further, in FIG. 8, the internal structure of the water channel wall portion 131 such as the circuit side water channel 13c and the partition portion 13d is understood.

The water channel wall portion 131 is a box-shaped member composed mainly of metal. The water channel wall portion 131 has a circuit side water channel 13c in which cooling water flows as an internal space. That is, in the circuit-side cooling unit 13, the area surrounded by the water channel wall portion 131 is configured as the circuit-side water channel 13c. Therefore, the water channel wall portion 131 can be said to be a wall portion that defines the circuit side water channel 13c. The circuit side water passage 13c is a water passage for cooling water. Moreover, it can be said that the circuit side cooling part 13 includes the circuit side water channel 13c arranged between the circuit part 12 and the motor components 23 to 25.

By the way, when the circuit unit 12 and the motor components 23 to 25 are operating, the temperature of the motor components 23 to 25 tends to become higher than that of the circuit unit 12. Therefore, in the present embodiment, as an example, an example in which the circuit side water passage 13c is arranged upstream of the motor water passage 21 is adopted. That is, the circuit-side water passage 13c is supplied with the cooling water cooled by the heat exchanger 400 before the motor water passage 21. Thereby, the electric drive module 100 can suppress the refrigerant heated by the motor components 23 to 25 from flowing around the circuit unit 12. Therefore, the electric drive module 100 can efficiently cool the circuit unit 12 and the motor components 23 to 25.

The circuit-side cooling unit 13 may have a configuration in which the bottom of the circuit case is used as one surface that defines the circuit-side water passage 13c. In this case, the circuit side water passage 13c is configured as a region surrounded by the water passage wall portion 131 and the circuit case. Therefore, in the circuit-side cooling unit 13, a portion of the water channel wall portion 131 that is in contact with the circuit case is provided in an annular shape.

The water channel wall portion 131 is provided with a circuit side inflow port 13a for allowing cooling water to flow into the circuit side water channel 13c, and a circuit side outflow port 13b for causing cooling water to flow out from the circuit side water channel 13c. The circuit side inlet 13a and the circuit side outlet 13b are holes that penetrate a part of the water channel wall portion 131. Therefore, the water channel wall portion 131 communicates with the inside (the circuit side water channel 13c) and the outside by the circuit side inlet 13a and the circuit side outlet 13b. The circuit-side inlet 13a and the circuit-side outlet 13b are provided so as to project from the periphery of the water channel wall 131. That is, the circuit side inlet 13a and the circuit side outlet 13b are provided so as to project to the side opposite to the circuit side water passage 13c. As described above, in this embodiment, the cylindrical circuit-side inlet 13a and the circuit-side outlet 13b, which are open at both ends, are employed.

The circuit-side inlet 13a and the circuit-side outlet 13b are provided on the side of the water channel wall 131 opposite to the circuit case. That is, it can be said that the circuit-side cooling unit 13 is provided with the circuit-side inlet 13a and the circuit-side outlet 13b on the lower surface (bottom surface) in the stacking direction. Further, it can be said that the circuit-side cooling unit 13 is provided with the circuit-side inlet 13a and the circuit-side outlet 13b not on the circuit unit 12 side but on the motor constituent elements 23 to 25 side of the circuit-side water passage 13c. Therefore, in the circuit side cooling unit 13, cooling water flows into the circuit side water passage 13c from the circuit side inlet 13a from the bottom to the top, and from the circuit side water passage 13c to the circuit side outlet 13b from the top to the bottom. The cooling water is configured to flow out.

The circuit-side inlet 13a communicates with the condenser water passage 14c via the second connecting portion 14e. The circuit side outlet 13b communicates with the motor water passage 21. Therefore, the circuit side water passage 13c is configured such that the cooling water flowing through the condenser water passage 14c flows through the second connecting portion 14e and the circuit side inlet 13a. Further, the cooling water flowing through the circuit side water passage 13c is configured to flow into the motor water passage 21 through the circuit side outlet 13b.

As will be described later in detail, in the present embodiment, as an example, the circuit side water passage 13c into which the cooling water flows in via the condenser water passage 14c is adopted. However, the present disclosure is not limited to this, and can be adopted even for the circuit side water passage 13c in which the cooling water flows into the circuit side water passage 13c without passing through the condenser water passage 14c. The opening shapes of the circuit side inlet 13a and the circuit side outlet 13b are not particularly limited.

