Vehicle drive unit

Abstract

To provide a drive unit for a vehicle that enables reduced size and manufacturing cost.SOLUTION: A case (1) comprises: a case body (11) defining a first accommodation chamber (5) for accommodating a rotary electric machine (MG) and a gear (G), and a second accommodation chamber (3) for accommodating an inverter device (INV); and a cover member (12). The cover member (12) is joined to the case body (11) on an axial second side (L2) and placed so as to cover the axial second side (L2) of the first accommodation chamber (5). The case body (11) comprises a partitioning wall part (70) separating the first accommodation chamber (5) and the second accommodation chamber (3), a peripheral wall part (61) covering an outside of the first accommodation chamber (5) in a radial direction (R), and an axial wall part (62) covering an axial first side (L1) of the second accommodation chamber (5). The partitioning wall part (70), the peripheral wall part (61) and the axial wall part (62) are integrally formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle drive system including a rotating electric machine, a plurality of gears, a differential gear mechanism, an inverter device, and a case. [Background technology]

[0002] JP 2017-229174 A discloses, as an example of such a vehicle drive device, an electromechanical integrated unit (1) including a rotating electric machine (3), a reduction gear (11), and an inverter device (4) (reference numerals in parentheses in the Background Art are those of the referenced document). The reduction gear (11) is a transmission mechanism that transmits the driving force of the rotating electric machine (3) to wheels. The rotating electric machine (3) and the inverter device (4) are housed in a common housing (2) integrally having a rotating electric machine housing portion (21) and an inverter housing portion (22), and the reduction gear (11) is housed in a reduction gear housing (11a) separate from the common housing (2). The inverter device (4) is housed in the inverter housing portion (22) disposed above the rotating electric machine housing portion (21) that houses the rotating electric machine (3). The common housing (2) is joined to the reducer housing (11a) on one side in the axial direction (X direction) and to the end plate (10) on the other side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-229174 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described electromechanical integrated unit, the axial size of the inverter housing is limited by the mating surfaces between the common housing and the reducer housing, and the mating surfaces between the common housing and the end plates. In other words, the layout of the accommodation chamber that houses the inverter depends on the dividing surfaces of the case of the vehicle drive device. Furthermore, because the mating surfaces of the case are on both sides in the axial direction, an increased number of fastening members for securing the case and sealing members for sealing the case are required, potentially resulting in an increase in the size and cost of the vehicle drive device.

[0005] In view of the above, it is desirable to realize a technology that enables the miniaturization and reduction of manufacturing costs of a vehicle drive device. [Means for solving the problem]

[0006] In view of the above, a vehicle drive device includes a rotating electric machine, a plurality of gears provided in a power transmission path from the rotating electric machine, a differential gear mechanism that distributes a driving force transmitted from the rotating electric machine via the plurality of gears to a plurality of wheels, an inverter device that drives and controls the rotating electric machine, and a case, wherein the case has an axial direction along a rotation axis of the rotating electric machine, and the case has a case main body that forms a first housing chamber that houses the rotating electric machine and the plurality of gears and a second housing chamber that houses the inverter device, and a cover that is joined to the case main body in the axial direction and closes the first housing chamber. a cover member, wherein the side in the axial direction where the rotating electric machine is arranged relative to the plurality of gears is defined as an axial first side, and the opposite side is defined as an axial second side, and the cover member is joined to the axial second side of the case body and is arranged to cover the axial second side of the first accommodating chamber, and the case body includes a partition wall portion that separates the first accommodating chamber and the second accommodating chamber, a peripheral wall portion that covers the radial outside of the first accommodating chamber, and an axial wall portion that covers the axial first side of the first accommodating chamber, and the partition wall portion, the peripheral wall portion, and the axial wall portion are integrally formed.

[0007] With this configuration, the joint surface between the case body and the cover member is only on one side in the axial direction, making it easier to form the second housing chamber wider in the axial direction. This makes it easier to ensure a wide axial arrangement area for the inverter device. As a result, the second housing chamber is prevented from expanding in a direction perpendicular to the axial direction (for example, the vertical direction), and the vehicle drive device is prevented from becoming larger. Furthermore, because the case body that forms the first housing chamber and the second housing chamber is integrally formed, and the first housing chamber can be formed by the case body and the cover member, the number of parts that make up the case can be kept small. In other words, with this configuration, it is possible to reduce the size and manufacturing costs of the vehicle drive device.

[0008] Further features and advantages will become apparent from the following description of exemplary, non-limiting embodiments which are set forth with reference to the drawings. [Brief explanation of the drawings]

[0009] [Figure 1] axial cross-sectional view of a vehicle drive device [Figure 2] axial view of a vehicle drive device [Figure 3] Skeleton diagram of a vehicle drive system [Figure 4] Schematic circuit block diagram of an electrical system that drives a rotating electric machine DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, a vehicle drive system 100 includes a rotating electric machine MG arranged on a first axis A1, an output member OUT arranged on a second axis A2 parallel to the first axis A1 and drivingly connected to wheels W, a plurality of gears G provided in a power transmission path from the rotating electric machine MG to which driving force from the rotating electric machine MG is transmitted, and a differential gear mechanism DF that distributes driving force transmitted from the rotating electric machine MG via the plurality of gears G to the wheels. Note that the output member OUT is omitted in the cross-sectional view of FIG. 1. The plurality of gears G also includes gears constituting a counter gear mechanism CG. The counter gear mechanism CG is also arranged on a third axis A3 parallel to the first axis A1 and the second axis A2. In the vehicle drive system 100, a power transmission path connecting the rotating electric machine MG as a power generating device to the wheels W includes, in order from the rotating electric machine MG side, a plurality of gears G including the counter gear mechanism CG and a differential gear mechanism DF.

[0011] As described above, the axis (first axis A1) of the rotating electric machine MG and the axis (second axis A2) of the output member OUT are arranged on different axes parallel to each other. The axis of the differential gear mechanism DF is also the second axis A2. The axis (third axis A3) of the counter gear mechanism CG is arranged parallel to the first axis A1 and the second axis A2. In other words, the first axis A1, the second axis A2, and the third axis A3 are different virtual axes arranged parallel to each other.

[0012] In the following description, the direction parallel to the first axis A1 is referred to as the axial direction L. Since the first axis A1 and the second axis A2 are parallel to each other, the axial direction L is also parallel to the second axis A2. Furthermore, since the third axis A3 is also parallel to the first axis A1 and the second axis A2, the axial direction L is also parallel to the third axis A3. One side of the axial direction L (in this embodiment, the side where the rotating electric machine MG is arranged relative to the multiple gears G) is referred to as the "axial first side L1," and the opposite side is referred to as the "axial second side L2."

