Vehicle drive device

Abstract

To cool a power module without needing arrangement of a cooling hose in a case in a structure in which a rotary electric machine and the power module are housed in the case.SOLUTION: A vehicle drive device includes: a rotary electric machine; a power module having a power semiconductor device and configured to convert electric power to be supplied to the rotary electric machine; and a case which houses the rotary electric machine and the power module. The case has a ventilation hole below the power module. The ventilation hole includes an introduction port which is open to the front in a vehicle fore and aft direction and a discharge port which is located at the rear relative to the introduction port and open to the rear or the side.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] There is known a technique for cooling the power module by housing a rotating electric machine and a power module in separate housing chambers in cases and forming a cooling water passage below the power module. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Patent Publication No. 2016 / 051535 Brochure Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-described conventional technology, depending on the mounting position of the vehicle, it may be difficult to route the cooling hose to the unit of the vehicle drive device.

[0005] Therefore, in one aspect, the present disclosure has an object to make it possible to cool the power module in a configuration in which a rotating electric machine and a power module are housed in a case without requiring the installation of a cooling hose in the case. [Means for solving the problem]

[0006] In one aspect, a rotating electric machine; a power module having a power semiconductor element and converting power to be supplied to the rotating electric machine; a case that houses the rotating electric machine and a power module, the case has a ventilation hole on a lower side of the power module, In the vehicle drive device, the ventilation hole has an inlet opening forward in the vehicle longitudinal direction, and has an exhaust outlet opening rearward or laterally behind the inlet. Effect of the Invention

[0007] According to one aspect of the present disclosure, in a configuration in which a rotating electric machine and a power module are housed in a case, it is possible to cool the power module without the need to route a cooling hose to the case. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic top view showing a state in which a vehicle drive device is mounted in a vehicle. [Diagram 2] FIG. 1 is a skeleton diagram showing a vehicle drive device. [Diagram 3] 1 is a top view that illustrates a vehicle drive device according to an embodiment of the present invention; [Figure 4] FIG. 4 is an explanatory diagram of the arrangement of ventilation holes in the present embodiment, and is a top view in which the components in the inverter accommodating chamber in the diagram shown in FIG. 3 are omitted. [Diagram 5] 2 is a cross-sectional view of a main portion of the vehicle drive device according to the embodiment, the cross-sectional view being taken along a cross section passing through the ventilation hole; FIG. [Figure 6] 11A and 11B are explanatory diagrams of modified examples of the arrangement of ventilation holes in the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not intended to be limiting, and shapes and the like in the drawings may be partially exaggerated for the sake of explanation.

[0010] In this specification, "driving connection" refers to a state in which two rotating elements are connected so as to be able to transmit a driving force (synonymous with torque), and includes a state in which the two rotating elements are connected so as to rotate integrally, or a state in which the two rotating elements are connected so as to be able to transmit a driving force via one or more transmission members. Such transmission members include various members (e.g., shafts, gear mechanisms, belts, chains, etc.) that transmit rotation at the same speed or at a variable speed. Note that the transmission members may also include engagement devices (e.g., friction engagement devices, meshing engagement devices, etc.) that selectively transmit rotation and driving force.

[0011] In this specification, the term "rotating electric machine" is used as a concept including a motor, a generator, and a motor-generator that functions as both a motor and a generator as necessary. In addition, in this specification, with respect to the arrangement of two components, "overlapping when viewed in a specific direction" means that when a virtual line parallel to the line of sight is moved in each direction perpendicular to the virtual line, there is at least a part of an area where the virtual line intersects with both of the two components. In addition, in this specification, with respect to the arrangement of two components, "arrangement areas in a specific direction overlap" means that at least a part of the arrangement area of ​​the other component in a specific direction is included within the arrangement area of ​​one component in a specific direction.

[0012] Fig. 1 is a schematic top view showing a state in which a vehicle drive device 100 is mounted in a vehicle VC. Fig. 2 is a skeleton diagram showing the vehicle drive device 100. Fig. 3 is a top view showing the vehicle drive device 100 according to this embodiment, and in Fig. 3, the inverter cover member 203 on the upper part of the inverter case part 24 is omitted so that the elements arranged inside the inverter case part 24 can be seen.

