Drive device

Abstract

The invention relates to a driving device. The drive device includes a housing, a motor, a gear unit, an electric unit, a first path, a second path, and a heat exchanger. The housing includes a motor chamber, a gear chamber, and an electrical unit chamber. At least a portion of the electrical unit chamber is located on one side of the gear chamber in the axial direction. And one end of one axial side of the motor shaft is positioned in the gear chamber. At least a portion of the heat exchanger overlaps the gear chamber in the axial direction and overlaps the electrical unit chamber in a radial direction perpendicular to the axial direction.

Description

Technical Field

[0001] The present disclosure relates to a drive device. Background Art

[0002] There is a known integrated drive device having a motor chamber, a gear chamber, and an electric unit chamber. In addition, there is a known technology for mounting an oil cooler on an integrated drive device. In addition, Japanese Patent Application Laid-Open No. 2020-68637 discloses a related technology.

[0003] In an integrated drive device, it is required to reduce the size of the drive device. However, depending on the method of mounting an oil cooler on the drive device, the size of the drive device may increase due to the oil cooler. Summary of the invention

[0004] A driving device of a first aspect of the present disclosure includes a housing, a motor, a gear unit, an electric unit, a first path, a second path, and a heat exchanger. The housing includes a motor chamber, a gear chamber, and an electric unit chamber. At least a portion of the electric unit chamber is located at a position closer to one side of the gear chamber in the axial direction. The motor is accommodated in the motor chamber and includes a motor shaft. One end of the motor shaft on one side in the axial direction is located in the gear chamber. The gear unit is accommodated in the gear chamber and is mechanically connected to the one end of the motor shaft. The electric unit is accommodated in the electric unit chamber and is electrically connected to the motor. The first path is configured to supply a first heat medium configured to cool the motor to the motor. The second path is configured to supply a second heat medium configured to cool the electric unit to the electric unit. The heat exchanger is arranged on the first path and the second path. The heat exchanger is configured to perform heat exchange between the first heat medium and the second heat medium. At least a portion of the heat exchanger overlaps with the gear chamber in the axial direction and overlaps with the electric unit chamber in a radial direction perpendicular to the axial direction.

[0005] In the above structure, at least a portion of the heat exchanger overlaps with the gear chamber in the axial direction of the motor shaft. This can prevent the axial width of the drive device from increasing due to the heat exchanger. In addition, in the above structure, at least a portion of the heat exchanger overlaps with the electric unit chamber in the radial direction perpendicular to the axial direction. This can prevent the radial width of the drive device from increasing due to the heat exchanger. This can achieve miniaturization of the drive device.

[0006] In the driving device according to the first aspect of the present disclosure, at least a portion of the electric unit chamber may be located on one side in the axial direction relative to the heat exchanger.

[0007] According to the above configuration, it is possible to suppress the axial width of the drive device from increasing due to the heat exchanger.

[0008] In the drive device according to the first aspect of the present disclosure, at least a portion of the electric unit chamber may overlap with the gear chamber in the radial direction.

[0009] According to the above configuration, the amount of protrusion of the electric unit chamber to one side in the axial direction can be reduced, and the volume of the drive device can be reduced.

[0010] In the drive device according to the first aspect of the present disclosure, at least a portion of the electric unit chamber may overlap with the motor chamber in the axial direction.

[0011] According to the above configuration, the amount of protrusion of the electric unit chamber in the radial direction perpendicular to the axial direction can be reduced, and the volume of the drive device can be reduced.

[0012] In the drive device according to the first aspect of the present disclosure, at least a portion of the heat exchanger and at least a portion of the first path may be located on one side in the axial direction with respect to the gear chamber.

[0013] In the driving device according to the first aspect of the present disclosure, at least a portion of the first path may be formed of a pipe member.

[0014] In the driving device according to the first aspect of the present disclosure, the first path may extend from the outside of the casing into the electric unit room through a wall surface of the casing that defines the electric unit room.

[0015] According to the above configuration, it is possible to form a first path that reaches the one end of the motor shaft via the wall surface of the gear chamber and the interior of the electric unit chamber.

[0016] In the driving device of the first mode of the present disclosure, a part of the electric unit chamber may be located on an extension line of the motor shaft to one side of the axial direction. The one end of the motor shaft may be supported on a partition wall between the gear chamber and the electric unit chamber. A flow path may be provided at the axis of the motor shaft. The first path may be configured to pass through the electric unit chamber and the partition wall. The first path may be configured to be connected to the flow path at the one end.