[0013] Furthermore, a direction perpendicular to each of the first axis A1, the second axis A2, and the third axis A3 is referred to as a "radial direction R" based on each axis. When it is not necessary to distinguish which axis is used as a reference or when it is clear which axis is used as a reference, the direction may simply be referred to as a "radial direction R." Furthermore, a direction along the vertical direction when the vehicle drive device 100 is attached to a vehicle is referred to as an "up-down direction V." Furthermore, in this embodiment, one side of the up-down direction V, that is, a first up-down side V1, is the upper side, and the other side, that is, a second up-down side V2, is the lower side. When the vehicle drive device 100 is attached to a vehicle in a state parallel to a horizontal plane, one direction of the radial direction R and the up-down direction V coincide.

[0014] Furthermore, a direction perpendicular to the axial direction L and the up-down direction V is referred to as the "width direction H." One side of the width direction H is referred to as the first width direction side H1, and the other side is referred to as the second width direction side H2. As with the up-down direction V, one direction of the radial direction R coincides with the width direction H. In the following description, terms relating to the direction, position, etc. of each member are concepts that include differences due to tolerances that may be tolerated in manufacturing. Furthermore, the directions of each member represent the directions when the member is assembled to the vehicle drive device 100. In this embodiment, the width direction H corresponds to the front-rear direction of the vehicle when the vehicle drive device 100 is attached to the vehicle. Note that FIG. 2 shows a cross section of the mating surface between the case main body 11 and the cover member 12 and the fastening portion 54 as viewed from the second axial direction side L2 (the case main body 11, the cover member 12, and the fastening portion 54 will be described later).

[0015] The vehicle drive device 100 includes an inverter unit INV that drives and controls a rotating electric machine MG, and a case 1 that houses the rotating electric machine MG, multiple gears G, a differential gear mechanism DF, and the inverter unit INV (see FIGS. 1 and 2). The case 1 includes a case main body 11 that forms an equipment housing chamber 5 (first housing chamber) that houses the rotating electric machine MG and the multiple gears G, and an inverter housing chamber 3 (second housing chamber) that houses the inverter unit INV. The case 1 also includes a cover member 12 that is joined to the case main body 11 in the axial direction L and closes the equipment housing chamber 5, and a partition member 13 that is disposed inside the equipment housing chamber 5 and fixed to the case main body 11. The equipment housing chamber 5 also houses the differential gear mechanism DF and a portion of the output member OUT. The equipment housing chamber 5 and the inverter housing chamber 3 are partitioned by a partition wall portion 70, which will be described later, and the equipment housing chamber 5 is formed as a space surrounded by the cover member 12 and the partition wall portion 70 of the case main body 11. The case body 11 includes a partition wall 70 that separates the equipment accommodating chamber 5 from the inverter accommodating chamber 3, a peripheral wall 61 that covers the outside of the equipment accommodating chamber 5 in the radial direction R, and an axial wall 62 that covers a first axial side L1 of the equipment accommodating chamber 5, and the partition wall 70, the peripheral wall 61, and the axial wall 62 are integrally formed. Here, "integrally formed" refers to an integral member formed from a common material, for example, as a single die casting.

[0016] The inverter accommodating chamber 3 is formed as a space surrounded by a side wall 7 standing upright from the partition wall 70 along the vertical direction V, a lid member 79 joined to an end of the side wall 7 on the first vertical side V1, and the partition wall 70 of the case body 11. The partition wall 70 separates the equipment accommodating chamber 5 and the inverter accommodating chamber 3 in the vertical direction V.

[0017] The rotating electric machine MG is a rotating electric machine (motor / generator) that operates on multi-phase AC (for example, three-phase AC) and can function as both an electric motor and a generator. As shown in Fig. 4, the rotating electric machine MG receives power from a high-voltage battery BH (high-voltage DC power supply) for power running, or generates power using the inertial force of the vehicle and supplies it to the high-voltage battery BH (regenerates power).

[0018] The rotating electric machine MG has a stator 81 fixed to the case 1 or the like, and a rotor 82 rotatably supported radially inside the stator 81. The stator 81 includes a stator core 81c and a stator coil 83 wound around the stator core 81c, and the rotor 82 includes a rotor core and a permanent magnet arranged on the rotor core. The rotor 82 of the rotating electric machine MG is drivingly connected to an input gear G1. The input gear G1 is one of multiple gears G that transmit driving force from the rotating electric machine MG to the differential gear mechanism DF, and corresponds to a first gear connected to the rotor 82 of the rotating electric machine MG so as to rotate integrally with the rotor 82. The input gear G1 is also drivingly connected to a counter gear mechanism CG. More specifically, the input gear G1 meshes with a counter driven gear G2 (third gear) of the counter gear mechanism CG.

[0019] 1 to 3, the counter gear mechanism CG is disposed on a third axis A3 parallel to the first axis A1 and the second axis A2, and drivingly connects the rotating electric machine MG and the differential gear mechanism DF via an input gear G1. In this embodiment, the third axis A3 on which the counter gear mechanism CG is disposed is disposed below in the vertical direction V (on a second vertical side V2) an imaginary plane connecting the first axis A1 and the second axis A2 (see FIG. 2).

[0020] The counter gear mechanism CG has two gears (counter driven gear G2 and counter drive gear G3) connected by a shaft member. That is, the counter gear mechanism CG is arranged on the third shaft A3 and includes a counter driven gear G2 (third gear) that meshes with the input gear G1 (first gear), and a counter drive gear G3 (fourth gear) that rotates integrally with the counter driven gear G2 and meshes with a differential input gear G4 (second gear) that will be described later. In this embodiment, the counter drive gear G3 (fourth gear) is arranged closer to the rotating electric machine MG than the counter driven gear G2 (third gear) in the axial direction L.

[0021] Note that this does not preclude a configuration in which the counter driven gear G2 (third gear) is disposed closer to the rotating electric machine MG than the counter drive gear G3 (fourth gear) in the axial direction L. Furthermore, this does not preclude a configuration in which the third axis A3 on which the counter gear mechanism CG is disposed is disposed above in the vertical direction V (on the first vertical side V1) an imaginary plane connecting the first axis A1 and the second axis A2.

