JP2022030818A - Drive unit for vehicle - Google Patents

Abstract

To establish a cooling water channel in a case member at a relatively low cost.SOLUTION: There is disclosed a drive unit for a vehicle that comprises: a rotor; a stator; a case member that forms a first chamber in which the rotor and the stator are accommodated and is adjacent to the stator in a radial direction; and a first cover member that is attached to a first side in an axial direction of the case member and covers the first chamber. The case member is formed with a cooling water channel including a plurality of axial water channels. In the plurality of axial water channels, an opening on the first side in the axial direction is opposite to the first cover member in the axial direction, and an end on a second side opposite to the first side in the axial direction is closed by a portion of the case member.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a vehicle drive device.

A cylindrical stator housing (case member) having a cooling water channel continuous in the circumferential direction while repeating meandering is known.

Japanese Unexamined Patent Publication No. 2012-24675

However, in the above-mentioned conventional technique, it is necessary to attach a housing cover (cover member) for closing the axial end portion of the cooling water channel to both ends in the axial direction of the case member, and accordingly, it is necessary to attach the housing cover (cover member). There is a problem that bolts, seals, etc. associated with the connection of the cover member to the case member are separately required, which leads to an increase in assembly man-hours and costs.

Therefore, on one aspect, the present disclosure aims to establish a cooling water channel in the case member at a relatively low cost.

On one side, it is a vehicle drive, including a rotary electric machine.
The rotary electric machine is
With a rotor having a rotor shaft and a rotor core,
With a stator having a stator core and coil,
A case member that forms a first chamber in which the rotor and the stator are housed and is radially adjacent to the stator.
A first cover member, which is attached to the first side in the axial direction of the case member and covers the first chamber, is provided.
A cooling water channel is formed in the case member.
The cooling water channel extends axially around the rotation axis of the rotary electric machine in the case member from the end on the first side in the axial direction to the end on the second side opposite to the first side. Includes multiple axial channels to
The plurality of axial waterways communicate with each other at the first side end portion or the second side end portion in the axial direction, and the first cover member is opened while the first side end portion in the axial direction is opened. Provided is a vehicle drive device that faces axially and has its second end in the axial direction closed by a portion of the case member.

On one side, according to the present disclosure, it is possible to establish a cooling water channel in the case member at a relatively low cost.

It is a figure which shows an example of the whole structure of a motor drive system. It is sectional drawing which shows the structure of the drive device for a vehicle by Example 1. FIG. It is a skeleton diagram of a drive device for a vehicle. It is a perspective view which shows the appearance of the case schematically. It is a schematic cross-sectional view perpendicular to the axial direction of a vehicle drive device. It is a figure which shows typically the flow of oil in the cross-sectional view shown in FIG. It is explanatory drawing of the cooling water channel, and is the perspective view of the case member. It is explanatory drawing of the cooling water channel, and is the perspective view of the case member which cut off a part of the outer wall part. It is explanatory drawing of the cooling water channel, and is the perspective view of the case member which cut off a part of the outer wall part with the 2nd partition wall part arranged. It is a perspective view of the 2nd partition wall part. It is a schematic plan view when the cooling water channel is developed in the circumferential direction. FIG. 3 is a schematic cross-sectional view taken along the line CC of FIG. The figure shown in FIG. 8 is a diagram schematically showing the flow of cooling water. It is a figure which shows schematic about the whole structure about the cooling structure of the drive device for a vehicle. It is sectional drawing which shows the structure of the drive device for a vehicle by Example 2. FIG.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings.

Here, first, prior to the description of the vehicle drive device according to the present embodiment, first, the motor drive system SM for an electric vehicle to which the vehicle drive device according to the present embodiment is preferably applied will be described. In the description of FIG. 1 regarding the motor drive system SM for an electric vehicle, the term "connection" between various elements means "electrical connection" unless otherwise specified.

FIG. 1 is a diagram showing an example of the overall configuration of the motor drive system SM. The motor drive system SM is a system that drives a vehicle by driving a rotary electric machine 1 using the electric power of a high-voltage battery HB. As long as the electric vehicle is driven by driving the rotary electric machine 1 using electric power, the details of its method and configuration are arbitrary. The electric vehicle typically includes a hybrid vehicle whose power source is an engine and a rotary electric machine 1, and an electric vehicle whose power source is only a rotary electric machine 1. Hereinafter, the vehicle refers to a vehicle equipped with a motor drive system SM, unless otherwise specified.

As shown in FIG. 1, the motor drive system SM includes a high-voltage battery HB (an example of a power source), a smoothing capacitor SC, an inverter IV (an example of a power converter), a rotary electric machine 1, and an inverter control device 6A.

The high-voltage battery HB is an arbitrary power storage device that stores electric power and outputs a DC voltage, and may include a capacitive element such as a nickel hydrogen battery, a lithium ion battery, or an electric double-layer capacitor. The high voltage battery HB is typically a battery having a rated voltage of more than 100V, for example having a rated voltage of 288V.

The inverter IV includes U-phase, V-phase, and W-phase arms arranged in parallel with each other between the positive electrode line and the negative electrode line. The U-phase arm includes a series connection of switching elements (IGBT: Insulated Gate Bipolar Transistor) Q1 and Q2 in this example, and a V-phase arm includes a series connection of switching elements (IGBT) Q3 and Q4 in this example, and a W-phase arm. Includes a series connection of switching elements (IGBTs in this example) Q5, Q6. Further, diodes D11 to D16 are arranged between the collectors and emitters of the switching elements Q1 to Q6 so as to allow a current to flow from the emitter side to the collector side, respectively. Note that the switching elements Q1 to Q6 may be switching elements other than the IGBT, such as a MOSFET (methal index semiconductor device field-effect transistor).

The rotary electric machine 1 is, for example, a three-phase AC motor, and one end of three coils 110 of U, V, and W phases is commonly connected at a neutral point. The other end of the U-phase coil is connected to the midpoint M1 of the switching elements Q1 and Q2, the other end of the V-phase coil is connected to the midpoint M2 of the switching elements Q3 and Q4, and the other end of the W-phase coil is. It is connected to the midpoint M3 of the switching elements Q5 and Q6. A smoothing capacitor SC is connected between the collector of the switching element Q1 and the negative electrode line.

Various sensors such as a current sensor (not shown) for detecting the current flowing through the rotary electric machine 1 are connected to the inverter control device 6A. The inverter control device 6A controls the inverter IV based on the sensor information from various sensors. The inverter control device 6A includes, for example, a CPU, a ROM, a main memory (all not shown), and various functions of the inverter control device 6A are such that a control program recorded in the ROM or the like is read out to the main memory by the CPU. It is realized by being executed. The control method of the inverter IV is arbitrary, but basically, the two switching elements Q1 and Q2 related to the U phase are turned on / off in opposite phases, and the two switching elements Q3 and Q4 related to the V phase are turned on and off. It turns on / off in opposite phase to each other, and the two switching elements Q5 and Q6 related to the W phase turn on / off in opposite phase to each other.

In the example shown in FIG. 1, the motor drive system SM includes a single rotary electric machine 1, but may include an additional motor (including a generator). In this case, the additional motor (s) may be connected to the high voltage battery HB in parallel with the rotary electric machine 1 and the inverter IV together with the corresponding inverter. Further, in the example shown in FIG. 1, the motor drive system SM does not include a DC / DC converter, but a DC / DC converter may be provided between the high voltage battery HB and the inverter IV.

As shown in FIG. 1, a cutoff switch SW1 for cutting off the power supply from the high-voltage battery HB is provided between the high-voltage battery HB and the smoothing capacitor SC. The cutoff switch SW1 may be composed of a semiconductor switch, a relay, or the like. The cutoff switch SW1 is normally on, and is turned off, for example, when a vehicle collision is detected. The on / off switching of the cutoff switch SW1 may be realized by the inverter control device 6A or may be realized by another control device.

