JP2019073275A - Vehicle driving device - Google Patents

Abstract

To inhibit enlargement of a vehicle driving device in a radial direction.SOLUTION: A speed reduction device 3 which reduces a speed of rotation of a rotary electric machine 2 and a differential gear mechanism 4 which distributes driving force from the rotary electric machine 2 into a first wheel and a second wheel are disposed coaxially with the rotary electric machine 2 and housed in the case 1. An outer diameter of the speed reduction device 3 is smaller than an outer diameter of a stator 24 of the rotary electric machine 2. A terminal board 8 for connecting a power line 85 of the rotary electric machine 2 to an exterior part of the case 1 is disposed at a position located at the radial outer side R1 of the speed reduction device 3 and overlapping with the speed reduction device 3 in a radial direction view.SELECTED DRAWING: Figure 1

Description

  The present invention provides a rotating electric machine serving as a driving force source for the first wheel and the second wheel, a reduction gear for reducing the rotation of the rotating electric machine, and two wheels for driving power from the rotating electric machine transmitted through the reduction gear. The present invention relates to a drive device for a vehicle including a differential gear device for distributing to and a case for accommodating these.

  In JP-A-11-166609, a motor (11) as a power source, a planetary gear unit having two planetary gear trains (14, 15), and a differential (12) connected to wheels have the same axis. A drive for the vehicle (trans-ample) placed on top and housed in a housing (16) is disclosed (see FIG. 2 etc.). The reference numerals in parentheses in the background art are those of the reference document (the same applies hereinafter). Outside the housing (16) of this drive device, a cable or a bus bar electrically connected to the motor (11) and a circuit for driving a rotating electrical machine such as an inverter provided outside the housing (16) is connected Terminal blocks are provided. In this drive device, the terminal block is disposed radially outside the motor (11) and at a position overlapping the motor (11) in the radial direction. Among the driving devices, the motor (11) is a device having a large radial dimension, and including the terminal block, the driving device for the vehicle becomes radially larger. That is, there is room for improvement in reducing the size of the vehicle drive device in the radial direction.

  Patent No. 4016804 discloses a drive device for a vehicle in which an electric motor (1) serving as a motive power source and a reduction gear (13) are disposed on the same axis and housed in a motor casing (2). (See Figure 1 etc.) This reduction gear (13) is configured to have two planetary gear stages (14, 15) and a differential gear (16), and the differential gear (16) is connected to the drive shaft (20). It is connected and drives a driving wheel. Also in this drive device, the terminal box (25) for connecting the three-phase power supply line electrically connecting the electric motor (1) and the circuit for driving the rotary electric machine outside the motor casing (2) is It is arrange | positioned in the radial direction outer side of an electric motor (1), and the position which overlaps with an electric motor (1) by a radial direction view.

Japanese Patent Application Laid-Open No. 11-166609 Patent No. 4016804

  In view of the above background, it is desirable to suppress the radial increase in the size of the vehicle drive device.

As one aspect, the vehicle drive device in view of the above is:
A rotating electrical machine serving as a driving force source of the first wheel and the second wheel;
A reduction gear that decelerates the rotation of the rotating electrical machine;
A differential gear that distributes the driving force from the rotating electrical machine transmitted through the reduction gear to the first wheel and the second wheel;
And a case for housing the rotary electric machine, the reduction gear, and the differential gear device.
The reduction gear and the differential gear device are coaxially arranged with the rotating electrical machine;
The reduction gear is disposed between the rotating electrical machine and the differential gear in an axial direction;
The outer diameter of the reduction gear is smaller than the outer diameter of the stator of the rotating electrical machine,
A terminal block for connecting a power line of the rotating electrical machine to the outside of the case is disposed at a position radially outward of the reduction gear and overlapping the reduction gear in a radial direction.

  Here, “overlap” does not necessarily mean that all of the terminal blocks overlap with the reduction gear, but includes a state in which part of the terminal blocks overlaps with the reduction gear.

  According to this configuration, the terminal block is disposed at a position overlapping in a radial direction with the reduction gear having an outer diameter smaller than that of the rotary electric machine and radially outward of the reduction gear. Thereby, compared with the case where a terminal block is arranged in the position which overlaps with rotation electrical machinery and radial direction, the amount of projection to the diameter direction outside of a terminal block can be controlled. Therefore, according to this configuration, it is possible to prevent the vehicle drive device from being enlarged in the radial direction.

  Further features and advantages will become apparent from the following description of the embodiment of the vehicle drive described with reference to the drawings.

Axial sectional view of a drive device for a vehicle Skeleton view of the drive unit for vehicles Axial sectional view of the reduction gear A schematic block diagram showing a system configuration of an electric circuit system for driving a rotating electric machine Axial sectional view showing an example of a differential gear device by a planetary gear mechanism

  Hereinafter, an embodiment of a vehicle drive device will be described based on the drawings. FIG. 1 is an axial sectional view of a vehicle drive device 100, and FIG. 2 is a skeleton diagram of the vehicle drive device 100. As shown in FIG. The vehicle drive device 100 includes, for example, a hybrid vehicle using an internal combustion engine and a rotating electric machine as a driving force source of the first wheel 501 and the second wheel 502, and a driving force source of the first wheel 501 and the second wheel 502 as a rotating electric machine. It is a drive unit mounted on an electric vehicle. As shown in FIGS. 1 and 2, the vehicle drive device 100 includes only the rotary electric machine 2 as a driving force source of the first wheel 501 and the second wheel 502. In the case of a two-wheel drive four-wheeled vehicle, this enables an electric vehicle to be realized. Further, in the case of a four-wheel drive four-wheeled vehicle, a hybrid vehicle can be realized by driving the other two wheels by the driving force of the internal combustion engine. As a matter of course, in the case of a four-wheel drive four-wheeled vehicle, a four-wheel drive electric vehicle can also be realized by applying the vehicle drive device 100 of this embodiment to the other two wheels.

