JP2021065022A - Rotary electric machine - Google Patents

Abstract

To achieve a technique capable of appropriately cooling a stator while suppressing an increase of a dimension of a rotary electric machine in size in an axial view.SOLUTION: A first step part 63A comprising a first step surface 64A directed to an axial direction first side L1 is formed at a position overlapped with a stator core 15A in a radial view along a radial direction R in an inner surface 61 of a peripheral wall part 60, and a second step part 63B comprising a second step surface 64B directed to an axial direction second side L2 is formed in the inner surface 61 of the peripheral wall part 60. A rotary electric machine 1A comprises a first oil supply port 3A that is opened to the second step surface 64B, and injects an oil toward the first step surface 64A.SELECTED DRAWING: Figure 5

Description

The present invention relates to a rotary electric machine including a rotor, a stator arranged radially outside the rotor, and a case for accommodating the rotor and the stator.

An example of the rotary electric machine as described above is disclosed in Japanese Patent Application Laid-Open No. 2014-2257696 (Patent Document 1). Hereinafter, the reference numerals shown in parentheses in the description of the background technology are those of Patent Document 1. As shown in FIG. 1 of Patent Document 1, in the electric motor (3) of Patent Document 1, a supply hole (20) extending in the axial direction is formed on the outer side in the radial direction with respect to the stator (12). It is configured to supply the cooling oil flowing through the supply hole (20) to the coil end (14). Further, in the electric motor (3) of Patent Document 1, a cooling water channel (26) for cooling the stator core (12a) is formed on the outer side in the radial direction with respect to the stator (12).

Japanese Unexamined Patent Publication No. 2014-225769

As described above, in the rotary electric machine of Patent Document 1 (the electric motor in Patent Document 1), an oil passage through which the cooling oil flows and a water passage through which the cooling water flows are formed on the outer side in the radial direction with respect to the stator. Therefore, the size of the rotary electric machine in the axial direction tends to increase.

Therefore, it is desired to realize a technique capable of appropriately cooling the stator while suppressing an increase in the size of the rotary electric machine in the axial direction.

A rotary electric machine including a rotor, a stator arranged radially outside the rotor, and a case for accommodating the rotor and the stator, wherein the case has the diameter with respect to the stator. The stator includes a peripheral wall portion that is arranged outside the direction and surrounds the outer peripheral surface of the stator, and the stator includes a stator core having a cylindrical main body portion that extends in the axial direction and a shaft that is one side of the stator core in the axial direction. A first stepped surface facing the first side in the axial direction at a position overlapping the stator core in a radial direction along the radial direction on the inner surface of the peripheral wall portion, provided with a coil end portion protruding to the first side in the direction. A first stepped portion is formed, and a second stepped portion provided on the inner surface of the peripheral wall portion is provided with a second stepped surface facing the second side in the axial direction, which is opposite to the first side in the axial direction in the axial direction. Is formed, an opening is provided in the second stepped surface, and a first oil supply port for injecting oil toward the first stepped surface is provided.

According to this configuration, the oil injected from the first oil supply port is applied to the first stepped surface arranged at a position overlapping the stator core in the radial direction, and is supplied to the stator core from there to cool the stator core. can do. With the configuration in which the oil is supplied to the stator core in this way, the first oil supply port can be provided at a position different from that of the stator core in the axial direction. Therefore, compared to the case where the first oil supply port is provided at a position overlapping the stator core in the radial direction, it is easier to arrange the first oil supply port inside in the radial direction, which makes it easier to arrange the first oil supply port in the radial direction. It is possible to appropriately cool the stator while suppressing the increase in the size of the rotary electric machine.

Further features and advantages of the rotary electric machine will be clarified from the following description of the embodiments described with reference to the drawings.

Skeleton diagram of the vehicle drive device according to the embodiment Sectional drawing of the drive device for a vehicle which concerns on embodiment The figure which shows the arrangement relation in the axial direction of each component of the vehicle drive device which concerns on embodiment. Speed diagram of the differential gear device according to the embodiment Cross-sectional view of a part of the rotary electric machine according to the embodiment Cross-sectional view of a part of the rotary electric machine according to the embodiment A perspective view of a part of the second case portion according to the embodiment. A perspective view of a part of the first case portion according to the embodiment. Axial view of a part of the second case portion according to the embodiment Skeleton diagram of vehicle drive device according to other embodiments Skeleton diagram of vehicle drive device according to other embodiments Skeleton diagram of vehicle drive device according to other embodiments

An embodiment of a rotary electric machine will be described with reference to the drawings. In this embodiment, the rotary electric machine is used as a vehicle drive device. The direction of each member in the following description represents the direction in which they are assembled to a rotary electric machine or a vehicle drive device. In addition, terms related to the dimensions, arrangement direction, arrangement position, etc. of each member are concepts including a state in which there is a difference due to an error (an error to an extent acceptable in manufacturing).

As used herein, the term "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 the two rotating elements are connected so as to rotate integrally. This includes 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 (for example, shafts, gear mechanisms, belts, chains, etc.) that transmit rotation at the same speed or at different speeds, and are responsible for selectively transmitting rotation and driving force. A mating device (eg, friction engaging device, meshing engaging device, etc.) may be included. However, when the term "drive connection" is used for each rotating element of the differential gear device, it means that the three or more rotating elements included in the differential gear device are driven and connected to each other without interposing other rotating elements. It shall point.

In the present specification, "rotary electric machine" is used as a concept including any of a motor (electric motor), a generator (generator), and, if necessary, a motor / generator that functions as both a motor and a generator. Further, in the present specification, with respect to the arrangement of the two members, "overlapping in a specific direction" means that a virtual straight line parallel to the line-of-sight direction is moved in each direction orthogonal to the virtual straight line. It means that there is at least a part of the region where the virtual straight line intersects both of the two members.

As shown in FIGS. 1 and 2, the vehicle drive device 100 rotates integrally with the first rotary electric machine 1A, the first input shaft 14A that is driven and connected to the first rotary electric machine 1A, and the first wheel W1. The rotation of the first output member 2A connected to the first output shaft 90A, the second output member 2B connected to the second output shaft 90B that rotates integrally with the second wheel W2, and the first input shaft 14A. Is provided with a differential gear device 6 that transmits the above to the first output member 2A and the second output member 2B. The first wheel W1 and the second wheel W2 are 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) in a vehicle (a vehicle on which a vehicle drive device 100 is mounted). The first output shaft 90A is connected to the first wheel W1 via, for example, a constant velocity joint, so as to rotate integrally with the first wheel W1. Further, the second output shaft 90B is connected to the second wheel W2 so as to rotate integrally with the second wheel W2 by being connected to the second wheel W2 via, for example, a constant velocity joint. The torque of the first rotary electric machine 1A input to the first input shaft 14A is transmitted to the first output member 2A and the second output member 2B via the differential gear device 6, so that the first wheel W1 and the first wheel W1 and the second Two wheels W2 are driven. As described above, the first rotary electric machine 1A is used for the vehicle drive device 100. Specifically, the first rotary electric machine 1A is used as a driving force source for the wheels (here, the first wheel W1 and the second wheel W2). In the present embodiment, the first rotary electric machine 1A corresponds to the "rotary electric machine".

In the present embodiment, the vehicle drive device 100 further includes a second rotary electric machine 1B and a second input shaft 14B that is driven and connected to the second rotary electric machine 1B. Then, the differential gear device 6 transmits the rotation of the first input shaft 14A to the first output member 2A and the second output member 2B, and transmits the rotation of the second input shaft 14B to the first output member 2A and the second output. It is transmitted to the member 2B. The torque of the first rotary electric machine 1A input to the first input shaft 14A and the torque of the second rotary electric machine 1B input to the second input shaft 14B are transferred to the first output member 2A and the first output member 2A via the differential gear device 6. The first wheel W1 and the second wheel W2 are driven by being transmitted to the two output members 2B.

The first rotary electric machine 1A, the second rotary electric machine 1B, the first input shaft 14A, the second input shaft 14B, the first output member 2A, the second output member 2B, and the differential gear device 6 are housed in the case CS. There is. The first counter gear mechanism 5A, which will be described later, and the second counter gear mechanism 5B, which will be described later, are also housed in the case CS. Here, "accommodating" means accommodating at least a part of the object to be accommodated.

The first rotary electric machine 1A includes a first stator 11A fixed to the case CS and a first rotor 12A rotatably supported by the case CS with respect to the first stator 11A. The first rotor 12A and the first stator 11A are housed in the case CS. That is, the first rotary electric machine 1A includes a first rotor 12A, a first stator 11A, and a case CS accommodating the first rotor 12A and the first stator 11A. The first stator 11A is arranged outside the radial direction R with respect to the first rotor 12A. Specifically, the first rotary electric machine 1A is an inner rotor type rotary electric machine, and the first stator 11A (specifically, the first stator core 15A described later) is in the radial direction R with respect to the first rotor 12A. It is arranged on the outside so as to overlap the first rotor 12A in a radial direction along the radial direction R. Here, the radial direction R is a radial direction based on the first rotor shaft 13A described later (in other words, a radial direction based on the rotation axis of the first rotor 12A), and will be described later in the present embodiment. It is the radial direction with respect to the first axis X1. In this embodiment, the first stator 11A corresponds to the "stator" and the first rotor 12A corresponds to the "rotor".