[0017] According to the above configuration, the heat medium can be supplied from one end of the motor shaft.

[0018] In the driving device of the first aspect of the present disclosure, the driving device may further include a pump configured to deliver the first heat medium stored in the gear chamber to the first path. The pump may be located on one side of the axial direction or the other side of the axial direction relative to the gear chamber. The heat exchanger may be arranged in a section of the first path that connects the pump to the one end of the motor shaft.

[0019] In the drive device of the first aspect of the present disclosure, the motor chamber and the gear chamber may be connected via a communication hole configured to allow the first heat medium to flow. The electric unit chamber may be separated from the motor chamber and the gear chamber in a liquid-tight manner.

[0020] In the drive device of the first aspect of the present disclosure, the housing may include: a motor housing having the motor chamber; a gear box configured to define at least a portion of the gear chamber; and an electric unit housing configured to define at least a portion of the electric unit chamber. The gear box and the electric unit housing may be fastened to the motor housing by a plurality of fastening members.

[0021] According to the above structure, the gear box and the electric unit case can be assembled independently of each other, and the ease of assembly of the drive device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like parts, and in which:

[0023] Figure 1 It is a cross-sectional view showing a schematic structure of a driving device.

[0024] Figure 2 It is a perspective view of the drive device.

[0025] Figure 3 It is a cross-sectional view showing a schematic structure of a driving device.

[0026] Figure 4 It is a cross-sectional view showing a schematic structure of a driving device.

[0027] Figure 5 It is a cross-sectional view showing a schematic structure of a driving device. DETAILED DESCRIPTION

[0028] [Example 1]

[0029] (Structure of driving device 1)

[0030] Figure 1: is a cross-sectional view showing the schematic structure of the drive device 1 of the present embodiment. The drive device 1 is an integrated device that houses a motor, a gear unit, and a power conversion unit for controlling the motor in the same housing. The directions FR, RH, and UP indicate the orientation of the drive device 1 relative to the vehicle when the drive device 1 is mounted on the vehicle (electric vehicle). The direction FR indicates the front in the front-to-back direction of the vehicle. The direction RH indicates the right in the left-right direction (or width direction) of the vehicle. The direction UP indicates the top in the up-down direction of the vehicle. The same is true in the other drawings. In addition, Figure 1 In FIG. 1 , the plurality of shafts (the motor shaft 43 , the auxiliary shaft 52 , and the drive shafts 57L and 57R) are displayed in a developed manner so as to be located in the same plane.

[0031] The driving device 1 is controlled by a control device 2. The control device 2 includes a CPU, a RAM, a ROM, an input / output interface, etc. The control device 2 is connected to a power conversion unit 21 and the like via a signal line (not shown).

[0032] The driving device 1 includes a housing 10. The housing 10 includes a first housing 11, a motor housing 13, and a cover 15. The first housing 11 and the motor housing 13 may be cast parts.

[0033] The first housing 11 includes a first flange 11f extending along the outer periphery of the first housing 11. The motor housing 13 includes a motor housing flange 13f extending along the outer periphery of the motor housing 13. The first housing 11 is fastened to the motor housing 13 by a plurality of bolts 60. In addition, the first housing 11 includes an opening AP. The cover 15 is fastened to the first housing 11 by a plurality of bolts 60 in a manner that closes the opening AP.

[0034] The motor housing 13 includes a motor chamber 31. The motor chamber 31 contains the motor 40. In other words, the motor housing 13 contains the motor 40. The motor 40 includes a stator 41, a rotor 42, and a motor shaft 43. The stator 41 has a cylindrical shape. The rotor 42 is rotatably arranged inside the stator 41. The motor shaft 43 includes a central axis CA.

[0035] The motor housing 13 has a facing surface 13s facing the first housing 11. The facing surface 13s is formed with a motor shaft hole MH and a drive shaft hole DH1. The motor shaft hole MH passes through the motor shaft hole MH. The left drive shaft 57L passes through the drive shaft hole DH1.

[0036] The first housing 11 has a box shape with one side open. The first housing 11 is fastened to the facing surface 13s so that the opening side is blocked by the facing surface 13s. Thus, a gear chamber SP1 is defined between the motor housing 13 and the first housing 11. The gear unit 50 is accommodated in the gear chamber SP1. In other words, the first housing 11 accommodates the gear unit 50.