  In the following description, “drive connection” refers to a state in which two rotating elements are connected to be able to transmit a driving force, and a state in which the two rotating elements are connected to rotate integrally. Alternatively, the two rotary elements include a state in which the driving force is communicably coupled via one or more transmission members. Such transmission members include various members that transmit rotation at the same speed or at different speeds, such as a shaft, a gear mechanism, a belt, a chain, and the like. The transmission member may include an engagement device that selectively transmits the rotation and the driving force, such as a friction engagement device or a meshing engagement device. However, in the reduction gear 3 and the differential gear device 4 described below, in the case of “drive connection” for each rotating element, three or more of the rotating elements included in the device do not intervene with each other. It refers to the state of being driven and connected.

Moreover, in the following description, when expressing as "cylindrical", "cylindrical", etc., even if it has some odd-shaped parts, it means that the outline shape as the whole is a cylinder or a cylinder. Not limited to these, the same applies to other expressions used with “shape” in relation to the shape and the like. Further, regarding the arrangement of the two members, “overlap in specific direction view (for example, overlap in radial direction view)” means moving an imaginary straight line parallel to the line of sight direction in each direction orthogonal to the imaginary line In this case, it indicates that there is a region where the virtual straight line intersects both of the two members. Further, terms relating to dimensions, orientations, orientations, and the like also include states having differences due to errors (errors within the tolerance of manufacturing). Moreover, the direction about each member in the following description represents the direction in the state where they were assembled | attached to the drive device for vehicles.

  As shown in FIGS. 1 and 2, the vehicle drive device 100 includes a case 1, a rotating electrical machine 2 having a rotor shaft 27 for outputting a driving force, a reduction gear 3 including a planetary gear mechanism, and a differential. A gear device 4 is provided. The reduction gear 3 decelerates the rotation of the rotary electric machine 2 and transmits the driving force to the differential gear device 4. The differential gear device 4 distributes the driving force from the rotating electrical machine 2 to each of the first drive shaft 51 and the second drive shaft 52. In the present embodiment, the first drive shaft 51 is drivingly connected to the distribution output shaft 53. The differential gear 4 distributes the driving force to the second drive shaft 52 and the distribution output shaft 53, and the first drive shaft 51 receives the distributed driving force via the distribution output shaft 53.

  In the vehicle drive device 100 of the present embodiment, the rotary electric machine 2, the reduction gear 3, the differential gear unit 4, the first drive shaft 51, the second drive shaft 52, and the distribution output shaft 53 are rotors of the rotary electric machine 2. It is coaxially arranged with reference to the axis 27. Therefore, the direction along the rotor shaft 27 of the rotating electrical machine 2 is equivalent to the direction along the rotating shaft of the vehicle drive device 100, and the direction along the diameter of the rotor shaft 27 of the rotating electrical machine 2 is the vehicle drive This is equivalent to the direction along the diameter of the device 100. In this embodiment, the direction along the rotor shaft 27 of the rotating electrical machine 2 is referred to as the axial direction L of the vehicle drive device 100, and the direction along the diameter of the rotor shaft 27 of the rotating electrical machine 2 is the diameter of the vehicle drive device 100 It is called direction R. Further, in the axial direction L, the side where the rotary electric machine 2 is disposed with respect to the reduction gear 3 is referred to as an axial second side L2, and the side where the differential gear device 4 is disposed relative to the reduction gear 3 is the axial direction It is referred to as the first side L1. Further, in the radial direction R, the outer side opposite to the rotor shaft 27 is referred to as the radially outer side R1, and the inner side on the rotor shaft 27 side is referred to as the radially inner side R2.

  Further, in the vehicle drive device 100 of the present embodiment, the rotary electric machine 2, the reduction gear 3, and the differential gear device 4 are arranged in the order of the power transmission path. As described later, the reduction gear 3 has a first planetary gear mechanism 31 and a second planetary gear mechanism 32. Taking this into consideration, the rotary electric machine 2, the first planetary gear mechanism 31, the second planetary gear mechanism 32, and the differential gear device 4 are arranged in the described order in the order of the power transmission path. Further, the rotating electrical machine 2, the reduction gear 3 (the first planetary gear mechanism 31 and the second planetary gear mechanism 32), and the differential gear device 4 are configured as the rotating electrical machine 2 and the first planetary gear mechanism 31 along the axial direction L. , And the second planetary gear mechanism 32 and the differential gear device 4 are arranged in this order. That is, in any of the order of the power transmission path and the order of the arrangement along the axial direction L, the first planetary gear mechanism 31 is arranged closer to the rotary electric machine 2 than the second planetary gear mechanism 32.

  The case 1 accommodates therein the rotating electrical machine 2, the reduction gear 3, and the differential gear device 4. Further, in the embodiment, the case 1 further includes a part of the first drive shaft 51 (an end of the first side L1 in the axial direction) and a part of the second drive shaft 52 (an end of the second side L2 in the axial direction). And the distribution output shaft 53 are also accommodated inside. The case 1 is formed to include a rotary electric machine 2, a reduction gear 3, and a cylindrical peripheral wall portion 1 a surrounding the radially outer side R <b> 1 of the differential gear device 4. That is, the rotary electric machine 2, the reduction gear 3, and the differential gear device 4 are disposed in order from the second axial side L2 in the accommodation space S in which the radially outer side R1 is partitioned by the peripheral wall portion 1a.

The case 1 has a case body 11 (first case portion), a body cover 12 (second case portion), and a bottom cover 13. The peripheral wall portion 1 a is formed in a cylindrical shape extending in the axial direction L (specifically, a cylindrical shape whose cross-sectional shape differs depending on the position in the axial direction L). And, the peripheral wall portion 1a
The whole is divided into two by the case main body 11 (first case portion) and the main body cover 12 (second case portion) joined to the case main body 11 from the first axial side L1. The case body 11 is formed in a bottomed cylindrical shape having a bottom portion 11b located at the end of the second axial side L2, and has an opening on the opposite side (axial first side L1) from the bottom 11b There is. The main body cover 12 is disposed in contact with the case main body 11 on the second axial side L2 so as to cover the opening, and is formed in a conical cylindrical shape having a smaller diameter toward the first axial side L1. .

