Drive device

Abstract

The invention relates to a driving device. A drive device for a vehicle includes a housing, a motor, a gear unit, an electric unit, and a heat medium path. The motor shaft is provided with a flow path at the axis. The housing includes a motor chamber, a gear chamber, and an electrical unit chamber. The heat medium path is configured so as to supply a heat medium to the flow path. And one end of one axial side of the motor shaft is positioned in the gear chamber. At least a portion of the electrical unit chamber is positioned closer to one side in the axial direction than the one end of the motor shaft. The heat medium path is connected to the flow path at the one end of the motor shaft.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a drive device. Background Art

[0002] An integrated drive device having a motor chamber, a gear chamber, and an electric unit chamber is known. In addition, a so-called axial cooling technology is known in which a flow path of a heat medium is formed at the axial center of the motor shaft. It should be noted that the related technology is disclosed in Japanese Patent Application Laid-Open No. 2020-174478.

[0003] In an integrated drive device, the size of the drive device is required to be miniaturized. However, in order to adopt shaft center cooling, a heat medium path is required for supplying heat medium to the shaft center of the motor shaft. Depending on the layout of the heat medium path, the size of the drive device may increase due to the heat medium path. Summary of the invention

[0004] A driving device for a vehicle according to a first embodiment of the present disclosure comprises a housing, a motor, a gear unit, an electric unit and a heat medium path. The motor is housed in a motor chamber and comprises a motor shaft. The motor shaft is provided with a flow path at the axis. The housing comprises the motor chamber, the gear chamber and the electric unit chamber. The gear unit is housed in the gear chamber and is configured to be mechanically connected to one end on one axial side of the motor shaft. The electric unit is housed in the electric unit chamber and is configured to be electrically connected to the motor. The heat medium path is configured to supply the heat medium stored in the gear chamber to the flow path of the motor shaft. The one end of the motor shaft is located in the gear chamber. At least a portion of the electric unit chamber is located closer to the axial side than the one end of the motor shaft. The heat medium path is connected to the flow path of the motor shaft at the one end of the motor shaft.

[0005] The heat medium may be of various types. For example, the heat medium may be oil, water, air, etc. In the above structure, the electric unit chamber can protrude axially to one side compared to one end of the motor shaft. Moreover, a heat medium path is connected to one end of the motor shaft. Thus, the axial width of the drive device can be specified by the electric unit chamber instead of the heat medium path. Therefore, the axial width of the drive device can be suppressed from increasing due to the heat medium path.

[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 medium path.

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

[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 a direction perpendicular to the axial 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 size 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 direction perpendicular to the axial direction can be reduced, and the size 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 medium path may be located on one side in the axial direction with respect to the gear chamber.

[0013] In the driving device of the first embodiment of the present disclosure, a portion of the electric unit chamber may be located on an extension line of the motor shaft extending in one side of the axial direction. The one end of the motor shaft may be supported by a wall between the gear chamber and the electric unit chamber. The heat medium path may be connected to the flow path by passing through the electric unit chamber and penetrating the wall.

[0014] According to the above configuration, the heat medium can be supplied from one end of the motor shaft.

[0015] In the driving device according to the first aspect of the present disclosure, the heat medium 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.

[0016] According to the above configuration, a heat medium path can be formed that reaches one end of the motor shaft via the wall surface of the gear chamber and the inside of the electric unit chamber.

[0017] In the drive device of the first aspect of the present disclosure, the drive device may further include a pump configured to deliver the heat medium stored in the lower portion of the gear chamber to the heat medium path. The pump may be located on one axial side or the other axial side relative to the gear chamber.

[0018] In the drive device of the first aspect of the present disclosure, the drive device may further include a heat medium cooler. The heat medium cooler may also be arranged on the heat medium path and configured to cool the heat medium. The heat medium cooler may also be located on one side of the axial direction or on the other side of the axial direction relative to the gear chamber.

[0019] In the driving 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 heat medium to flow through. The electric unit chamber may be liquid-tightly isolated from the motor chamber and the gear chamber.

[0020] In the drive device of the first aspect of the present disclosure, the housing may also include: a motor housing having the motor chamber, a gear housing 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 housing and the electric unit housing may also be fastened to the motor housing by a plurality of fastening components.

[0021] According to the above structure, the gear housing and the electric unit housing can be assembled independently of each other, thereby improving the ease of assembly of the drive device. 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 elements, 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 according to a comparative example.

[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.

[0028] Figure 6 It is a cross-sectional view showing a schematic structure of a driving device. DETAILED DESCRIPTION

[0029] [Example 1]

[0030] (Structure of driving device 1)

[0031] Figure 1It 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 accommodates 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. It should be noted that in Figure 1 In FIG. 1 , a plurality of shafts (the motor shaft 43 , the intermediate shaft 52 , and the drive shafts 57L and 57R) are developed and shown so as to be located in the same plane.