[0013] As shown typically in Fig. 1, the vehicle drive device 100 includes a rotating electric machine 1, a pair of output members 6 drivingly connected to a pair of wheels W (see Fig. 1), a transmission mechanism 3 that transmits driving force between the rotating electric machine 1 and the pair of output members 6, and an inverter device 90 that drives and controls the rotating electric machine 1. The vehicle drive device 100 further includes a case 2 that houses the rotating electric machine 1 and the inverter device 90. The case 2 also houses the pair of output members 6 and the transmission mechanism 3.

[0014] The first output member 61, which is one of the pair of output members 6, is drivingly connected to the first wheel W1, which is one of the pair of wheels W, and the second output member 62, which is the other of the pair of output members 6, is drivingly connected to the second wheel W2, which is the other of the pair of wheels W. As shown in FIG. 1, the vehicle VC on which the vehicle drive device 100 is mounted includes a first drive shaft 63 that rotates integrally with the first wheel W1 and a second drive shaft 64 that rotates integrally with the second wheel W2. The first drive shaft 63 is connected to the first wheel W1 via, for example, a constant velocity joint, and the second drive shaft 64 is connected to the second wheel W2 via, for example, a constant velocity joint. The first output member 61 is connected to the first drive shaft 63 so as to rotate integrally with the first drive shaft 63, and the second output member 62 is connected to the second drive shaft 64 so as to rotate integrally with the second drive shaft 64.

[0015] The vehicle drive device 100 transmits the output torque of the rotating electric machine 1 to a pair of wheels W via a pair of output members 6, and drives the vehicle VC on which the vehicle drive device 100 is mounted. That is, the rotating electric machine 1 is a driving force source for the pair of wheels W. The pair of wheels W is a pair of left and right wheels (for example, a pair of left and right front wheels, or a pair of left and right rear wheels) on the vehicle VC. The rotating electric machine 1 may be, for example, an AC rotating electric machine driven by three-phase AC (an example of polyphase AC). The rotating electric machine 1 is electrically connected to a battery (not shown) via an inverter device 90 that performs power conversion between DC power and AC power, and receives power from the battery for power running, or supplies power generated by the inertial force of the vehicle VC to the battery for storage.

[0016] As shown in Fig. 2, the rotating electric machine 1 and the pair of output members 6 are arranged on two parallel axes (specifically, a first axis C1 and a second axis C2). Specifically, the rotating electric machine 1 is arranged on the first axis C1, and the pair of output members 6 are arranged on a second axis C2 different from the first axis C1. The first axis C1 and the second axis C2 are axes (virtual axes) arranged parallel to each other. The transmission mechanism 3 includes an output gear (ring gear) 30 drivingly connected to at least one of the pair of output members 6, coaxially with the pair of output members 6 (i.e., on the second axis C2).

[0017] As shown in FIG. 1, the vehicle drive device 100 is mounted on the vehicle VC with the axial direction A oriented along the vehicle left-right direction. The axial direction A is a direction parallel to the first axis C1 and the second axis C2, in other words, an axial direction common to the first axis C1 and the second axis C2. That is, the axial direction A is a direction in which the rotation axis of the rotating electric machine 1 extends, and is also a direction in which the rotation axis of the pair of output members 6 extends. Here, one side of the axial direction A is defined as the axial first side A1, and the other side of the axial direction A (the side opposite to the axial first side A1 in the axial direction A) is defined as the axial second side A2. The axial first side A1 is a side on which the rotating electric machine 1 is disposed with respect to the transmission mechanism 3 in the axial direction A. As shown in FIG. 2, the first output member 61 is the output member 6 disposed on the axial first side A1 of the pair of output members 6, and the second output member 62 is the output member 6 disposed on the axial second side A2 of the pair of output members 6.

[0018] As shown in Fig. 1, the vehicle driving device 100 may be mounted on the vehicle VC with the first axial side A1 facing the right side of the vehicle and the second axial side A2 facing the left side of the vehicle. In this case, the first wheel W1 to which the first output member 61 is drivingly connected is the right wheel, and the second wheel W2 to which the second output member 62 is drivingly connected is the left wheel. Fig. 1 assumes that the vehicle driving device 100 is a front-wheel drive type driving device that drives a pair of left and right front wheels. Therefore, in the example shown in Fig. 1, the first wheel W1 is the right front wheel, and the second wheel W2 is the left front wheel.