Since the circuit-side cooling unit 13 cools the circuit unit 12 from the opposite surface side of the wiring board 12a as described above, it is preferable that the circuit-side cooling unit 13 be configured so that the cooling water flows in the entire opposing region of the opposite surface. For this reason, it is preferable that the circuit-side cooling section 13 be provided with the circuit-side water passage 13c over the entire opposite region of the opposite surface. That is, it is preferable that the circuit-side water passage 13c have a width equal to or larger than the facing area on the opposite surface. The width here corresponds to the area in the XZ plane.

Further, the circuit side inlet 13a and the circuit side outlet 13b are arranged diagonally. By doing so, the circuit-side cooling unit 13 allows the cooling water to flow more easily throughout the circuit-side water passage 13c than when the circuit-side inlet 13a and the circuit-side outlet 13b are provided adjacent to each other. Become. Therefore, the circuit side cooling unit 13 can improve the cooling performance of the circuit unit 12. In the circuit side water passage 13c, for example, as shown by a straight arrow in FIG. 8, the cooling water flowing from the circuit side inlet 13a flows toward the circuit side outlet 13b.

Further, in the present embodiment, as shown in FIG. 8, in order to facilitate the flow of the cooling water over the entire area of the circuit side water passage 13c, the flow of the cooling water from the circuit side inlet 13a to the circuit side outlet 13b is facilitated. The circuit-side cooling unit 13 having the partition 13d is used. The partition portion 13d is a portion protruding from the periphery. Also by this, the circuit side cooling unit 13 can improve the cooling performance of the circuit unit 12.

As described above, in the circuit-side cooling unit 13, the circuit-side water passage 13c is provided with the circuit-side inlet 13a and the circuit-side outlet 13b on the motor components 23 to 25 side. On the other hand, as described above, the motor water passage 21 is partially disposed between the motor components 23 to 25 and the circuit side water passage 13c (circuit portion 12). The motor water passage 21 communicates with one of the circuit side inlet 13a and the circuit side outlet 13b (here, the circuit side outlet 13b).

Therefore, the electric drive module 100 can connect the motor water passage 21 and the circuit-side cooling unit 13 between the motor components 23 to 25 and the circuit unit 12. Therefore, the electric drive module 100 can simplify the water channel structure for connecting the motor water channel 21 and the circuit-side cooling unit 13.

That is, the electric drive module 100 arranges a part of the motor water passage 21 between the motor components 23 to 25 and the circuit-side cooling unit 13 and at the same time places the motor water passage 21 not between the motor and the circuit-side water passage. It is also conceivable that the circuit and the circuit side cooling unit 13 are communicated with each other. However, in this configuration, the water channel configuration for connecting the motor water channel 21 and the circuit-side cooling unit 13 is more complicated than that of the electric drive module 100. The water channel has a larger volume when the structure is complicated than when the structure is simple. Therefore, in the electric drive module 100, when the water channel structure provided in the housing 40 becomes complicated, the physique of the housing 40 becomes larger than when the water channel structure is simple.

However, since the electric drive module 100 can simplify the water channel structure, it is possible to prevent the size of the housing 40 from increasing. Therefore, the electric drive module 100 can prevent the physical size from becoming larger than in the case where the water channel configuration for communicating the motor water channel 21 and the circuit-side cooling unit 13 is complicated. Further, it can be said that the electric drive module 100 can improve the space efficiency and can reduce the size of the electric drive module 100.

However, the size of the circuit side water passage 13c and the positions of the circuit side inlet 13a and the circuit side outlet 13b are not limited to the above. Further, the circuit side water passage 13c may not be provided with the partition portion 13d. Further, the shape of the circuit side water passage 13c is not particularly limited.

As described above, the present disclosure employs a configuration in which the wiring board 12a and the circuit element 12b of the circuit unit 12 are cooled by the cooling water flowing through the circuit-side cooling unit 13. Therefore, it is preferable to use a metal (for example, Al) having a higher thermal conductivity than resin or the like for the circuit case and the water channel wall portion 131 because the cooling performance of the wiring board 12a and the circuit element 12b can be improved.