[0022] The differential gear mechanism DF is drivingly connected to the wheels W via an output member OUT. The differential gear mechanism DF includes a plurality of bevel gears that mesh with each other, and distributes and transmits rotation and torque input to a differential input gear G4 (second gear) to a pair of output members OUT (i.e., a pair of wheels W) via a first side gear S1 and a second side gear S2. The differential input gear G4, which is connected to rotate integrally with the differential gear mechanism DF, is one of a plurality of gears G that transmit driving force from the rotating electric machine MG to the differential gear mechanism DF, and is connected to the differential gear mechanism DF to transmit driving force from the rotating electric machine MG to the differential gear mechanism DF. The differential gear mechanism DF distributes the driving force of the rotating electric machine MG, transmitted via the differential input gear G4, to two output members OUT. In this way, the vehicle drive device 100 can transmit the torque of the rotating electric machine MG to the wheels W to run the vehicle. Naturally, the first side gear S1 and the second side gear S2 are included in the differential gear mechanism DF, but are not included in the output member OUT.

[0023] As described above, the partitioning member 13, which is configured as a separate member, is fixed to the case body 11 so as to separate the equipment accommodating chamber 5. By including the partitioning member 13, the rotating electric machine accommodating chamber 2 and the gear accommodating chamber 4 can be appropriately formed in the integrally formed case body 11. Compared to a configuration including a case member in which the rotating electric machine accommodating chamber 2 is formed and a case member in which the gear accommodating chamber 4 is formed, the number of parts of the case 1 can be reduced. The partitioning member 13 also functions as a support member that supports the rotating electric machine MG, the input member IN, and the counter gear mechanism CG.

[0024] As shown in FIG. 1 , the rotor shaft 82a of the rotary electric machine MG is rotatably supported by bearings B on both the first axial side L1 and the second axial side L2. The bearing B on the first axial side L1 is supported by the case body 11, and the bearing B on the second axial side L2 is supported by the partition member 13. The input member IN connected to the rotor shaft 82a is supported by the partition member 13 via the bearing B on the first axial side L1, and is supported by the cover member 12 via the bearing B on the second axial side L2. The counter gear mechanism CG is similarly supported by the partition member 13 via the bearing B on the first axial side L1, and is supported by the cover member 12 via the bearing B on the second axial side L2. In this way, the partition member 13 functions as a support member, eliminating the need to provide a separate space for installing a support member within the equipment housing chamber 5, thereby preventing the vehicle drive device 100 from becoming larger.

[0025] As shown in FIG. 4, the rotating electric machine MG is driven and controlled by an inverter unit INV. This inverter unit INV is also housed in the case 1 (case body 11). The inverter unit INV includes an inverter circuit 60 that converts power between DC power and multi-phase AC power. The inverter circuit 60 is connected to the AC rotating electric machine MG and a high-voltage battery BH, and converts power between multi-phase (here, three phases: U, V, and W) AC and DC. The high-voltage battery BH is configured, for example, with a secondary battery (battery) such as a nickel-metal hydride battery or a lithium-ion battery, or an electric double-layer capacitor. When the rotating electric machine MG is a driving power source for a vehicle, the high-voltage battery BH is a high-voltage, large-capacity DC power supply, with a rated power supply voltage of, for example, 200 to 400 V. The inverter circuit 60 includes a DC link capacitor 64 (smoothing capacitor) that smoothes the voltage (DC link voltage) between the DC positive power supply line P and the DC negative power supply line N. The DC link capacitor 64 stabilizes the DC link voltage that fluctuates in accordance with fluctuations in the power consumption of the rotary electric machine MG.

[0026] The inverter circuit 60 includes a plurality of switching elements. Specifically, the inverter circuit 60 includes a plurality of (here, three) arms for one AC phase, each of which is formed by a series circuit of an upper-stage switching element and a lower-stage switching element. The switching elements may be power semiconductor elements capable of operating at high frequencies, such as an IGBT (Insulated Gate Bipolar Transistor), a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor), a SiC-MOSFET (Silicon Carbide-Metal Oxide Semiconductor FET), a SiC-SIT (SiC-Static Induction Transistor), or a GaN-MOSFET (Gallium Nitride-MOSFET). As shown in FIG. 4 , this embodiment illustrates an example in which an IGBT is used as the switching element. In this embodiment, the inverter circuit 60, including a freewheel diode, is integrated into a single power module to form a switching element module.

[0027] As shown in FIG. 4, the inverter circuit 60 is controlled by an inverter control device 65 (M-CTRL). The inverter control device 65 is constructed with a logic circuit such as a microcomputer as its core component. The inverter control device 65 performs current feedback control using a known vector control method based on the target torque of the rotating electric machine MG, thereby controlling the rotating electric machine MG via the inverter circuit 60. The target torque of the rotating electric machine MG is provided as a request signal from another control device, for example, a vehicle control device 91 (VCL-CTRL), which is one of the higher-level control devices in the vehicle. The actual current flowing through the stator coil 83 of each phase of the rotating electric machine MG is detected by a current sensor 84. Furthermore, the magnetic pole position of the rotor of the rotating electric machine MG at each point in time is detected by a rotation sensor 85, for example, a resolver.

[0028] The inverter control device 65 performs current feedback control using the detection results of the current sensor 84 and the rotation sensor 85. The inverter control device 65 is configured to have various functional units for current feedback control, and each functional unit is realized by cooperation between hardware such as a microcomputer and software (programs).

[0029] The vehicle control device 91 and the inverter control device 65 are low-voltage circuits that operate by receiving power from a low-voltage battery BL (low-voltage DC power supply), which is a power supply with a lower voltage (for example, 12 to 24 V) than the high-voltage battery BH. For this reason, the inverter control device 65 is provided with drive circuits that increase and relay the drive capabilities (for example, voltage amplitude, output current, and other capabilities for operating downstream circuits) of switching control signals (gate drive signals in the case of IGBTs) for each switching element. The inverter control device 65 is configured by mounting the above-mentioned microcomputer, its peripheral circuits, and circuit components that make up the drive circuits on one or more boards.

[0030] The inverter unit INV is configured as a unit including the inverter control device 65, DC link capacitor 64, and inverter circuit 60 (power module) as described above. The inverter unit INV as a unit is placed in the inverter accommodating chamber 3 (second accommodating chamber) and fixed to the case 1 with fastening members such as bolts. In this specification, the phrase "overlapping with the inverter unit INV" refers to a state in which there is overlap with one or more of the components of the inverter unit INV.