[0037] The gear unit 50 includes a shaft gear 51, a countershaft 52, a first counter gear 53, a second counter gear 54, a ring gear 55, and a differential gear 56. The shaft gear 51 is mounted on the motor shaft 43. Thus, the gear unit 50 is mechanically connected to the motor 40. The first counter gear 53 and the second counter gear 54 are mounted on the countershaft 52. The first counter gear 53 meshes with the shaft gear 51. The second counter gear 54 meshes with the ring gear 55. The ring gear 55 is mounted on the differential gear 56. A pair of drive shafts 57L and 57R extend from the differential gear 56 in the vehicle width direction. The drive shaft 57R penetrates the drive shaft hole DH2 formed in the first housing 11. A storage portion 58 is provided at the lower portion of the gear chamber SP1. Oil 61 is stored in the storage portion 58. A portion of the gear unit 50 is immersed in the oil 61 stored in the storage portion 58.

[0038] Figure 2 2 is a perspective view showing the driving device 1. Figure 2 FIG. 4 shows a state where the cover 15 and the power conversion unit 21 are removed. In addition, the position of one end 43e of the motor shaft 43 is indicated by a dotted line. Figure 1 as well as Figure 2 As shown, an electric unit chamber SP2 having an opening AP is provided in the first housing 11. The opening AP can be sealed by fastening the cover 15 with bolts 60. That is, the electric unit chamber SP2 is liquid-tightly isolated from the motor chamber 31 and the gear chamber SP1. The electric unit chamber SP2 accommodates a power conversion unit 21. The power conversion unit 21 is a part for controlling the power supplied to the motor 40 and the power generated. As an example of the components included in the power conversion unit 21, an inverter, a converter, etc. can be cited.

[0039] In the axial direction of the central axis CA of the motor shaft 43, the side where the shaft gear 51 is arranged is defined as one axial side AD1. The side opposite to the one axial side AD1 is defined as the other axial side AD2. The direction perpendicular to the central axis CA is defined as a radial direction RD.

[0040] (Structure of oil cooling system and water cooling system)

[0041] The drive device 1 includes an oil cooling system and a water cooling system. First, the oil cooling system is described. The oil cooling system includes a coarse filter 71, an oil pump 72, an oil cooler 73, an oil path 74, and an axial flow path 75. That is, the oil in this embodiment is an example of the first heat medium, and the water is an example of the second heat medium.

[0042] The axial flow path 75 is a flow path formed on the axis of the hollow (cylindrical) motor shaft 43. In addition, the motor shaft 43 has one end 43e on one axial side AD1. The one end 43e is located in the gear chamber SP1. An inlet toward the axial flow path 75 is formed at the one end 43e. The one end 43e is supported by a bearing 59. The bearing 59 is fixed to the partition wall 11b between the gear chamber SP1 and the electric unit chamber SP2.

[0043] The oil path 74 is a path for supplying oil to the motor 40. The structure of the oil path 74 can be various. For example, it can be a pipe member or a channel formed on the wall. In this embodiment, at least a part of the oil path 74 is composed of a pipe member.

[0044] The oil passage 74 connects the discharge port of the oil pump 72 to the inlet port of the oil cooler 73, and connects the discharge port of the oil cooler 73 to the one end 43e of the motor shaft 43. In other words, the oil cooler 73 is arranged in the section of the oil passage 74 connecting the oil pump 72 to the one end 43e of the motor shaft 43. The oil stored in the gear chamber SP1 can be supplied to the axial flow passage 75 of the motor shaft 43 through the oil passage 74.

[0045] The strainer 71 is disposed in the reservoir 58. The strainer 71 is connected to a suction port of an oil pump 72. The oil pump 72 is located on the other axial side AD2 relative to the gear chamber SP1. The oil pump 72 sucks the oil 61 in the reservoir 58 through the strainer 71. The oil pump 72 delivers the sucked oil to the oil cooler 73 through the oil passage 74.

[0046] The oil cooler 73 is an example of a heat exchanger that cools the oil by exchanging heat with cooling water. The oil cooler 73 is located on one axial side AD1 relative to the gear chamber SP1. That is, the oil cooler 73 and the oil pump 72 face each other across the gear chamber SP1. The oil cooler 73 overlaps with the gear chamber SP1 in the axial direction of the center axis CA. In addition, the oil cooler 73 overlaps with the electric unit chamber SP2 in the radial direction RD. An oil path 74 and a water path 83 are arranged facing each other in the oil cooler 73. In other words, the oil cooler 73 is provided on the oil path 74 and the water path 83. In the present embodiment, the oil path 74 is an example of a first path. The water path 83 is an example of a second path.