As shown in FIGS. 2 and 8, the condenser unit 14 includes a condenser 141, a condenser inlet 14a, a condenser outlet 14b, a condenser water passage 14c, a first connecting portion 14d, a second connecting portion 14e, and the like. There is. In the present embodiment, as an example, the first connecting portion 14d and the second connecting portion 14e are regarded as part of the capacitor portion 14. However, the present disclosure is not limited to this. That is, the first connecting portion 14d and the second connecting portion 14e may not be included in the capacitor portion 14.

The capacitor 141 is electrically connected to, for example, the inverter circuit of the power module unit 11 via the bus bar 142, and functions as a smoothing capacitor. That is, the capacitor 141 is provided in parallel with the inverter circuit between the battery mounted on the vehicle and the inverter circuit. The capacitor 141 is housed in a recess provided in the housing 40, for example. Further, the capacitor 141 may be arranged in the housing 40 while being arranged in a concave capacitor case. The capacitor case can be made of the same material as the circuit case for the same reason as the circuit case.

The condenser inlet 14a, the condenser outlet 14b, the condenser water passage 14c, the first connecting portion 14d, and the second connecting portion 14e are water passages through which cooling water flows. The condenser inflow port 14a, the condenser outflow port 14b, and the condenser water passage 14c are a cooling unit for cooling the condenser 141. The condenser water channel 14c is provided in a region facing the bottom of the condenser 141. The condenser water passage 14c is provided adjacent to the circuit-side water passage 13c via a part of the housing 40. The condenser inlet port 14a, the condenser outlet port 14b, and the condenser water passage 14c may be formed in a box-shaped member made of the same metal as the water passage wall portion 131 as a main component.

The condenser inlet port 14a is an opening for allowing cooling water to flow into the condenser water passage 14c. The condenser inlet port 14a communicates with the inlet port 31 provided in the housing 40 via the first connecting portion 14d. Therefore, the cooling water supplied from the inflow port 31 flows through the first connecting portion 14d and the condenser inflow port 14a and flows into the condenser water passage 14c. In the condenser water passage 14c, for example, as shown by the arrow in FIG. 8, the cooling water flowing from the condenser inlet port 14a flows to the condenser outlet port 14b side. In FIG. 8, the reference numeral 31 is given to the position where the inflow port 31 is provided.

On the other hand, the condenser outlet 14b is an opening for letting out the cooling water flowing through the condenser water passage 14c. The condenser outlet 14b communicates with the circuit side inlet 13a via the second connecting portion 14e. Therefore, the cooling water flowing through the condenser water passage 14c flows through the condenser outlet 14b, the second connecting portion 14e, and the circuit side inlet 13a into the circuit side water passage 13c.

The condenser inflow port 14a and the condenser outflow port 14b are provided on the side of the motor unit 20 like the circuit side inflow port 13a and the circuit side outflow port 13b. Therefore, the condenser water passage 14c is configured such that cooling water flows in from the bottom to the top and flows out from the top to the bottom.

The condenser inlet port 14a, the condenser outlet port 14b, the condenser water passage 14c, the first connecting portion 14d, and the second connecting portion 14e cool the condenser 141 which is a circuit component. Therefore, these can be regarded as a part of the circuit side cooling unit 13. The present disclosure may not include the capacitor unit 14. In this case, the cooling water flows into the circuit side water passage 13c without passing through the condenser water passage 14c or the like.

The power conversion unit 10 is housed in the first housing 41. Therefore, it can be said that the housing 40 is provided with the circuit-side cooling unit 13. More specifically, in the power conversion unit 10, the power module unit 11, which is a structure in which the circuit case housing the wiring board 12a and the circuit element 12b and the circuit-side cooling unit 13 are stacked and arranged, is the recess of the first housing 41. And is fixed to the first housing 41 by a fixing member such as a screw. Further, in the power conversion unit 10, the capacitor unit 14 is arranged in the recess of the first housing 41 and is fixed to the first housing 41 by a fixing member such as a screw.

Further, the power conversion unit 10 is configured such that the condenser inlet 14a and the first connecting portion 14d, the condenser outlet 14b and the circuit side inlet 13a and the second connecting portion 14e, and the circuit side outlet 13b and the motor water passage 21 face each other. It is fixed to the first housing 41. As a result, in the electric drive module 100, a water passage is formed in which cooling water flows from the inflow port 31 to the motor water passage 21 through the condenser water passage 14c and the circuit-side water passage 13c.