[0019] The transmission mechanism 3 includes a reduction gear 34 in a power transmission path between the rotating electric machine 1 and the output gear 30. The reduction gear 34 is optional, and in the present embodiment, as an example, the reduction gear 34 is a reduction gear using a counter gear on a third shaft C3 parallel to the first shaft C1 and the second shaft C2. In a modified example, the reduction gear 34 may be a reduction gear using a planetary gear on the first shaft C1.

[0020] The transmission mechanism 3 further includes a differential gear mechanism 5. The differential gear mechanism 5 distributes the driving force transmitted from the rotating electric machine 1 to a pair of output members 6. The differential gear mechanism 5 may be arranged coaxially with the pair of output members 6 (i.e., on the second axis C2). The differential gear mechanism 5 distributes the driving force transmitted from the rotating electric machine 1 to the output gear 30 to the pair of output members 6. In other words, the output gear 30 is drivingly connected to both of the pair of output members 6 via the differential gear mechanism 5. The differential gear mechanism 5 may be a bevel gear type differential gear mechanism, and the output gear 30 may be connected to a differential case portion 50 included in the differential gear mechanism 5 so as to rotate integrally with the differential case portion 50.

[0021] In this embodiment, the case 2 includes an integrated motor case portion 21, a transmission mechanism case portion 22, an output shaft case portion 23, and an inverter case portion 24. Here, the term "integrated" includes an integrated form using fastening members such as bolts, and an integrated form by integral molding (for example, casting or casting using aluminizing, etc.).

[0022] The motor case portion 21 houses the rotating electric machine 1, the transmission mechanism case portion 22 houses the transmission mechanism 3, and the output shaft case portion 23 houses the first output member 61. The inverter case portion 24 forms an inverter accommodating chamber S4 that houses the inverter device 90. Note that the inverter case portion 24 forming the inverter accommodating chamber S4 means that the wall portions that bound the inverter accommodating chamber S4 form the inverter case portion 24.

[0023] In the following description, the case 2 is formed by joining a case member 200, a motor cover member 201, a differential cover member 202, and an inverter cover member 203 (see FIG. 5 described later), for example. The joining method may be fastening with bolts or the like.

[0024] The case member 200 may be formed as a one-piece member (for example, a single member made of a common material formed by a die casting method). In this case, the motor accommodating chamber (not shown) and the transmission mechanism accommodating chamber S2 may be partitioned by a single partition wall (not shown).

[0025] The case member 200 is open in the axial direction A on a first axial side A1 and is also open in the axial direction A on a second axial side A2.

[0026] The motor cover member 201 is provided so as to cover an opening on the first axial side A1 of the case member 200 (i.e., an opening on the first axial side A1 of the motor accommodating chamber). The motor cover member 201 may be formed as a one-piece member. The motor cover member 201 may be joined to an end face (joint surface) of the first axial side A1 of the case member 200. In this case, a joint surface (mating surface) 221 between the motor cover member 201 and the case member 200 may extend in a plane perpendicular to the axial direction A.

[0027] The differential cover member 202 is provided so as to cover an opening on the second axial side A2 of the case member 200 (i.e., an opening on the second axial side A2 of the transmission mechanism accommodating chamber S2). The differential cover member 202 may be formed as a one-piece member. The differential cover member 202 may be joined to an end face (joint surface) of the second axial side A2 of the case member 200. In this case, a joint surface (mating surface) 222 between the differential cover member 202 and the case member 200 may extend in a plane perpendicular to the axial direction A.

[0028] The inverter cover member 203 is provided so as to cover the opening of the inverter accommodating chamber S4 in the case member 200. The inverter cover member 203 may be formed as a one-piece member.

[0029] The inverter device 90 may be in the form of a module, and may be fixed to a wall portion forming the inverter case portion 24 by bolts or the like. The inverter device 90 includes a power module PM including a plurality of switching elements (power semiconductor elements, not shown) constituting an inverter circuit, a control board (not shown) on which a control device for controlling the inverter circuit is mounted, a smoothing capacitor CM for smoothing the voltage between the positive and negative poles on the DC side of the inverter circuit, and a bus bar structure 70. The inverter device 90 may further include various sensors such as a current sensor 889 (described later), a filter (not shown) such as a Y capacitor, various wirings (including connectors, etc.), and the like. The smoothing capacitor CM may be in the form of a module formed by molding a plurality of capacitor elements and terminals with resin.