[0031] As described above, the vehicle drive device 100 of this embodiment includes a rotating electric machine MG, a plurality of gears G provided in a power transmission path from the rotating electric machine MG, a differential gear mechanism DF that distributes driving force transmitted from the rotating electric machine MG via the plurality of gears G to a plurality of wheels W, an inverter unit INV that drives and controls the rotating electric machine MG, and a case 1. The case 1 includes a case main body 11 integrally formed to form an equipment accommodating chamber 5 (first accommodating chamber) that accommodates the rotating electric machine MG and the plurality of gears G and an inverter accommodating chamber 3 (second accommodating chamber) that accommodates the inverter unit INV, a cover member 12 that is joined to the case main body 11 in the axial direction L and closes the equipment accommodating chamber 5, and a partition member 13 that is disposed inside the equipment accommodating chamber 5 and fixed to the case main body 11. The partition member 13 partitions the equipment accommodating chamber 5 in the axial direction L to form a rotating electric machine accommodating chamber 2 that accommodates the rotating electric machine MG and a gear accommodating chamber 4 that accommodates the plurality of gears G. As shown in Fig. 2, the partition member 13 extends in the width direction H. The partition member 13 is a separate member from the case body 11, and is fixed to the case body 11 by a partition member fastening member 18. As shown in Fig. 2, the partition member 13 extends in the width direction H. In other words, the partition member 13 is formed in a plate shape extending along the radial direction R.

[0032] The cover member 12 is joined to the case body 11 on the second axial side L2 and is disposed so as to cover the second axial side L2 of the gear accommodating chamber 4. The cover member 12 is joined to the case body 11 at a joint surface 9 and fixed to the case body 11 by a cover member fastening member 17. The case body 11 includes a peripheral wall portion 61 that covers the outer side of the rotating electric machine accommodating chamber 2 in the radial direction R and an axial wall portion 62 that covers the first axial side L1 of the rotating electric machine accommodating chamber 2, and the peripheral wall portion 61 and the axial wall portion 62 are integrally formed. In the case body 11, an end portion on the first axial side L1 of a partition wall portion 70 that partitions the equipment accommodating chamber 5 and the inverter accommodating chamber 3 (partition wall portion axial first-side end portion 70t) is disposed closer to the first axial side L1 than an end portion on the first axial side L1 of the rotating electric machine MG (rotating electric machine axial first-side end portion MGt). The rotary electric machine axial first side end portion MGt is an end portion on the axial first side L1 of the coil end portion of the stator coil 83 of the rotary electric machine MG.

[0033] Because the joint surface 9 between the case body 11 and the cover member 12 is only on one side in the axial direction L, it is easy to form the inverter accommodating chamber 3 wide in the axial direction L. This makes it easy to ensure a wide arrangement area for the inverter unit INV in the axial direction L. As a result, it is possible to prevent the inverter accommodating chamber 3 from being widened in a direction perpendicular to the axial direction L (for example, the up-down direction V), and to prevent the vehicle drive device 100 from becoming large. Furthermore, because the case body 11 is integrally formed to form the equipment accommodating chamber 5 and the inverter accommodating chamber 3, and the equipment accommodating chamber 5 can be formed by the case body 11 and the cover member 12, the number of parts constituting the case 1 can be kept small.

[0034] The rotating electric machine accommodating chamber 2 and the gear accommodating chamber 4 are not strictly separated by the partition member 13, and the two accommodating chambers are partially in communication with each other. The rotating electric machine MG is disposed on a first axial side L1 of the partition member 13 to form the rotating electric machine accommodating chamber 2, and multiple gears G are disposed on a second axial side L2 of the partition member 13 to form the gear accommodating chamber 4.

[0035] As described above, the equipment accommodating chamber 5 has the rotating electric machine accommodating chamber 2 that accommodates the rotating electric machine MG, and the gear accommodating chamber 4 that accommodates a plurality of gears G. The case 1 is provided with the partition member 13 that is disposed between the rotating electric machine accommodating chamber 2 and the gear accommodating chamber 4 in the axial direction L and is fixed to the case main body 11. The partition member 13 appropriately defines a plurality of accommodating chambers in the integrally formed case main body 11.

[0036] Furthermore, the rotor 82 of the rotary electric machine MG is supported by the axial wall portion 62 and the partition member 13. That is, the rotor 82 is supported on the first axial side L1 by the axial wall portion 62, which functions as a support wall, and on the second axial side L2 by the partition member 13, which also functions as a support wall. In this way, the rotor 82 is appropriately supported by the solid support wall that constitutes the case 1.

[0037] As described above, the end portion of the partition wall portion 70 on the first axial side L1 (the partition wall portion axial first side end portion 70t) is disposed on the axial first side of the end portion of the stator 81 on the axial side L1 of the rotating electrical machine MG (the end portion of the stator core 81c or the end portion of the coil end portion of the stator coil 83). Similarly, the end portion of the partition wall portion 70 on the first axial side L1 (the partition wall portion axial first side end portion 70t) is disposed on the axial first side of the end portion of the rotor 82 on the axial side L1 of the rotor 82 of the rotating electrical machine MG (the end portion of the rotor core). That is, the inverter accommodating chamber 3 can be formed wide in the axial direction L, making it easier to ensure an arrangement area for the inverter unit INV in the axial direction L.

[0038] The arrangement area of ​​the partition wall portion 70 in the axial direction L is arranged to overlap with the arrangement area of ​​the partition member 13 in the axial direction L. That is, the partition wall portion 70 is formed on both sides in the axial direction L, sandwiching the partition member 13 therebetween. Because the partition wall portions 70 are formed on both sides in the axial direction L, sandwiching the partition member 13 therebetween, it is easy to ensure the rigidity of the equipment accommodating chamber 5, the inverter accommodating chamber 3, and the partition wall portion 70. Note that in this specification, with regard to the arrangement of two members, "arrangement areas overlap in a specific direction" means that there are at least parts of each of the two members that are positioned at the same position in the specific direction.

[0039] Naturally, in cases where the rigidity of the equipment accommodating chamber 5, the inverter accommodating chamber 3, the partition wall portion 70, etc. can be sufficiently ensured, the arrangement area of ​​the partition wall portion 70 in the axial direction L does not have to overlap with the arrangement area of ​​the partition member 13 in the axial direction L.

[0040] Furthermore, the arrangement area of ​​the partition wall portion 70 in the axial direction L is arranged so as to overlap with the arrangement area of ​​at least some of the multiple gears G in the axial direction L. When the partition wall portion 70 is arranged in this manner, the inverter accommodating chamber 3 can be formed over a wide range in the axial direction L. That is, the partition wall portion 70 is also provided above the gear accommodating chamber 4, and therefore the inverter accommodating chamber 3 can be formed with a sufficient area along the axial direction L. Naturally, if a sufficient area of ​​the inverter accommodating chamber 3 can be ensured, the arrangement area of ​​the partition wall portion 70 in the axial direction L does not have to overlap with the arrangement area of ​​the gears G in the axial direction L.