As shown in FIG. 2, the first stator 11A includes a first stator core 15A and a first coil end portion 18A protruding from the first stator core 15A to the first side L1 in the axial direction, which is one side of the axial direction L. I have. Here, the axial direction L is an axial direction with reference to the first rotor shaft 13A (in other words, a direction in which the rotation axis of the first rotor 12A extends). The first stator 11A further includes a second coil end portion 18B protruding from the first stator core 15A to the second side L2 in the axial direction. Here, the second side L2 in the axial direction is opposite to the first side L1 in the axial direction in the axial direction L. The first stator core 15A and the second stator core 15B, which will be described later, are formed by, for example, laminating a plurality of magnetic steel plates (for example, electromagnetic steel plates such as silicon steel plates) in the axial direction L, or forming powder of a magnetic material. It is formed with a powdered material formed by pressure molding as a main component. A coil is wound around the first stator core 15A, and a portion of the coil protruding from the first stator core 15A to the first side L1 in the axial direction forms the first coil end portion 18A, and the shaft from the first stator core 15A in the coil. The portion protruding toward L2 on the second side in the direction forms the second coil end portion 18B. In the present embodiment, the first stator core 15A corresponds to the "stator core" and the first coil end portion 18A corresponds to the "coil end portion".

The second rotary electric machine 1B includes a second stator 11B fixed to the case CS and a second rotor 12B rotatably supported by the case CS with respect to the second stator 11B. The second rotor 12B and the second stator 11B are housed in the case CS. That is, the second rotary electric machine 1B includes a second rotor 12B, a second stator 11B, and a case CS that accommodates the second rotor 12B and the second stator 11B. The second stator 11B is arranged outside the radial direction R with respect to the second rotor 12B. Specifically, the second rotary electric machine 1B is an inner rotor type rotary electric machine, and the second stator 11B (specifically, the second stator core 15B described later) is outside the second rotor 12B in the radial direction. It is arranged so as to overlap with the second rotor 12B in the radial direction along the radial direction. The radial direction here is a radial direction based on the second rotor shaft 13B, which will be described later (in other words, a radial direction based on the rotation axis of the second rotor 12B). In the present embodiment, since the second rotary electric machine 1B is arranged coaxially with the first rotary electric machine 1A, the radial direction here coincides with the radial direction R.

As shown in FIG. 2, the second stator 11B includes a second stator core 15B and a third coil end portion 18C projecting from the second stator core 15B to the second side L2 in the axial direction. The second stator 11B further includes a fourth coil end portion 18D projecting from the second stator core 15B to the first side L1 in the axial direction. A coil is wound around the second stator core 15B, and a portion of the coil protruding from the second stator core 15B to the second side L2 in the axial direction forms a third coil end portion 18C, and the shaft from the second stator core 15B of the coil. The portion protruding toward L1 on the first side in the direction forms the fourth coil end portion 18D.

The first rotary electric machine 1A and the second rotary electric machine 1B are electrically connected to a power storage device (not shown) such as a battery or a capacitor, and receive power from the power storage device to perform power or power the vehicle. The electric power generated by the inertial force is supplied to the electric power storage device to store the electric power. The second rotary electric machine 1B is rotatably provided independently of the first rotary electric machine 1A. That is, the second rotor 12B is rotatably provided independently of the first rotor 12A. The ratio of the rotation speed of the first rotor 12A to the rotation speed of the second rotor 12B changes according to the state of the vehicle drive device 100. In the present embodiment, as the first rotary electric machine 1A and the second rotary electric machine 1B, two rotary electric machines having the same output characteristics are used. As the first rotary electric machine 1A and the second rotary electric machine 1B, two rotary electric machines having different output characteristics may be used.

In the present embodiment, the first input shaft 14A is connected to the first rotary electric machine 1A so as to rotate integrally with the first rotary electric machine 1A, and the second input shaft 14B is integrally connected with the second rotary electric machine 1B. It is connected to the second rotary electric machine 1B so as to rotate. In the present embodiment, the first input shaft 14A is a separate member from the first rotor shaft 13A, and is connected to the first rotor shaft 13A so as to rotate integrally with the first rotor shaft 13A. Further, in the present embodiment, the second input shaft 14B is a separate member from the second rotor shaft 13B, and is connected to the second rotor shaft 13B so as to rotate integrally with the second rotor shaft 13B. Here, the first rotor shaft 13A is a shaft member to which the first rotor 12A is fixed, and rotates integrally with the first rotor 12A. Further, the second rotor shaft 13B is a shaft member to which the second rotor 12B is fixed, and rotates integrally with the second rotor 12B. The first input shaft 14A is connected to the first rotary electric machine 1A without passing through the first rotor shaft 13A (that is, the first rotor 12A is fixed to the first input shaft 14A), or the first The two input shafts 14B may be connected to the second rotary electric machine 1B without passing through the second rotor shaft 13B (that is, the second rotor 12B may be fixed to the second input shaft 14B).

As shown in FIG. 2, the first output member 2A is arranged coaxially with the second output member 2B on the second side L2 in the axial direction with respect to the second output member 2B. The first output member 2A is connected to the first output shaft 90A so as to rotate integrally with the first output shaft 90A, and the second output member 2B is connected to the first output shaft 90A so as to rotate integrally with the second output shaft 90B. 2 Connected to the output shaft 90B.

As shown in FIG. 2, the first input shaft 14A is arranged coaxially with the second input shaft 14B on the second side L2 in the axial direction with respect to the second input shaft 14B. Further, the first rotor shaft 13A is arranged coaxially with the first input shaft 14A on the second side L2 in the axial direction with respect to the first input shaft 14A, and the second rotor shaft 13B is arranged with respect to the second input shaft 14B. It is arranged coaxially with the second input shaft 14B on the first side L1 in the axial direction. That is, the first rotary electric machine 1A is arranged coaxially with the second rotary electric machine 1B on the second side L2 in the axial direction with respect to the second rotary electric machine 1B.

In the present embodiment, the vehicle drive device 100 includes a first counter gear mechanism 5A and a second counter gear mechanism 5B. The first counter gear mechanism 5A is arranged coaxially with the second counter gear mechanism 5B on the second side L2 in the axial direction with respect to the second counter gear mechanism 5B. The first counter gear mechanism 5A includes a first counter input gear 51A, a first counter output gear 52A, and a first counter shaft 53A connecting the first counter input gear 51A and the first counter output gear 52A. .. Further, the second counter gear mechanism 5B includes a second counter input gear 51B, a second counter output gear 52B, and a second counter shaft 53B that connects the second counter input gear 51B and the second counter output gear 52B. ing. Then, the first counter input gear 51A meshes with the first input gear 4A that rotates integrally with the first input shaft 14A, and the first counter output gear 52A is the first input rotating element (this) of the differential gear device 6. In the embodiment, it meshes with the first differential input gear 7A connected to the first rotating element E1) described later. Further, the second counter input gear 51B meshes with the second input gear 4B that rotates integrally with the second input shaft 14B, and the second counter output gear 52B is the second input rotating element (this) of the differential gear device 6. In the embodiment, it meshes with the second differential input gear 7B connected to the fourth rotating element E4) described later. Therefore, the rotation of the first input shaft 14A is input to the differential gear device 6 via the first counter gear mechanism 5A, and the rotation of the second input shaft 14B is the differential gear via the second counter gear mechanism 5B. It is input to the device 6.

In the present embodiment, the first counter input gear 51A is formed to have a larger diameter than the first input gear 4A, and the first differential input gear 7A is formed to have a larger diameter than the first counter output gear 52A. .. Therefore, the rotation of the first input shaft 14A is decelerated according to the gear ratio between the first input gear 4A and the first counter input gear 51A, and the first counter output gear 52A and the first differential input gear 7A are reduced. It is further decelerated (that is, decelerated by two steps) according to the ratio of the number of teeth to and is input to the differential gear device 6. Further, in the present embodiment, the second counter input gear 51B is formed to have a larger diameter than the second input gear 4B, and the second differential input gear 7B is formed to have a larger diameter than the second counter output gear 52B. ing. Therefore, the rotation of the second input shaft 14B is decelerated according to the gear ratio between the second input gear 4B and the second counter input gear 51B, and the second counter output gear 52B and the second differential input gear 7B are reduced. It is further decelerated (that is, decelerated by two steps) according to the ratio of the number of teeth to and is input to the differential gear device 6.