[0030] The busbar structure 70 is a wiring section that electrically connects the rotating electric machine 1 and the power module PM. The busbar structure 70 includes, for each phase of the rotating electric machine 1, a first terminal portion 71 connected to a power line (not shown) of the rotating electric machine 1, a second terminal portion 72 electrically connected to the power module PM, and a busbar 73 extending between the first terminal portion 71 and the second terminal portion 72. A current sensor 889 is provided on the busbar 73. The current sensor 889 is provided for each phase, and generates an electric signal according to the magnitude of the current flowing through the busbar 73. The current sensor 889 may be integrated with the busbar 73 by resin molding or the like.

[0031] 3, a first direction X corresponding to the vehicle longitudinal direction and a second direction Y corresponding to the vehicle lateral direction are defined. One side of the first direction X is a first direction first side X1, the other side of the first direction X (the side opposite to the first direction first side X1 in the first direction X) is a first direction second side X2, one side of the second direction Y is a second direction first side Y1, and the other side of the second direction Y (the side opposite to the second direction first side Y1 in the second direction Y) is a second direction second side Y2. The first direction first side X1 may be, for example, the front side of the vehicle.

[0032] In this embodiment, the inverter case portion 24 is disposed in a manner overlapping the first axis C1 and the second axis C2 in a top view (a view seen in the second direction Y, the same applies below).

[0033] The inverter accommodating chamber S4 defined by the inverter case portion 24 includes a first accommodating portion S41, a second accommodating portion S42, and a third accommodating portion S43.

[0034] The inverter accommodating chamber S4 has an L-shape in top view as shown in Fig. 3. Specifically, when the X-direction center is between the first axis C1 and the second axis C2 in the X-direction, the inverter accommodating chamber S4 extends on both sides of the X-direction center in a manner straddling the X-direction center. When the A-direction center is between the rotating electric machine 1 and the reduction mechanism 34 in the A-direction, the inverter accommodating chamber S4 extends on both sides of the A-direction center in a manner straddling the A-direction center on the first direction second side X2. On the other hand, the inverter accommodating chamber S4 extends only to the axial second side A2 from the A-direction center on the first direction first side X1.

[0035] More specifically, the first housing portion S41, the second housing portion S42, and the third housing portion S43 are arranged in an L-shape as a whole in a top view, as shown in Fig. 3. In this case, the first housing portion S41 overlaps the first axis C1 (i.e., the reduction mechanism 34) on the second axial side A2 in a top view, and overlaps the rotating electric machine 1 in a top view in the axial direction A. The second housing portion S42 overlaps the second axis C2 in a top view, and overlaps the rotating electric machine 1 in a top view in the first direction X. The third housing portion S43 is adjacent to the first housing portion S41 and the second housing portion S42, and overlaps the second axis C2 in a top view. The third housing portion S43 may be integrally connected to the first housing portion S41 and the second housing portion S42.

[0036] In this embodiment, among the components of the inverter device 90, the busbar structure 70 is disposed in the first housing portion S41, the smoothing capacitor CM is disposed in the second housing portion S42, and the power module PM is disposed in the third housing portion S43. In this case, the busbar structure 70 and the power module PM are adjacent to each other in the first direction X, and the power module PM and the smoothing capacitor CM are adjacent to each other in the axial direction A. Note that the boundaries between the first housing portion S41, the second housing portion S42, and the third housing portion S43 do not need to be strict, and for example, a part of the axial first side A1 of the power module PM may be disposed in the second housing portion S42, or a part of the first direction first side X1 of the power module PM may be disposed in the first housing portion S41.

[0037] Next, the characteristic configuration of this embodiment will be described mainly with reference to FIG.

