Drive apparatus

Abstract

To provide a drive apparatus for a vehicle.SOLUTION: A drive apparatus includes: a casing that includes a motor chamber, a gear chamber and an electric unit chamber; a motor that is housed in the motor chamber, a motor shaft of the motor having one end on the one axial-direction side positioned in the gear chamber; a gear unit that is housed in the gear chamber; an electric unit that is housed in the electric unit chamber; a first route that supplies, to the motor, a first heat medium that cools the motor; a second route that supplies, to the electric unit, a second heat medium that cools the electric unit; and a heat exchanger that performs heat exchange between the first heat medium and the second heat medium. At least a part of the electric unit chamber is positioned closer on the one axial-direction side than the gear chamber. At least a part of the heat exchanger overlaps with the gear chamber in the axial direction and also overlaps with the electric unit chamber in a radial direction perpendicular to the axial direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] An integrated drive unit having a motor chamber, a gear chamber, and an electric unit chamber is known. Also, a technique of mounting an oil cooler on the integrated drive unit is known. Note that Patent Document 1 discloses a related technique. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-68637 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an integrated drive unit, there is a demand for a compact size of the drive unit. However, depending on the mode in which an oil cooler is mounted on the drive unit, the size of the drive unit may increase due to the oil cooler. [Means for solving the problem]

[0005] The present specification discloses a drive device for a vehicle, comprising a casing including a motor chamber, a gear chamber, and an electric unit chamber. The drive device is housed in the motor chamber, and comprises a motor having a motor shaft, with one end of the motor shaft located in the gear chamber. The drive device is housed in the gear chamber, and comprises a gear unit mechanically connected to one end of the motor shaft. The drive device is housed in the electric unit chamber, and comprises an electric unit electrically connected to the motor. The drive device comprises a first path for supplying a first heat medium for cooling the motor to the motor. The drive device comprises a second path for supplying a second heat medium for cooling the electric unit to the electric unit. The drive device comprises a heat exchanger provided on the first path and the second path, and exchanging heat between the first heat medium and the second heat medium. At least a part of the electric unit chamber is located on one side in the axial direction of the gear chamber. At least a part 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.

[0006] In the above configuration, at least a portion of the heat exchanger overlaps with the gear chamber in the axial direction of the motor shaft. This makes it possible to prevent the axial width of the drive unit from being increased by the heat exchanger. Also, in the above configuration, at least a portion of the heat exchanger overlaps with the electric unit chamber in a radial direction perpendicular to the axial direction. This makes it possible to prevent the radial width of the drive unit from being increased by the heat exchanger. This makes it possible to reduce the size of the drive unit. [Brief description of the drawings]

[0007] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of a drive device 1. FIG. [Diagram 2] FIG. 2 is a perspective view of the drive device 1. [Diagram 3] 2 is a cross-sectional view showing a schematic configuration of a driving device 201. FIG. [Figure 4] 2 is a cross-sectional view showing a schematic configuration of a driving device 301. FIG. [Diagram 5]4 is a cross-sectional view showing a schematic configuration of a driving device 401. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] At least a part of the electric unit chamber may be located on one axial side of the heat exchanger.

[0009] According to the above configuration, it is possible to suppress an increase in the axial width of the drive device due to the heat exchanger.

[0010] At least a portion of the electric unit chamber may overlap the gear chamber in the radial direction.

[0011] According to the above-mentioned configuration, the amount of protrusion of the electric unit chamber toward one side in the axial direction can be reduced, and the size of the drive device can be reduced.

[0012] At least a portion of the electric unit chamber may overlap with the motor chamber in the axial direction.

[0013] According to the above-mentioned configuration, the amount of protrusion of the electric unit chamber in the radial direction perpendicular to the axial direction can be reduced, and the size of the drive device can be reduced.

[0014] At least a portion of the heat exchanger and at least a portion of the first passage may be located on one axial side of the gear chamber.

[0015] At least a portion of the first passage may be formed of a pipe member.

[0016] The first passage may extend from the exterior of the casing, through a wall defining the electrical unit chamber of the casing, and into the electrical unit chamber.

[0017] According to the above configuration, a first path can be formed that passes through the wall surface of the gear chamber and the inside of the electric unit chamber and reaches one end of the motor shaft.

[0018] A part of the electric unit chamber may be located on an extension of the motor shaft to one axial side. One end of the motor shaft may be supported by a partition wall between the gear chamber and the electric unit chamber. A flow path may be formed in the axial center of the motor shaft. The first path may pass through the electric unit chamber and penetrate the partition wall, and may be connected to the flow path at one end.

[0019] According to the above configuration, the heat medium can be supplied from one end of the motor shaft.