FIG. 2 is a cross-sectional view showing a configuration of a vehicle drive device 100 according to an embodiment (Example 1). FIG. 2 is a cross-sectional view taken along the axial direction of the vehicle drive device 100, and is a portion P1 to P3 cut locally in another cross section (a cross section having a different position in the vertical direction on the paper surface) for explanation of the oil passage structure 90. Is also shown. FIG. 3 is a skeleton diagram of the vehicle drive device 100.

The vehicle drive device 100 includes a rotary electric machine 1 that is a drive force source for the wheels, and a drive transmission mechanism 10 provided in a power transmission path connecting the rotary electric machine 1 and the wheels W. In this embodiment, as an example, the rotary electric machine 1 and the drive transmission mechanism 10 are housed in the case 2. Further, in this embodiment, as an example, the drive transmission mechanism 10 includes an input member 3, a counter gear mechanism 4, a differential gear mechanism 5, and a first output member 61 and a second output member 62.

The rotary electric machine 1 is arranged on the first axis A1 as its rotation axis center. In this embodiment, as an example, the input member 3 is also arranged on the first axis A1. The counter gear mechanism 4 is arranged on the second axis A2 as its rotation axis center. The differential gear mechanism 5 is arranged on the third axis A3 as its rotation axis. In this embodiment, as an example, the first output member 61 and the second output member 62 are also arranged on the third axis A3. The first axis A1, the second axis A2, and the third axis A3 are virtual axes different from each other and are arranged in parallel with each other.

In the following description, the direction parallel to the axes A1 to A3 is referred to as the "axial direction L" of the vehicle drive device 100. Then, in the axial direction L, the side on which the rotary electric machine 1 is arranged with respect to the input member 3 is referred to as the "axial first side L1" (an example of the first side), and the opposite side is referred to as the "axial second side L2". "(An example of the second side). Further, the direction orthogonal to each of the first axis A1, the second axis A2, and the third axis A3 is defined as the "diameter direction R" with respect to 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, it may be simply described as "diameter direction R".

In this embodiment, as an example, the case 2 includes a case member 21, a first cover member 22, and a second cover member 23. The case member 21 is formed in a cylindrical shape that surrounds the outside of the rotary electric machine 1 and the drive transmission mechanism 10 in the radial direction R. The first cover member 22 and the second cover member 23 are formed so as to extend along the radial direction R. The first cover member 22 is fixed to the end of the axial first side L1 of the case member 21 so as to close the opening of the axial first side L1 of the case member 21. The second cover member 23 is fixed to the end of the second side L2 in the axial direction of the case member 21 so as to close the opening of the second side L2 in the axial direction of the case member 21.

In this embodiment, the case member 21 forms a partition wall portion 24 together with a peripheral wall portion, and is realized by a one-piece case member. The first cover member 22 is realized by one piece, and the second cover member 23 is realized by one piece. In this way, in this embodiment, the case 2 is formed of substantially three pieces of members. As a result, the number of pieces of the case member can be reduced and the cost can be reduced efficiently as compared with the conventional technique as described in Patent Document 1 described above.

The partition wall portion 24 of the case member 21 is a space inside the radial direction R of the case member 21, and the space between the first cover member 22 and the second cover member 23 is pivoted to the two chambers SP1 and SP2. It is formed so as to partition in the direction L. In this embodiment, as an example, the rotary electric machine 1 is arranged in the chamber SP1 (an example of the first chamber) between the partition wall portion 24 and the first cover member 22. The drive transmission mechanism 10 is arranged in the chamber SP2 (an example of the second chamber) between the partition wall portion 24 and the second cover member 23.

The rotary electric machine 1 has a stator 11 and a rotor 12. The term "rotary electric machine" is used as a concept including any of a motor (motor), a generator (generator), and, if necessary, a motor / generator that functions as both a motor and a generator.

The stator 11 has a stator core 111 fixed to a non-rotating member (eg, case 2). The rotor 12 has a rotor core 121 rotatable with respect to the stator 11 (stator core 111) and a rotor shaft 122 connected so as to rotate integrally with the rotor core 121. In this embodiment, as an example, the rotary electric machine 1 is a rotary field type rotary electric machine. Therefore, the coil 110 is wound around the stator core 111 so that coil end portions 112 projecting from the stator core 111 on both sides in the axial direction L (L1 on the first side in the axial direction and L2 on the second side in the axial direction) are formed. Will be done. A permanent magnet 123 is provided on the rotor core 121. Further, in this embodiment, as an example, since the rotary electric machine 1 is an inner rotor type rotary electric machine, the rotor core 121 is arranged inside the stator core 111 in the radial direction R. Then, the rotor shaft 122 is connected to the inner peripheral surface of the rotor core 121.

The rotor shaft 122 rotates around the first axis A1. The rotor shaft 122 is formed in a cylindrical shape extending along the axial direction L. In this embodiment, as an example, the rotor shaft 122 is rotatably supported with respect to the case 2 via the first rotor bearing B1a and the second rotor bearing B1b. Specifically, the end portion of the rotor shaft 122 on the first side L1 in the axial direction is rotatably supported with respect to the first cover member 22 of the case 2 via the first rotor bearing B1a. Then, the end portion of the rotor shaft 122 on the second side L2 in the axial direction is rotatably supported with respect to the partition wall portion 24 via the second rotor bearing B1b. Further, in this embodiment, as an example, the rotor shaft 122 has both end faces in the axial direction L open. The internal space of the rotor shaft 122 functions as a rotor shaft oil passage 122a through which oil flows.

The input member 3 is an input element of the drive transmission mechanism 10. The input member 3 has an input shaft 31 and an input gear 32.

The input shaft 31 is a rotating member that rotates around the first shaft A1. The input shaft 31 is formed so as to extend along the axial direction L. In this embodiment, as an example, the input shaft 31 is inserted into a through hole that penetrates the partition wall portion 24 in the axial direction L. Then, the end portion of the input shaft 31 on the first side in the axial direction L1 is connected to the end portion of the rotor shaft 122 on the second side in the axial direction L2. In the illustrated example, the end of the axial first side L1 of the input shaft 31 is the end of the axial second side L2 of the rotor shaft 122 so that the input shaft 31 is located inside the radial direction R of the rotor shaft 122. It is inserted into the portions and these ends are connected to each other by spline engagement.

In this embodiment, as an example, the input shaft 31 is rotatably supported with respect to the case 2 via the first input bearing B3a and the second input bearing B3b. Specifically, in the input shaft 31, the portion of the input shaft 31 on the first side L1 in the axial direction from the central portion in the axial direction L1 and the portion L2 on the second side in the axial direction from the connection portion with the rotor shaft 122 is the second portion. 1 It is rotatably supported with respect to the partition wall portion 24 via the input bearing B3a. Then, the end portion of the second side L2 in the axial direction of the input shaft 31 is rotatably supported with respect to the second cover member 23 via the second input bearing B3b.

Further, in the present embodiment, as an example, the input shaft 31 is formed in a cylindrical shape in which the end face of the second side L2 in the axial direction is open. The internal space of the input shaft 31 functions as an input shaft oil passage 31a through which oil from the mechanical hydraulic pump 71 flows.

The input gear 32 is a gear that transmits the driving force from the rotary electric machine 1 to the counter gear mechanism 4. The input gear 32 is connected to the input shaft 31 so as to rotate integrally with the input shaft 31. In this embodiment, as an example, the input gear 32 is integrally formed with the input shaft 31. Further, in this embodiment, as an example, the input gear 32 is arranged between the first input bearing B3a and the second input bearing B3b.

The counter gear mechanism 4 is arranged between the input member 3 and the differential gear mechanism 5 in the power transmission path. The counter gear mechanism 4 has a counter shaft 41, a first counter gear 42, and a second counter gear 43.