The first rotary electric machine 1A and the second rotary electric machine 1B are arranged on the first axis X1. Specifically, the first rotor 12A and the second rotor 12B are arranged on the first shaft X1, and the first rotor shaft 13A, the second rotor shaft 13B, the first input shaft 14A, and the second input shaft 14B is also arranged on the first axis X1. The first output member 2A and the second output member 2B are arranged on a second axis X2 different from the first axis X1. The differential gear device 6 is also arranged on the second axis X2. The first counter gear mechanism 5A and the second counter gear mechanism 5B are arranged on a third axis X3, which is different from the first axis X1 and the second axis X2. The first axis X1, the second axis X2, and the third axis X3 are axes (virtual axes) arranged in parallel with each other. The axial direction L is a direction parallel to the first axis X1, the second axis X2, and the third axis X3 (that is, an axial direction common among these axes).

As shown in FIGS. 1 and 4, the differential gear device 6 includes a first rotating element E1, a second rotating element E2, a third rotating element E3, and a fourth rotating element E4 in the order of rotational speed. .. Here, the "order of rotation speeds" is the order of rotation speeds of each rotating element in the rotating state. The rotational speed of each rotating element changes depending on the rotational state of the differential gear device 6, but the order of the high and low rotational speeds of each rotating element is constant because it is determined by the structure of the differential gear device 6. .. The order of rotation speeds of each rotating element is the same as the order of arrangement in the speed diagram (collinear diagram, see FIG. 4) of each rotating element. Here, the arrangement order of each rotating element in the speed diagram is the order in which the axes corresponding to each rotating element in the speed diagram (collinear diagram) are arranged along the direction orthogonal to the axis. is there. The arrangement direction of the axes corresponding to each rotating element in the speed diagram (collinear diagram) differs depending on how the speed diagram is drawn, but the arrangement order is fixed because it is determined by the structure of the differential gear device 6. Become.

As shown in FIG. 1, the first input shaft 14A is driven and connected to the first rotating element E1, the first output member 2A is driven and connected to the second rotating element E2, and the second output member 2B is driven and connected to the third rotating element E3. Is driven and connected, and the second input shaft 14B is driven and connected to the fourth rotating element E4. As a result, the torque of the first input shaft 14A and the second input shaft 14B is distributed and transmitted to the first output member 2A and the second output member 2B by the differential gear device 6. In the present embodiment, the first rotating element E1 is connected to the first differential input gear 7A so as to rotate integrally with the first differential input gear 7A that meshes with the first counter output gear 52A. That is, the first input shaft 14A is drive-connected to the first rotating element E1 via the first counter gear mechanism 5A. The second rotating element E2 is connected to the first output member 2A so as to rotate integrally with the first output member 2A. The third rotating element E3 is connected to the second output member 2B so as to rotate integrally with the second output member 2B. The fourth rotating element E4 is connected to the second differential input gear 7B so as to rotate integrally with the second differential input gear 7B that meshes with the second counter output gear 52B. That is, the second input shaft 14B is drive-connected to the fourth rotating element E4 via the second counter gear mechanism 5B.

As described above, in the present embodiment, the first output member 2A that rotates integrally with the second rotating element E2 is connected to the first output shaft 90A so as to rotate integrally with the first output shaft 90A. The second output member 2B that rotates integrally with the third rotating element E3 is connected to the second output shaft 90B so as to rotate integrally with the second output shaft 90B. Therefore, when the vehicle travels straight, the four rotating elements included in the differential gear device 6 rotate at the same speed (that is, the differential gear device 6 does not perform differential operation). On the other hand, when the vehicle turns, as shown in FIG. 4, a state in which the four rotating elements included in the differential gear device 6 rotate at different rotational speeds (that is, the differential gear device 6 performs differential operation). State). As described above, in the present embodiment, the scene in which the differential gear device 6 performs the differential operation is limited to the time when the vehicle turns.

In the present embodiment, the second input gear 4B is formed to have the same diameter as the first input gear 4A, the second counter input gear 51B is formed to have the same diameter as the first counter input gear 51A, and the second counter output gear is formed. The 52B is formed to have the same diameter as the first counter output gear 52A, and the second differential input gear 7B is formed to have the same diameter as the first differential input gear 7A. Therefore, the gear ratio from the second rotary electric machine 1B to the fourth rotary element E4 is equal to the gear ratio from the first rotary electric machine 1A to the first rotary element E1.

In the present embodiment, the differential gear device 6 includes a first sun gear S61 which is a first rotating element E1, a second sun gear S62 which is a second rotating element E2, a carrier C6 which is a third rotating element E3, and a second. It is a planetary gear device (planetary gear type differential gear device) including a ring gear R6 which is a four-rotating element E4. The carrier C6 rotatably supports a first pinion gear P61 that meshes with the first sun gear S61 and a ring gear R6, and a second pinion gear P62 that rotates integrally with the first pinion gear P61 and meshes with the second sun gear S62. .. The first pinion gear P61 and the second pinion gear P62 are rotatably supported by a pinion shaft P63 held by the carrier C6. In the example shown in FIG. 3, five first pinion gears P61 and five second pinion gears P62 are provided. The first pinion gear P61 is formed to have a larger diameter than the second pinion gear P62, and the first sun gear S61 is formed to have a smaller diameter than the second sun gear S62.

In the examples shown in FIGS. 1 and 2, the first sun gear S61 is formed on the outer peripheral surface of the first connecting shaft 9A, and the first connecting shaft 9A is formed with the first differential input gear 7A on the outer peripheral surface. It is connected to the first connecting member 8A (here, it is connected by spline engagement). The second sun gear S62 is formed on the outer peripheral surface of the second connecting shaft 9B, and the second connecting shaft 9B is connected to the first output member 2A (here, connected by spline engagement). The carrier C6 is connected to the second output member 2B (here, it is connected by spline engagement). The ring gear R6 is formed on the inner peripheral surface of the second connecting member 8B in which the second differential input gear 7B is formed on the outer peripheral surface.

In the present embodiment, each gear (specifically, ring gear R6, first pinion gear P61, second pinion gear P62, first sun gear S61, and second sun gear S62) included in the differential gear device 6 is a spur gear (tooth). A cylindrical gear with straight streaks). As described above, in the present embodiment, the scene in which the differential gear device 6 performs the differential operation is limited to the time when the vehicle turns. Therefore, even if each gear included in the differential gear device 6 is a spur gear, the influence of gear noise that may occur when the differential gear device 6 performs the differential operation can be suppressed to a small value. Further, by using spur gears for each gear included in the differential gear device 6, it is possible to simplify the configuration for supporting each gear in the axial direction L, mainly using the load received by each gear as a radial load. It has become.

In the speed diagram (see FIG. 4), by making the distance between the first rotation element E1 and the second rotation element E2 equal to the distance between the third rotation element E3 and the fourth rotation element E4, the first rotation element When the difference between the torque input to E1 and the torque input to the fourth rotating element E4 is zero, the difference between the torque output from the second rotating element E2 and the torque output from the third rotating element E3. Can be zero. In the present embodiment, the distance between the two gears in the speed diagram is made equal by setting the number of teeth of each gear provided in the differential gear device 6 so that the following equation (1) holds.
1 / Zr = 1 / Zs1- (1 / Zs2) × (Zp2 / Zp1) ... (1)
Here, Zr is the number of teeth of the ring gear R6, Zp1 is the number of teeth of the first pinion gear P61, Zp2 is the number of teeth of the second pinion gear P62, Zs1 is the number of teeth of the first sun gear S61, and Zs2. Is the number of teeth of the second sun gear S62.

As shown in FIG. 2, in the present embodiment, the case CS is arranged on the first side L1 in the axial direction with respect to the first case portion CS1 and the first case portion CS1 and is joined to the first case portion CS1. It includes a second case portion CS2. The case CS further includes a third case portion CS3 and a fourth case portion CS4 arranged on the second side L2 in the axial direction with respect to the third case portion CS3 and joined to the third case portion CS3. There is. The fourth case portion CS4 is arranged on the first side L1 in the axial direction with respect to the second case portion CS2 and is joined to the second case portion CS2. The case CS further includes a fifth case portion CS5. Unlike the other case portions (CS1, CS2, CS3, CS4), the fifth case portion CS5 is arranged so as not to be exposed on the outer surface of the case CS. Here, the fifth case portion CS5 is joined to the fourth case portion CS4 in a state of being arranged between the second case portion CS2 and the fourth case portion CS4 in the axial direction L.

The first rotary electric machine 1A and the first rotor shaft 13A are housed between the axial direction L of the first case portion CS1 and the second case portion CS2 inside the case CS, and the second case portion CS2 inside the case CS. The first input shaft 14A, the first counter gear mechanism 5A, and the first output member 2A are housed between the fifth case portion CS5 and the fifth case portion CS5 in the axial direction L, and the fifth case portion CS5 and the fifth case portion CS5 inside the case CS The second input shaft 14B, the second counter gear mechanism 5B, the differential gear device 6, and the second output member 2B are housed between the four case portions CS4 in the axial direction L, and the fourth case inside the case CS. The second rotary electric machine 1B and the second rotor shaft 13B are housed between the portion CS4 and the third case portion CS3 in the axial direction L.