Further, the first housing part 41 accommodates the power converter 10 having the circuit side cooling part 13 and the condenser water passage 14c. Therefore, the first housing portion 41 is cooled by the cooling water as the cooling water flows through the circuit-side cooling portion 13 and the condenser water passage 14c.

As described above, the electric drive module 100 includes the condenser water passage 14c that communicates with the circuit-side water passage 13c. Therefore, in addition to the circuit portion 12, the condenser 141 can be integrally cooled. That is, the electric drive module 100 can cool the circuit unit 12 and the condenser 141 by a series of water channels through which cooling water flows.

<About the motor part>
As shown in FIG. 6, the motor unit 20 has a motor water channel 21, an outlet water channel 22, motor constituent elements 23 to 25, and the like. Further, the motor section 20 has the motor water channel 21, the outlet water channel 22 provided in the second housing section 42 as described above, and the motor constituent elements 23 to 25 housed in the second housing section 42. Can be said.

The motor shaft (rotating shaft) 23 is arranged such that a part of the one end side is arranged in the motor arrangement portion 45, and the other parts are arranged outside the motor arrangement portion 45. The motor shaft 23 has one end arranged in the motor arrangement portion 45 rotatably fixed to a bearing provided in a space surrounded by the second housing portion 42 and the first cover 43. As a result, the motor shaft 23 is configured to be rotatable with respect to the stator 25 and the second housing portion 42.

The rotor 24 has a permanent magnet and the like, and is fixed to the motor shaft 23 so as not to rotate. That is, the rotor 24 is fixed to the motor shaft 23 so as to face each other in the radial direction orthogonal to the extension direction of the motor shaft 23. Therefore, the motor shaft 23 and the rotor 24 rotate together.

In the rotor 24, for example, a plurality of permanent magnets are provided around the axis of the motor shaft 23 at equal intervals. For example, the number of magnetic poles of the rotor 24 may be eight. The rotor 24 has a columnar outer shape with the motor shaft 23 as the central axis. The motor shaft 23 and the rotor 24 are integrated and arranged in the stator 25. In addition, in FIG. 6, the permanent magnet is illustrated in a simplified manner.

The stator 25 has a stator core and a stator coil provided on the stator core. The stator core has a cylindrical shape. The integrated motor shaft 23 and rotor 24 are rotatably arranged in the stator core of the stator 25. Therefore, the stator 25 faces the rotor 24 in the radial direction orthogonal to the extension direction of the motor shaft 23.

The stator coil has a U-phase stator coil, a V-phase stator coil, and a W-phase stator coil. Each of these three-phase stator coils has an insulated electric wire whose conductor is covered with an insulating coating. In the stator 25, these three-phase insulated wires are wound around the stator core. In this way, the stator coil is provided on the stator core.

In the stator 25, the stator coil and the power module unit 11 are electrically connected via the terminal block 50 as described above. Three-phase alternating current is supplied to the stator coil from the power module unit 11. As a result, in the motor unit 20, a three-phase rotating magnetic field is generated from the stator coil.

As described above, the rotor 24 has a permanent magnet, and the magnetic field is generated from the permanent magnet. Then, a three-phase rotating magnetic field is generated from the stator coil. Rotational torque is generated in the rotor 24 by the interaction of these two magnetic fields. The generation direction of the rotating torque sequentially changes with time in the circumferential direction around the extension direction of the motor shaft 23 according to the phase change of the rotating magnetic field. Therefore, the direction of generation of the rotational torque acting on the rotor 24 sequentially changes with time. As a result, the motor shaft 23 to which the rotor 24 is fixed rotates.

As described above, in the electric drive module 100, the circuit section 12 and the motor components 23 to 25 are integrally formed in the housing 40. Further, in the electric drive module 100, the circuit side cooling unit 13 and the motor water passage 21 are provided in the housing 40. The structure in which the circuit portion 12 and the motor components 23 to 25 are integrally formed in the housing 40 can be said to be an electromechanical integrated structure. Therefore, it can be said that the electric drive module 100 includes the electromechanical integrated structure.

<Regarding gear device>
Further, as shown in FIG. 1, the electric drive module 100 includes a mechanical-electrical integrated structure and a gear device 200 that are integrally formed. The gear device 200 has a speed reduction unit 210, a differential unit 220, a drive shaft 300, and the like.