The counter shaft 41 is a rotating member that rotates around the second shaft A2. The counter shaft 41 is formed so as to extend along the axial direction L. In this embodiment, as an example, the counter shaft 41 is rotatably supported with respect to the case 2 via the first counter bearing B4a and the second counter bearing B4b. Specifically, the end portion of the counter shaft 41 on the first side L1 in the axial direction is rotatably supported with respect to the partition wall portion 24 via the first counter bearing B4a. Then, the end portion of the second side L2 in the axial direction of the counter shaft 41 is rotatably supported with respect to the second cover member 23 via the second counter bearing B4b.

In this embodiment, as an example, the counter shaft 41 is formed in a cylindrical shape in which both end faces in the axial direction L are open. The internal space of the counter shaft 41 functions as a counter shaft oil passage 41a through which oil from the mechanical hydraulic pump 71 flows.

The first counter gear 42 is an input element of the counter gear mechanism 4. The first counter gear 42 meshes with the input gear 32 of the input member 3. The first counter gear 42 is connected to the counter shaft 41 so as to rotate integrally with the counter shaft 41. In this embodiment, as an example, the first counter gear 42 is connected to the counter shaft 41 by spline engagement. Further, in this embodiment, as an example, the first counter gear 42 is arranged between the first counter bearing B4a and the second counter bearing B4b, and is arranged on the first side L1 in the axial direction with respect to the second counter gear 43. Will be done. However, in the modified example, the first counter gear 42 may be arranged between the first counter bearing B4a and the second counter bearing B4b and on the second side L2 in the axial direction with respect to the second counter gear 43. (See FIG. 3).

The second counter gear 43 is an output element of the counter gear mechanism 4. In this embodiment, as an example, the second counter gear 43 is formed to have a smaller diameter than the first counter gear 42. The second counter gear 43 is connected to the counter shaft 41 so as to rotate integrally with the counter shaft 41. In this embodiment, as an example, the second counter gear 43 is integrally formed with the counter shaft 41.

The differential gear mechanism 5 distributes the driving force transmitted from the rotary electric machine 1 side to the first output member 61 and the second output member 62. The differential gear mechanism 5 includes a differential input gear 51, a differential case 52, a pinion shaft 53, a pair of pinion gears 54, and a first side gear 55 and a second side gear 56. In this embodiment, as an example, the pair of pinion gears 54, and the first side gear 55 and the second side gear 56 are all bevel gears.

The differential input gear 51 is an input element of the differential gear mechanism 5. The differential input gear 51 meshes with the second counter gear 43 of the counter gear mechanism 4. The differential input gear 51 is connected to the differential case 52 so as to rotate integrally with the differential case 52. In this embodiment, as an example, the rotary electric machine 1 is arranged on the first side L1 in the axial direction with respect to the differential input gear 51.

The differential case 52 is a rotating member that rotates around the third axis A3. In this embodiment, as an example, the differential case 52 is rotatably supported with respect to the case 2 via the first differential bearing B5a and the second differential bearing B5b. Specifically, the end portion of the differential case 52 on the first side L1 in the axial direction is rotatably supported with respect to the partition wall portion 24 via the first differential bearing B5a. Then, the end portion of the second side L2 in the axial direction of the differential case 52 is rotatably supported with respect to the second cover member 23 via the second differential bearing B5b.

The differential case 52 is a hollow member. Inside the differential case 52, a pinion shaft 53, a pair of pinion gears 54, and a first side gear 55 and a second side gear 56 are housed.

The pinion shaft 53 extends along the radial direction R with respect to the third axis A3. The pinion shaft 53 is inserted into a pair of pinion gears 54 and rotatably supports them. The pinion shaft 53 is arranged so as to penetrate the differential case 52. The pinion shaft 53 is locked to the differential case 52 by, for example, a locking member 58 in the form of a rod-shaped pin, and rotates integrally with the differential case 52.

The pair of pinion gears 54 are attached to the pinion shaft 53 in a state of facing each other at a distance along the radial direction R with respect to the third axis A3. The pair of pinion gears 54 are configured to be rotatable (rotate) about the pinion shaft 53 and rotate (revolve) about the third axis A3.

The first side gear 55 and the second side gear 56 are rotating elements after distribution in the differential gear mechanism 5. The first side gear 55 and the second side gear 56 are arranged so as to face each other with the pinion shaft 53 interposed therebetween at a distance from each other in the axial direction L. The first side gear 55 is arranged on the first side L1 in the axial direction with respect to the second side gear 56. The first side gear 55 and the second side gear 56 are configured to rotate in the circumferential direction in the internal space of the differential case 52, respectively. The first side gear 55 and the second side gear 56 mesh with a pair of pinion gears 54. The first side gear 55 is connected so as to rotate integrally with the first output member 61. On the other hand, the second side gear 56 is connected so as to rotate integrally with the second output member 62.

Each of the first output member 61 and the second output member 62 is driven and connected to the wheel W. Each of the first output member 61 and the second output member 62 transmits the driving force distributed by the differential gear mechanism 5 to the wheel W.

In this embodiment, as an example, the first output member 61 includes a first axle 611. The first axle 611 is driven and connected to the wheel W on the first side L1 in the axial direction. The first axle 611 is connected so as to rotate integrally with the first side gear 55. A relay member (not shown) may be provided between the first axle 611 and the first side gear 55.

Further, in this embodiment, as an example, the second output member 62 includes the second axle 621. The second axle 621 is driven and connected to the wheel W on the second side L2 in the axial direction. The second axle 621 is connected so as to rotate integrally with the second side gear 56.

Next, the arrangement of the inverter module MJ and the electrical connection structure between the inverter module MJ and the rotary electric machine 1 will be described with reference to FIGS. 4 and 5 together with FIG.

FIG. 4 is a perspective view schematically showing the appearance of the case 2, and FIG. 5 is a schematic cross-sectional view perpendicular to the axial direction L of the vehicle drive device 100, in which the chamber SP2 viewed from the L2 side to the L1 side. It is a cross-sectional view through. In the description of FIG. 4, the vertical direction of the vehicle drive device 100 mounted on the vehicle is referred to as “vertical direction V”. The position on the upper side (V1 side) of the vertical direction V is represented by using "upper" such as above and the upper end, and the position on the lower side (V2 side) of the vertical direction V is represented by, for example, the lower side. It is expressed using "bottom" such as the lower end. Further, the direction orthogonal to the axial direction L when viewed in the vertical direction V is defined as the "depth direction D". Then, in the depth direction D, the side of the differential gear mechanism 5 with respect to the rotary electric machine 1 is referred to as the "D1 side", and the opposite side thereof is referred to as the "D2 side". The D1 side corresponds to, for example, the front side of the vehicle, but may correspond to the rear side of the vehicle.

In this embodiment, as an example, the case 2 includes an inverter case portion 2a. The inverter case portion 2a may be integrally formed with the case 2. That is, the inverter case portion 2a may be integrally formed with the case member 21 in such a manner that the inverter case portion 2a is partitioned by the side wall portion of the case member 21 forming the chamber SP1 in which the rotary electric machine 1 is housed. Alternatively, a part or all of the inverter case portion 2a is separate from the case member 21, and may be attached to the case member 21.

As shown in FIG. 4, the inverter case portion 2a is arranged on the upper part of the case 2. The inverter module MJ is housed in the inverter case portion 2a. The inverter module MJ is a module incorporating the above-mentioned inverter IV, the inverter control device 6A, and the like, and may further incorporate a smoothing capacitor SC. The inverter case portion 2a is preferably closed to the outside by the lid member 25. That is, the inverter case portion 2a forms a closed space, and the inverter module MJ is arranged in the space. As a result, EMC (Electromagnetic Compatibility) measures related to the inverter module MJ can be appropriately realized, and problems such as spatial resonance can be reduced.