[0047] The discharge port of the oil cooler 73 is connected to the one end 43e of the motor shaft 43 through the oil passage 74. The oil passage 74 connecting the oil cooler 73 and the one end 43e is located on the axial side AD1 relative to the gear chamber SP1. Specifically, a portion of the electric unit chamber SP2 is located on the extension line of the motor shaft 43 to the axial side AD1 (see area A1). The oil passage 74 extends from the outside of the housing 10 into the electric unit chamber SP2 through the wall surface 11w that defines the electric unit chamber SP2 (see area A2). In addition, the oil passage 74 passes through the electric unit chamber SP2 and penetrates the partition wall 11b (see area A3). The end of the oil passage 74 is connected to the axial flow passage 75 at the one end 43e of the motor shaft 43.

[0048] The axial flow path 75 is provided with a plurality of discharge holes (not shown) penetrating in the radial direction. The oil flows in the axial flow path 75 toward the other axial side AD2. The oil flows out from the discharge holes and the end of the axial flow path 75 at the other axial side AD2, and is supplied to the rotor 42, the stator 41, etc. The oil supplied to the motor 40 through the axial flow path 75 flows downward in the motor chamber 31. The flowing oil returns to the storage portion 58 in the gear chamber SP1 through the communication hole 16 provided in the partition wall between the motor chamber 31 and the gear chamber SP1.

[0049] Next, the water cooling system is described. The water cooling system includes a water pump 81, a radiator 82, and a water path 83. The water path 83 is a path for supplying cooling water to the power conversion unit 21. The water path 83 is a path for circulating from the water pump 81 to the water pump 81 via the radiator 82, the power conversion unit 21, and the oil cooler 73. The cooling water circulating in the water path 83 can cool the power conversion unit 21 and cool the oil in the oil cooler 73.

[0050] (Effect)

[0051] In the drive device 1 of the present embodiment, the oil cooler 73 is overlapped with the gear chamber SP1 in the axial direction of the center axis CA. Thus, when viewed from the axial direction of the center axis CA, the oil cooler 73 can be located within the range of the gear chamber SP1. Therefore, at least a portion of the oil cooler 73 does not protrude from the housing 10 in the radial direction RD. Thus, the width of the drive device 1 in the radial direction RD can be suppressed from increasing due to the oil cooler 73. The volume of the drive device 1 can be miniaturized.

[0052] In the drive device 1 of the present embodiment, the oil cooler 73 is overlapped with the electric unit chamber SP2 in the radial direction RD. In addition, a portion of the electric unit chamber SP2 is located at a distance DIS from the oil cooler 73 on the axial side AD1. Thus, when viewed from the radial direction RD, the oil cooler 73 can be located within the range of the electric unit chamber SP2. In other words, the oil cooler 73 can be accommodated within the range where the electric unit chamber SP2 protrudes. Therefore, at least a portion of the oil cooler 73 does not protrude from the housing 10 to the axial side AD1. Thus, the axial width of the center axis CA of the drive device 1 can be suppressed from increasing due to the oil cooler 73. The volume of the drive device 1 can be miniaturized.

[0053] The longer the distance from the discharge port of the oil cooler 73 to the inlet port (one end 43e) of the axial flow path 75, the greater the piping resistance of the oil path 74. Therefore, in the technology of this embodiment, both the oil cooler 73 and the one end 43e are arranged on the one axial side AD1 relative to the gear chamber SP1. As a result, the distance from the discharge port of the oil cooler 73 to the one end 43e can be shortened compared to the case where the oil cooler 73 is arranged on the other axial side AD2 relative to the gear chamber SP1. Since the piping resistance of the oil path 74 can be reduced, the oil flow rate can be increased while maintaining the capacity of the oil pump 72, and the oil pump 72 can be miniaturized while maintaining the oil flow rate.