[0041] The inverter circuit 60 and the rotating electric machine MG are electrically connected by electrically connecting an inverter-side bus bar 51 electrically connected to the inverter circuit 60 and a rotating electric machine-side bus bar 53 electrically connected to the stator coil 83 with a connecting member 52 such as a connector. A fastening portion 54 of the connecting member 52 for electrically connecting the rotating electric machine MG and the inverter unit INV is disposed in the equipment accommodating chamber 5. As shown in FIG. 2 , at this fastening portion 54, a bus bar fastening member 55 extending along the axial direction L is used to fasten the terminal on the rotating electric machine MG side (the rotating electric machine-side bus bar 53) and the terminal on the inverter unit INV side (the inverter-side bus bar 51) electrically.

[0042] Here, the partitioning member 13 is arranged so as not to overlap with the fastening portions 54 along the axial direction L. In other words, when the connecting member 52 is fastened at the fastening portions 54, the partitioning member 13 is arranged so as not to overlap with the fastening portions 54 along the axial direction L. That is, the partitioning member 13 is arranged so as not to overlap with the fastening portions 54 when viewed in the axial direction along the axial direction L. In this embodiment, the partitioning member 13 is arranged inside the equipment housing chamber 5. Alternatively, it can be said that the partitioning member 13 is arranged on the outer side of the rotating electric machine MG in the radial direction R. Furthermore, in this embodiment, it can also be said that the partitioning member 13 is arranged on the outer side of the differential gear mechanism DF in the radial direction R. Note that in this specification, with regard to the arrangement of two members, "overlapping when viewed in a specific direction" refers to the presence of a region in which an imaginary line parallel to the line of sight intersects with both of the two members when the imaginary line is moved in each direction perpendicular to the imaginary line.

[0043] In this way, by arranging the partition member 13 so as not to overlap with the fastening portion 54 when viewed in the axial direction, the fastening portion 54 arranged inside the equipment housing chamber 5 can be seen from the opening side (the second axial side L2) of the case body 11, making it easy to check the state of the fastening portion 54. Also, it is easy to perform the work of fastening the connecting member 52 at the fastening portion 54. Even if the opening of the case body 11 is only on one side in the axial direction L, productivity and ease of maintenance are not impaired.

[0044] Note that this does not preclude a configuration in which the partitioning member 13 is disposed overlapping the fastening portion 54 as viewed in the axial direction L. For example, the partitioning member 13 may be provided with an opening (e.g., referred to as a service hole) at a position overlapping the fastening portion 54 as viewed in the axial direction L, so that the fastening operation at the fastening portion 54 can be performed from the second axial side L2 through the opening. Alternatively, the fastening portion 54 may be provided on the first axial side L1, and an opening serving as a service hole may be provided in the axial wall portion 62 of the case body 11, so that the fastening operation at the fastening portion 54 can be performed from the first axial side L1. Note that when such an opening (service hole) is provided, it is preferable to provide a cover member that covers the opening.

[0045] The busbar fastening members 55 are inserted from the second axial side L2 so that their heads are positioned on the second axial side L2 and are oriented to be fastened to the fastening portions 54 of the connecting member 52. As described above, the second axial side L2 of the case body 11 is open. The partitioning member 13, which is positioned closer to the second axial side L2 than the fastening portions 54, does not overlap with the busbar fastening members 55 (fastening portions 54) along the axial direction L. That is, the partitioning member 13 does not overlap with the busbar fastening members 55 (fastening portions 54) when viewed in the axial direction along the axial direction L. Therefore, the inverter unit INV and the rotating electric machine MG can be easily electrically connected from the second axial side L2 by the busbar fastening members 55 before attaching the cover member 12 to the case body 11.

[0046] Moreover, in this embodiment, the terminals of the inverter unit INV (inverter-side bus bars 51) are arranged on a first axial side L1 of the inverter unit INV in the axial direction L, and the terminals (rotating electric machine-side bus bars 53) connected to the stator coil 83 of the rotating electric machine MG are arranged on the first axial side L1 of the rotating electric machine MG in the axial direction L. More specifically, the terminals of the inverter unit INV (inverter-side bus bars 51) are arranged on the first axial side L1 with respect to the stator core 81c of the rotating electric machine MG, and the terminals (rotating electric machine-side bus bars 53) connected to the stator coil 83 of the rotating electric machine MG are arranged on the first axial side L1 with respect to the stator core 81c.

[0047] In this embodiment, both the terminal of the inverter unit INV (inverter-side bus bar 51) and the terminal connected to the stator coil 83 of the rotary electric machine MG (rotating electric machine-side bus bar 53) are arranged on the same side in the axial direction L, in this case, on the first axial side L1, with respect to the stator core 81c. Therefore, the two can be electrically connected with a short wiring distance.

[0048] Naturally, the inverter-side busbar 51 may be disposed on the second axial side L2 with respect to the stator core 81c. In this case, it is preferable that both the inverter-side busbar 51 and the rotating electric-machine-side busbar 53 are disposed on the second axial side L2 with respect to the stator core 81c. However, as in these examples, the inverter-side busbar 51 and the rotating electric-machine-side busbar 53 may be disposed on different sides of the stator core 81c in the axial direction L rather than on the same side. For example, the inverter-side busbar 51 may be disposed on the first axial side L1 with respect to the stator core 81c, and the rotating electric-machine-side busbar 53 may be disposed on the second axial side L2 with respect to the stator core 81c. Alternatively, the inverter-side busbar 51 may be disposed on the second axial side L2 with respect to the stator core 81c, and the rotating electric-machine-side busbar 53 may be disposed on the first axial side L1 with respect to the stator core 81c. Although this increases the wiring distance, such a configuration may be acceptable if an increase in impedance due to the longer wiring distance is acceptable.

[0049] Furthermore, the portion of the case body 11 that forms the inverter accommodating chamber 3 has a protruding portion 19 that protrudes further toward the cover member 12 in the axial direction L than the joint surface 9 between the case body 11 and the cover member 12 and is spaced apart from the joint surface 9 in directions (vertical direction V, radial direction R) perpendicular to the axial direction L. In other words, the protruding portion 19 straddles the joint surface 9 along the axial direction L and overlaps with the joint surface 9 when viewed in the radial direction R.