[0020] The drive device may further include a pump that delivers the first heat medium stored in the gear chamber to the first path. The pump may be located on one axial side or the other axial side of the gear chamber. A heat exchanger may be disposed in a section of the first path that connects the pump and one end of the motor shaft.

[0021] The motor chamber and the gear chamber may be connected by a communication hole through which the first heat medium can flow. The electric unit chamber may be liquid-tightly isolated from the motor chamber and the gear chamber.

[0022] The casing may include a motor case having a motor chamber, a gear case defining at least a portion of the gear chamber, and an electric unit case defining at least a portion of the electric unit chamber. The gear case and the electric unit case may be fastened to the motor case by a plurality of fastening members.

[0023] According to the above-mentioned configuration, the gear case and the electric unit case can be assembled independently of each other, which makes it easier to assemble the drive device. EXAMPLES

[0024] (Configuration of driving device 1) FIG. 1 is a cross-sectional view showing a schematic configuration of a drive unit 1 of this embodiment. The drive unit 1 is an integrated device in which a motor, a gear unit, and a power conversion unit for controlling the motor are housed in the same casing. The directions FR, RH, and UP indicate the orientation of the drive unit 1 with respect to the vehicle (electric vehicle) when the drive unit 1 is mounted on the vehicle. The direction FR indicates the front in the longitudinal direction of the vehicle. The direction RH indicates the right in the lateral direction (or width direction) of the vehicle. The direction UP indicates the upward direction in the vertical direction of the vehicle. The same applies to other drawings. In FIG. 1, multiple shafts (motor shaft 43, countershaft 52, drive shafts 57L and 57R) are shown developed so as to be located on the same plane.

[0025] The drive 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 by signal lines (not shown).

[0026] The drive unit 1 includes a casing 10. The casing 10 includes a first case 11, a motor case 13, and a cover portion 15. The first case 11 and the motor case 13 may be cast metal.

[0027] The first case 11 has a first flange 11f extending along the outer periphery of the first case 11. The motor case 13 has a motor case flange 13f extending along the outer periphery of the motor case 13. The first case 11 is fastened to the motor case 13 by a plurality of bolts 60. The first case 11 also has an opening AP. A lid portion 15 is fastened to the first case 11 by the plurality of bolts 60 so as to close the opening AP.

[0028] The motor case 13 includes a motor chamber 31. The motor chamber 31 houses the motor 40. In other words, the motor case 13 houses 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 disposed inside the stator 41. The motor shaft 43 includes a central axis CA.

[0029] The motor case 13 also has an opposing surface 13s that faces the first case 11. A motor shaft hole MH and a drive shaft hole DH1 are formed in the opposing surface 13s. The motor shaft 43 passes through the motor shaft hole MH. The left drive shaft 57L passes through the drive shaft hole DH1.

[0030] The first case 11 has a box shape with one side open. The first case 11 is fastened to the opposing surface 13s so that the opening side is closed by the opposing surface 13s. This defines a gear chamber SP1 between the motor case 13 and the first case 11. The gear unit 50 is stored in the gear chamber SP1. In other words, the first case 11 houses the gear unit 50.

[0031] 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 attached to the motor shaft 43. This mechanically connects the gear unit 50 and the motor 40. The countershaft 52 is attached with the first counter gear 53 and the second counter gear 54. 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 attached to the differential gear 56. A pair of drive shafts 57L and 57R extend in the vehicle width direction from the differential gear 56. The drive shaft 57R passes through a drive shaft hole DH2 formed in the first case 11. A reservoir 58 is provided at the bottom of the gear chamber SP1. Oil 61 is stored in the reservoir 58. A portion of the gear unit 50 is immersed in oil 61 stored in the storage portion 58 .

[0032] FIG. 2 shows a perspective view of the drive unit 1. FIG. 2 shows a state in which the cover 15 and the power conversion unit 21 are removed. The position of one end 43e of the motor shaft 43 is indicated by a dotted line. As shown in FIGS. 1 and 2, the first case 11 is provided with an electric unit chamber SP2 having an opening AP. The opening AP can be sealed by fastening the cover 15 with a bolt 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 houses the electric power conversion unit 21. The electric power conversion unit 21 is a part for controlling the power supplied to the motor 40 and the generated power. Examples of components included in the electric power conversion unit 21 include an inverter and a converter.

[0033] In the axial direction of the central axis CA of the motor shaft 43, the side on which the shaft gear 51 is arranged is defined as one axial side AD1. The opposite side is defined as the other axial side AD2. The direction perpendicular to the central axis CA is defined as the radial direction RD.