  The entire portion on the second side L2 in the axial direction with respect to the joint 15 between the case main body 11 and the main body cover 12 in the peripheral wall 1a is constituted by at least a part of the case main body 11, and is more than the joint 15 in the peripheral wall 1a. The entire portion of the axial first side L1 is configured by at least a portion of the main body cover 12. The bottom cover 13 is arranged to cover the bottom 11 b on the second side L 2 in the axial direction than the bottom 11 b of the case main body 11. The case body 11 and the body cover 12 are fixed to each other by a fixing member (in this embodiment, a bolt). Similarly, the case body 11 and the bottom cover 13 are fixed to each other by a fixing member (in the present embodiment, a bolt).

  The rotary electric machine 2 and a part (first planetary gear mechanism 31) of the reduction gear 3 are disposed in an internal space (first accommodation space S1) of the case main body 11. The other part of the reduction gear 3 (the second planetary gear mechanism 32), the differential gear device 4, and a part of the second drive shaft 52 (the end of the second axial side L2) It is arrange | positioned at space (2nd accommodation space S2). A part of the first drive shaft 51 (an end of the first side L1 in the axial direction) is disposed in an internal space (first accommodation space S1) formed by the case body 11 and the bottom cover 13. The distribution output shaft 53 is disposed in an internal space (a first accommodation space S1 and a second accommodation space S2) formed by the case body 11, the body cover 12 and the bottom cover 13.

  As shown in FIG. 3, the case 1 has a support member 14. In the present embodiment, the support member 14 includes a first support member 141 and a second support member 142. The first support member 141 is integrally fixed to the case main body 11, and the second support member 142 is integrally fixed to the first support member 141. The first support member 141 is formed to extend along the radial direction R and the circumferential direction between the rotary electric machine 2 and the reduction gear 3 (first planetary gear mechanism 31). The end of the radially outer side R1 of the first support member 141 and the case main body 11 are fixed by a fixing member (a bolt in the present embodiment) at at least one place in the circumferential direction of the first support member 141. The second support member 142 is formed to extend along the radial direction R and the circumferential direction between the first planetary gear mechanism 31 and the second planetary gear mechanism 32. The end portion of the radially outer side R1 of the second support member 142 and the first support member 141 are fixed by a fixing member (in this embodiment, a bolt) at at least one location in the circumferential direction of the second support member 142. The second support member 142 is integrally fixed to the first support member 141 on the first side L1 in the axial direction than the first support member 141.

The rotary electric machine 2 includes a rotor 21 having a permanent magnet 23 inside a rotor core 22, a stator 24 having a stator core 25 and a rotor shaft 27 connected to rotate integrally with the rotor core 22. It is a magnet type electric rotating machine. A stator coil 28 is wound around the stator core 25. A part of the stator coil 28 protrudes from the stator core 25 in the axial direction L to form a coil end portion 26. The coil end portions 26 are formed on both sides in the axial direction L with respect to the stator core 25. The rotor shaft 27 and the rotor core 22 are connected by the radially inner side R2 of the rotor core 22, and the rotor 21 and the rotor shaft 27 rotate integrally. The rotary electric machine 2 is arranged such that at least the entire stator core 25 is surrounded by the peripheral wall portion 1a from the radially outer side R1. The stator core 25 is supported by the case body 11. Further, in the present embodiment, the rotary electric machine 2 is disposed so that the coil end portion 26 protruding in the axial direction L with respect to the stator core 25 is also surrounded by the peripheral wall portion 1 a from the radial outer side R1. In the present embodiment, the rotary electric machine 2 is a permanent magnet type rotary electric machine, but may be another type of rotary electric machine such as an induction type rotary electric machine.

  The rotor shaft 27 is formed in a cylindrical shape. A portion of the rotor shaft 27 which protrudes on the second axial side L 2 from the rotor core 22 along the axial direction L is rotatably supported by the case body 11 of the case 1 via the first rotor bearing 61. A portion of the rotor shaft 27 which protrudes on the first axial side L1 relative to the rotor core 22 along the axial direction L is rotatably supported by the first support member 141 of the support member 14 via the second rotor bearing 62. ing.

  As described above, in the present embodiment, the reduction gear 3 includes the first planetary gear mechanism 31 and the second planetary gear mechanism 32. The first planetary gear mechanism 31 is a single pinion type planetary gear mechanism having a first sun gear S31, a first ring gear R31, a first carrier C31, and a plurality of first pinion gears P31. The first sun gear S31 is an input element of the first planetary gear mechanism 31, and is connected to the rotor shaft 27 of the rotary electric machine 2 so as to rotate integrally therewith. The first ring gear R31 is a fixed element of the first planetary gear mechanism 31, and is supported by the first support member 141 so as not to rotate. The first carrier C31 is an output element of the first planetary gear mechanism 31, and is connected to the second sun gear S32 of the second planetary gear mechanism 32 as described later.

  The first pinion gear P31 is disposed to mesh with the first sun gear S31 and the first ring gear R31, and is rotatably supported by the first carrier C31. The first pinion gear P31 is configured to rotate (rotation) about the axis of the first pinion gear P31 and to rotate (revolution) about the axis of the first sun gear S31. Although not shown, a plurality of first pinion gears P31 are provided at intervals from each other along a revolving locus of the first pinion gear P31.

  As described above, the second planetary gear mechanism 32 is disposed on the first axial side L1 with respect to the first planetary gear mechanism 31, that is, the side opposite to the rotating electric machine 2 side with respect to the first planetary gear mechanism 31. Is located in The second planetary gear mechanism 32 is a single pinion type planetary gear mechanism including a second sun gear S32, a second ring gear R32, a second carrier C32, and a plurality of second pinion gears P32.

  The second sun gear S32 is an input element of the second planetary gear mechanism 32. As described above, the second sun gear S32 is connected to the first carrier C31 which is an output element of the first planetary gear mechanism 31. In the present embodiment, the second sun gear S32 is coupled to the first carrier C31 by spline engagement. That is, in the present embodiment, the first planetary gear mechanism 31 and the second planetary gear mechanism 32 are formed independently of each other, and the first planetary gear mechanism 31 and the second planetary gear mechanism 32 are connected by spline engagement. Are illustrated. However, the first carrier C31 and the second sun gear S32 may be formed as one component without being limited to the form in which the first carrier C31 and the second sun gear S32 are formed by different members. For example, the first planetary gear mechanism 31 and the second planetary gear mechanism 32 may be integrally configured to form one reduction gear 3. In addition, even when the first carrier C31 and the second sun gear S32 are formed by different members, not only the spline engagement but also both may be connected by welding or the like.