[0050] In this way, by providing the protruding portion 19 in the case body 11, the inverter accommodating chamber 3 (second accommodating chamber) can be provided up to the second axial side L2 beyond the joint surface 9 between the case body 11 and the cover member 12. This makes it easy to ensure the volume of the inverter accommodating chamber 3. Naturally, if a sufficient size can be ensured for the inverter accommodating chamber 3, the case body 11 does not need to have the protruding portion 19 as described above.

[0051] As described above, the gears G include an input gear G1 serving as a first gear drivingly connected to the rotor 82 of the rotating electric machine MG so as to rotate integrally with the rotor 82, and a differential input gear G4 serving as a second gear connected to the differential gear mechanism DF to transmit driving force from the rotating electric machine MG. The rotating electric machine MG and the input gear G1 are disposed on a first axis A1, and the differential gear mechanism DF and the differential input gear G4 are disposed on a second axis A2 that is parallel to the first axis A1. Furthermore, the counter gear mechanism CG is disposed on a third axis A3 that is parallel to the first axis A1 and the second axis A2. The counter gear mechanism CG includes a counter driven gear G2 serving as a third gear that meshes with the input gear G1, and a counter drive gear G3 serving as a fourth gear that rotates integrally with the counter driven gear G2 and meshes with the differential input gear G4. As shown in Figure 1, the placement area of ​​the partition wall portion 70 in the axial direction L overlaps with the entire placement area of ​​the rotating electric machine MG in the axial direction L, and is positioned so as to overlap with both the placement area of ​​the input gear G1 and the placement area of ​​the differential input gear G4 in the axial direction L.

[0052] In this way, by ensuring a wide arrangement area for the partition wall portion 70 in the axial direction L, the inverter accommodating chamber 3 can be formed over a wide range in the axial direction L. This makes it easier to ensure the capacity of the inverter accommodating chamber 3 in the axial direction L, reducing the need to expand the inverter accommodating chamber 3 in a direction perpendicular to the axial direction L (for example, the up-down direction V). As a result, it is possible to prevent the vehicle drive device 100 from becoming larger in size in the direction perpendicular to the axial direction L.

[0053] The arrangement is not limited to the above embodiment, and the arrangement area of ​​the partition wall portion 70 in the axial direction L may be arranged so as to overlap with a part of the arrangement area of ​​the rotating electric machine MG in the axial direction L, rather than overlapping the entire area. Furthermore, the arrangement area of ​​the partition wall portion 70 in the axial direction L may be arranged so as not to overlap with both the arrangement area of ​​the input gear G1 and the arrangement area of ​​the differential input gear G4 in the axial direction L, but overlapping with only one of them.

[0054] As described above, in this embodiment, the third axis A3 on which the counter gear mechanism CG is disposed is disposed below the imaginary plane connecting the first axis A1 and the second axis A2 in the vertical direction V (on the second vertical side V2). This makes it easier to secure space above the third axis A3 in the vertical direction V (on the first vertical side V1), making it easier to dispose, for example, the connecting member 52 that electrically connects the inverter-side bus bar 51 and the rotating electrical machine-side bus bar 53.

[0055] Furthermore, when the third axis A3 on which the counter gear mechanism CG is arranged is arranged above the imaginary plane connecting the first axis A1 and the second axis A2 in the vertical direction V (first side V1 in the vertical direction), it is preferable to arrange the connecting member 52 outside the radial direction R of the gear with a relatively small diameter (in this case, the counter drive gear G3).

[0056] Other Embodiments Other embodiments will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, and can also be applied in combination with the configurations of other embodiments as long as no contradiction occurs.

[0057] (1) In the above, a three-shaft vehicle drive device 100 has been exemplified, in which the rotating electric machine MG is disposed on the first shaft A1, the differential gear mechanism DF is disposed on the second shaft A2, and the counter gear mechanism CG is disposed on the third shaft A3. However, the vehicle drive device 100 may have a configuration in which the rotating electric machine MG, the differential gear mechanism DF, and the counter gear mechanism CG are disposed coaxially. Furthermore, the vehicle drive device 100 may have a two-shaft configuration in which the first shaft A1 and the second shaft A2 are disposed in parallel. Furthermore, the vehicle drive device 100 may have a configuration in which one or more axes other than the first shaft A1, the second shaft A2, and the third shaft A3 are further disposed in parallel, thereby having four or more axes disposed in parallel.

[0058] (2) In the above, a vehicle drive device 100 for an electric vehicle equipped with a rotating electric machine MG as a driving force source for the wheels W has been described as an example, but the vehicle drive device 100 may also be a hybrid drive device equipped with both an internal combustion engine and a rotating electric machine MG as a driving force source for the wheels W of the vehicle (for example, various types of hybrid drive devices such as a so-called one-motor parallel type or two-motor split type).

[0059] [Overview of the embodiment] The above-described vehicle drive device (100) will now be briefly described.

[0060] In one embodiment, the vehicle drive device (100) includes: Rotating motor (MG) and a plurality of gears (G) provided in a power transmission path from the rotating electric machine (MG); a differential gear mechanism (DF) that distributes driving force transmitted from the rotating electric machine (MG) via the plurality of gears (G) to a plurality of wheels (W); an inverter device (INV) that drives and controls the rotating electric machine (MG); A case (1), The direction along the rotation axis of the rotating electric machine (MG) is defined as an axial direction (L), The case (1) includes a case main body (11) that forms a first housing chamber (5) that houses the rotating electric machine (MG) and the plurality of gears (G) and a second housing chamber (3) that houses the inverter device (INV), and a cover member (12) that is joined to the case main body (11) in the axial direction (L) and closes the first housing chamber (11), In the axial direction (L), a side on which the rotating electric machine (MG) is arranged with respect to the plurality of gears (G) is defined as an axial first side (L1), and an opposite side is defined as an axial second side (L2), the cover member (12) is joined to the case body (11) on the second axial side (L2) and is arranged to cover the second axial side (L2) of the first storage chamber (11), The case body (11) includes a partition wall portion (70) that separates the first storage chamber (5) from the second storage chamber (3), a peripheral wall portion (61) that covers the radial outside of the first storage chamber (5), and an axial wall portion (62) that covers the first axial side (L1) of the first storage chamber (5), and the partition wall portion (70), the peripheral wall portion (61), and the axial wall portion (62) are integrally formed.