The bus bars 7U, 7V and 7W extend into the case 2. The bus bars 7U, 7V, and 7W have, for example, a plate-like form (for example, a sheet metal member), but may be realized by a conductor wire having a circular cross section. The bus bars 7U, 7V, and 7W are provided corresponding to the U phase, the V phase, and the W phase, respectively, and the power lines (lead wires) 1U, 1V, and 1W of each phase from the rotary electric machine 1 (FIG. 1) is joined. The power lines 1U, 1V, and 1W are drawn from the chamber SP1 into the chamber SP2 and connected to the bus bars 7U, 7V, and 7W. FIG. 5 schematically shows the junctions 9U, 9V, 9W between the bus bars 7U, 7V, 7W and the power lines 1U, 1V, 1W. The connection between the bus bars 7U, 7V, 7W and the power lines 1U, 1V, 1W may be realized by, for example, tightening bolts.

One end of the bus bars 7U, 7V, and 7W is joined to the power lines 1U, 1V, and 1W inside the case 2, and the other end is connected to the bus bar (not shown) on the inverter IV side in the inverter module MJ outside the case 2. Be joined. The bus bars 7U, 7V, and 7W may extend to the midpoints M1, M2, and M3 of the inverter IV (see FIG. 1), or may extend to the midpoints M1, M2, and M3 of the inverter IV via another bus bar. May be electrically connected to.

The bus bars 7U, 7V, 7W may be sealed by a resin portion (not shown) in such a manner that the portions forming the joint portions 9U, 9V, 9W are exposed. In this case, the resin portion may be fixed to the case 2 in the form of a terminal block that holds the bus bars 7U, 7V, and 7W. In FIG. 5, the bus bars 7U, 7V, and 7W are supported on the upper part of the case 2.

The power lines 1U, 1V, and 1W from the rotary electric machine 1 are joined to the coil 110 wound around the stator core 111. Alternatively, the power lines 1U, 1V and 1W may be formed as a part of the coil 110 of the stator core 111. The power lines 1U, 1V, and 1W may be in the form of the same coil wire (for example, a flat wire) as the coil 110 of the stator core 111. Alternatively, the power lines 1U, 1V, and 1W may have a plate-like shape (for example, a sheet metal member) similar to the bus bars 7U, 7V, and 7W, or may be realized by a conductor wire having a circular cross section. Further, another bus bar (intermediate bus bar) may be interposed between the power lines 1U, 1V, 1W and the bus bars 7U, 7V, 7W. In this case, the intermediate bus bar is also sealed by the resin portion and may be fixed to the case 2.

The power lines 1U, 1V, and 1W extend to the upper part of the chamber SP2. In this case, the power lines 1U, 1V, 1W and the bus bars 7U, 7V, 7W preferably extend into the air in the chamber SP2. That is, the power lines 1U, 1V, 1W and the bus bars 7U, 7V, 7W are located above the oil reservoir 80 (see FIG. 11) below the chamber SP2. In this case, only a part of the power lines 1U, 1V, 1W and the bus bars 7U, 7V, 7W may be located above the oil reservoir 80, or the whole may be located above the oil reservoir 80. It may be located. In this case, it is possible to prevent inconveniences such as foreign matter that may be mixed in the oil accumulated in the oil reservoir 80 adhering to the power lines 1U, 1V, 1W and the bus bars 7U, 7V, 7W.

As described above, according to the electrical connection structure between the inverter module MJ and the rotary electric machine 1 shown in FIGS. 4 and 5, wiring is realized by using the chamber SP2 of the second side L2 in the axial direction of the rotary electric machine 1. Therefore, the physique of the chamber SP1 in the case 2 can be reduced as compared with the case where the wiring is realized in the upper part of the chamber SP1 or the first side L1 in the axial direction of the chamber SP1.

In the example shown in FIG. 5, the axis of the counter gear mechanism 4 (second axis A2) is the axis of the rotary electric machine 1 (first axis A1) and the axis of the differential gear mechanism 5 (third axis A3). ) Is placed below both sides. Further, in the example shown in FIG. 5, the first axis A1, the second axis A2, and the third axis A3 are arranged in the order of the first axis A1, the third axis A3, and the second axis A2 from above.

The inverter module MJ may be arranged on the first side L1 in the axial direction with respect to the differential input gear 51 of the differential gear mechanism 5. Further, the inverter module MJ may be arranged offset to the D1 side with respect to the first axis A1. Further, the inverter module MJ may be arranged above the axis (A3) of the differential gear mechanism 5. Then, the inverter module MJ may be arranged at a position overlapping with the differential input gear 51 when viewed in the axial direction L. Regarding the arrangement of the two elements, "overlapping when viewed in a specific direction" means that the virtual straight line is 2 when the virtual straight line parallel to the specific direction is moved in each direction orthogonal to the virtual straight line. It means that there is at least a part of the area where both of the two elements intersect.

A part of the inverter module MJ may be arranged between the rotary electric machine 1 and the differential input gear 51 in the axial direction L. Then, a part of the inverter module MJ may be arranged at a position overlapping with the counter gear mechanism 4 when viewed in the vertical direction V.

Next, an oil-related configuration will be described with reference to FIG.

FIG. 6 is a diagram schematically showing the flow of oil in the cross-sectional view shown in FIG. 2 by arrows R1 to R11.

In this embodiment, the vehicle drive device 100 includes a mechanical hydraulic pump 71 (an example of an oil pump) driven by a driving force transmitted through a power transmission path, but is provided with a dedicated driving force source independent of the power transmission path. It does not have a driven electric hydraulic pump.

The mechanical hydraulic pump 71 is a pump that pumps up the oil stored in the oil reservoir 80 (see FIG. 11) in the case 2 and discharges the pumped oil. In this embodiment, as an example, the mechanical hydraulic pump 71 is housed in the case 2. Further, in this embodiment, as an example, the mechanical hydraulic pump 71 is driven by the rotation of the rotating member included in the drive transmission mechanism 10. Specifically, the mechanical hydraulic pump 71 is provided on the extension shaft 711 coaxially and integrally coupled with the counter shaft 41 at the L2 side end of the counter shaft 41. The mechanical hydraulic pump 71 may be in the form of a gear pump, for example. In the modified example, the mechanical hydraulic pump 71 may be connected to the L1 side end of the counter shaft 41, or may be connected so as to be driven by the rotation of the differential case 52 of the differential gear mechanism 5. May be good.

In this embodiment, the oil passage structure 90 included in the vehicle drive device 100 includes a first cover oil passage 91 (an example of the first oil passage) formed in the first cover member 22 of the case 2 and a rotor shaft 122. A rotor shaft oil passage 122a (an example of a second oil passage) formed inside, a second cover oil passage 93 (an example of a third oil passage) formed in the second cover member 23 of the case 2, and a case. It includes a case oil passage 94 formed in the member 21. In addition, the oil passage structure 90 also includes an input shaft oil passage 31a, a counter shaft oil passage 41a, and the like.

The first cover oil passage 91 extends in the axial direction L, and the end portion of the axial second side L2 is connected to the end portion of the case oil passage 94 on the axial first side L1. The first cover oil passage 91 is formed above the first cover member 22 (above the first axis A1). As shown in P1, the first cover oil passage 91 opens radially toward the coil end portion 112 on the first side L1 in the axial direction. Specifically, a radial oil hole 911 is formed in the first cover member 22, the radial outer side of the oil hole 911 is connected to the first cover oil passage 91, and the radial inner side opens to the chamber SP1. .. The radial inner opening of the oil hole 911 is formed at a position radially opposed to the coil end portion 112 on the first side L1 in the axial direction.

The rotor shaft oil passage 122a is realized by the hollow inside of the rotor shaft 122 as described above. In the rotor shaft oil passage 122a, the second side L2 in the axial direction is connected to the input shaft oil passage 31a.

The second cover oil passage 93 includes a radial oil passage 931 and an axial oil passage 932. The radial oil passage 931 extends radially R2, one end of which is connected to the discharge side of the mechanical hydraulic pump 71, and the other end of which is connected to the axial oil passage 932. In the axial oil passage 932, the axial second side L2 is connected to the radial oil passage 931 and the axial first side L1 is connected to the case oil passage 94 (see P3). The axial oil passage 932 is formed above the first axis A1.