In the present embodiment, the first planetary gear mechanism 31 and the second planetary gear mechanism 32 are configured using a bevel gear which is higher in strength than a spur gear and smaller in gear noise and therefore suitable for use in high rotation. ing. However, the helical gear generates a thrust force which is a force in the direction along the rotation axis due to its structure. In order to receive the load that the gear device using the bevel gear tends to move in the axial direction L, the gear device using the bevel gear is generally provided with a thrust bearing. As shown in FIGS. 1 and 3, a first thrust bearing 71 is provided on the second axial side L2 with respect to the first planetary gear mechanism 31, and the first planetary gear mechanism 31 and the second planetary gear mechanism 32 A second thrust bearing 72 is provided between the axial directions L, and a third thrust bearing 73 is provided on the first axial side L1 with respect to the second planetary gear mechanism 32. More specifically, the first thrust bearing 71 is provided on the second side L2 in the axial direction with respect to the first sun gear S31. The second thrust bearing 72 is provided on the first side L1 in the axial direction with respect to the first sun gear S31, and on the second side L2 in the axial direction with respect to a connecting portion of the first carrier C31 and the second sun gear S32. . The third thrust bearing 73 is provided on the first side L1 in the axial direction with respect to the second sun gear S32.

  By the way, as shown in FIGS. 1 and 2, the second drive shaft 52 is disposed adjacent to the differential gear device 4 in the axial direction L, but the first drive shaft 51 and the differential gear in the axial direction L Between the device 4 and the rotary electric machine 2 and the reduction gear 3 are present. For this reason, the first drive shaft 51 is connected to the differential gear device 4 through a distribution output shaft 53 which penetrates the rotary electric machine 2 and the reduction gear 3. In the present embodiment, the first carrier C <b> 31 and the second sun gear S <b> 32, which integrally rotate, are rotatably supported with respect to the distribution output shaft 53 via a slide bearing such as a bush.

  The second ring gear R32 is a fixed element of the second planetary gear mechanism 32, and is supported by the second support member 142 so as not to rotate in the circumferential direction. The second carrier C32 is an output element of the second planetary gear mechanism 32. In the present embodiment, the second carrier C32 is integrally formed with the differential case D4 of the differential gear device 4. Further, in the present embodiment, an end portion of the second carrier C32 in the axial direction second side L2 is a first differential case between the first planetary gear mechanism 31 and the second planetary gear mechanism 32 of the reduction gear 3. It is rotatably supported by the second support 142 via the bearing 66.

  The second pinion gear P32 is disposed to mesh with the second sun gear S32 and the second ring gear R32, and is rotatably supported by the second carrier C32. The second pinion gear P32 is configured to rotate (rotation) around the axis of the second pinion gear P32 and to rotate (revolution) around the axis of the second sun gear S32. Although not shown, a plurality of second pinion gears P32 are provided at intervals from each other along the revolution trajectory of the second pinion gear P32.

  The differential gear device 4 distributes the driving force from the rotary electric machine 2 transmitted via the reduction gear 3 to the first wheel 501 and the second wheel 502. Specifically, the differential gear device 4 includes a first drive shaft 51, which is drivingly connected to the distribution output shaft 53, and a second drive shaft, which drive power from the rotating electrical machine 2 is transmitted via the reduction gear 3. It distributes to the 1st wheel 501 and the 2nd wheel 502 via 52 and respectively. In the present embodiment, the differential gear device 4 includes a differential case D4 as an input element, a pinion shaft F4 supported by the differential case D4 so as to rotate integrally with the differential case D4, and a pinion shaft F4. It has a first differential pinion gear P41 and a second differential pinion gear P42 which are rotatably supported, and a first side gear B41 and a second side gear B42 as distribution output elements. Here, the first differential pinion gear P41, the second differential pinion gear P42, the first side gear B41, and the second side gear B42 are all bevel gears. That is, the differential gear device 4 is a differential gear device provided with a bevel gear type gear mechanism.

The differential case D4 is a hollow member, and a pinion shaft F4, a pair of differential pinion gears P4 (a first differential pinion gear P41 and a second differential pinion gear P42), and A first side gear B41 and a second side gear B42 are accommodated. In the present embodiment, the differential case D4 is integrally formed with the second carrier C32 of the second planetary gear mechanism 32, and the second carrier C32 is configured as a part of the differential case D4. Therefore, in the present embodiment, the end portion of the second carrier C32 in the axial direction second side L2 functions as the first supported portion D4a of the differential case D4. The first supported portion D4a is disposed between the first planetary gear mechanism 31 and the second planetary gear mechanism 32 in the axial direction L. The first supported portion D4a is directly supported by a first differential case bearing 66 fixed to the case 1 via the support member 14. As described above, the first support member 141 is integrally fixed to the case main body 11, and the first support member 141 and the second support member 142 are integrally fixed to each other. Therefore, the first supported portion D4a is supported by the case main body 11 via the first differential case bearing 66.

  Further, the differential case D4 has a second supported portion D4b located on the opposite side (the axial first side L1) from the first supported portion D4a in the axial direction L. Here, the second supported portion D4b is formed to project along the axial direction L toward the first axial side L1 relative to the second side gear B42. The second supported portion D4b is formed in a cylindrical shape coaxial with the first side gear B41 and the second side gear B42. The second supported portion D4b is directly supported by a second differential case bearing 67 fixed to the main body cover 12 of the case 1. That is, the second supported portion D4b is rotatably supported by the main body cover 12 of the case 1 via the second differential case bearing 67.

  The pinion shaft F4 is inserted into a pair of differential pinion gears P4 and rotatably supports them. The pinion shaft F4 is inserted into a through hole formed in the differential case D4 along the radial direction R, and is locked by the locking member 43 to the differential case D4.

  The pair of differential pinion gears P4 are attached to the pinion shaft F4 in a state of facing each other at intervals along the radial direction R, and configured to rotate around the pinion shaft F4 in the internal space of the differential case D4. ing.