[0034] (Oil-cooled and water-cooled system configurations) The drive unit 1 includes an oil cooling system and a water cooling system. First, the oil cooling system will be described. The oil cooling system includes a strainer 71, an oil pump 72, an oil cooler 73, an oil passage 74, and an axial flow passage 75. That is, the first heat medium in this embodiment is oil, and the second heat medium is water.

[0035] The axial flow passage 75 is a flow passage formed on the axis of the hollow (cylindrical) motor shaft 43. The motor shaft 43 also has one end 43e on one axial side AD1. The one end 43e is located in the gear chamber SP1. An inlet to the axial flow passage 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.

[0036] The oil passage 74 is a path that supplies oil to the motor 40. The structure of the oil passage 74 may be various. For example, it may be a pipe member or a tunnel formed in a wall surface. In this embodiment, at least a portion of the oil passage 74 is configured with a pipe member.

[0037] The oil passage 74 connects the discharge port of the oil pump 72 to the inlet of the oil cooler 73, and also connects the discharge port of the oil cooler 73 to one end 43e of the motor shaft 43. In other words, the oil cooler 73 is disposed in a section of the oil passage 74 that connects the oil pump 72 to one end 43e of the motor shaft 43. The oil passage 74 allows the oil stored in the gear chamber SP1 to be supplied to the axial flow path 75 of the motor shaft 43.

[0038] 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 with respect to the gear chamber SP1. The oil pump 72 draws in the oil 61 in the reservoir 58 through the strainer 71. The oil pump 72 then delivers the drawn oil to an oil cooler 73 through an oil passage 74.

[0039] The oil cooler 73 is a heat exchanger that cools oil by exchanging heat with cooling water. The oil cooler 73 is located on one axial side AD1 of the gear chamber SP1. That is, the oil cooler 73 and the oil pump 72 face each other via the gear chamber SP1. The oil cooler 73 overlaps with the gear chamber SP1 in the axial direction of the central axis CA. The oil cooler 73 also overlaps with the electric unit chamber SP2 in the radial direction RD. An oil passage 74 and a water passage 83 are disposed opposite each other in the oil cooler 73. In other words, the oil cooler 73 is provided on the oil passage 74 and the water passage 83. In this embodiment, the first path corresponds to the oil passage 74, and the second path corresponds to the water passage 73.

[0040] The discharge port of the oil cooler 73 and 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 one end 43e is located on one axial side AD1 with respect to the gear chamber SP1. More specifically, a part of the electric unit chamber SP2 is located on an extension line of the motor shaft 43 to the one axial side AD1 (see region A1). The oil passage 74 passes through a wall surface 11w that defines the electric unit chamber SP2 from the outside of the casing 10 and extends into the electric unit chamber SP2 (see region A2). The oil passage 74 passes through the electric unit chamber SP2 and penetrates the partition wall 11b (see region A3). An end of the oil passage 74 is connected to the axial flow passage 75 at one end 43e of the motor shaft 43.

[0041] The axial flow passage 75 is provided with a plurality of discharge holes (not shown) penetrating in the radial direction. The oil flows through the axial flow passage 75 to the other axial side AD2. The oil is discharged from the discharge holes and the end of the axial flow passage 75 on the other axial side AD2, and is supplied to the rotor 42, the stator 41, and the like. The oil supplied to the motor 40 by the axial flow passage 75 flows downward in the motor chamber 31. The flowing oil returns to the reservoir 58 in the gear chamber SP1 via the communication hole 16 provided in the partition wall between the motor chamber 31 and the gear chamber SP1.

[0042] Next, the water-cooling system will be described. The water-cooling system includes a water pump 81, a radiator 82, and a water passage 83. The water passage 83 is a path that supplies cooling water to the power conversion unit 21. The water passage 83 is a path that circulates water from the water pump 81 through the radiator 82, the power conversion unit 21, and the oil cooler 73 to the water pump 81. The cooling water circulating through the water passage 83 can cool the power conversion unit 21 and also cool the oil in the oil cooler 73.

[0043] (effect) In the drive unit 1 of this embodiment, the oil cooler 73 overlaps with the gear chamber SP1 in the axial direction of the central axis CA. This allows the oil cooler 73 to be present within the range of the gear chamber SP1 when viewed from the axial direction of the central axis CA. Therefore, at least a portion of the oil cooler 73 does not protrude from the casing 10 in the radial direction RD. This prevents the width of the drive unit 1 in the radial direction RD from being increased by the oil cooler 73. The size of the drive unit 1 can be reduced.