The case CS includes a peripheral wall portion 60 that is arranged outside the radial direction R with respect to the first stator 11A and surrounds the outer peripheral surface of the first stator 11A. The peripheral wall portion 60 is formed in a tubular shape extending in the axial direction L (here, a tubular shape whose cross-sectional shape differs depending on the position in the axial direction L). In the present embodiment, the peripheral wall portion 60 is further arranged outside the radial direction R with respect to the second stator 11B and is formed so as to surround the outer peripheral surface of the second stator 11B. Specifically, in the present embodiment, the peripheral wall portion 60 includes a portion formed by the first case portion CS1, a portion formed by the second case portion CS2, a portion formed by the third case portion CS3, and a first portion. 4 A part including a part formed by the case part CS4 is included. Then, the portions formed by the first case portion CS1 and the second case portion CS2 of the peripheral wall portion 60 are arranged so as to surround the outer peripheral surface of the first stator 11A, and the third case portion CS3 and the fourth case of the peripheral wall portion 60 are arranged. A portion formed by the portion CS4 is arranged so as to surround the outer peripheral surface of the second stator 11B.

Next, the cooling structure of the first stator 11A will be described. As shown in FIGS. 5 and 9, the first stator core 15A includes a cylindrical main body portion 16 extending in the axial direction L. In FIG. 9, the outer peripheral surface of the first stator core 15A is shown by a virtual line. The outer peripheral surface of the main body 16 is formed along a cylindrical surface extending in the axial direction L. As shown in FIG. 9, in the present embodiment, the first stator core 15A includes a protruding portion 17 projecting outward in the radial direction R with respect to the main body portion 16. The first stator core 15A includes protrusions 17 at a plurality of locations (for example, three or four locations) in the circumferential direction C. Here, the circumferential direction C is a circumferential direction with reference to the first rotor shaft 13A (in other words, a circumferential direction with reference to the rotation axis of the first rotor 12A), and in the present embodiment, the first shaft X1 (See FIG. 3). The protruding portion 17 is formed so as to extend in the axial direction L. Although details are omitted, an insertion hole through which a fastening member (for example, a fastening bolt) for fixing the first rotary electric machine 1A to the case CS is formed is formed in the protruding portion 17.

As shown in FIG. 9, in the present embodiment, the diameter of the outer peripheral surface of the first coil end portion 18A is smaller than the diameter of the outer peripheral surface of the main body portion 16. Here, the outer peripheral surface of the first coil end portion 18A is a surface along the outermost portion in the radial direction R of the coil constituting the first coil end portion 18A. In the present embodiment, the first coil end portion 18A is formed in a cylindrical shape extending in the axial direction L, and the outer peripheral surface of the first coil end portion 18A is formed along the cylindrical surface extending in the axial direction L. ing.

As shown in FIG. 5, the first stepped surface is located on the inner surface 61 (inner peripheral surface) of the peripheral wall portion 60 at a position overlapping the first stator core 15A in the radial direction (diametrical view along the radial direction R, the same applies hereinafter). A first step portion 63A including 64A is formed. In the present embodiment, the first step portion 63A is formed in the first case portion CS1. The first stepped surface 64A is a surface facing the first side L1 in the axial direction. That is, the first step surface 64A is a surface having a component in which the outward normal direction (normal vector) is toward the first side L1 in the axial direction. In the present embodiment, the first step surface 64A is formed along a surface orthogonal to the axial direction L. The first step portion 63A is formed at least at a specific position in the circumferential direction C, with the position in the circumferential direction C where the first oil supply port 3A (specifically, the first supply port 30A) described later is formed as a specific position. Will be done.

The first step portion 63A is formed at a position overlapping the intermediate portion in the axial direction L of the first stator core 15A in the radial direction. In the present embodiment, the first step portion 63A is formed at a position overlapping the central portion in the axial direction L of the first stator core 15A in the radial direction. Here, the central portion of the first stator core 15A in the axial direction L is, for example, a portion arranged in the center of the axial direction L when the first stator core 15A is evenly divided into N in the axial direction L. Here, "N" is an odd number of 3 or more, and can be, for example, "3", "5", or "7". Further, in the present embodiment, the first step portion 63A is formed at a position overlapping the outer peripheral surface of the main body portion 16 in the radial direction. That is, the first step portion 63A is formed at a position different from that of the protruding portion 17 in the circumferential direction C.

A second step portion 63B having a second step surface 64B is formed on the inner surface 61 of the peripheral wall portion 60. In the present embodiment, the second step portion 63B is formed at a position overlapping the first coil end portion 18A in the radial direction. Further, in the present embodiment, the second step portion 63B is formed in the second case portion CS2. In the present embodiment, a portion inside the radial direction R of the second step surface 64B (specifically, a portion arranged inside the radial direction R with respect to the first oil supply port 3A described later, FIGS. 5 and 5 and FIG. 9) is arranged so as to overlap the main body 16 in the axial direction along the axial direction L. The second stepped surface 64B is a surface facing the second side L2 in the axial direction. That is, the second step surface 64B is a surface having a component whose normal direction toward the outside is toward the second side L2 in the axial direction. In the present embodiment, the second step surface 64B is formed along a surface orthogonal to the axial direction L. The second step portion 63B is formed at least at the specific position in the circumferential direction C. In the present embodiment, the second step portion 63B is formed at a position overlapping the first coil end portion 18A in the radial direction, but the second step portion 63B is formed in the first coil end in the radial direction. It may be configured to be formed at a position that does not overlap with the portion 18A (for example, a position on the first side L1 in the axial direction with respect to the first coil end portion 18A).

The first rotary electric machine 1A includes a first oil supply port 3A that opens to the second step surface 64B and injects oil toward the first step surface 64A. As a result, the oil injected from the first oil supply port 3A is applied to the first step surface 64A (see the flow of oil indicated by the broken line arrow in FIG. 5), and the oil is applied from the first step surface 64A to the first stator core 15A. It is possible to cool the first stator core 15A by supplying the first stator core 15A. As shown in FIG. 5, the first oil supply port 3A is arranged so as to face the first step surface 64A in the axial direction L. Specifically, the first oil supply port 3A is arranged so as to overlap the first step surface 64A in the axial direction along the axial direction L. As shown in FIGS. 7 and 9, in the present embodiment, the first rotary electric machine 1A includes only one first oil supply port 3A. Specifically, the first rotary electric machine 1A includes a first supply port 30A as a first oil supply port 3A. The first rotary electric machine 1A may be configured to include a plurality of first oil supply ports 3A.

As shown in FIG. 6, in the present embodiment, the first rotary electric machine 1A opens at a position overlapping the first coil end portion 18A in the radial direction on the inner surface 61 of the peripheral wall portion 60, and the first coil end portion 18A It is provided with a second oil supply port 3B for supplying oil toward. As a result, the first coil end portion 18A can be cooled by supplying oil from the second oil supply port 3B to the first coil end portion 18A. In the present embodiment, the second oil supply port 3B is formed in the second case portion CS2.

As shown in FIGS. 7 and 9, in the present embodiment, the first rotary electric machine 1A includes a plurality of second oil supply ports 3B. Specifically, the first rotary electric machine 1A includes four second oil supply ports 3B of a second supply port 30B, a third supply port 30C, a fourth supply port 30D, and a fifth supply port 30E. .. The second supply port 30B, the third supply port 30C, the fourth supply port 30D, and the fifth supply port 30E are arranged at different positions in the circumferential direction C. Specifically, the fourth supply port 30D, the second supply port 30B, the third supply port 30C, and the fifth supply port 30E are arranged in the order described from one side of the circumferential direction C. The first supply port 30A described above is arranged between the second supply port 30B and the third supply port 30C in the circumferential direction C. The first rotary electric machine 1A may be configured to include only one second oil supply port 3B.

As shown in FIG. 6, in the present embodiment, the first rotary electric machine 1A opens at a position overlapping the second coil end portion 18B in the radial direction on the inner surface 61 of the peripheral wall portion 60, and the second coil end portion 18B It is provided with a fourth oil supply port 3D that supplies oil toward. As a result, the second coil end portion 18B can be cooled by supplying oil from the fourth oil supply port 3D to the second coil end portion 18B. In the present embodiment, the fourth oil supply port 3D is formed in the first case portion CS1.