The case oil passage 94 extends in the axial direction, the axial first side L1 is connected to the first cover oil passage 91, and the axial second side L2 is the axial oil passage 932 of the second cover oil passage 93. Connected to. The case oil passage 94 is formed above the first axis A1. As shown in the P2 portion, the case oil passage 94 opens radially toward the coil end portion 112 on the second side L2 in the axial direction. Specifically, the case member 21 is formed with a radial oil hole 941, the radial outer side of the oil hole 941 is connected to the case oil passage 94, and the radial inner side opens to the chamber SP1. The radial inner opening of the oil hole 941 is formed at a position radially opposed to the coil end portion 112 on the second side L2 in the axial direction.

In such an oil passage structure 90, the oil discharged from the mechanical hydraulic pump 71 flows upward through the radial oil passage 931 of the second cover oil passage 93 (see arrow R1), and at the uppermost portion, the oil is second. 2 Contains oil flowing into the axial oil passage 932 of the cover oil passage 93 (see arrow R2). Such oil flows axially through the axial oil passage 932 and continuously flows into the case oil passage 94 from the axial oil passage 932. The oil that has flowed into the case oil passage 94 is supplied (dripping) from the outside in the radial direction to the coil end portion 112 on the second side L2 in the axial direction through the oil hole 941 (see arrow R3). As a result, the coil end portion 112 on the second side L2 in the axial direction is cooled. Of the oil that has flowed into the case oil passage 94, the oil that flows in the axial direction without passing through the oil hole 941 (see arrow R4) flows into the first cover oil passage 91 at the first side L1 in the axial direction. The oil that has flowed into the first cover oil passage 91 is supplied (dripping) from the outside in the radial direction to the coil end portion 112 on the first side L1 in the axial direction through the oil hole 911 (see arrow R5). As a result, the coil end portion 112 on the first side L1 in the axial direction is cooled.

Further, the oil discharged from the mechanical hydraulic pump 71 flows upward through the oil flowing into the counter shaft oil passage 41a and the radial oil passage 931 of the second cover oil passage 93 (see arrow R1). , Contains oil flowing into the input shaft oil passage 31a. Such oil flows axially through the input shaft oil passage 31a (see arrow R7) and flows into the rotor shaft oil passage 122a. The oil flowing into the rotor shaft oil passage 122a flows axially along the inner peripheral surface 122d of the rotor shaft 122 due to the action of centrifugal force during rotation of the rotor 12 (see arrow R9), and flows through the rotor core 121 and the permanent magnet 123. Cool from the inside in the radial direction. Further, the oil flowing into the rotor shaft oil passage 122a has a first supply oil passage 122b (an example of an oil hole) and a second supply oil passage 122c (oil holes) formed so as to penetrate the rotor shaft 122 in the radial direction R. (See arrows R8 and R10). Here, the first supply oil passage 122b is formed at a position overlapping the coil end portion 112 on the first side L1 in the axial direction when viewed in the radial direction R of the rotor shaft 122. Further, the second supply oil passage 122c is formed at a position overlapping the coil end portion 112 on the second side L2 in the axial direction when viewed in the radial direction R of the rotor shaft 122. Therefore, as the rotor shaft 122 rotates, oil is injected from each of the first supply oil passage 122b and the second supply oil passage 122c toward the corresponding coil end portion 112 from the inside in the radial direction. Then, the coil end portion 112 is cooled by the oil adhering to the coil end portion 112. The oil discharged from each of the first supply oil passage 122b and the second supply oil passage 122c may be directly supplied to the coil end portion 112, or as shown in FIG. 6, such as an end plate. It may be supplied via a member.

The oil used for cooling the various cooling target portions in this way reaches the oil reservoir 80 (see FIG. 11) via the oil passage 98 formed in the lower part of the case member 21 of the case 2. Will be returned. The oil returned to the oil reservoir 80 is supplied to the second cover oil passage 93 and the like again via the mechanical hydraulic pump 71. In this way, in the oil passage structure 90, various cooling target portions are cooled while the oil circulates. The oil passing through the oil passage structure 90 may be used for lubrication of various bearings (for example, the first rotor bearing B1a and the like).

Here, the oil circulated in the oil passage structure 90 in this way is cooled by the oil cooler 73. The oil cooler 73 is provided with, for example, a pipe through which oil flows, and exchanges heat between the refrigerant (for example, cooling water, air, etc.) flowing outside the pipe and the oil in the pipe to exchange oil. It is configured to cool. As described above, in this embodiment, as an example, the oil cooler 73 is provided in the portion of the case member 21 that forms the chamber SP2, as schematically shown in FIG. Further, the oil cooler 73 is provided in the vicinity of the inverter case portion 2a. In this case, the oil cooler 73 can realize heat exchange between the cooling water passing through the inverter module MJ and the oil in the oil passage 932 in the axial direction. According to such an arrangement, the path for guiding the cooling water from the inverter module MJ to the oil cooler 73 can be shortened, and an efficient configuration can be realized.

The oil cooler 73 may be provided on the second side L2 in the axial direction of the second cover oil passage 93. However, in this case, the physique of the vehicle drive device 100 as a whole in the axial direction L tends to be large due to the oil cooler 73. In this respect, when the oil cooler 73 is provided in the upper part of the case 2 and in the vicinity of the inverter module MJ, it does not substantially increase the body shape of the vehicle drive device 100 as a whole in the axial direction L.

Next, the configuration related to the cooling water will be described with reference to FIGS. 2 and 7A to 10.

In this embodiment, the vehicle drive device 100 further includes a cooling water channel 13 through which cooling water for cooling the stator 11 and the like passes. Specifically, the case member 21 of the case 2 is formed with a cooling water channel 13 through which cooling water passes. The cooling water is, for example, LLC (Long Life Coolant). The cooling water passing through the cooling water channel 13 can take heat from the stator 11 that abuts on the case member 21 in the radial direction. That is, the stator 11 (and the coil 110 accordingly) can be cooled.

7A to 7D are explanatory views of the cooling water channel 13, specifically, FIG. 7A is a schematic perspective view of a portion of the case member 21 in the case 2, and FIG. 7B is a schematic perspective view of FIG. 7A. FIG. 7C is a schematic perspective view in which a part of the surface portion (the surface portion on the outer side in the radial direction) is cut off from the case member 21 in the case member 21, and FIG. 7C is a part in the space 130 for forming a cooling water channel in the case member 21. (Some) shows a state in which the second partition wall portion 135 is inserted, and as in FIG. 7B, a partial surface portion (diametrically outer surface portion) is cut off from the case member 21 in FIG. 7A. It is a perspective view. Further, FIG. 7D is a perspective view of the second partition wall portion 135 in a single item state. FIG. 8 is a schematic plan view when the case member 21 (and the cooling water channel 13) in the case 2 is unfolded in the circumferential direction, and FIG. 9 is a schematic cross section along the line CC of FIG. FIG. 10 is a diagram schematically showing the flow of cooling water in the figure shown in FIG. 8 by an arrow R20. 8 to 10 show the case member 21 in a state where the outer wall portion 214 is cut off (see FIG. 7C). Further, in FIG. 10, the inside of the case member 21 in which the first cover member 22 (wall portion 222) is schematically shown also forms a cooling water channel 13 as shown in FIGS. 2 and 7A. The space (cavity) 130 for the purpose is formed in a cylindrical shape. The space 130 is formed between the inner wall portion 213 and the outer wall portion 214 (gap in the radial direction) of the case member 21. Both the inner wall portion 213 and the outer wall portion 214 have a cylindrical shape, and the inner wall portion 213 is arranged radially inside the outer wall portion 214.

The space 130 formed between the inner wall portion 213 and the outer wall portion 214 in the radial direction is cylindrical, but is divided in the circumferential direction due to the case oil passage 94, and is discontinuous due to the division. The space 130 may be formed in such a manner that the width in the radial direction becomes smaller toward the second side L2 in the axial direction (see FIG. 2). In this case, when the case member in which the space 130 is formed is formed by casting, the die cutting for forming the space 130 becomes easy. That is, the case member 21 having the space 130 can be easily manufactured by using, for example, a mold having an opening / closing direction corresponding to the axial direction L.