[0044] In the drive unit 1 of this embodiment, the oil cooler 73 overlaps with the electric unit chamber SP2 in the radial direction RD. Also, a part of the electric unit chamber SP2 is located on the one axial side AD1 by a distance DIS from the oil cooler 73. This allows the oil cooler 73 to be present within the range of the electric unit chamber SP2 when viewed from the radial direction RD. In other words, the oil cooler 73 can be accommodated within the range in which the electric unit chamber SP2 protrudes. Therefore, at least a part of the oil cooler 73 does not protrude from the casing 10 to the one axial side AD1. This prevents the width of the drive unit 1 in the axial direction of the central axis CA from being increased by the oil cooler 73. The size of the drive unit 1 can be reduced.

[0045] The longer the distance from the discharge port of the oil cooler 73 to the inlet (one end 43e) of the axial flow passage 75, the greater the piping resistance of the oil passage 74. Therefore, in the technology of this embodiment, both the oil cooler 73 and the one end 43e are disposed on one axial side AD1 with respect to the gear chamber SP1. This makes it possible to shorten the distance from the discharge port of the oil cooler 73 to the one end 43e compared to the case where the oil cooler 73 is disposed on the other axial side AD2 with respect to the gear chamber SP1. Since the piping resistance of the oil passage 74 can be reduced, it is possible to increase the oil flow rate while maintaining the capacity of the oil pump 72, or to reduce the size of the oil pump 72 while maintaining the oil flow rate.

[0046] As shown in FIG. 1, a space is formed in the area on the opposite side of the motor shaft 43 from the gear unit 50 due to the dimensional difference between the motor 40 and the gear unit 50. A part of the electric unit chamber SP2 is disposed 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. This makes it possible to effectively utilize the space around the motor shaft 43. This makes it possible to reduce the amount of protrusion of the electric unit chamber SP2 on one axial side AD1. This makes it possible to reduce the size of the drive unit 1.

[0047] In addition, at least a portion of the electric unit chamber SP2 overlaps with the motor chamber 31 in the axial direction of the central axis CA. This also makes it possible to effectively utilize the space around the motor shaft 43. As a result, the amount of protrusion of the electric unit chamber SP2 in the radial direction RD can be reduced. EXAMPLES

[0048] The second embodiment differs from the first embodiment in the arrangement of an oil pump 72. The same reference numerals are used to designate parts common to the first and second embodiments, and description thereof will be omitted.

[0049] FIG. 3 shows a schematic configuration of a drive unit 201 of the second embodiment. FIG. 3 is a cross-sectional view similar to FIG. 1. The oil pump 72 is located on one axial side AD1 with respect to the gear chamber SP1. That is, both the oil pump 72 and the oil cooler 73 are arranged on the same side with respect 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. The oil pump 72 and the oil cooler 73 also 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 to the inlet of the oil cooler 73, and also connects the discharge port of the oil cooler 73 to one end 43e of the motor shaft 43.

[0050] In the drive device 201 of the second embodiment as well, at least a portion of the oil cooler 73 does not protrude from the casing 10 in the radial direction RD or to the one axial side AD1. It is possible to prevent the size of the drive device 1 from being increased by the oil cooler 73. EXAMPLES

[0051] In the third embodiment, the layout of the oil passage 74 is different from that in the first embodiment. The same reference numerals are used to designate parts common to the first and third embodiments, and the description thereof will be omitted. Fig. 4 shows a schematic configuration of a drive device 301 in the third embodiment. Fig. 4 is a cross-sectional view similar to Fig. 1.

[0052] In the driving device 301 of the third embodiment, the motor shaft 43 has the other end 43e2 on the other axial side AD2. An inlet to the axial flow passage 75 is formed at the other end 43e2. The oil pump 72 is located on the one axial side AD1 with respect to the gear chamber SP1. That is, both the oil pump 72 and the oil cooler 73 are arranged on the same side with respect 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. 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 to the inlet of the oil cooler 73 and also connects the discharge port of the oil cooler 73 to the other end 43e2 of the motor shaft 43. The oil flows through the axial flow passage 75 to the one axial side AD1.

[0053] In the drive device 301 of the third embodiment as well, it is possible to prevent the size of the drive device 1 from being increased by the oil cooler 73. EXAMPLES

[0054] The fourth embodiment differs from the first embodiment in the aspect of the casing. The same reference numerals are used to designate parts common to the first and fourth embodiments, and the description thereof will be omitted. FIG. 5 shows a schematic configuration of a drive device 401 of the fourth embodiment. FIG. 5 is a cross-sectional view similar to FIG. 1. In FIG. 5, elements unique to the fourth embodiment are distinguished by being assigned reference numerals in the 400 range.