As shown in FIG. 8, in the present embodiment, the first rotary electric machine 1A includes a plurality of fourth oil supply ports 3D. Specifically, the first rotary electric machine 1A includes four fourth oil supply ports 3D: a tenth supply port 30J, an eleventh supply port 30K, a twelfth supply port 30L, and a thirteenth supply port 30M. .. The tenth supply port 30J, the eleventh supply port 30K, the twelfth supply port 30L, and the thirteenth supply port 30M are arranged at different positions in the circumferential direction C. Specifically, the twelfth supply port 30L, the tenth supply port 30J, the eleventh supply port 30K, and the thirteenth supply port 30M are arranged in the order described from one side of the circumferential direction C. In this example, the tenth supply port 30J is arranged at the same position of the second supply port 30B and the circumferential direction C, and the eleventh supply port 30K is arranged at the same position of the third supply port 30C and the circumferential direction C. The twelfth supply port 30L is arranged at the same position in the circumferential direction C as the fourth supply port 30D, and the thirteenth supply port 30M is arranged at the same position in the circumferential direction C as in the fifth supply port 30E. The first rotary electric machine 1A may be configured to include only one fourth oil supply port 3D.

As shown in FIG. 6, in the present embodiment, an oil passage 71 extending along the axial direction L is formed in the peripheral wall portion 60, and the first rotary electric machine 1A is the first in the radial direction on the inner surface 61 of the peripheral wall portion 60. A third oil supply port 3C that opens at a position overlapping the stator core 15A and communicates with the oil passage 71 is provided. As a result, the first stator core 15A can be cooled by supplying the oil in the oil passage 71 to the first stator core 15A from the third oil supply port 3C. As shown in FIG. 6, the third oil supply port 3C is formed at a position overlapping the intermediate portion in the axial direction L of the first stator core 15A in the radial direction. In the present embodiment, the third oil supply port 3C is formed at a position overlapping the central portion in the axial direction L of the first stator core 15A in the radial direction. Further, in the present embodiment, the third oil supply port 3C is formed at a position overlapping the outer peripheral surface of the main body 16 in the radial direction. That is, the third oil supply port 3C is formed at a position different from that of the protruding portion 17 in the circumferential direction C.

As shown in FIGS. 7 and 9, in the present embodiment, the first rotary electric machine 1A includes a plurality of third oil supply ports 3C. Specifically, the first rotary electric machine 1A includes four third oil supply ports 3C of a sixth supply port 30F, a seventh supply port 30G, an eighth supply port 30H, and a ninth supply port 30I. .. The sixth supply port 30F, the seventh supply port 30G, the eighth supply port 30H, and the ninth supply port 30I are arranged at different positions in the circumferential direction C. Specifically, the sixth supply port 30F, the seventh supply port 30G, the eighth supply port 30H, and the ninth supply port 30I are arranged in the order described from one side of the circumferential direction C. The first supply port 30A, the second supply port 30B, and the third supply port 30C described above are arranged between the seventh supply port 30G and the eighth supply port 30H in the circumferential direction C. The first rotary electric machine 1A may be configured to include only one third oil supply port 3C.

In the present embodiment, the first rotary electric machine 1A includes a plurality of oil passages 71 for supplying oil to the third oil supply port 3C. Specifically, the first rotary electric machine 1A includes two oil passages 71, a first oil passage 71A and a second oil passage 71B. The first oil passage 71A and the second oil passage 71B are formed so as to extend along the axial direction L at different positions in the circumferential direction C. Here, the first oil passage 71A and the second oil passage 71B are formed so as to extend along the axial direction L at positions opposite to each other in the circumferential direction C with respect to the first step portion 63A. The sixth supply port 30F and the seventh supply port 30G are formed so as to communicate with the first oil passage 71A, and the eighth supply port 30H and the ninth supply port 30I communicate with the second oil passage 71B. Is formed in.

As shown in FIG. 6, in the present embodiment, the oil passage 71 is connected to the second case portion CS2 from the inside of the first case portion CS1 via the mating surface 62 of the first case portion CS1 and the second case portion CS2. It is continuously formed up to the inside. Here, the mating surface 62 is a surface (first joint surface CS1a) joined to the second case portion CS2 in the first case portion CS1 and a surface joined to the first case portion CS1 in the second case portion CS2 (first joint surface CS1a). The second joint surface CS2a) is the surface to be combined. Then, in the present embodiment, a communication hole 72 for communicating the oil passage 71 and the third oil supply port 3C is formed on the mating surface 62. Specifically, a communication hole 72 for communicating the first oil passage 71A and the sixth supply port 30F, and the first oil passage 71A and the seventh oil passage 71A are formed in the portion of the mating surface 62 where the first oil passage 71A is formed. A communication hole 72 that communicates with the supply port 30G is formed. Further, in the portion of the mating surface 62 where the second oil passage 71B is formed, a communication hole 72 for communicating the second oil passage 71B and the eighth supply port 30H, and the second oil passage 71B and the ninth supply port 30I A communication hole 72 is formed to communicate with the above.

As shown in FIGS. 6 to 8, in the present embodiment, a concave groove recessed on the first side L1 in the axial direction is formed on the second joint surface CS2a, and the first joint surface CS1a forms the concave groove in the second axial direction. By covering from the side L2, a communication hole 72 is formed. In addition, unlike such a configuration, a concave groove recessed in the second side L2 in the axial direction is formed on the first joint surface CS1a, and the second joint surface CS2a covers the concave groove from the first side L1 in the axial direction. Therefore, the communication hole 72 may be formed. Further, a concave groove recessed on the second side L2 in the axial direction is formed on the first joint surface CS1a, and a concave groove recessed on the first side L1 in the axial direction is formed on the second joint surface CS2a, and these two concave grooves are formed. The grooves may be arranged so as to face each other in the axial direction L to form the communication hole 72.

Here, as shown in FIG. 9, it is a circle centered on the first axis X1 (see FIG. 3) in the axial direction, and is the outermost peripheral portion of each of the plurality of protruding portions 17 (the outermost portion in the radial direction R). The circle passing through the outer part) is defined as the reference circle A. That is, the circle circumscribing the first stator core 15A in the axial direction is defined as the reference circle A. As shown in FIG. 9, in the present embodiment, the first oil supply port 3A, the second oil supply port 3B, and the third oil supply port 3C are arranged in the same circumferential circle as the protrusion 17 in the axial direction. ing. That is, at least a part of the first oil supply port 3A, at least a part of the second oil supply port 3B, and at least a part of the third oil supply port 3C are the outer peripheral surface of the main body 16 and the reference circle in the axial direction. It is placed between A and A. As a result, the first oil supply port 3A, the second oil supply port 3B, and the third oil supply port 3C are arranged so as to be aligned with the protrusion 17 in the circumferential direction in the axial direction.

In the present embodiment, the first oil supply port 3A, the second oil supply port 3B, and the third oil supply port 3C are on the inner peripheral side (inside of the radial direction R) from the outermost peripheral portion of the protruding portion 17 in the axial direction. Is located in. That is, in the present embodiment, the entire first oil supply port 3A, the entire second oil supply port 3B, and the entire third oil supply port 3C are on the inner peripheral side with respect to the reference circle A in the axial direction. Have been placed. In addition, unlike such a configuration, a part of the first oil supply port 3A is arranged on the outer peripheral side (outside the radial direction R) with respect to the reference circle A in the axial direction. 2 A part of the oil supply port 3B is arranged on the outer peripheral side with respect to the reference circle A in the axial direction, or a part of the third oil supply port 3C is a reference circle in the axial direction. It may be configured to be arranged on the outer peripheral side with respect to A. Further, here, the first oil supply port 3A, the second oil supply port 3B, and the third oil supply port 3C are arranged in the same circumferential circle as the protruding portion 17 in the axial direction. At least one of the 1 oil supply port 3A, the 2nd oil supply port 3B, and the 3rd oil supply port 3C may not be arranged in the same circumferential circle as the protruding portion 17 in the axial direction.

In the present embodiment, the oil discharged by the oil pump 73 is supplied to the first oil supply port 3A, the second oil supply port 3B, the third oil supply port 3C, and the fourth oil supply port 3D via a common oil passage. It is configured to supply each. Specifically, as shown in FIG. 6, the oil discharged by the oil pump 73 is supplied to the third oil passage 71C through an oil cooler 75, which is a heat exchanger that cools the oil. The oil pump 73 sucks the oil stored inside the case CS via the strainer 74 (see FIG. 2). Each of the first oil supply port 3A, the second oil supply port 3B, the third oil supply port 3C, and the fourth oil supply port 3D is connected to the downstream side of the third oil passage 71C, and is connected to the downstream side of the third oil passage 71C. The oil of 71C is distributed and supplied to the first oil supply port 3A, the second oil supply port 3B, the third oil supply port 3C, and the fourth oil supply port 3D.