As shown in FIG. 2, the space 130 (and the cooling water channel 13 accordingly) is closed by the wall portion 212 on the second side L2 in the axial direction. The wall portion 212 is a part of the case member 21. Corresponding to the circumferential extension range of the space 130, it extends continuously in the circumferential direction.

As shown in FIG. 2, the space 130 (and the cooling water channel 13 accordingly) in the case member 21 opens in the axial direction on the first side L1 in the axial direction. However, the space 130 (and the cooling water channel 13 accordingly) is closed by the first cover member 22 at the first side L1 in the axial direction. Specifically, the first cover member 22 has an annular wall portion 222, and the wall portion 222 closes the axial first side L1 of the space 130. In this way, in the state where the first cover member 22 is assembled to the case member 21 (that is, the state where the case 2 is assembled), the space 130 is closed in the entire circumferential direction on both sides in the axial direction L.

The case member 21 is formed with an inlet portion 131 and an outlet portion 132 for cooling water communicating with the space 130. The inlet portion 131 and the outlet portion 132 communicate with the space 130 in the radial direction.

Specifically, the inlet portion 131 extends in the radial direction, the outer side in the radial direction opens on the outer peripheral surface of the case member 21, and the inner side in the radial direction opens in the space 130. As shown in FIG. 7A, the inlet portion 131 may be provided adjacent to the case oil passage 94 in the circumferential direction. Further, the inlet portion 131 may be provided on the first side L1 in the axial direction of the case member 21.

Like the inlet portion 131, the outlet portion 132 extends in the radial direction, the outer side in the radial direction opens on the outer peripheral surface of the case member 21, and the inner side in the radial direction opens in the space 130. As shown in FIG. 7A, the outlet portion 132 may be provided adjacent to the case oil passage 94 in the circumferential direction. Further, the outlet portion 132 may be provided on the first side L1 in the axial direction of the case member 21. In this case, the outlet portion 132 is adjacent to the inlet portion 131 in the circumferential direction with the case oil passage 94 interposed therebetween. That is, the cooling water passage 13 has an inlet portion 131 and an outlet portion 132 at positions sandwiching the case oil passage 94 in the circumferential direction. As a result, the cooling water introduced from the inlet portion 131 can be circulated around the axis through the cooling water passage 13 in the case member 21 and then discharged from the outlet portion 132. As a result, it is possible to enhance the cooling function by the cooling water along the circumferential direction of the case member 21 and to make the cooling function by the cooling water uniform along the circumferential direction.

In the modified example, the inlet portion 131 and the outlet portion 132 may be provided in a manner of communicating with the space 130 in the axial direction. For example, the flow path related to the inlet portion 131 and the outlet portion 132 may be formed in the first cover member 22. In this case, the flow path is formed so as not to communicate with the oil hole 911 or the like. In this case, the space 130 may be opened in the axial direction at a local position related to the inlet portion 131 and the outlet portion 132.

The case member 21 has a first partition wall portion 211 extending in the radial direction between the inner wall portion 213 and the outer wall portion 214. The radial inner side of the first partition wall portion 211 is coupled to the inner wall portion 213, and the radial outer side is coupled to the outer wall portion 214. The first partition wall portion 211 divides the space 130 (and the cooling water channel 13 accordingly) in the circumferential direction in a partial range d1 in the axial direction L. The first partition wall portion 211 is integrally formed with the case member 21. In the first partition wall portion 211, the second side L2 in the axial direction is connected to the wall portion 212, and the first side L1 in the axial direction is a predetermined distance d2 (first) from the end surface 219 of the first side L1 in the axial direction of the case member 21. Only the distance (an example of the distance) is terminated at the position of L2 on the second side in the axial direction (see FIG. 7B).

Further, a second partition wall portion 135 is provided between the inner wall portion 213 and the outer wall portion 214 in the case member 21. The inner side of the second partition wall portion 135 is in contact with the inner wall portion 213, and the outer side in the radial direction is in contact with the outer wall portion 214. The second partition wall portion 135 divides the space 130 (and the cooling water channel 13 accordingly) in the circumferential direction in a partial range d3 in the axial direction L. In the second partition wall portion 135, the axial first side L1 extends to the end surface 219 of the axial first side L1 of the case member 21, and the axial second side L2 is a predetermined distance d4 (second) from the wall portion 212. Only one example of two distances) is terminated at the position of L1 on the first side in the axial direction. The predetermined distance d4 may be the same as the predetermined distance d2 described above. The second partition wall portion 135 is alternately arranged in the circumferential direction with the first partition wall portion 211 described above. The distance (circumferential length) between the first partition wall portion 211 and the second partition wall portion 135 adjacent to each other in the circumferential direction may be the same as the predetermined distance d2 described above (see FIG. 7C). ..

Here, since a part of the space 130 remains between the second partition wall portion 135 and the wall portion 212 in the axial direction L, the second partition wall portion 135 is usually different from the first partition wall portion 211. Cannot be integrally formed with the case member 21 by the casting of. Therefore, in this embodiment, the second partition wall portion 135 is a separate member from the case member 21, and is attached to the case member 21. However, in the modified example, the case member 21 may be formed by using a collapsible core. In this case, the case member 21 including the first partition wall portion 211 and the second partition wall portion 135 can be integrally formed.

The second partition wall portion 135 is formed of, for example, a metal gasket. The second partition wall portion 135 may be attached by being inserted into the space 130 so as to be fitted into the axial groove portion 215, for example, as shown in FIGS. 7D and 9. In this case, the second partition wall portion 135 has a ridge portion 1351 that fits into the groove portion 215. As a result, the adhesion between the second partition wall portion 135 and the outer wall portion 214 and the inner wall portion 213 is improved, and the cooling water flowing in the circumferential direction over the radial end surfaces of the second partition wall portion 135 is effective. Can be reduced to. The groove portion 215 is formed on both the outer wall portion 214 and the inner wall portion 213 of the case member 21, but may be formed on only one of them.

Thus, in this embodiment, the cooling water channel 13 is formed by the space 130 divided by the first partition wall portion 211 and the second partition wall portion 135. That is, the cooling water channel 13 extends axially from the end of the axial first side L1 to the end of the axial second side L2 around the first axis A1 in the case member 21. (See FIG. 8) is included. The plurality of axial water channels 13A communicate with each other at the end of the axial first side L1 or the end of the axial second side L2. That is, the axial water passages 13A on both sides of the first partition wall portion 211 in the circumferential direction communicate with each other in the circumferential direction at the end portion (section of the predetermined distance d2) of the first side L1 in the axial direction, and the second partition wall in the circumferential direction. The axial water passages 13A on both sides of the portion 135 communicate in the circumferential direction at the end portion (section of a predetermined distance d4) of the second side L2 in the axial direction. Therefore, the cooling water channel 13 orbits around the first axis A1 in a form of meandering between the axial first side L1 and the axial second side L2. Specifically, the cooling water introduced from the inlet portion 131 meanders between the axial first side L1 and the axial second side L2 as shown by the arrow R20 in FIG. It goes around A1 and is discharged from the outlet portion 132. As a result, the cooling water can be evenly flowed along the axial direction L over the entire circumference of the case member 21. As a result, the stator 11 can be cooled evenly.

Next, with reference to FIG. 11, the entire oil cooling by the oil channel structure 90 and the water cooling by the cooling water channel 13 described above will be described.

FIG. 11 is a diagram schematically showing the overall configuration of the cooling structure of the vehicle drive device 100.