The speed reducer 210 includes a speed reducer component and a housing that houses the component. Examples of constituent elements of the speed reducer include an input shaft, a counter shaft, an input gear, a counter gear, and a drive gear. The differential unit 220 includes a differential gear that constitutes a differential device, a housing that houses the differential gear, and the like. Further, in the differential portion 220, the output shaft of the speed reducer is connected to the differential gear.

The housing of the speed reducing portion 210 and the housing of the differential portion 220 may be separately configured and joined together with a fixing member such as a screw, or may be configured as an integral body. The differential section 220 corresponds to a differential section.

The drive shaft 300 is attached to a differential gear. That is, the drive shaft 300 is provided on both sides so as to sandwich the differential gear. Traveling wheels are attached to both ends of the drive shaft 300.

The speed reducer 210 is connected to an end of the housing 40 of the electromechanical integrated structure. Reference numeral S1 in FIG. 1 is a surface of the housing 40 that faces the speed reduction unit 210. On the other hand, reference numeral S2 is a surface of the deceleration portion 210 that faces the housing 40. The speed reduction unit 210 and the housing 40 are fixed by a fixing member such as a screw in a state where the first surface S1 and the second surface S2 face each other. The end of the motor shaft 23 is inserted into the reduction gear 210 with the reduction gear 210 and the housing 40 fixed. Then, the motor shaft 23 is spline-fitted to the input shaft in the speed reducer 210. Further, when the speed reduction unit 210 and the housing 40 are fixed, the drive shaft 300 and the motor shaft 23 are arranged in parallel.

The first surface S1 and the second surface S2 may be in partial contact or may be in total contact. When the first surface S1 and the second surface S2 are in partial contact, vibrations generated in the power conversion unit 10, the motor unit 20, and the like are less likely to be transmitted to the gear device 200 than they are in total contact. Therefore, when the first surface S1 and the second surface S2 are partially in contact with each other, it is possible to suppress generation of noise (abnormal noise) due to vibration, rather than being in contact with the entire surface.

Further, as described above, the first housing portion 41 and the second housing portion 42 are cooled by the cooling water as the cooling water flows. Therefore, when the first surface S1 and the second surface S2 are entirely in contact with each other, it is easier to cool the gear device 200 by the first housing portion 41 and the second housing portion 42 than when they are partially in contact with each other. ..

Further, as shown in FIG. 1, the gear device 200 is arranged such that the differential portion 220 is adjacent to the housing 40 in a state in which the speed reduction portion 210 is fixed to the housing 40. The differential portion 220 and the housing 40 are arranged adjacent to each other in the Z direction. In the gear device 200, the housing of the differential portion 220 may partially contact the housing 40.

<Regarding the relationship between the inlet and outlet and the gear device>
Further, as shown in FIG. 1, the inflow port 31 and the outflow port 32 are provided at positions facing the gear device 200. In the present embodiment, an example is adopted in which the inflow port 31 and the outflow port 32 are provided at positions facing the gear device 200 in the stacking direction. Therefore, at least a part of the inflow port 31 and the outflow port 32 is arranged in the projection area of the gear device 200.

As a result, the electric drive module 100 can be made smaller than the case where the inflow port 31 and the outflow port 32 are provided at positions not facing the gear device 200. That is, when the inflow port 31 and the outflow port 32 are not arranged to face the gear device 200, the electric drive module 100 has a larger size because the inflow port 31 and the outflow port 32 are provided so as to project from the housing 40. ..

However, in the electric drive module 100, even if the inflow port 31 and the outflow port 32 are provided so as to project from the housing 40, the inflow port 31 and the outflow port 32 are arranged to face the gear device 200. Therefore, the electric drive module 100 can suppress the increase in size due to the protrusion of the inflow port 31 and the outflow port 32. Further, in FIG. 1, the electric drive module 100 can have a smaller physical size in the Z direction than the configuration in which the inflow port 31 and the outflow port 32 are provided so as to project in the Z direction with respect to the housing 40. The present disclosure can reduce the physical size in the Z direction even if a part of the motor water passage 21 is not arranged between the motor constituent elements 23 to 25 and the circuit-side water passage 13c.

The preferred embodiment of the present disclosure has been described above. However, the present disclosure is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present disclosure. Below, 2nd Embodiment is described as other forms of this indication. The above-described embodiment and the second embodiment can be carried out individually, but can also be carried out in an appropriate combination. The present disclosure is not limited to the combinations shown in the embodiments and can be implemented by various combinations.