[0032] 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).

[0033] 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.

[0034] 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 to close the opening AP.

[0035] 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.

[0036] 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.

[0037] The first housing 11 has a box shape with one side open. The first housing 11 is fastened to the facing surface 13s in a manner 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.

[0038] The gear unit 50 includes a shaft gear 51, an intermediate shaft 52, a first intermediate gear 53, a second intermediate 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 and the motor 40 are mechanically connected. The first intermediate gear 53 and the second intermediate gear 54 are mounted on the intermediate shaft 52. The first intermediate gear 53 meshes with the shaft gear 51. The second intermediate 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 passes through 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.

[0039] Figure 2 2 is a perspective view showing the driving device 1. Figure 2 , the state where the cover 15 and the power conversion unit 21 are removed is shown. 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, the first housing 11 includes an electric unit chamber SP2, which includes an opening AP. 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 contains a power conversion unit 21. The power conversion unit 21 is a part for controlling the power supplied to the motor 40 or the power generated. As an example of the components included in the power conversion unit 21, an inverter, a converter, etc. can be cited.

[0040] It should be noted that, 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 the axial one side AD1. In addition, the opposite side is defined as the axial other side AD2. In addition, the direction perpendicular to the central axis CA is defined as the radial direction RD.

[0041] (Structure of oil cooling system and water cooling system)

[0042] 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 strainer 71, an oil pump 72, an oil cooler 73, an oil path 74, and an axial flow path 75. That is, the first heat medium in this embodiment is oil, and the second heat medium is water.

[0043] 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 for flowing into 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.

[0044] 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 component or a channel formed on the wall surface. In this embodiment, at least a part of the oil path 74 is composed of a pipe component.

[0045] 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.

[0046] 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. Then, the oil pump 72 delivers the sucked oil to the oil cooler 73 through the oil passage 74.

[0047] The oil cooler 73 is 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. In the oil cooler 73, the oil path 74 and the water path 83 are arranged to face each other. 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 heat medium path.

[0048] The discharge port of the oil cooler 73 and the one end 43e of the motor shaft 43 are connected by an 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 an extension line of the motor shaft 43 extending toward the axial side AD1 (refer to 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 defining the electric unit chamber SP2 (refer to area A2). Then, the oil passage 74 passes through the electric unit chamber SP2 and penetrates the partition wall 11b (refer to 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.

[0049] The axial flow path 75 is provided with a plurality of discharge holes (not shown) penetrating in the radial direction. The oil flows toward the other axial side AD2 in the axial flow path 75. The oil flows out from the discharge holes and the end of the axial flow path 75 on 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.

[0050] 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 can cool the oil in the oil cooler 73.

[0051] (Effect)

[0052] First, use Figure 3 The driving device 1001 of the comparative example is used to illustrate the subject. Figure 1 ) are used to mark the common parts with the same reference numerals. In the drive device 1001 of the comparative example, the motor shaft 43 has the other end 43e2 on the other axial side AD2. The other end 43e2 is formed with an inlet for flowing into the axial flow path 75. The oil path 74 connects the discharge port of the oil cooler 73 to the other end 43e2 of the motor shaft 43. That is, in the drive device 1 ( Figure 1 ), the oil passage 74 is located on the axial side AD1 relative to the gear chamber SP1. On the other hand, in the drive device 1001 ( Figure 3), the oil passage 74 is located at the other axial side AD2 relative to the motor chamber 31. Therefore, the oil passage 74 protrudes from the end surface 13e of the motor housing 13 by a width W74. Therefore, in the drive device 1001 of the comparative example, the width W1001 in the direction of the central axis CA is increased by a width W74 relative to the width W1 of the housing 10.

[0053] On the other hand, in the driving device 1 ( Figure 1 ), a portion of the electric unit chamber SP2 is located at a position closer to the axial side AD1 than the one end 43e of the motor shaft 43. That is, the electric unit chamber SP2 can be made to protrude to the axial side AD1 compared to the one end 43e of the motor shaft 43. More specifically, the electric unit chamber SP2 can be located at a position closer to the axial side AD1 than the oil passage 74 by a distance DIS. Moreover, the oil passage 74 is connected to the one end 43e of the motor shaft 43. Thus, the oil passage 74 can be accommodated within the range where the electric unit chamber SP2 protrudes. In other words, the width W1 in the direction of the center axis CA of the drive device 1 can be specified by the electric unit chamber SP2 instead of the oil passage 74.

[0054] Therefore, the width W1 of the drive device 1 can be made equal to the width of the housing 10. The width W1 of the drive device 1 can be suppressed from increasing due to the oil passage 74. The size of the drive device 1 can be further reduced in size.