As shown in FIG. 6, in the present embodiment, the oil in the third oil passage 71C is supplied to the first oil passage 71A. As described above, the sixth supply port 30F and the seventh supply port 30G are formed so as to communicate with the first oil passage 71A, and in the present embodiment, the fourth supply port 30D and the twelfth supply port are further formed. 30L is formed so as to communicate with the first oil passage 71A. Therefore, the oil supplied from the third oil passage 71C to the first oil passage 71A is supplied to the fourth supply port 30D, the sixth supply port 30F, the seventh supply port 30G, and the twelfth supply port 30L. Further, in the present embodiment, the fourth oil passage 71D (see FIGS. 5, 6, and 9) connecting the first oil passage 71A and the second oil passage 71B is formed, and the third oil passage 71C is used. A part of the oil supplied to the first oil passage 71A is supplied to the second oil passage 71B through the fourth oil passage 71D.

The first supply port 30A, the second supply port 30B, and the third supply port 30C are formed so as to communicate with the fourth oil passage 71D (see FIGS. 5 and 9), and are formed from the first oil passage 71A to the first. 4 The oil supplied to the oil passage 71D is supplied to the first supply port 30A, the second supply port 30B, and the third supply port 30C. Further, as described above, the eighth supply port 30H and the ninth supply port 30I are formed so as to communicate with the second oil passage 71B, and in the present embodiment, the fifth supply port 30E and the thirteenth supply port are further formed. The supply port 30M is formed so as to communicate with the second oil passage 71B. Therefore, the oil supplied from the fourth oil passage 71D to the second oil passage 71B is supplied to the fifth supply port 30E, the eighth supply port 30H, the ninth supply port 30I, and the thirteenth supply port 30M. Although details are omitted, the oil of the third oil passage 71C is also supplied to the tenth supply port 30J and the eleventh supply port 30K.

By the way, in the present embodiment, the first rotary electric machine 1A is used in a direction in which the axial direction L intersects the vertical direction. That is, in the present embodiment, the vehicle drive device 100 in which the first rotary electric machine 1A is used is mounted on the vehicle in a direction in which the axial direction L intersects the vertical direction. In the present embodiment, the first rotary electric machine 1A is used in a direction in which the axial direction L is orthogonal to the vertical direction (that is, the direction in which the axial direction L is along the horizontal plane). Unlike such a configuration, the first rotary electric machine 1A is oriented in a direction in which the axial direction L intersects the vertical direction at an angle of less than 90 degrees (that is, the axial direction L is inclined with respect to the horizontal plane). It can also be configured to be used in the direction in which it is used. For example, the first rotary electric machine 1A may be used in a direction in which the axial direction L is inclined with respect to the horizontal plane so as to be directed upward in the vertical direction toward the first side L1 in the axial direction. it can.

In the following description, the vertical direction V (see FIG. 5 and the like) is the vertical direction when the first rotary electric machine 1A is used, that is, the vertical direction when the first rotary electric machine 1A is arranged in the used state. Means. In the present embodiment, the vertical direction V coincides with the vertical direction in the state where the vehicle drive device 100 to which the first rotary electric machine 1A is assembled is mounted on the vehicle. And, "upper" means the upper side of the vertical direction V, and "lower" means the lower side of the vertical direction V.

In the present embodiment, the first step portion 63A is arranged above the first stator core 15A. The first step portion 63A is arranged at a position overlapping the first stator core 15A (here, the outer peripheral surface of the main body portion 16) in the vertical direction (vertical direction along the vertical direction V, the same applies hereinafter). .. As a result, the oil injected from the first oil supply port 3A and hitting the first step surface 64A can be dropped from the first step surface 64A to the first stator core 15A by using gravity. .. As shown in FIGS. 5 and 8, in the present embodiment, the first step portion 63A is arranged at a position overlapping the uppermost portion of the first stator core 15A (here, the uppermost portion of the main body portion 16) in the vertical direction. Has been done. As a result, the oil injected from the first oil supply port 3A and hitting the first step surface 64A can be dropped from the first step surface 64A to or near the uppermost portion of the first stator core 15A. ..

In the present embodiment, the second step portion 63B is arranged above the first coil end portion 18A. The second step portion 63B is arranged at a position overlapping the first coil end portion 18A in the vertical direction. As shown in FIGS. 5 and 7, in the present embodiment, the second step portion 63B is arranged at a position overlapping the uppermost portion of the first coil end portion 18A in the vertical direction. In the first rotary electric machine 1A according to the present disclosure, by arranging the first oil supply port 3A closer to the inside of the radial direction R, it is possible to suppress an increase in the size of the first rotary electric machine 1A in the axial direction. Is possible. When the second step portion 63B is arranged at a position overlapping the uppermost portion of the first coil end portion 18A in the vertical direction, the inside of the radial direction R is on the lower side (see FIG. 5). Then, by arranging the first oil supply port 3A closer to the lower side, the height of the uppermost portion of the first rotary electric machine 1A can be kept low.

As shown in FIG. 9, in the present embodiment, the second oil supply port 3B is arranged above the first coil end portion 18A. The second oil supply port 3B is arranged at a position overlapping the first coil end portion 18A in the vertical direction. As a result, it is possible to drop oil from the second oil supply port 3B to the first coil end portion 18A by utilizing gravity. Further, in the present embodiment, the fourth oil supply port 3D is arranged above the second coil end portion 18B. The fourth oil supply port 3D is arranged at a position overlapping the second coil end portion 18B in the vertical direction. As a result, it is possible to drop oil from the fourth oil supply port 3D to the second coil end portion 18B by utilizing gravity.

As shown in FIG. 9, in the present embodiment, the third oil supply port 3C is arranged above the first stator core 15A. The third oil supply port 3C is arranged at a position overlapping the first stator core 15A (here, the outer peripheral surface of the main body 16) in the vertical direction. As a result, it is possible to drop oil from the third oil supply port 3C to the first stator core 15A by utilizing gravity.

Since the cooling structure of the first stator 11A has the above structure, this cooling structure can be realized without using a tubular member for forming an oil passage, and special processing for the case CS is performed. It is possible to realize without doing. In the present embodiment, the first rotary electric machine 1A and the second rotary electric machine 1B are planes orthogonal to the axial direction L (specifically, the first rotary electric machine 1A and the second rotary electric machine 1B) except for a part. A plane (a plane orthogonal to the axial direction L at the center position of the axial direction L) between the two and the other is a plane of symmetry, and a configuration (shape and arrangement configuration) that is mirror-symmetrical to each other is provided. That is, in the second rotary electric machine 1B, the second rotor 12B corresponding to the first rotor 12A, the second stator 11B corresponding to the first stator 11A, the second stator core 15B corresponding to the first stator core 15A, and the first The third coil end portion 18C corresponding to the coil end portion 18A, the fourth coil end portion 18D corresponding to the second coil end portion 18B, the third case portion CS3 corresponding to the first case portion CS1, and the second case. A fourth case unit CS4 corresponding to the unit CS2 is provided. Although details are omitted, in the present embodiment, the second rotary electric machine 1B has a cooling structure in which the cooling structure of the first stator 11A is inverted in the axial direction L as the cooling structure of the second stator 11B. ..

[Other Embodiments]
Next, other embodiments of the rotary electric machine will be described.

(1) In the above embodiment, the oil passage 71 is continuous from the inside of the first case portion CS1 to the inside of the second case portion CS2 via the mating surface 62 of the first case portion CS1 and the second case portion CS2. As an example, a configuration in which a communication hole 72 for communicating the oil passage 71 and the third oil supply port 3C is formed on the mating surface 62 will be described. However, the present disclosure is not limited to such a configuration, for example, a configuration in which the communication hole 72 is formed in a portion of the first case portion CS1 on the second side L2 in the axial direction with respect to the first joint surface CS1a, or communication. The hole 72 may be formed in a portion of the second case portion CS2 on the first side L1 in the axial direction with respect to the second joint surface CS2a.

(2) In the above embodiment, a configuration in which the inner portion of the second step surface 64B in the radial direction R is arranged so as to overlap the main body portion 16 in the axial direction along the axial direction L has been described as an example. .. However, the present disclosure is not limited to such a configuration, and the entire second stepped surface 64B may be arranged outside the radial direction R with respect to the main body portion 16 in the axial direction.

(3) In the above embodiment, the first rotary electric machine 1A includes a second oil supply port 3B, a third oil supply port 3C, and a fourth oil supply port 3D in addition to the first oil supply port 3A. Was described as an example. However, the present disclosure is not limited to such a configuration, and the first rotary electric machine 1A includes at least one of a second oil supply port 3B, a third oil supply port 3C, and a fourth oil supply port 3D. It is also possible to have no configuration.