  The first side gear B41 and the second side gear B42 are rotating elements after distribution in the differential gear device 4. The first side gear B41 and the second side gear B42 are provided to be opposed to each other with the pinion shaft F4 interposed therebetween along the axial direction L, and in the internal space of the differential case D4, in the respective circumferential directions It is configured to rotate. The first side gear B41 and the second side gear B42 mesh with the first differential pinion gear P41 and the second differential pinion gear P42, respectively. A spline for connecting the distribution output shaft 53 is formed on the inner peripheral surface of the first side gear B41. A spline for connecting the second drive shaft 52 is formed on the inner peripheral surface of the second side gear B42.

  The distribution output shaft 53 is a member for transmitting the driving force from the rotary electric machine 2 distributed by the differential gear device 4 to the first drive shaft 51. The distribution output shaft 53 passes through the radially inner side R2 of the rotor shaft 27 of the rotary electric machine 2 in the axial direction L. A spline for coupling to the first side gear B41 of the differential gear device 4 is formed on the outer peripheral surface of the end portion of the distribution output shaft 53 on the first axial side L1. The distribution output shaft 53 and the first side gear B41 are connected so as to rotate integrally as a result of the splines engaging with the splines of the inner peripheral surface of the first side gear B41. A connecting portion 53 a for connecting the first drive shaft 51 is formed at an end of the second axial side L 2 of the distribution output shaft 53.

The connecting portion 53 a extends from the portion on the second axial side L 2 to the inner space of the bottom cover 13 than the rotary electric machine 2 in the inner space of the case main body 11. The connecting portion 53 a is formed in a cylindrical shape coaxial with a portion of the distribution output shaft 53 other than the connecting portion 53 a. The connecting portion 53 a has an outer diameter larger than the outer diameter of the portion of the distribution output shaft 53 other than the connecting portion 53 a. The connecting portion 53 a is rotatably supported by the bottom cover 13 of the case 1 via the first output bearing 68 and is rotatably supported at the bottom portion 1 of the case body 11 via the second output bearing 69.
It is supported by 1b. A spline for connecting the first drive shaft 51 is formed on the inner peripheral surface of the portion of the connecting portion 53a on the first axial side L1.

  The first drive shaft 51 is drivingly connected to the first wheel 501, and the second drive shaft 52 is drivingly connected to the second wheel 502. In the present embodiment, the connecting portion 53a is provided at the end of the second axial side L2 of the distribution output shaft 53, and the first drive shaft 51 and the connecting portion 53a of the distribution output shaft 53 are connected by splines. ing. However, without being limited to such a configuration, for example, a flange yoke is provided at the end of the second axial side L2 of the distribution output shaft 53 instead of the connecting portion 53a, and the flange yoke and the first drive are provided. The shaft 51 may be fastened by a bolt.

  As described above, in the first planetary gear mechanism 31, the first sun gear S31, which is an input element, is drivingly connected to the rotor shaft 27 of the rotary electric machine 2, and the rotation of the rotary electric machine 2 is decelerated by the first reduction ratio. The driving force is output from the first carrier C31 which is an element. In the second planetary gear mechanism 32, the second sun gear S32, which is an input element, is drivingly connected to the first carrier C31 of the first planetary gear mechanism 31, and the rotation of the rotary electric machine 2 is further decelerated by the second reduction ratio. The driving force is output from the second carrier C32 which is an element.

  The circuit block diagram of FIG. 4 schematically shows a system configuration of an electric circuit system that drives the rotary electric machine 2. An electric circuit system for driving the rotating electrical machine 2 is configured with an inverter unit 10 as a core. Inverter unit 10 and stator coil 28 of rotating electric machine 2 are electrically connected via terminal block 8 connecting the wiring on the side of inverter unit 10 and the wiring on the side of rotating electric machine 2 (here, 3-phase bus bar 85). It is connected to the.

  The inverter unit 10 includes an inverter 30 that converts power between DC power and AC power of multiple phases. In the present embodiment, the inverter 30 is connected to the AC rotating electric machine 2 and the high voltage battery 93 (DC power supply, high voltage DC power supply in case of distinction from low voltage DC power supply to be described later). Convert power with The inverter 30 is connected to the high voltage battery 93 and is connected to the AC rotating electric machine 2 to convert electric power between DC and multiple phases of AC (here, three-phase AC). The high voltage battery 93 is configured by, for example, a secondary battery (battery) such as a nickel hydrogen battery or a lithium ion battery, an electric double layer capacitor, or the like. As in the present embodiment, when the rotating electrical machine 2 is a driving power source of a vehicle, the high voltage battery 93 is a large voltage large capacity DC power supply having a rated power supply voltage of, for example, 200 to 400 volts. Further, the inverter unit 10 is provided with a DC link capacitor 40 (smoothing capacitor) between the positive electrode and the negative electrode on the DC side of the inverter 30. The DC link capacitor 40 stabilizes the DC link voltage Vdc (the voltage between the positive electrode on the DC side of the inverter 30 and the negative electrode) which fluctuates according to the fluctuation of the power consumption of the rotary electric machine 2.

The inverter 30 is configured to have a plurality of switching elements. As shown in FIG. 4, the inverter 30 is provided with a plurality of (here, three) arms for one AC phase which are configured by a series circuit of the upper stage switching element and the lower stage switching element. Switching elements include IGBTs (Insulated Gate Bipolar Transistors) and power MOSFETs (Metal).
Power that can operate at high frequencies, such as Oxide Semiconductor Field Effect Transistors, SiC-MOSFETs (Silicon Carbide-Metal Oxide Semiconductor FETs), SiC-SITs (SiC-Static Induction Transistors), GaN-MOSFETs (Gallium Nitride-MOSFETs), etc. It is preferable to apply a semiconductor element. As shown in FIG. 4, in the present embodiment, an embodiment in which an IGBT is used as a switching element is illustrated.

The respective switching elements are provided with free wheeling diodes in parallel, with the direction from the negative electrode to the positive electrode (the direction from the lower side to the upper side) as a forward direction. For example, the inverter 30 is configured as a switching element module in which switching elements forming arms of three phases, including free wheel diodes, are integrated into one power module.