(Second embodiment)
The electric drive module 101 according to the second embodiment will be described with reference to FIG. 10. Here, the difference between the electric drive module 101 and the electric drive module 100 will be mainly described. The position of the terminal block 50 of the electric drive module 101 is different from that of the electric drive module 100. The other points are similar to those of the electric drive module 100. Further, in this embodiment, the same reference numerals as those in the above embodiment are used.

The structure of the terminal block 50 is similar to that of the above-described embodiment. Then, as shown in FIG. 10, in the electric drive module 101, a part of the circuit side terminal 52 and the motor side terminal 53 are arranged to face the motor water channel 21. In the present embodiment, as an example, the terminal block 50 in which a part of the motor-side terminal 53 is arranged so as to face the motor water channel 21 is adopted. The motor side terminal 53 and the motor water channel 21 are arranged opposite to each other with the housing 40 arranged therebetween. The housing 40 is mainly composed of a metal such as Al as described above.

As a result, the electric drive module 101 can cool not only the circuit section 12 and the motor components 23 to 25 but also the motor side terminal 53. Further, the motor side terminal 53 is connected to the circuit side terminal 52. Therefore, the electric drive module 101 can also cool the motor-side terminal 53 via the motor-side terminal 53.

The motor-side terminal 53 may be in contact with the housing 40 via a sheet having electrical insulation. Thereby, the electric drive module 100 can further improve the cooling performance of the terminals 52 and 53.

However, the present disclosure is not limited to this, and the terminals 52 and 53 of the terminal block 50 may not be arranged to face the motor water passage 21.

DESCRIPTION OF SYMBOLS 10... Electric power conversion part, 11... Power module part, 12... Circuit part, 12a... Wiring board, 12b... Circuit element, 13... Circuit side cooling part, 13a... Circuit side inlet, 13b... Circuit side outlet, 13c... Circuit side water passage, 13d... Partition portion, 131... Water passage wall portion, 14... Condenser portion, 141... Condenser, 142... Bus bar, 14a... Condenser inlet port, 14b... Condenser outlet port, 14c... Condenser water channel, 14d... First connection Part, 14e... 2nd connection part, 20... Motor part, 21... Motor water channel, 22... Exit water channel, 23... Motor shaft, 24... Rotor, 25... Stator, 31... Inflow port, 32... Outflow port, 40... Housing , 41... First housing part, 42... Second housing part, 43... First cover, 44... Second cover, 45... Motor placement part, 50... Terminal block, 51... Electrical insulating part, 52... Circuit side terminal, 53... Motor side terminal, 100, 101... Electric drive module, 200... Gear device, 210... Reduction part, 220... Differential part, 300... Drive shaft, 400... Heat exchanger, 500... Water pump, S1... First surface , S2... Second surface

Claims (5)

Motors (23-25),
A power conversion circuit (12) for driving the motor,
A cooling water channel (13, 21) through which a refrigerant for cooling the motor and the power conversion circuit flows;
A housing (40) in which the motor and the power conversion circuit are integrally housed and in which the cooling water passage is provided;
An inlet port (31) for the refrigerant to the cooling water channel, which is provided so as to project from the housing;
An outlet (32) for the refrigerant from the cooling water channel provided so as to project from the housing;
The housing includes a speed reducer (210) including a speed reducer connected to a rotation shaft (23) of the motor, and a differential unit (220) including a differential device connected to an output shaft of the speed reducer. And a gear device (200) fixed to
An electric drive module in which the inflow port and the outflow port are provided at positions facing the gear device. The power conversion circuit is stacked on the motor in a direction orthogonal to the rotation axis,
The cooling water passage is connected to a motor-side cooling unit (21) that cools the motor, and a circuit-side cooling unit that communicates with the motor-side cooling unit and that is arranged upstream of the motor-side cooling unit and that cools the power conversion circuit. An electric drive module according to claim 1, including a part (13). The electric drive module according to claim 2, wherein the outlet is arranged above the inlet in the stacking direction of the power conversion circuit and the motor. The electric drive module according to any one of claims 1 to 3, wherein the inflow port and the outflow port are provided adjacent to each other. The electric drive module according to claim 1, wherein the inflow port and the outflow port are provided on the same wall surface of the housing.

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