(4) In the above embodiment, the differential gear device 6 is a first sun gear S61 which is a first rotating element E1, a second sun gear S62 which is a second rotating element E2, and a carrier which is a third rotating element E3. A configuration of a planetary gear device including C6 and a ring gear R6 as a fourth rotating element E4 has been described as an example. However, the present disclosure is not limited to such a configuration, and a differential gear device 6 having another configuration can also be used. For example, as shown in FIG. 10, the differential gear device 6 includes a first planetary gear mechanism 6A and a second planetary gear mechanism 6B, and the first planetary gear mechanism 6A and the second planetary gear mechanism 6B are , It is also possible to have a configuration in which four rotating elements are provided as a whole and are connected so as to integrally perform a differential operation. In the example shown in FIG. 10, the first planetary gear mechanism 6A and the second planetary gear mechanism 6B are double pinion type planetary gear mechanisms. The carrier of the first planetary gear mechanism 6A and the sun gear of the second planetary gear mechanism 6B connected so as to rotate integrally are the first rotating elements E1, and the ring gear of the first planetary gear mechanism 6A is the first. The ring gear of the second planetary gear mechanism 6B, which is the two-rotating element E2, is the sun gear of the first planetary gear mechanism 6A and the second planetary gear mechanism 6B, which are the third rotating element E3 and are connected so as to rotate integrally. Carrier is the fourth rotating element E4.

(5) In the above embodiment, the differential gear device 6 transmits the rotation of the first input shaft 14A to the first output member 2A and the second output member 2B, and the rotation of the second input shaft 14B is first. The configuration of transmitting to the output member 2A and the second output member 2B has been described as an example. However, the present disclosure is not limited to such a configuration, and as shown by an example in FIG. 11, the power transmission path between the first input shaft 14A and the first output member 2A, and the second input shaft 14B and the first The power transmission path between the two output members 2B is separated, the first input shaft 14A is driven and connected only to the first wheel W1, and the second input shaft 14B is driven and connected only to the second wheel W2. It can also be configured. In the example shown in FIG. 11, the vehicle drive device 100 includes a power transmission device 3 instead of the differential gear device 6, and the power transmission device 3 is a gear that rotates integrally with the first output member 2A. It includes a first output gear 60A that meshes with the first counter output gear 52A, and a second output gear 60B that is a gear that rotates integrally with the second output member 2B and meshes with the second counter output gear 52B.

(6) In the above embodiment, the configuration in which the vehicle drive device 100 includes the first counter gear mechanism 5A and the second counter gear mechanism 5B has been described as an example. However, the present disclosure is not limited to such a configuration, and the vehicle drive device 100 may be configured not to include the first counter gear mechanism 5A and the second counter gear mechanism 5B. In this case, for example, the first input gear 4A may mesh with the first differential input gear 7A, and the second input gear 4B may mesh with the second differential input gear 7B. Further, for example, instead of the first counter gear mechanism 5A, a first idler gear that meshes with both the first input gear 4A and the first differential input gear 7A is provided, and instead of the second counter gear mechanism 5B, a first idler gear is provided. A second idler gear that meshes with both the two input gears 4B and the second differential input gear 7B may be provided.

(7) In the above embodiment, the configuration in which the vehicle drive device 100 includes the second rotary electric machine 1B has been described as an example. However, the present disclosure is not limited to such a configuration, and as shown by an example in FIG. 12, the vehicle drive device 100 may be configured not to include the second rotary electric machine 1B.

In the example shown in FIG. 12, the rotary electric machine 1 corresponds to the first rotary electric machine 1A in the above embodiment, the stator 11 corresponds to the first stator 11A in the above embodiment, and the rotor 12 corresponds to the first in the above embodiment. 1 Rotor 12A, rotor shaft 13 corresponds to the first rotor shaft 13A in the above embodiment, input shaft 14 corresponds to the first input shaft 14A in the above embodiment, and input gear 4 corresponds to the above embodiment. The counter gear mechanism 5 corresponds to the first counter gear mechanism 5A in the above embodiment, and the counter input gear 51 corresponds to the first counter input gear 51A in the above embodiment. , The counter output gear 52 corresponds to the first counter output gear 52A in the above embodiment, the counter shaft 53 corresponds to the first counter shaft 53A in the above embodiment, and the differential input gear 7 corresponds to the above embodiment. It corresponds to the first differential input gear 7A. Then, in the example shown in FIG. 12, the differential gear device 6 is configured to transmit the rotation of the input shaft 14 driven and connected to the rotary electric machine 1 to the first output member 2A and the second output member 2B. ..

Although details are omitted, in the example shown in FIG. 12, the differential gear device 6 is driven and connected to the first output rotating element 2A and the input shaft 14 in the order of rotation speed. It includes an input rotating element and a second output rotating element that is driven and connected to the second output member 2B. For example, the differential gear device 6 is a ring gear which is an input rotating element, a sun gear which is one of the first output rotating element and the second output rotating element, and the other of the first output rotating element and the second output rotating element. It can be configured to be a double pinion type planetary gear device including a carrier. Even when the vehicle drive device 100 does not include the second rotary electric machine 1B in this way, as described above, the input gear 4 is configured to mesh with the differential input gear 7 without the counter gear mechanism 5. Alternatively, instead of the counter gear mechanism 5, an idler gear that meshes with both the input gear 4 and the differential input gear 7 may be provided. Further, when the vehicle drive device 100 does not include the second rotary electric machine 1B in this way, the vehicle drive device 100 does not include the differential gear device 6, and the vehicle drive device 100 is not a pair of left and right wheels. It may be configured to drive one wheel.

(8) In the above embodiment, the rotary electric machine according to the present disclosure drives a vehicle (electric vehicle) in which only the rotary electric machine (two rotary electric machines in the above embodiment) is mounted as a driving force source for the wheels. Although the case of being used in the vehicle drive device of the above is described as an example, the rotary electric machine according to the present disclosure can be used to drive a vehicle (hybrid vehicle) in which both the rotary electric machine and the internal combustion engine are mounted as a driving force source for wheels, for example. It can also be used as a vehicle drive device for this purpose. The internal combustion engine is a prime mover (for example, a gasoline engine, a diesel engine, etc.) that is driven by combustion of fuel inside the engine to extract power.

(9) In the above embodiment, the case where the rotary electric machine according to the present disclosure is used as a driving force source for wheels has been described as an example, but the rotary electric machine according to the present disclosure is used as a driving force for a driving object other than wheels. It can also be used as a source. That is, the rotary electric machine according to the present disclosure may be used for a device or device other than the vehicle drive device.

(10) The configurations disclosed in each of the above-described embodiments shall be applied in combination with the configurations disclosed in the other embodiments as long as there is no contradiction (the embodiments described as the other embodiments are used). (Including combinations) is also possible. With respect to other configurations, the embodiments disclosed herein are merely exemplary in all respects. Therefore, various modifications can be made as appropriate without departing from the gist of the present disclosure.

[Outline of the above-described embodiment]
Hereinafter, the outline of the rotary electric machine described above will be described.

The rotor (12,12A), the stator (11,11A) arranged outside the rotor (12,12A) in the radial direction (R), the rotor (12,12A), and the stator (11,12A). A rotary electric machine (1,1A) including a case (CS) for accommodating 11A), and the case (CS) is outside the radial direction (R) with respect to the stator (11,11A). The stator (11, 11A) includes a peripheral wall portion (60) that surrounds the outer peripheral surface of the stator (11, 11A), and the stator (11, 11A) includes a cylindrical main body portion (16) that extends in the axial direction (L). The peripheral wall portion (15A) is provided with a stator core (15A) and a coil end portion (18A) projecting from the stator core (15A) to the first side (L1) in the axial direction, which is one side of the axial direction (L). A first stepped surface (64A) facing the first axial side (L1) is placed at a position overlapping the stator core (15A) in a radial direction along the radial direction (R) on the inner surface (61) of 60). A first step portion (63A) to be provided is formed, and an axial first side (L1) opposite to the axial first side (L1) in the axial direction (L) is formed on the inner surface (61) of the peripheral wall portion (60). A second step portion (63B) including a second step surface (64B) facing the second side (L2) is formed, opens in the second step surface (64B), and faces the first step surface (64A). It is provided with a first oil supply port (3A) for injecting oil.

According to this configuration, the oil injected from the first oil supply port (3A) is applied to the first stepped surface (64A) arranged at a position overlapping the stator core (15A) in the radial direction, and the stator core is applied from there. By supplying to (15A), the stator core (15A) can be cooled. By configuring the oil to be supplied to the stator core (15A) in this way, the first oil supply port (3A) can be provided at a position different from that of the stator core (15A) in the axial direction (L). Therefore, it is easier to arrange the first oil supply port (3A) inside the radial direction (R) as compared with the case where the first oil supply port (3A) is provided at a position overlapping the stator core (15A) in the radial direction. This makes it possible to appropriately cool the stator (11, 11A) while suppressing an increase in the size of the rotary electric machine (1, 1A) in the axial direction.

Here, the diameter of the outer peripheral surface of the coil end portion (18A) is smaller than the diameter of the outer peripheral surface of the main body portion (16), and the second step portion (63B) is the inner surface (60) of the peripheral wall portion (60). It is preferable that the coil end portion (18A) is formed at a position overlapping the coil end portion (18A) in the radial direction in 61).