[0054] like Figure 1 As shown, in the area on the opposite side of the gear unit 50 relative to the motor shaft 43, a space is formed by the size difference between the motor 40 and the gear unit 50. A part of the electric unit chamber SP2 is arranged in this space. That is, in the radial direction RD perpendicular to the central axis CA, at least a part of the electric unit chamber SP2 overlaps with the gear chamber SP1. Thus, the space around the motor shaft 43 can be effectively utilized. Therefore, the protrusion amount of the electric unit chamber SP2 on the axial side AD1 can be reduced. The volume of the drive device 1 can be miniaturized.

[0055] In addition, in the axial direction of the central axis CA, at least a portion of the electric unit chamber SP2 overlaps with the motor chamber 31. This also allows effective use of the space around the motor shaft 43. Therefore, the protrusion amount of the electric unit chamber SP2 in the radial direction RD can be reduced.

[0056] [Example 2]

[0057] The arrangement of the oil pump 72 of the second embodiment is different from that of the first embodiment. The same reference numerals are used to indicate the common parts in the first and second embodiments, and the description thereof will be omitted.

[0058] Figure 3 A schematic structure of a driving device 201 according to the second embodiment is shown. Figure 3 is with Figure 1 Same cross-sectional view. The oil pump 72 is located on one axial side AD1 relative to the gear chamber SP1. That is, both the oil pump 72 and the oil cooler 73 are arranged on the same direction side relative to the gear chamber SP1. The oil pump 72 and the oil cooler 73 overlap with the gear chamber SP1 in the axial direction of the central axis CA. In addition, the oil pump 72 and the oil cooler 73 overlap with the electric unit chamber SP2 in the radial direction RD. The oil passage 74 connects the discharge port of the oil pump 72 with the inlet port of the oil cooler 73, and connects the discharge port of the oil cooler 73 with one end 43e of the motor shaft 43.

[0059] In the drive device 201 of the second embodiment, at least a portion of the oil cooler 73 does not protrude in the radial direction RD or in the axial direction to the one side AD1 from the housing 10. The volume of the drive device 1 can be suppressed from increasing due to the oil cooler 73.

[0060] [Example 3]

[0061] The routing method of the oil passage 74 of the third embodiment is different from that of the first embodiment. The same reference numerals are given to the common parts in the first and third embodiments, and the description thereof will be omitted. Figure 4 A schematic structure of a driving device 301 according to a third embodiment is shown. Figure 4 is with Figure 1 Same cross-section view.

[0062] In the drive device 301 of Example 3, the motor shaft 43 has the other end 43e2 on the other axial side AD2. An inlet toward the axial flow path 75 is formed at the other end 43e2. The oil pump 72 is located on the one axial side AD1 relative to the gear chamber SP1. That is, both the oil pump 72 and the oil cooler 73 are arranged on the same direction side relative to the gear chamber SP1. The oil pump 72 and the oil cooler 73 overlap with the gear chamber SP1 in the axial direction of the center axis CA. In addition, the oil pump 72 and the oil cooler 73 overlap with the electric unit chamber SP2 in the radial direction RD. The oil path 74 connects the discharge port of the oil pump 72 with the inlet port of the oil cooler 73, and connects the discharge port of the oil cooler 73 with the other end 43e2 of the motor shaft 43. The oil flows toward the one axial side AD1 in the axial flow path 75.

[0063] In the drive device 301 of the third embodiment, it is also possible to suppress an increase in the volume of the drive device 301 due to the oil cooler 73 .

[0064] [Example 4]

[0065] The form of the housing of the fourth embodiment is different from that of the first embodiment. The same reference numerals are given to the common parts in the first embodiment and the fourth embodiment, and the description thereof will be omitted. Figure 5 A schematic structure of a driving device 401 according to a fourth embodiment is shown. Figure 5 is with Figure 1 The same cross-sectional view. In addition, Figure 5 In the figure, the elements unique to Example 4 are marked with figure numbers in the 400 segment to distinguish them.

[0066] The housing 410 includes a first housing 411, a second housing 412, and a motor housing 13. The first housing 411 is fastened to the facing surface 13s of the motor housing 13 by a plurality of bolts 60. A gear chamber SP1 is defined between the motor housing 13 and the first housing 411.

[0067] The second housing 412 has a box shape with one side open. The second housing 412 is fastened to the facing surface 13s and the upper surface 411u of the first housing 411 by a plurality of bolts 60. Thus, the electric unit chamber SP2 is defined between the motor housing 13 and the first housing 411 and the second housing 412. Therefore, by assembling the second housing 412 on the first housing 411, a part of the electric unit chamber SP2 can be located on the extension line of the motor shaft 43 to the axial side AD1 (see area A1).