As shown in FIG. 4, the inverter 30 is controlled by an inverter control device 20 (M-CTRL). The inverter control device 20 is constructed using a logic circuit such as a microcomputer as a core member. The inverter control device 20 performs current feedback control using a vector control method based on the target torque of the rotary electric machine 2, and controls the rotary electric machine 2 via the inverter 30. The target torque of the rotary electric machine 2 is, for example, a request signal from another control device such as a vehicle control device 91 (VCL-CTRL) which is one of the upper electronic control units (ECU: Electronic Control Unit) in the vehicle. Provided. The actual current flowing through the stator coil 28 of each phase of the rotary electric machine 2 is detected by the current sensor 82, and the inverter control device 20 acquires the detection result. As shown in FIG. 4, in the present embodiment, an example in which the current sensor 82 is disposed on the terminal block 8 through which the three-phase power line passes is illustrated. However, current sensor 82 may be provided on AC bus bar 85 or the like. Further, the magnetic pole position at each time of the rotor 21 is detected by, for example, a rotation sensor 83 such as a resolver, and the inverter control device 20 acquires the detection result.

  The inverter control device 20 performs current feedback control using the detection results of the current sensor 82 and the rotation sensor 83. The inverter controller 20 is configured to have various functional units for current feedback control, and each functional unit is realized by cooperation of hardware such as a microcomputer and software (program). . The current feedback control is well known and thus the detailed description is omitted here.

  The operating voltage of the microcomputer, which is the core of the vehicle control device 91 and the inverter control device 20, is, for example, 5 volts or 3.3 volts. These control devices operate by being supplied with power from a low voltage battery (low voltage DC power supply) (not shown) which is a power supply of lower voltage (for example, 12 to 24 volts) than the high voltage battery 93. For this reason, the inverter controller 20 has the drive capability (for example, the ability to operate the circuit in the latter stage, such as voltage amplitude and output current) of the switching control signal (gate drive signal in the case of IGBT) generated by the inverter controller 20. A drive circuit is provided which is respectively enhanced and relayed to each switching element.

  In the present embodiment, the inverter control device 20, the inverter 30, and the DC link capacitor 40 are formed as the inverter unit 10. The inverter unit 10 and the vehicle drive device 100 are electrically connected by a bus bar, a harness or the like. In particular, the three-phase AC power line 86 of the inverter 30 is connected to the stator coil 28 of the rotary electric machine 2 via the terminal block 8. As shown in FIGS. 1 and 3, in the present embodiment, a three-phase bus bar 85 extending from the stator coil 28 is connected to the terminal block 8 inside the case 1 by an internal connection member 8 a such as a bolt or a nut. Further, the three-phase AC power line 86 of the inverter 30 (inverter unit 10) is connected to the terminal block 8 outside the case 1 by an external connection member 8b such as a bolt or a nut.

  By the way, in consideration of the in-vehicle performance of the vehicle drive device 100, it is preferable that the entire device be miniaturized as much as possible. In the vehicle drive device 100 of the present embodiment, by providing the configuration as described below, it is possible to suppress an increase in the size of the vehicle drive device 100 in the radial direction R.

As described above, the whole of the peripheral wall portion 1a is divided into two by the case main body 11 and the main body cover 12 joined to the case main body 11 from the first axial direction L1. As shown in FIG. 1, the joint surface 16 between the case main body 11 and the main body cover 12 is closer to the axial first side L1 than the stator core 25 of the rotary electric machine 2 (the end surface 25 a of the axial first side L1 of the stator core 25 It is arrange | positioned at the axial direction 1st side L1). Here, the bonding surface 16 is a surface (matching surface) where the surface of the case main body 11 to be bonded to the main body cover 12 and the surface of the main body cover 12 to be connected to the case main body 11 meet.

  Among the devices disposed in the housing space S, the rotary electric machine 2 is a device having a relatively large diameter. Therefore, the peripheral wall portion 1a tends to be larger in the radial direction R in a portion surrounding the stator core 25 from the radial outer side R1, but by arranging the joint surface 16 on the first axial side L1 than the stator core 25 as described above. The joint portion 15 in which the joint surface 16 is formed can be provided by avoiding the portion surrounding the stator core 25 from the radially outer side R1 in the peripheral wall portion 1a. Thus, the joint portion 15 can be provided on the peripheral wall portion 1a while suppressing an increase in size in the radial direction R of the case 1 (that is, an increase in size in the radial direction R of the vehicle drive device 100). In the present embodiment, the rotary electric machine 2 is an inner rotor type rotary electric machine, and the stator core 25 is fixed to the inner peripheral surface of the peripheral wall portion 1a. Therefore, the size in the radial direction R of the peripheral wall portion 1a in the portion surrounding the stator core 25 from the radial outer side R1 corresponds to the diameter of the outer peripheral surface of the stator core 25.

  As described above, since the joint surface 16 is disposed on the first side L1 in the axial direction than the stator core 25, the entire stator core 25 is radially outward by the case main body 11 (first peripheral wall portion 11a) of the accommodation space S. It arrange | positions to the part (1st accommodation space S1) divided R1. As shown in FIG. 3, in the present embodiment, the coil end portion 26 protruding to the first axial direction L1 with respect to the stator core 25 is also disposed in the first accommodation space S1. That is, in the present embodiment, the joint surface 16 is disposed on the first axial side L1 relative to the coil end portion 26 on the axial first side L1 of the stator 24. As shown in FIG. 1, in the present embodiment, the entire differential gear device 4 is a portion (the outer circumferential direction R1 of the accommodation space S divided by the main body cover 12 (second peripheral wall portion 12a) ( It is arrange | positioned at 2nd accommodation space S2). Moreover, the reduction gear 3 is arrange | positioned over 1st accommodation space S1 and 2nd accommodation space S2. That is, in the present embodiment, the joint portion 15 in which the joint surface 16 is formed is provided at a position radially outward R1 of the reduction gear 3 and at a position overlapping the reduction gear 3 in the radial direction R view.