[0061] According to this configuration, the joint surface (9) between the case body (11) and the cover member (12) is located only on one side in the axial direction (L), making it easier to form the second housing chamber (3) wide in the axial direction (L). This makes it easier to ensure a wide arrangement area for the inverter device (INV) in the axial direction (L). As a result, the second housing chamber (3) is prevented from expanding in a direction perpendicular to the axial direction (L) (e.g., the vertical direction), thereby preventing the vehicle drive device (100) from becoming large. Furthermore, since the case body (11) that forms the first housing chamber (5) and the second housing chamber (3) is integrally formed, and the first housing chamber (5) can be formed by the case body (11) and the cover member (12), the number of parts constituting the case (1) can be reduced. In other words, according to this configuration, the vehicle drive device (100) can be made smaller and its manufacturing costs can be reduced.

[0062] Furthermore, it is preferable that the first accommodating chamber (5) has a rotating electric machine accommodating chamber (2) that accommodates the rotating electric machine (MG) and a gear accommodating chamber (4) that accommodates the plurality of gears (G), and that the case (1) has a partition member (13) that is arranged between the rotating electric machine accommodating chamber (2) and the gear accommodating chamber (4) in the axial direction (L) and is fixed to the case main body (11).

[0063] The partition member (13) appropriately defines a plurality of storage chambers in the integrally formed case body (11).

[0064] Preferably, the rotary electric machine (MG) includes a rotor (82), and the rotor (82) is supported by the axial wall portion (62) and the partition member (13).

[0065] According to this configuration, the rotor (82) is appropriately supported by the solid support walls (the axial wall portion (62) and the partition member (13)) that constitute the case 1 (1).

[0066] It is also preferable that the rotating electric machine (MG) has a rotor (82), and the end (70t) of the partition wall portion (70) on the first axial side (L1) is positioned closer to the first axial side (L1) than the end of the rotor (82) on the first axial side (L1).

[0067] According to this configuration, the inverter accommodating chamber (3) can be formed wide in the axial direction (L), and it is easy to ensure an area for arranging the inverter device (INV) in the axial direction (L).

[0068] It is also preferable that the rotating electric machine (MG) has a stator (81), and the end (70t) of the partition wall portion (70) on the first axial side (L1) is positioned closer to the first axial side (L1) than the end of the rotor (82) on the first axial side (L1).

[0069] According to this configuration, the inverter accommodating chamber (3) can be formed wide in the axial direction (L), and it is easy to ensure an area for arranging the inverter device (INV) in the axial direction (L).

[0070] It is also preferable that the partition wall portion (70) is disposed so as to overlap the partition member (13) in the axial direction (L).

[0071] That is, the partition wall portions (70) are formed on both sides in the axial direction (L) of the partition member (13) sandwiched therebetween. Since the partition wall portions (70) are formed on both sides in the axial direction (L) of the partition member (13) sandwiched therebetween, it is easy to ensure the rigidity of the first storage chamber (5), the second storage chamber (3), and the partition wall portions (70).

[0072] Furthermore, when the arrangement area of ​​the partition wall portion (70) in the axial direction (L) is arranged so as to overlap with the arrangement area of ​​the partition member (13) in the axial direction (L), it is preferable that the arrangement area of ​​the partition wall portion (70) in the axial direction (L) is further arranged so as to overlap with the arrangement areas of at least some of the multiple gears (G) in the axial direction (L).

[0073] When the partition wall portion (70) is arranged in this manner, the second storage chamber (3) can be formed over a wide range in the axial direction (L). That is, the partition wall portion (70) is also provided above the gear storage chamber (4), and the second storage chamber (3) can be formed with a sufficient area along the axial direction (L). Naturally, if a sufficient area can be ensured for the second storage chamber (3), the arrangement area of ​​the partition wall portion (70) in the axial direction (L) does not need to overlap with the arrangement area of ​​the gear (G) in the axial direction (L).

[0074] a fastening portion (54) of a connecting member (52) for electrically connecting the rotating electric machine (MG) and the inverter device (INV) is disposed in the first housing chamber (5); The partition member (13) is preferably arranged so as not to overlap with the fastening portion (54) when viewed in the axial direction (L).

[0075] In this way, the partition member 13 is arranged so as not to overlap with the fastening portion 54 when viewed in the axial direction. This allows the fastening portion 54, which is arranged in the first storage chamber 5, to be visible from the opening side (the second axial side L2) of the case body 11, making it easy to check the state of the fastening portion 54. Furthermore, the operation of fastening the connecting member 52 at the fastening portion 54 is also easy to perform. Even if the opening of the case body 11 is only on one side in the axial direction L, productivity and ease of maintenance are not impaired.

[0076] Furthermore, it is preferable that the connecting member (52) is fastened by a fastening member (55), and that the fastening member (55) is inserted from the second axial side (L2) and is oriented so that the head of the fastening member (55) is located on the second axial side (L2).

[0077] When the cover member (12), which is arranged to cover the second axial side (L2) of the first housing chamber (5), is not joined to the second axial side (L2) of the case body (11), the second axial side (L2) of the case body (11) is open. The partition member (13), which is arranged closer to the second axial side (L2) than the fastening portion (54), does not overlap with the fastening member (55) (fastening portion 54) along the axial direction (L). That is, the partition member (13) does not overlap with the fastening member (55) (fastening portion 54) as viewed in the axial direction (L). Therefore, before attaching the cover member (12) to the case body (11), the inverter unit (INV) and the rotating electrical machine (MG) can be easily electrically connected from the second axial side (L2) by the fastening member (55).

[0078] It is also preferable that the terminal (51) of the inverter device (INV) is arranged on the first axial side (L1) of the inverter device (INV) in the axial direction (L), and the terminal (53) connected to the stator coil (83) of the rotating electric machine (MG) is arranged on the first axial side (L1) of the rotating electric machine (MG) in the axial direction (L).

[0079] That is, the terminals (51) of the inverter device (INV) and the terminals (53) connected to the stator coil (83) of the rotary electric machine (MG) are both arranged on the same side in the axial direction (L), in this case the first axial side (L1), of the stator core (81c), so that they can be electrically connected with short wiring distances.

[0080] Furthermore, it is preferable that the portion of the case body (11) that forms the second storage chamber (3) has a protruding portion (19) that protrudes toward the cover member (12) in the axial direction (L) beyond the joint surface (9) between the case body (11) and the cover member (12) and is spaced apart from the joint surface (9) in a direction perpendicular to the axial direction (L).

[0081] In this way, since the case body 11 has the protruding portion 19, the second storage chamber 3 can be provided on the second axial side L2 of the joint surface 9 between the case body 11 and the cover member 12. Therefore, it is easy to ensure the volume of the second storage chamber 3.