[0068] (Effect)

[0069] By separately configuring the first housing 411 for housing the gear unit 50 and the second housing 412 for housing the power conversion unit 21, the power conversion unit 21 can be installed with only the second housing 412 removed from the motor housing 13. As a result, when installing the power conversion unit 21, there is no interference from the second housing 412. Therefore, the approach direction of the tool to the contact portion between the power conversion unit 21 and the facing surface 13s can be expanded (see the dotted arrow Y1). The assembly efficiency of the power conversion unit 21 can be improved.

[0070] The above detailed description of the implementation methods is provided, but these are only examples and do not limit the claims. The technology described in the claims includes various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings exert technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the technology illustrated in this specification or the drawings achieves multiple purposes at the same time, and achieving one of the purposes itself has technical usefulness.

[0071] (Variation)

[0072] The vehicle equipped with the drive device of this specification is not limited to electric vehicles. The drive device of this specification can be installed in a hybrid vehicle or a plug-in hybrid vehicle, for example. In this case, the drive device of this specification can accommodate multiple motors in the housing, and can also accommodate a planetary gear mechanism. In addition, the drive device of this specification can also be applied to vehicles such as fuel cell vehicles that use electric motors for at least part of their driving.

Claims

1. A driving device, characterized in that: include: a housing including a motor chamber, a gear chamber, and an electric unit chamber, wherein at least a portion of the electric unit chamber is located axially closer to one side than the gear chamber; a motor, the motor being housed in the motor chamber and having a motor shaft, one end of the motor shaft on one axial side being located in the gear chamber; a gear unit, the gear unit being accommodated in the gear chamber and being configured to be mechanically connected to the one end of the motor shaft; an electric unit, the electric unit being housed in the electric unit chamber and being configured to be electrically connected to the motor; a first path configured to supply a first heat medium configured to cool the motor to the motor; a second path configured to supply a second heat medium configured to cool the electric unit to the electric unit; as well as Heat exchangers, The heat exchanger is arranged on the first path and the second path, and the heat exchanger performs heat exchange between the first heat medium and the second heat medium. At least a portion of the heat exchanger overlaps with the gear chamber in the axial direction and overlaps with the electric unit chamber in a radial direction perpendicular to the axial direction.

2. The driving device according to claim 1, characterized in that: At least a portion of the electric unit chamber is located on one side in the axial direction relative to the heat exchanger.

3. The driving device according to claim 2, characterized in that: In the radial direction, at least a portion of the electric unit chamber overlaps with the gear chamber.

4. The driving device according to claim 3, characterized in that: In the axial direction, at least a portion of the electric unit chamber overlaps with the motor chamber.

5. The driving device according to claim 1, characterized in that: At least a portion of the heat exchanger and at least a portion of the first path are located on one side in the axial direction with respect to the gear chamber.

6. The driving device according to claim 5, characterized in that: At least a portion of the first path is formed of a pipe member.

7. The driving device according to claim 5, characterized in that: The first path extends from the outside of the casing into the electric unit room through a wall surface of the casing that defines the electric unit room.

8. The driving device according to claim 7, characterized in that: A portion of the electric unit chamber is located on an extension line of the motor shaft toward one side of the axial direction, the one end of the motor shaft is supported on a partition wall between the gear chamber and the electric unit chamber, a flow path is provided at the axis of the motor shaft, the first path is configured to pass through the electric unit chamber and penetrate the partition wall, and the first path is configured to be connected to the flow path at the one end.

9. The driving device according to claim 8, characterized in that: The driving device also includes a pump configured to deliver the first heat medium stored in the gear chamber to the first path, wherein the pump is located on one axial side or the other axial side relative to the gear chamber, and the heat exchanger is arranged in a section of the first path that connects the pump to the one end of the motor shaft.

10. The driving device according to claim 1, characterized in that: The motor chamber and the gear chamber are connected via a communication hole configured to allow the first heat medium to flow, and the electric unit chamber is separated from the motor chamber and the gear chamber in a liquid-tight manner.

11. The driving device according to claim 1, characterized in that: The housing includes: a motor housing having the motor chamber; a gear box configured to define at least a portion of the gear chamber; and an electric unit housing configured to define at least a portion of the electric unit chamber, and, The gear box and the electric unit housing are fastened to the motor housing by a plurality of fastening members.

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