  In the present embodiment, the outer diameter of the rotary electric machine 2 is larger than the outer diameter (φ3) of the reduction gear 3 and larger than the outer diameter of the differential gear device 4. The terminal block 8 for connecting the power line (three-phase power line 85) of the rotary electric machine 2 to the inverter unit 10 installed outside the case 1 is radially outer side R1 than the reduction gear 3 and viewed in radial direction It is disposed at a position overlapping the reduction gear 3. In the present embodiment, as described above, the joint portion 15 in which the joint surface 16 is formed is provided to avoid the portion surrounding the stator core 25 in the circumferential wall portion 1a from the radially outer side R1. The outer diameter of the rotary electric machine 2 is larger than the outer diameter (φ3) of the reduction gear 3 and the outer diameter of the differential gear device 4. Further, the outer diameter of the inner rotor type rotating electric machine 2 has a size corresponding to the outer diameter (φ2) of the stator 24, and specifically has a size corresponding to the diameter of the outer peripheral surface of the stator core 25. Therefore, the joint portion 15 is formed such that the case 1 does not increase in the radial direction R.

  Since the terminal block 8 is disposed near such a joint portion 15, even if the terminal block 8 is disposed, the whole of the vehicle drive device 100 is disposed at a position which does not increase in the radial direction R. That is, the terminal block 8 is protruded to the inside of the case 1 by arranging the terminal block 8 at a position overlapping the reduction gear 3 of the outer diameter (φ3) smaller than the outer diameter (φ2) of the stator 24 in the radial direction. Therefore, the amount of protrusion of the terminal block 8 to the radially outer side R1 can be suppressed. Therefore, compared with the case where the terminal block 8 is disposed at a position overlapping the rotary electric machine 2 in the radial direction, the vehicle drive device 100 is unlikely to be large in the radial direction R.

By the way, in the present embodiment, the rotary electric machine 2 and the reduction gear 3 disposed in the first accommodation space S1.
The (first planetary gear mechanism 31) is assembled to the case main body 11 from the first axial direction L1 and disposed in the second accommodation space S2 (the second planetary gear mechanism 32) and the differential gear The device 4 is assembled to the main body cover 12 from the axial second side L2. As shown in FIG. 1 and FIG. 3, in the present embodiment, the terminal block 8 in the axial direction L is the joint surface 16 between the case main body 11 and the main body cover 12, and the axial first side of the stator core 25 in the stator 24. It is disposed between the end face 25a of L1. For this reason, the part arrange | positioned in case 1 of the terminal block 8 will be arrange | positioned in the position close | similar to the joint surface 16 in the case main body 11. As shown in FIG. Therefore, an operation of connecting a power line such as a three-phase bus bar 85 extending from the stator coil 28 (coil end portion 26) of the rotary electric machine 2 to the terminal block 8 can be easily performed from the opening of the case body 11. In particular, in the case where the power line is not a relatively soft wiring material such as a harness but is a wiring material having high rigidity such as a bus bar, the degree of freedom in the work is reduced. It becomes.

  As described above, the coil end portion 26 protrudes in the axial direction L more than the stator core 25. That is, the coil end portion 26 projects from the end face 25a of the first axial side L1 of the stator core 25 to the first axial side L1. Accordingly, the terminal block 8 is disposed between the joint surface 16 of the case body 11 and the body cover 12 in the axial direction L and the end 26 a of the first end L 1 of the coil end portion 26 of the stator 24 in the axial direction. Is preferable.

  As described above, the rotary electric machine 2 and the first planetary gear mechanism 31 are assembled to the case main body 11 from the first axial direction L1, and the second planetary gear mechanism 32 and the differential gear device 4 have the main body cover 12 , And assembled from the second axial side L2. Further, since the outer diameter of the rotating electric machine 2 is larger than the outer diameter (φ 3) of the reduction gear 3 and the outer diameter of the differential gear device 4, the diameter of the peripheral wall portion 1 a in the joint portion 15 is the outer diameter of the rotating electric machine 2 The diameter corresponds to (the outer diameter (φ2) of the stator 24). In the present embodiment, since the outer diameter of the differential gear device 4 is smaller than the outer diameter (φ3) of the reduction gear 3, the first side L1 in the axial direction with respect to the joint portion 15 in the main body cover 12 (second peripheral wall portion 12a) The portion adjacent to the above is sufficient for the diameter corresponding to the outer diameter (.phi.3) of the reduction gear 3 (second planetary gear mechanism 32). Also in the present embodiment, the diameter of the portion adjacent to the first side L1 in the axial direction with respect to the bonding portion 15 in the main body cover 12 is smaller than the diameter of the peripheral wall portion 1a in the bonding portion 15.

  Therefore, the end of the second axial side L2 of the main body cover 12 matches the diameter of the main body cover 12 (second peripheral wall portion 12a) to the diameter of the larger diameter case main body 11 (first peripheral wall portion 11a) For this purpose, the radial outer side R1 is enlarged. That is, the enlarged diameter portion 18 (radial protrusion) is formed at the end of the second axial side L2 of the main body cover 12. In the present embodiment, the enlarged diameter portion 18 is formed in a flange shape that protrudes toward the radially outer side R1 and is continuous in the circumferential direction at an end of the second side L2 in the axial direction of the main body cover 12.

  In the above, the form in which the terminal block 8 is disposed on the side of the case main body 11 is illustrated in consideration of the assembly of the rotary electric machine 2 to the case main body 11, the wiring with the terminal block 8 and the like. However, it does not prevent the terminal block 8 from being disposed on the side of the main body cover 12. For example, the terminal block 8 may be disposed on the radially outer side R1 of the enlarged diameter portion 18. Also in this case, a relatively large space is secured between the second planetary gear mechanism 32 and the second peripheral wall 12a. Therefore, the wire connecting the terminal block 8 and the stator coil 28 can be properly accommodated in the case 1. In this case, it is necessary to connect the stator coil 28 and the terminal block 8 in a state where the case main body 11 and the main body cover 12 are not joined. Therefore, it is preferable that the power line extending from the stator coil 28 (the coil end portion 26) to the terminal block 8 be a flexible wiring material such as a harness.

Other Embodiments
Hereinafter, other embodiments will be described. The configurations of the respective embodiments described below are not limited to those applied individually, but may be applied in combination with the configurations of the other embodiments as long as no contradiction arises.

(1) In the above, the reduction gear 3 illustrated and demonstrated the structure which has two planetary gear mechanisms (1st planetary gear mechanism 31 and 2nd planetary gear mechanism 32). However, without being limited to such a configuration, the reduction gear 3 may be configured by one planetary gear mechanism, or may be configured to have three or more planetary gear mechanisms.