In the example shown in FIG. 11, the cooling water channel 13 communicates with the inverter module MJ. Specifically, the water pump 78 circulates the cooling water so as to pass through the inverter module MJ, the cooling water channel 13, and the oil cooler 73 in this order (see arrows R120 to R122). The cooling water from the oil cooler 73 is cooled by the radiator 79. The radiator 79 may realize heat exchange between air (for example, air passing when the vehicle is traveling) and cooling water. The positions of the water pump 78 and the radiator 79 are not limited to the positions shown in FIG. 11, and for example, the water pump 78 may be provided between the oil cooler 73 and the radiator 79. In this way, in the example shown in FIG. 11, the cooling water takes heat from a heat generating element such as a power module (not shown) in the inverter module MJ, and then heats the stator 11 in the cooling water channel 13. Then, the oil cooler 73 takes away the heat of the oil in the oil passage structure 90, and then the radiator 79 cools the oil. In this case, since the inverter module MJ (and the power module accordingly) is arranged on the most upstream side with respect to the radiator 79, it is effectively cooled by the cooling water. Further, in the example shown in FIG. 11, the cooling water channel 13 in the case member 21 is arranged on the upstream side of the radiator 79 next to the inverter module MJ (and the power module accordingly), so that the stator 11 is effective. Can be cooled to. However, in the modified example, the cooling water passage 13 and the inverter module MJ may be provided in order from the upstream side with respect to the radiator 79. Further, in another modification, the circulation path from the radiator 79 may branch to a path to the inverter module MJ and a path to the cooling water channel 13. In this case, the branch path from the inverter module MJ and the branch path from the cooling water channel 13 may be merged and then guided to the radiator 79.

Further, in the example shown in FIG. 11, since the oil in the oil passage structure 90 is cooled by the oil cooler 73 through which the cooling water from the radiator 79 passes, the various cooling target portions described above can be appropriately cooled. Specifically, the oil discharged from the mechanical hydraulic pump 71 is cooled by the oil cooler 73 and then supplied from the outside in the radial direction toward the coil end portion 112 (see arrow R110). Further, the oil discharged from the mechanical hydraulic pump 71 is supplied from the inside in the radial direction toward the coil end portion 112 (see arrow R111). As a result, the coil end portion 112 can be effectively cooled from both sides in the radial direction. The oil used for cooling the coil end portion 112 in this way falls and collects in the oil reservoir 80 (see arrow R112). Then, the oil in the oil reservoir 80 is discharged to the coil end portion 112 or the like again by the mechanical hydraulic pump 71 via the strainer 74 or the like (see arrow R113).

As described above, according to the present embodiment, the coil end portion 112 can be effectively cooled from both sides in the radial direction by the oil, and the stator 11 can be effectively cooled from the outside in the radial direction by the cooling water. Further, since the oil is passed through the rotor shaft oil passage 122a, the rotor core 121 and the permanent magnet 123 can be cooled from the inside in the radial direction. In this way, according to the present embodiment, the entire rotary electric machine 1 can be efficiently cooled.

Further, since the cooling water used for cooling the stator 11 is the same as the cooling water used for cooling the inverter module MJ, a simple configuration can be realized as compared with the case where these are circulated separately and independently. That is, the stator 11 and the inverter module MJ can be cooled by the cooling water by using one water pump 78.

In the example shown in FIG. 11, the oil cooler 73 is provided in an oil passage (for example, an oil passage 932 as shown in FIG. 6) between the mechanical hydraulic pump 71 and the case member 21, but is limited to this. do not have. For example, the oil cooler 73 may be provided between the strainer 74 and the mechanical hydraulic pump 71, or may be provided between the mechanical hydraulic pump 71 and the rotor shaft oil passage 122a.

According to the present embodiment described above, the following excellent effects are particularly exhibited.

According to the present embodiment, as described above, as described above, the cooling water channel 13 is formed in the case member 21 forming the peripheral wall portion, and the cooling water channel 13 opens in the axial direction only on the first side L1 in the axial direction. However, the second side L2 in the axial direction is closed by the portion of the case member 21. This eliminates the need for a cover member for closing the axial second side L2 of the cooling water channel 13, and makes it possible to form the case 2 from three pieces. As a result, the cost can be reduced by reducing the number of parts for the case 2.

Further, according to the present embodiment, as described above, the cooling water channel 13 orbits around the first axis A1 while going back and forth between the axial first side L1 and the axial second side L2 in the axial direction. It is formed in such an embodiment. As a result, the cooling performance of the stator 11 by the cooling water can be made uniform along the circumferential direction and along the axial direction.

Further, according to the present embodiment, as described above, the electrical wiring between the coil 110 and the inverter module MJ is realized via the chamber SP2. As a result, the degree of freedom in arranging the cooling water channel 13 can be increased as compared with the case where the same electrical wiring is realized from the upper part of the chamber SP1 or the first side L1 in the axial direction of the chamber SP1. That is, since the cooling water channel 13 can be formed without considering the space for wiring and the like, it can be formed within the optimum forming range for cooling. Further, it is possible to reduce the possibility that the layout of other peripheral elements (not shown) around the chamber SP1 in the case member 21 is significantly restricted due to such wiring. That is, it becomes easy to secure a mounting space for other peripheral elements around the portion of the case member 21 that forms the first chamber.

Further, according to the present embodiment, as described above, the oil discharged by the mechanical hydraulic pump 71 is supplied to the inside of the hollow of the rotor shaft 122 (rotor shaft oil passage 122a), so that the rotation of the rotor 12 is performed. Occasionally, the cooling capacity for the rotor core 121 (and the permanent magnet 123 that can be provided on the rotor core 121 accordingly) can be ensured. Further, when the rotor 12 is not rotating, the mechanical hydraulic pump 71 cannot supply oil, but in this case as well, the stator core 111 and the coil 110 can be cooled from the radial outside via the cooling water channel 13. Further, since the need for cooling the rotor core 121 is relatively low when the rotor 12 is not rotating, stopping the supply of oil from the mechanical hydraulic pump 71 does not cause substantial inconvenience. In this way, according to this embodiment, it is possible to eliminate the electric hydraulic pump and reduce the cost while appropriately securing the cooling capacity for the rotary electric machine 1.

Further, according to the present embodiment, as described above, since the oil passage structure 90 and the cooling water passage 13 are provided, the stator 11 is provided by the cooling water passage 13 while effectively cooling the coil end portion 112 by the oil passage structure 90. Can be cooled effectively. As a result, the cooling capacity for the stator 11 can be further increased as compared with the case where the coil end portion 112 is cooled only by the oil passage structure 90.

Further, according to the present embodiment, as described above, since the cooling water channel 13 communicates with the inverter module MJ, the stator 11 can be cooled by using the cooling water communicating with the inverter module MJ. That is, the supply of cooling water to the cooling water channel 13 can be made more efficient.

Further, according to the present embodiment, as described above, since the oil cooler 73 is arranged in the vicinity of the inverter module MJ, it is easy to connect the cooling water pipeline between the oil cooler 73 and the inverter module MJ. And it will be efficient.

Further, according to the present embodiment, as described above, since the case oil passage 94 is formed in the case member 21, the axial first side L1 and the axial second side L2 are formed via the case oil passage 94. Oil can be passed between. Further, the case oil passage 94 can be formed above the first axis A1 (for example, the zenith portion) without significantly restricting the formation range of the cooling water passage 13 in the case member 21. Further, since the case oil passage 94 is formed above the first axis A1 (for example, the zenith), it is preferable to form the oil hole 911 above the first axis A1 (for example, the zenith). The connection with the first cover oil passage 91 having the oil passage 91 and the oil hole 941 preferably formed above the first axis A1 (for example, the zenith portion) are facilitated.

Further, according to the present embodiment, as described above, the cooling water channel 13 has an inlet portion 131 and an outlet portion 132 at positions sandwiching the case oil passage 94 in the circumferential direction. In this case, the case oil passage 94 and the cooling water passage 13 can be efficiently arranged in the case member 21. Further, since the case oil passage 94 and the cooling water passage 13 are close to each other (that is, they are adjacent to each other in the circumferential direction), heat exchange can be realized at the close locations.