[0055] like Figure 1 As shown, a space is formed in the area on the opposite side of the gear unit 50 relative to the motor shaft 43 due to 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 size of the drive device 1 can be miniaturized.

[0056] 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.

[0057] [Example 2]

[0058] 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 between the first embodiment and the second embodiment, and the description thereof will be omitted.

[0059] Figure 4 A schematic structure of a driving device 201 according to the second embodiment is shown. Figure 4 is with Figure 1Same cross-sectional view. The oil pump 72 is located on one axial side AD1 relative to the gear chamber SP1. That is, the oil pump 72 and the oil cooler 73 are both 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 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 the one end 43e of the motor shaft 43.

[0060] In the drive device 201 of the second embodiment, the oil passage 74 can also be accommodated within the protruding range of the electric unit chamber SP2. The width W1 of the drive device 1 can be suppressed from increasing due to the oil passage 74.

[0061] [Example 3]

[0062] The arrangement of the oil cooler 73 in the third embodiment is different from that in the first embodiment. The same reference numerals are used to indicate the common parts in the first embodiment and the third embodiment, and the description thereof will be omitted.

[0063] Figure 5 A schematic structure of a driving device 301 according to a third embodiment is shown. Figure 5 is with Figure 1 The same cross-sectional view. The oil cooler 73 is located on the other axial side AD2 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 cooler 73 overlaps the gear chamber SP1 in the axial direction of the central axis CA. 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 the one end 43e of the motor shaft 43.

[0064] In the drive device 301 of the third embodiment, it is also possible to suppress the width W1 of the drive device 1 from increasing due to the oil passage 74 .

[0065] [Example 4]

[0066] 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 of the first embodiment and the fourth embodiment, and the description thereof is omitted. Figure 6 A schematic structure of a driving device 401 according to a fourth embodiment is shown. Figure 6 is with Figure 1 The same cross-sectional view. In addition, Figure 6 In the present invention, the elements unique to Example 4 are distinguished by marking them with the figure mark of the 400 segment.

[0067] The housing 410 includes a first housing 411, a second housing 412, and the 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.

[0068] 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 an extension line of the motor shaft 43 extending toward the axial side AD1 (see region A1).

[0069] (Effect)

[0070] By forming the first housing 411 that accommodates the gear unit 50 and the second housing 412 that accommodates the power conversion unit 21 separately, the power conversion unit 21 can be installed with only the second housing 412 removed from the motor housing 13. As a result, when the power conversion unit 21 is installed, there is no interference from the second housing 412. Therefore, the direction in which the tool approaches the contact portion between the power conversion unit 21 and the facing surface 13s can be expanded (see the dotted arrow Y1). The assembly performance of the power conversion unit 21 can be improved.

[0071] The above is a detailed description of the implementation methods, but these are only examples and do not limit the scope of protection of the claims. The technologies described in the scope of protection of the claims include technologies obtained by various deformations and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings exert technical usefulness alone or through various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the technologies exemplified in this specification or the drawings are technologies that achieve multiple purposes at the same time, and achieving one of the purposes itself has technical usefulness.

[0072] (Variation)

[0073] 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: The driving device comprises: A motor is housed in the motor chamber and includes a motor shaft, wherein a flow path is arranged at the axis of the motor shaft; a housing, the housing comprising the motor chamber, the gear chamber, and the electric unit chamber; a gear unit, the gear unit being housed in the gear chamber and being configured to be mechanically connected to one end of the motor shaft on one axial side; an electric unit housed in the electric unit chamber and configured to be electrically connected to the motor; and A heat medium path configured to supply the heat medium stored in the gear chamber to the flow path of the motor shaft, wherein: The one end of the motor shaft is located in the gear chamber, At least a portion of the electric unit chamber is located closer to one side in the axial direction than the one end of the motor shaft, and The heat medium path is connected to the flow path of the motor shaft at the one end of the motor shaft.

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 medium path.

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

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 medium path is 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: A portion of the electrical unit chamber is located on an extension line of the motor axis extending toward one side of the axis. The one end of the motor shaft is supported by a partition wall between the gear chamber and the electric unit chamber, and The heat medium path passes through the electric unit room and penetrates the partition wall to be connected to the flow path.

7. The driving device according to claim 6, characterized in that: The heat medium path extends from the outside of the housing into the electric unit room through a wall surface of the housing that defines the electric unit room.

8. The driving device according to claim 1, characterized in that: The driving device further includes a pump configured to deliver the heat medium stored in the lower portion of the gear chamber to the heat medium path, wherein: The pump is located on one axial side or the other axial side relative to the gear chamber.

9. The driving device according to claim 8, characterized in that The driving device further includes a heat medium cooler, which is arranged on the heat medium path and configured to cool the heat medium, wherein: The heat medium cooler is located on one side in the axial direction or on the other side in the axial direction with respect to the gear chamber.

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

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

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