(2) In the above, the case main body 11 and the main body cover 12 were demonstrated as an example the structure joined using a volt | bolt. However, without being limited to such a configuration, the case main body 11 and the main body cover 12 may be fastened by a method other than the bolt, such as fastening with a rivet, for example.

(3) In the above, the bevel gear type differential gear device 4 is illustrated. However, the differential gear device 4 is not limited to the bevel gear type, and may be a planetary gear type as in the third planetary gear mechanism 9 shown in FIG. 5. As shown in FIG. 5, the third planetary gear mechanism 9 is a double pinion type planetary gear mechanism, and has a third sun gear S9, a third carrier C9, and a third ring gear R9. The third ring gear R9 is an input element of the third planetary gear mechanism 9, and is connected to rotate integrally with the second carrier C32 of the second planetary gear mechanism 32. Also, the third sun gear S9 and the third carrier C9 are the distribution output elements of the third planetary gear mechanism 9. Here, the third carrier C9 is connected to the distribution output shaft 53, a connecting portion (spline) is formed on the third sun gear S9, and the third sun gear S9 is connected to the second drive shaft 52 by spline engagement. There is.

(4) In the above, the configuration in which the differential case D4 of the differential gear device 4 is integrally formed with the second carrier C32 of the second planetary gear mechanism 32 has been described as an example. However, without being limited to such a configuration, the differential case D4, the second carrier, and the C 32 may be separable from each other (for example, a configuration in which they are mutually connected by bolts, splines, etc.).

Outline of Embodiment
Hereinafter, an outline of the vehicle drive device (100) described above will be briefly described.

The vehicle drive device (100) includes, as one aspect,
A rotating electric machine (2) serving as a driving force source for the first wheel (501) and the second wheel (502);
A reduction gear (3) for decelerating the rotation of the rotating electric machine (2);
A differential gear (4) for distributing the driving force from the rotating electrical machine (2) transmitted through the reduction gear (3) to the first wheel (501) and the second wheel (502) ,
And a case (1) for housing the rotating electric machine (2), the reduction gear (3), and the differential gear (4),
The reduction gear (3) and the differential gear (4) are coaxially arranged with the rotating electrical machine (2);
The reduction gear (3) is disposed between the rotating electrical machine (2) and the differential gear (4) in the axial direction (L),
The outer diameter (φ3) of the reduction gear (3) is smaller than the outer diameter (φ2) of the stator (24) of the rotating electrical machine (2),
The power line (85) of the rotating electrical machine (2) is placed on the case (1) at a position radially outward (R1) than the reduction gear (3) and at a position overlapping the reduction gear (3) in a radial direction. Terminal block (8) for connecting with the outside of

  Here, “overlap” is not limited to a state in which all of the terminal blocks (8) overlap with the reduction gear (3), and a part of the terminal blocks (8) overlaps with the reduction gear (3). Including the

  According to this configuration, the terminal block is located at a position overlapping the reduction gear (3) having a smaller outer diameter in the radial direction as compared with the rotary electric machine (2) in the radial direction outer side (R1) than the reduction gear (3) (8) is arranged. Thereby, the amount of protrusion of the terminal block (8) to the radially outer side (R1) is suppressed as compared with the case where the terminal block (8) is disposed at a position overlapping with the rotary electric machine (2) in radial direction. be able to. Therefore, according to the present configuration, the vehicle drive device (100) can be prevented from increasing in size in the radial direction (R).

  Here, the case (1) is a cylindrical peripheral wall (1a) surrounding the radially outer side (R1) of the rotary electric machine (2), the reduction gear (3), and the differential gear (4). The first case portion (11), and the first side portion in the axial direction (L) with respect to the first case portion (11). Divided into two parts by a second case part (12) joined from L1), the first case part (11) supports the stator (24), and the terminal block (8) is the shaft In the direction (L), the joint surface (16) of the first case portion (11) and the second case portion (12), and the first axial direction side of the stator core (25) of the stator (24) It is preferable to arrange | position between the end surface (25a) of L1).

  According to this configuration, the terminal block (8) and the rotating electric machine are provided from the opening of the first case portion (11) located at the joint surface (16) of the first case portion (11) and the second case portion (12). Connection work with (2) can be easily performed.

1: Case 2: Rotating electric machine 3: Reduction gear 4: Differential gear unit 8: Terminal block 11: Case body (first case portion)
12: Body cover (second case section)
16: joint surface 24: stator 25: stator core 25a: end face 31 of first axial direction of stator core 31: first planetary gear mechanism 32: second planetary gear mechanism 85: three-phase bus bar (power line of rotating electrical machine)
100: Vehicle drive device 501: first wheel 502: second wheel L: axial direction L1: axial first side R: radial direction R1: radially outer side φ2: stator outer diameter φ3: outer diameter of reduction gear

Claims (2)

A rotating electrical machine serving as a driving force source of the first wheel and the second wheel;
A reduction gear that decelerates the rotation of the rotating electrical machine;
A differential gear that distributes the driving force from the rotating electrical machine transmitted through the reduction gear to the first wheel and the second wheel;
And a case for housing the rotary electric machine, the reduction gear, and the differential gear device.
The reduction gear and the differential gear device are coaxially arranged with the rotating electrical machine;
The reduction gear is disposed between the rotating electrical machine and the differential gear in an axial direction;
The outer diameter of the reduction gear is smaller than the outer diameter of the stator of the rotating electrical machine,
A terminal block for connecting a power line of the rotating electrical machine to the outside of the case is disposed at a position radially outward of the reduction gear and overlapping the reduction gear in a radial direction. Drive device. The case includes the rotary electric machine, the reduction gear, and a cylindrical peripheral wall surrounding a radial direction outer side of the differential gear device.
The entire peripheral wall portion is divided into two by a first case portion and a second case portion joined from an axial first side which is one side of the first case portion in the axial direction,
The first case portion supports the stator,
The terminal block is disposed between the joint surface of the first case portion and the second case portion and the end surface of the stator core on the first axial direction side in the axial direction. The vehicle drive device according to 1.

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