[0055] The casing 410 includes a first case 411, a second case 412, and a motor case 13. The first case 411 is fastened to an opposing surface 13s of the motor case 13 by a plurality of bolts 60. A gear chamber SP1 is defined between the motor case 13 and the first case 411.

[0056] The second case 412 has a box shape with one side open. The second case 412 is fastened to the opposing surface 13s and the upper surface 411u of the first case 411 by a plurality of bolts 60. This defines an electric unit chamber SP2 between the motor case 13 and the first case 411, and the second case 412. Therefore, by assembling the second case 412 on the first case 411, a part of the electric unit chamber SP2 can be positioned on an extension line to one axial side AD1 of the motor shaft 43 (see area A1).

[0057] (effect) By configuring the first case 411 that houses the gear unit 50 and the second case 412 that houses the power conversion unit 21 as separate bodies, it is possible to attach the power conversion unit 21 with only the second case 412 removed from the motor case 13. This prevents interference from the second case 412 when attaching the power conversion unit 21. This makes it possible to widen the access direction of a tool to the contact portion between the power conversion unit 21 and the opposing surface 13s (see dotted arrow Y1). This improves the ease of assembly of the power conversion unit 21.

[0058] Although the embodiments have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or drawings achieves multiple objectives simultaneously, and achieving one of the objectives itself has technical utility.

[0059] (Modification) The vehicle in which the drive device of this specification is installed is not limited to an electric vehicle. The drive device of this specification can be installed in, for example, a hybrid vehicle or a plug-in hybrid vehicle. In this case, the drive device of this specification may house multiple motors in a casing, or may house a planetary gear mechanism. The drive device of this specification can also be applied to vehicles that use an electric motor for at least part of the driving, such as a fuel cell vehicle. [Explanation of symbols]

[0060] 1: Drive unit 10: Casing 21: Power conversion unit 40: Motor 43: Motor shaft 43e: One end 50: Gear unit 61: Oil 73: Oil cooler 74: Oil passage 75: Axial flow passage 83: Water passage AD1: One axial side SP1: Gear chamber SP2: Electric unit chamber

Claims

1. A drive device for a vehicle, comprising: a casing including a motor chamber, a gear chamber, and an electric unit chamber; a motor housed in the motor chamber and including a motor shaft, the motor having one end on one axial side of the motor shaft positioned in the gear chamber; a gear unit housed in the gear chamber and mechanically connected to the one end of the motor shaft; an electric unit accommodated in the electric unit chamber and electrically connected to the motor; a first path for supplying a first heat medium to the motor for cooling the motor; a second path for supplying a second heat medium to the electric unit for cooling the electric unit; a heat exchanger provided on the first path and the second path, exchanging heat between the first heat medium and the second heat medium; Equipped with At least a portion of the electric unit chamber is located on one side in the axial direction relative to the gear chamber, 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. Drive unit.

2. The drive unit according to claim 1 , wherein 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 drive device according to claim 2 , wherein at least a portion of the electric unit chamber overlaps with the gear chamber in the radial direction.

4. The drive device according to claim 3 , wherein at least a portion of the electric unit chamber overlaps with the motor chamber in the axial direction.

5. The drive unit according to claim 1 , wherein at least a portion of the heat exchanger and at least a portion of the first passage are located on one axial side of the gear chamber.

6. The drive device according to claim 5 , wherein at least a portion of the first path is formed of a pipe member.

7. The drive device according to claim 5 , wherein the first path extends from an exterior of the casing, through a wall surface of the casing that defines the electric unit chamber, and into the electric unit chamber.

8. a part of the electric unit chamber is located on an extension line of the motor shaft toward one axial side, the one end of the motor shaft is supported by a partition wall between the gear chamber and the electric unit chamber, A flow passage is formed in the axial center of the motor shaft, The drive unit according to claim 7 , wherein the first path passes through the electric unit chamber and penetrates the partition wall, and is connected to the flow path at the one end.

9. The drive device further includes a pump that sends the first heat medium stored in the gear chamber to the first path, the pump is located on one axial side or the other axial side with respect to the gear chamber, The drive device according to claim 8 , wherein the heat exchanger is disposed in a section of the first path that connects the pump and the one end of the motor shaft.

10. the motor chamber and the gear chamber are connected by a communication hole through which the first heat medium can flow, The drive device according to claim 1 , wherein the electric unit chamber is liquid-tightly isolated from the motor chamber and the gear chamber.

11. the casing includes a motor case having the motor chamber, a gear case defining at least a portion of the gear chamber, and an electric unit case defining at least a portion of the electric unit chamber, The drive unit according to claim 1 , wherein the gear case and the electric unit case are fastened to the motor case by a plurality of fastening members.

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