[0082] The plurality of gears (G) include a first gear (G1) drivingly connected to the rotor (82) of the rotating electric machine (MG) so as to rotate integrally with the rotor (82), and a second gear (G4) connected to the differential gear mechanism (DF) to transmit driving force from the rotating electric machine (MG), the rotating electric machine (MG) and the first gear (G1) are disposed on a first shaft (A1); the differential gear mechanism (DF) and the second gear (G4) are disposed on a second shaft (A2) that is a separate shaft parallel to the first shaft (A1); The rotational speed controller further includes a counter gear mechanism (CG) disposed on a third shaft (A3) parallel to the first shaft (A1) and the second shaft (A2), the counter gear mechanism (CG) including a third gear (G2) meshing with the first gear (G1), and a fourth gear (G3) rotating integrally with the third gear (G2) and meshing with the second gear (G4), It is preferable that the placement area of ​​the partition wall portion (70) in the axial direction (L) overlaps with the entire placement area of ​​the rotating electric machine (MG) in the axial direction (L), and is positioned so as to overlap with both the placement area of ​​the first gear (G1) and the placement area of ​​the second gear (G4) in the axial direction (L).

[0083] In this way, by ensuring a wide arrangement area for the partition wall portion (70) in the axial direction (L), the second storage chamber (3) can be formed over a wide range in the axial direction (L). This makes it easier to ensure the capacity of the second storage chamber (3) in the axial direction (L), thereby reducing the need to expand the second storage chamber (3) in a direction perpendicular to the axial direction (L). As a result, it is possible to prevent the vehicle drive device (100) from becoming larger in size in the direction perpendicular to the axial direction (L). [Explanation of symbols]

[0084] 1: case, 2: rotating electrical machine housing chamber, 3: inverter housing chamber (second housing chamber), 4: gear housing chamber, 5: equipment housing chamber (first housing chamber), 9: joint surface, 11: case body, 12: cover member, 13: partition member, 19: protrusion, 51: inverter side bus bar (terminal of inverter device), 52: connection member, 53: rotating electrical machine side bus bar (terminal connected to stator coil of rotating electrical machine), 54: fastening portion, 55: bus bar fastening member (fastening member), 61: peripheral wall portion, 62: axial wall portion, 70: partition wall portion, 70t: partition wall portion axial direction first side end portion (partition wall portion axial direction first side end portion ), 81: stator, 82: rotor, 83: stator coil, 100: vehicle drive device, A1: first shaft, A2: second shaft, A3: third shaft, CG: counter gear mechanism, DF: differential gear mechanism, G: gear, G1: input gear (first gear), G2: counter driven gear (third gear), G3: counter drive gear (fourth gear), G4: differential input gear (second gear), INV: inverter device, L: axial direction, L1: axial first side, L2: axial second side, MG: rotating electric machine, MGt: axial first side end of rotating electric machine (axial first side end of rotating electric machine), R: radial direction, W: wheel

Claims

1. A rotating electric machine, a plurality of gears provided in a power transmission path from the rotating electric machine; a differential gear mechanism that distributes driving force transmitted from the rotating electric machine via the plurality of gears to a plurality of wheels; an inverter device that drives and controls the rotating electric machine; a case; a direction along the rotation axis of the rotating electric machine is defined as an axial direction; The direction perpendicular to the axial direction is the radial direction, the case includes a case main body that defines a first accommodation chamber that accommodates the rotating electric machine and the plurality of gears and a second accommodation chamber that accommodates the inverter device, and a cover member that is joined to the case main body in the axial direction and closes the first accommodation chamber, One side in the axial direction is defined as an axial first side, and the opposite side is defined as an axial second side, the cover member is joined to the case body on the second axial side and is disposed to cover the first accommodating chamber on the second axial side, a case main body including a partition wall portion that radially separates the first accommodating chamber from the second accommodating chamber, a peripheral wall portion that covers the radial outside of the first accommodating chamber, and an axial wall portion that covers the first axial side of the first accommodating chamber, wherein the partition wall portion, the peripheral wall portion, and the axial wall portion are integrally formed as a single casting.

2. the first housing chamber includes a rotating electric machine housing chamber that houses the rotating electric machine and a gear housing chamber that houses the plurality of gears, The vehicle drive device according to claim 1 , wherein the case includes a partition member disposed between the rotating electrical machine housing chamber and the gear housing chamber in the axial direction and fixed to the case body.

3. the rotating electric machine includes a stator, 3. The vehicle drive device according to claim 2, wherein a member extending in the axial direction and supporting the partition member is disposed radially outward of the stator with a gap between it and the partition wall portion in the radial direction.

4. the rotating electric machine includes a stator, a member having an oil passage extending in the axial direction provided radially outward of the stator; The vehicle drive device according to claim 2 , wherein the member supports the partition member at an end opposite to the axial wall portion.

5. the rotating electric machine includes a rotor, The vehicle drive device according to claim 2 , wherein the rotor is supported by the axial wall portion and the partition member.

6. the rotating electric machine includes a rotor, 6. The vehicle drive device according to claim 2, wherein an end portion of the partition wall portion on the first axial side is positioned on the first axial side of an end portion of the rotor on the first axial side.

7. the rotating electric machine includes a stator, 7. The vehicle drive device according to claim 2, wherein an end portion of the partition wall portion on the first axial side is positioned on the first axial side of an end portion of the stator on the first axial side.

8. 8. The vehicle drive device according to claim 6, wherein an area where the partition wall portion is disposed in the axial direction overlaps an area where the partition member is disposed in the axial direction.

9. 9. The vehicle drive device according to claim 8, wherein the partition wall portion is disposed so as to overlap with an arrangement area of ​​at least some of the gears in the axial direction.

10. a fastening portion of a connecting member for electrically connecting the rotating electric machine and the inverter device is disposed in the first housing chamber; The vehicle drive device according to claim 2 , wherein the partition member is arranged so as not to overlap the fastening portion when viewed in the axial direction along the axial direction.

11. 11. The vehicle drive device according to claim 10, wherein the connecting member is fastened by a fastening member, and the fastening member is inserted from the second axial side and positioned in an orientation such that a head of the fastening member is positioned on the second axial side.

12. a terminal of the inverter device is disposed on the first axial side of the inverter device in the axial direction; The vehicle drive device according to claim 1 , wherein a terminal connected to a stator coil of the rotary electric machine is disposed on the first axial side of the rotary electric machine in the axial direction.

13. The vehicle drive device according to claim 1 , wherein a radial oil passage extending in the radial direction is formed inside the axial wall portion.

14. the rotating electric machine includes a stator, The vehicle drive device according to claim 13, wherein an axial oil passage extending in the axial direction from the radial oil passage is provided on the radial outside of the stator.

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