[0038] Fig. 4 is an explanatory diagram of the arrangement of ventilation holes 180 in this embodiment, and is a top view in which the components in the inverter accommodating chamber S4 in the diagram shown in Fig. 3 are omitted. Fig. 5 is a cross-sectional view of a main part of the vehicle drive device passing through ventilation hole 180 in this embodiment, and is a cross-sectional view along a plane (XZ plane) passing through ventilation hole 180. In Fig. 5, the Z direction corresponds to the up-down direction, the Z1 side corresponds to the upper side, and the Z2 side corresponds to the lower side.

[0039] In this embodiment, a cooling structure is provided that cools the power module PM and the like by air cooling without using cooling water.

[0040] Specifically, the case 2 has ventilation holes 180 below the power module PM. The ventilation holes 180 have an inlet 181 that opens forward in the vehicle longitudinal direction, and an outlet 182 that opens rearward, behind the inlet 181. In this case, when the vehicle is traveling, the traveling wind can be taken in from the inlet 181 into the ventilation holes 180, and the taken-in air can be made to flow toward the rear of the vehicle toward the outlet 182. Then, the air can be discharged from the outlet 182 toward the rear of the vehicle. This maximizes the flow rate of air flowing through the ventilation holes 180 when the vehicle is traveling, and effectively improves the cooling performance.

[0041] The ventilation hole 180 may form a ventilation passage extending linearly. For example, at least one straight line may be formed from a point within the opening region of the inlet 181 to a point within the opening region of the outlet 182, without hitting the wall of the ventilation hole 180. This can reduce the resistance (pressure loss, etc.) of the flow path, and effectively improve the cooling performance.

[0042] The cross-sectional shape of the ventilation hole 180 is arbitrary, but may change according to the position along the X direction in a manner that changes the cross-sectional area. For example, the width L4 in the A direction of the ventilation hole 180 as shown in FIG. 4 is constant in the example shown in FIG. 4, but may change according to the position along the X direction. From the same viewpoint, the area of ​​the opening region of the inlet 181 and the area of ​​the opening region of the outlet 182 may be the same or different. For example, the area of ​​the opening region of the inlet 181 may be relatively large to make it easier to take in air into the ventilation hole 180.

[0043] 5, the case 2 preferably has a partition wall 29 between the inverter accommodating chamber S4 and the ventilation holes 180. That is, the inverter accommodating chamber S4 and the ventilation holes 180 are adjacent to each other only via the partition wall 29, which is a part of the case 2. The partition wall 29 may be made of a material having high thermal conductivity (e.g., aluminum) like the material of the case 2. This allows heat inside the inverter accommodating chamber S4 to be efficiently released to the outside via air passing through the ventilation holes 180.

[0044] In particular, when the power module PM is thermally connected to the upper surface of the partition portion 29 (for example, when it is in contact with the partition portion 29 directly or via a thermally conductive sheet), the heat of the power module PM, which generates a relatively large amount of heat, can be efficiently released to the outside via the air passing through the ventilation hole 180.

[0045] Fins or the like may be formed on the surface of partition 29 facing ventilation holes 180. In this case, the surface area of ​​partition 29 facing ventilation holes 180 can be efficiently increased, and heat dissipation can be improved.

[0046] In this embodiment, the ventilation hole 180 is disposed closer to the second axial side A2 than the rotating electric machine 1. That is, the ventilation hole 180 overlaps only with the differential gear mechanism 5 and the reduction mechanism 34 among the rotating electric machine 1, the differential gear mechanism 5, and the reduction mechanism 34 in a top view. Note that, as shown in FIG. 5, the ventilation hole 180 does not communicate with the transmission mechanism accommodating chamber S2 that accommodates the differential gear mechanism 5 and the reduction mechanism 34. However, in a modified example, a breather opening that opens the motor accommodating chamber S1 and / or the transmission mechanism accommodating chamber S2 formed by the case 2 of the vehicle drive device 100 to atmospheric pressure may be provided in the ventilation hole 180.

[0047] The ventilation holes 180 arranged in this manner pass below only the power module PM and the bus bar structure 70 out of the power module PM, the smoothing capacitor CM, and the bus bar structure 70 of the inverter device 90 in a top view.

[0048] In this embodiment, the rotating electric machine 1 has the largest radial size among the rotating electric machine 1, the differential gear mechanism 5, and the reduction mechanism 34. The inverter device 90 (inverter accommodating chamber S4) is disposed so as to avoid an area overlapping with the rotating electric machine 1 in a top view. This allows the inverter accommodating chamber S4 and the ventilation holes 180 to be formed without significantly increasing the vertical size of the vehicle drive device 100.