Further, according to the present embodiment, as described above, the case oil passage 94 passes above the vertical center position of the stator 11 (the position of the first axis A1) and the first cover oil passage 91. Communicate with. In this case, even when the first cover oil passage 91 is formed relatively upward (for example, near the zenith portion) suitable for dropping oil toward the coil end portion 112, the case is formed in the first cover oil passage 91. The oil passage 94 can be efficiently communicated.

Further, according to the present embodiment, as described above, the mechanical hydraulic pump 71 is provided at the end of the second side L2 in the axial direction in the counter shaft 41 of the counter gear mechanism 4. In this case, various cooling target portions can be cooled while guiding the oil discharged from the mechanical hydraulic pump 71 from the axial second side L2 to the axial first side L1.

Further, according to the present embodiment, as described above, the oil discharged by the mechanical hydraulic pump 71 is the second cover oil passage 93, the case oil passage 94, the first cover oil passage 91, and the rotor shaft oil passage. It flows in the order of 122a. In this case, various parts to be cooled while guiding the oil discharged by the mechanical hydraulic pump 71 to the second cover oil passage 93, the case oil passage 94, the first cover oil passage 91, and the rotor shaft oil passage 122a in this order. Can be cooled efficiently.

Next, another embodiment will be described with reference to FIG. Hereinafter, for the sake of distinction, the above-described embodiment will also be referred to as “Example 1”, and this embodiment will also be referred to as “Example 2”.

FIG. 12 is a cross-sectional view showing the configuration of the vehicle drive device 100A according to the second embodiment.

In the vehicle drive device 100A according to the second embodiment, the case 2 is replaced with the case 2A and the input shaft 31 is replaced with the input shaft 31A with respect to the vehicle drive device 100 according to the first embodiment described above. Mainly different. The case 2A according to the second embodiment is different from the case 2 according to the first embodiment in that the first cover member 22 is replaced with the first cover member 22A.

The first cover member 22A is different from the first cover member 22 according to the first embodiment described above in that the oil passage 912 in the radial direction is formed. The radial oil passage 912 extends radially, the inside in the radial direction is connected to the rotor shaft oil passage 122a, and the outside in the radial direction is connected to the first cover oil passage 91 (axial oil passage).

The input shaft 31A is different from the input shaft 31 according to the first embodiment described above in that it is solid. That is, the input shaft 31A does not have the input shaft oil passage 31a. In this case, the oil discharged from the mechanical hydraulic pump 71 enters the rotor shaft oil passage 122a via the second cover oil passage 93, the case oil passage 94, the first cover oil passage 91, and the radial oil passage 912. Will be supplied.

The oil channel structure 90A according to the second embodiment also has the same effect as the oil channel structure 90 according to the first embodiment described above. In particular, according to the present embodiment, the oil cooled by the oil cooler 73 is supplied to the rotor shaft oil passage 122a without passing through the oil reservoir 80, so that the oil cooling capacity via the rotor shaft oil passage 122a Can be enhanced.

In the second embodiment, similarly to the first embodiment described above, the oil discharged from the mechanical hydraulic pump 71 is supplied from the second side L2 in the axial direction to the first side L1 in the axial direction. Not limited to. For example, the oil discharged from the mechanical hydraulic pump 71 is supplied to the first cover oil passage 91 and the case oil passage 94 via the radial oil passage 912, and is supplied to the rotor through the radial oil passage 912. It may be supplied to the shaft oil passage 122a. In this case, for example, the mechanical hydraulic pump 71 may be connected to the L1 side end of the counter shaft 41. Further, in this case, the oil cooler 73 may be provided between the mechanical hydraulic pump 71 and the radial oil passage 912.

Although each embodiment has been described in detail above, the present invention is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the above-described embodiment.

1 ... rotary electric machine, 4 ... counter gear mechanism, 10 ... drive transmission mechanism, 11 ... stator, 12 ... rotor, 13 ... cooling water channel, 21 ... case member, 211 ... 1st partition wall, 22 ... 1st cover member, 23 ... 2nd cover member, 41 ... counter shaft, 71 ... mechanical hydraulic pump (oil pump), 73 ...・ Oil cooler, 90, 90A ・ ・ ・ oil passage structure, 91 ・ ・ ・ 1st cover oil passage (1st oil passage), 93 ・ ・ ・ 2nd cover oil passage, 94 ・ ・ ・ case oil passage, 100 ・・ ・ Vehicle drive device, 111 ・ ・ ・ stator core, 112 ・ ・ ・ coil end part, 121 ・ ・ ・ rotor core, 122 ・ ・ ・ rotor shaft, 122a ・ ・ ・ rotor shaft oil passage (second oil passage), 122b ... 1st supply oil passage, 122c ... 2nd supply oil passage, 131 ... inlet portion, 132 ... outlet portion, 135 ... second partition wall portion, SP1 ... room (first) 1 room), SP2 ... room (2nd room), MJ ... inverter module

Claims (12)

It is a drive device for vehicles including a rotary electric machine.
The rotary electric machine is
With a rotor having a rotor shaft and a rotor core,
With a stator having a stator core and coil,
A case member that forms a first chamber in which the rotor and the stator are housed and is radially adjacent to the stator.
A first cover member, which is attached to the first side in the axial direction of the case member and covers the first chamber, is provided.
A cooling water channel is formed in the case member.
The cooling water channel extends axially around the rotation axis of the rotary electric machine in the case member from the end on the first side in the axial direction to the end on the second side opposite to the first side. Includes multiple axial channels to
The plurality of axial waterways communicate with each other at the first side end portion or the second side end portion in the axial direction, and the first cover member is opened while the first side end portion in the axial direction is opened. A vehicle drive device that faces in the axial direction and the end portion on the second side in the axial direction is closed by a portion of the case member. The cooling water channel is formed in a space extending in the axial direction and the circumferential direction in the case member.
In the space, a partition wall portion is further provided between the plurality of axial waterways in the circumferential direction.
The partition wall portion includes a first partition wall portion extending from the end portion on the second side in the axial direction to the front of the first distance of the end portion on the first side in the axial direction, and the end portion on the first side in the axial direction. The vehicle drive device according to claim 1, further comprising a second partition wall portion extending from the second side end portion to a second distance front portion. The first partition wall portion is integrally formed with the case member.
The vehicle drive device according to claim 2, wherein the second partition wall portion is inserted into the space. Including an oil pump
A first oil passage through which the oil discharged by the oil pump passes is formed in the first cover member.
The vehicle drive device according to any one of claims 1 to 3, wherein the first oil passage opens radially toward the coil end portion on the first side in the axial direction of the coil. A case oil passage through which the oil discharged by the oil pump passes is formed in the case member.
The case oil passage passes above the vertical center position of the stator and communicates with the first oil passage.
The vehicle drive device according to claim 4, wherein the cooling water channel has an inlet portion and an outlet portion at positions sandwiching the case oil passage in the circumferential direction. The vehicle drive device according to claim 5, wherein the case oil passage opens radially toward the coil end portion on the second side in the axial direction of the coil. In the rotor shaft, a second oil passage through which the oil discharged by the oil pump passes is formed inside the hollow.
The vehicle drive device according to any one of claims 4 to 6, wherein the second oil passage communicates with the first oil passage. The vehicle drive device according to any one of claims 4 to 7, further comprising an oil cooler that realizes heat exchange between the cooling water flowing through the cooling water channel and the oil discharged by the oil pump. .. Further includes a drive transmission mechanism including gears,
The case member further forms a second chamber in which the drive transmission mechanism is housed.
The vehicle drive device according to any one of claims 1 to 8, wherein the second chamber is arranged on the second side in the axial direction with respect to the first chamber. The case member is a one-piece member.
The vehicle drive device according to claim 9, further comprising a second cover member attached to the second side in the axial direction of the case member and covering the second chamber. It further includes a water-cooled inverter module that is electrically connected to the coil.
The vehicle drive device according to claim 9 or 10, wherein the cooling water channel communicates with the inverter module. The vehicle drive device according to claim 11, wherein the inverter module and the coil are electrically connected to each other via wiring passing through the second chamber.

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