According to this configuration, the axial dimension of the rotary electric machine (1,1A) can be reduced by forming the second step portion (63B) at a position overlapping the coil end portion (18A) in the radial direction. Can be done. In this configuration, the diameter of the outer peripheral surface of the coil end portion (18A) is smaller than the diameter of the outer peripheral surface of the main body portion (16) included in the stator core (15A). Therefore, even when the second step portion (63B) is formed at a position overlapping the coil end portion (18A) in the radial direction as described above, the first oil supply port (3A) is radially (R). By arranging them closer to the inside of the coil, it is possible to suppress an increase in the size of the rotary electric machine (1,1A) in the axial direction.

Further, the inner portion of the second step surface (64B) in the radial direction (R) is arranged so as to overlap the main body portion (16) in the axial direction along the axial direction (L). Is suitable.

According to this configuration, the entire second stepped surface (64B) is arranged outside the radial direction (R) with respect to the main body portion (16) in the axial direction, as compared with the case where the first oil supply port is arranged. (3A) is easily formed inside the radial direction (R). Therefore, it becomes easy to suppress an increase in the size of the rotary electric machine (1,1A) in the axial direction.

In addition, a second opening is opened at a position overlapping the coil end portion (18A) in the radial direction on the inner surface (61) of the peripheral wall portion (60), and oil is supplied toward the coil end portion (18A). It is preferable to provide an oil supply port (3B).

According to this configuration, the coil end portion (18A) can be cooled by supplying oil (for example, by dropping) from the second oil supply port (3B) to the coil end portion (18A). In the rotary electric machine (1,1A) of the present disclosure, as described above, the first oil is opened so as to open to the second stepped surface (64B) arranged at a position overlapping the coil end portion (18A) in the radial direction. A supply port (3A) is provided. In this configuration, the second oil supply port (3B) is provided at a position overlapping the coil end portion (18A) in the radial direction. Therefore, it is easy to form a supply oil passage for supplying oil to the second oil supply port (3B) by using the supply oil passage for supplying oil to the first oil supply port (3A). By sharing a part of these two supply oil passages, it is possible to reduce the size of the rotary electric machine (1,1A).

Further, an oil passage (71) extending along the axial direction (L) is formed in the peripheral wall portion (60), and the stator core (15A) is viewed in the radial direction on the inner surface (61) of the peripheral wall portion (60). It is preferable to provide a third oil supply port (3C) that opens at a position overlapping the above and communicates with the oil passage (71).

According to this configuration, the stator core (15A) is also cooled by supplying the oil in the oil passage (71) from the third oil supply port (3C) to the stator core (15A) (for example, by dropping). Therefore, the cooling performance of the stator core (15A) can be improved. In this configuration, an oil passage (71) for supplying oil to the third oil supply port (3C) is formed in the peripheral wall portion (60). Therefore, for example, a tubular member for forming an oil passage is arranged so as to extend in the radial direction (R) with respect to the peripheral wall portion (60) along the axial direction (L), and the tubular member has a first position. Compared with the case where the three oil supply ports (3C) are provided, it is easy to suppress the increase in size of the peripheral wall portion (60) in the radial direction (R). Therefore, it is possible to provide an oil passage (71) for supplying oil to the third oil supply port (3C) while suppressing an increase in the size of the rotary electric machine (1,1A) in the axial direction.

In the configuration including the third oil supply port (3C) as described above, the opening is made at a position overlapping the coil end portion (18A) in the radial view on the inner surface (61) of the peripheral wall portion (60). A second oil supply port (3B) for supplying oil toward the coil end portion (18A) is provided, and the stator core (15A) is located outside the radial direction (R) with respect to the main body portion (16). The projecting portion (17) is provided, and the first oil supply port (3A), the second oil supply port (3B), and the third oil supply port (3C) are the same as the projecting portion (17). It is preferable that they are arranged in a circular shape.

According to this configuration, the first oil supply port (3A), the second oil supply port (3B), and the third oil supply port (3C) are aligned with the protrusion (17) in the circumferential direction (C). Can be placed. Therefore, it is possible to reduce the size of the rotary electric machine (1,1A) in the axial direction.

As described above, the first oil supply port (3A), the second oil supply port (3B), and the third oil supply port (3C) are arranged in the same circumferential circle as the protruding portion (17). The first oil supply port (3A), the second oil supply port (3B), and the third oil supply port (3C) are on the inner peripheral side of the outermost peripheral portion of the protruding portion (17). It is preferable that it is arranged in.

According to this configuration, it is possible to further reduce the size of the rotary electric machine (1,1A) in the axial direction.

In the configuration including the third oil supply port (3C) communicating with the oil passage (71) as described above, the case (CS) includes the first case portion (CS1) and the first case portion (CS1). The oil passage (71) is provided with a second case portion (CS2) arranged on the first side (L1) in the axial direction and joined to the first case portion (CS1). Continuous from the inside of the first case portion (CS1) to the inside of the second case portion (CS2) via the mating surface (62) between the first case portion (CS1) and the second case portion (CS2). It is preferable that the mating surface (62) is formed with a communication hole (72) for communicating the oil passage (71) and the third oil supply port (3C).

According to this configuration, the communication hole (72) for supplying oil from the oil passage (71) formed in the peripheral wall portion (60) to the third oil supply port (3C) is processed for the peripheral wall portion (60). Can be formed on the mating surface (62), which is relatively easy. Therefore, the manufacturing cost of the rotary electric machine (1,1A) can be reduced.

The rotary electric machine according to the present disclosure may be capable of exerting at least one of the above-mentioned effects.

1: Rotary machine 1A: 1st rotary machine (rotary machine)
3A: 1st oil supply port 3B: 2nd oil supply port 3C: 3rd oil supply port 11: Stator 11A: 1st stator (stator)
12: Rotor 12A: First rotor (rotor)
15A: First stator core (stator core)
16: Main body 17: Protruding 18A: First coil end (coil end)
60: Peripheral wall portion 61: Inner surface 62: Matching surface 63A: First step portion 63B: Second step portion 64A: First step surface 64B: Second step surface 71: Oil passage 72: Communication hole CS: Case CS1: First Case part CS2: Second case part L: Axial direction L1: Axial direction first side L2: Axial direction second side R: Radial direction

Claims (8)

A rotary electric machine including a rotor, a stator arranged radially outside the rotor, and a case for accommodating the rotor and the stator.
The case includes a peripheral wall portion that is arranged on the outer side in the radial direction with respect to the stator and surrounds the outer peripheral surface of the stator.
The stator includes a stator core having a cylindrical main body extending in the axial direction, and a coil end portion protruding from the stator core to the first side in the axial direction, which is one side in the axial direction.
A first step portion having a first step surface facing the first side in the axial direction is formed at a position overlapping the stator core in a radial direction along the radial direction on the inner surface of the peripheral wall portion.
A second step portion having a second step surface facing the second side in the axial direction, which is opposite to the first side in the axial direction in the axial direction, is formed on the inner surface of the peripheral wall portion.
A rotary electric machine provided with a first oil supply port that opens in the second stepped surface and injects oil toward the first stepped surface. The diameter of the outer peripheral surface of the coil end portion is smaller than the diameter of the outer peripheral surface of the main body portion.
The rotary electric machine according to claim 1, wherein the second step portion is formed at a position overlapping the coil end portion in the radial direction on the inner surface of the peripheral wall portion. The rotary electric machine according to claim 1 or 2, wherein the inner portion of the second stepped surface in the radial direction is arranged so as to overlap the main body portion in an axial direction along the axial direction. Any of claims 1 to 3, further comprising a second oil supply port that opens at a position overlapping the coil end portion on the inner surface of the peripheral wall portion in the radial direction and supplies oil toward the coil end portion. The rotary electric machine described in item 1. An oil passage extending along the axial direction is formed in the peripheral wall portion.
The rotary electric machine according to any one of claims 1 to 4, further comprising a third oil supply port that opens at a position overlapping the stator core on the inner surface of the peripheral wall portion in the radial direction and communicates with the oil passage. .. A second oil supply port that opens at a position overlapping the coil end portion on the inner surface of the peripheral wall portion in the radial direction and supplies oil toward the coil end portion is provided.
The stator core includes a protrusion that projects outward in the radial direction with respect to the main body.
The rotary electric machine according to claim 5, wherein the first oil supply port, the second oil supply port, and the third oil supply port are arranged in a circular shape on the same circumference as the protruding portion. The rotary electric machine according to claim 6, wherein the first oil supply port, the second oil supply port, and the third oil supply port are arranged on the inner peripheral side from the outermost peripheral portion of the protruding portion. The case includes a first case portion and a second case portion that is arranged on the first side in the axial direction with respect to the first case portion and is joined to the first case portion.
The oil passage is continuously formed from the inside of the first case portion to the inside of the second case portion through the mating surface of the first case portion and the second case portion.
The rotary electric machine according to any one of claims 5 to 7, wherein a communication hole for communicating the oil passage and the third oil supply port is formed on the mating surface.

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