[0049] As described above, according to this embodiment, the vehicle drive device 100 can be effectively cooled by the ventilation holes 180 without providing a cooling water passage. This eliminates the need to arrange cooling hoses connected to the cooling water passage, and increases the degree of freedom in arranging the vehicle drive device 100.

[0050] In this embodiment, as shown in FIG. 3, the ventilation hole 180 extends linearly in the X direction in top view, but is not limited to this as long as the inlet 181 opens to the front of the vehicle. For example, as shown in FIG. 6, the ventilation hole 180A may be L-shaped in top view. That is, the ventilation hole 180A may be formed by combining a linear portion 184A along the X direction from the inlet 181 and a linear portion 185A along the axial direction A. In this case, the portion 184A and the portion 185A do not need to be perpendicular to each other in top view, and may form an angle significantly smaller than 90 degrees, or may be connected via a curved portion (a portion with an angle R in top view). Even with such a modified example, the running wind can be taken into the ventilation hole 180A from the inlet 181 when the vehicle is running, and the taken-in air can be made to flow toward the exhaust port 182A. Then, the air can be discharged from the exhaust port 182A to the side of the vehicle and flow toward the rear of the vehicle. Even in such a modified example, the ventilation hole 180A overlaps with the power module PM in a top view, so that the power module PM can be efficiently cooled in the same manner as in the above-described embodiment.

[0051] In Fig. 6, the ventilation hole 180A has an exhaust port 182A that opens to the side, but the ventilation hole 180A may have an exhaust port that opens in a diagonal direction to the side and rear. In other words, the exhaust port opening to the side or rear is not necessarily limited to an opening that faces directly to the side or rear, but it is sufficient that the vector (vector in top view) indicating the direction of the exhaust port has a component that faces to the side or rear. The same is true for the inlet 181. In other words, the inlet 181 opening to the front of the vehicle is sufficient that the vector (vector in top view) indicating the direction of the inlet 181 has a component that faces forward.

[0052] Although each embodiment has been described above in detail, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. In addition, it is also possible to combine all or a plurality of the components of the above-described embodiments. [Explanation of symbols]

[0053] DESCRIPTION OF SYMBOLS 1... rotating electric machine, 2... case, 29... partition wall, 180, 180A... ventilation holes, 181... inlet, 182, 182A... outlet, 5... differential gear mechanism (differential transmission device), 6... output member, 34... reduction mechanism (power transmission device), 70... bus bar structure (wiring section), PM... power module, CM... smoothing capacitor, S4... inverter housing (housing), C1... first shaft, C2... second shaft

Claims

1. A rotating electric machine; a power module having a power semiconductor element and converting power to be supplied to the rotating electric machine; a case that houses the rotating electric machine and a power module, the case has a ventilation hole on a lower side of the power module, The vehicle drive device, wherein the ventilation hole has an inlet opening forward in the vehicle longitudinal direction, and has an exhaust outlet opening rearward or laterally behind the inlet.

2. The vehicle drive device according to claim 1 , wherein the case has a partition between an accommodation chamber that accommodates the power module and the ventilation hole.

3. a smoothing capacitor electrically connected between the power module and a power source; a wiring portion that electrically connects the rotating electric machine and the power module, the case further accommodates the power module, the smoothing capacitor, and the wiring portion in a common accommodation chamber; The vehicle drive device according to claim 1 , wherein the ventilation hole passes under only the power module and the wiring portion among the power module, the smoothing capacitor, and the wiring portion.

4. The rotating electric machine is disposed on a first axis, a differential transmission device disposed on a second axis parallel to the first axis and drivingly connected to wheels; a power transmission device disposed on the first shaft and drivingly connected between the differential transmission device and the rotating electric machine, the case further accommodates the differential transmission device and the power transmission device, 4. The vehicle drive device according to claim 1, wherein, when viewed in the vertical direction, the ventilation hole overlaps only with the differential transmission device and the power transmission device among the rotating electric machine, the differential transmission device, and the power transmission device, and when viewed in the axial direction, the ventilation hole overlaps with the rotating electric machine.

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