JP2016136822A - Drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a drive device having a motor and a resolver into a shape that is compact in an axial direction to improve the mountability to a vehicle etc.SOLUTION: A drive device includes: a motor 51 having a rotor shaft 54; a case 110 housing the motor; a bearing 56 disposed between the rotor shaft 54 and the case 110; and a resolver 70 having a resolver rotor 78, which integrally rotates with the rotor shaft 54, and a resolver stator 71 disposed at the radial outer side of the resolver rotor. The resolver stator 71 is disposed so as to overlap with the bearing 56 in an axial direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a drive device having a motor and a resolver that detects a rotation angle of the motor.

  In recent years, various hybrid vehicles and electric vehicles equipped with a motor as a drive source have been proposed or put into practical use.

  Patent Document 1 discloses a structure in which a motor is arranged on an axle for a right front wheel in a front engine / front drive type (FF type) hybrid vehicle having an engine and a motor as drive sources. . In this hybrid vehicle, the rotor shaft of the motor is a cylindrical member fitted on the outside of the axle, and a first reduction gear is provided on the rotor shaft. A final reduction gear meshed with a second reduction gear meshed with the first reduction gear and a differential ring gear fixed to the outer periphery of the differential case, which is an input part of the front wheel differential, is arranged on the reduction shaft arranged in parallel with the axle. A drive gear is provided. The output of the motor is decelerated between the first reduction gear and the second reduction gear and transmitted to the reduction shaft, and further decelerated between the final drive gear and the diff ring gear and transmitted to the differential case. By such deceleration, the output torque of the motor is increased and transmitted to the front wheels via the differential case and the axle.

  In addition, in vehicles equipped with a motor for driving a vehicle, including the hybrid vehicle disclosed in Patent Document 1, a resolver that is a magnetic rotation angle sensor is widely used to detect the rotation angle of the motor. .

  For example, in the drive device disclosed in Patent Document 1, a resolver is disposed on the opposite side of the motor on the axle, and the resolver stator is fixed to the case housing the motor with a bolt in the resolver. The resolver rotor disposed on the radially inner side of the resolver stator is fixed to an extension portion in which the rotor shaft of the motor is extended to the side opposite to the differential gear with respect to the bearing that supports the rotor shaft. Thus, the motor, the bearing, and the resolver are arranged in this order from the differential device side in the axial direction.

JP 2009-124822 A

  However, when the motor, the bearing, and the resolver are arranged side by side in the axial direction as in the driving device of Patent Document 1, the entire driving device is enlarged in the axial direction. Further, in other drive devices, conventionally, no special consideration has been given to the arrangement of the motor, the bearing, and the resolver so as to suppress the increase in the axial dimension of the drive device. There is room for improvement in terms of mountability.

  In addition to the bearings and resolver, various parts such as a speed reducer including a planetary gear mechanism may be arranged on the motor axis. In such a case, the axial dimension of the drive device may be reduced. Further increase, it may be difficult to secure an axial space for mounting the drive device.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to form a compact drive device in the axial direction in a drive device having a motor and a resolver.

  In order to solve the above-described problems, the drive device according to the present invention is configured as follows.

First, the invention according to claim 1 of the present application is
A motor having a rotor shaft; a case for housing the motor; a bearing interposed between the rotor shaft and the case; a resolver rotor that rotates integrally with the rotor shaft; and a radially outer side of the resolver rotor A drive device comprising a resolver having a disposed resolver stator,
The resolver stator is disposed so as to overlap the bearing in the axial direction.

A driving device according to a second aspect of the invention is the driving device according to the first aspect,
A recess provided on the inner surface of the case so as to form a breather chamber capable of communicating with the outer space of the case;
A bracket attached to the case so as to support the resolver stator on the case, and
The bracket includes a cover portion that covers the recess.

Further, the drive device according to the invention of claim 3 is the invention according to claim 1 or 2,
The resolver stator includes a connector connected to a harness outside the case,
The case includes an insertion hole penetrating the case in the axial direction,
The connector is inserted through the insertion hole.

Furthermore, in the invention according to any one of claims 1 to 3, the drive device according to the invention according to claim 4 is characterized in that:
The resolver stator is disposed so as to overlap in the axial direction a connecting wire space for passing the connecting wire of the motor.

  Here, the “crossover wire” means a wiring for electrically connecting a plurality of coils provided in the stator of the motor, an input line led from the external power supply side to the coil, and from the coil to the output side. This refers to the wiring in the case such as the output line that is led.

  First, according to the first aspect of the present invention, the resolver and the bearing are compactly arranged in the axial direction by arranging the bearing supporting the rotor shaft of the motor and the resolver stator so as to overlap in the axial direction. Will be. Therefore, the entire drive device having the motor, the bearing, and the resolver can be configured compactly in the axial direction, thereby improving the mountability of the drive device on a vehicle or the like.

  According to the second aspect of the present invention, a part of the bracket used for mounting the resolver stator is also used as a cover part that restricts the infiltration of oil into the breather chamber, so that a dedicated cover member is omitted. can do. Therefore, the number of parts and the number of assembly steps can be reduced.

  Furthermore, according to the invention of claim 3, the connector connected to the harness outside the case is provided in the resolver stator, and the connector is inserted into the insertion hole penetrating the case in the axial direction. The rotation of the resolver stator is restricted. Thereby, it is possible to position the resolver stator in the rotational direction using the connector. Therefore, a dedicated component for positioning the resolver stator in the rotation direction can be omitted, and the number of components and the number of assembly steps can be reduced.

  Furthermore, according to the invention described in claim 4, the resolver stator is arranged so as to overlap not only the bearing that supports the rotor shaft of the motor but also the crossover space of the motor in the axial direction. The resolver and the bearing can be arranged more compactly in the axial direction, which can further reduce the axial dimension of the drive device.

1 is an overall view showing a drive device according to an embodiment of the present invention. It is sectional drawing which shows a part of drive device shown in FIG. FIG. 3 is an enlarged view of FIG. 2 showing a main part of the drive device shown in FIG. 1. FIG. 4 is a cross-sectional view taken along line AA in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[overall structure]
As shown in FIG. 1, the drive device 1 according to the present embodiment is mounted on an FF hybrid vehicle. As a vehicle driving source, for example, an engine 2 mounted in an engine room, for example, And a motor 51 disposed on the drive shaft 30 connected to the right drive wheel 36.

  The engine 2 is a horizontal type, and a transaxle 3 is arranged in parallel on the left side of the engine 2 in the vehicle width direction, for example. The transaxle 3 includes, for example, a transmission 6 connected to the output shaft of the engine 2 via a torque converter 5 and a differential device 10 that transmits the output of the transmission 6 to the left and right drive shafts 30 and 40. ing.

  The transmission 6 is, for example, a stepped automatic transmission, but may be a manual transmission or a continuously variable transmission. The output gear 7 of the transmission 6 is meshed with a differential ring 14 that is fixed to the differential case 12 of the differential device 10, whereby the output of the engine 2 is transmitted via the transmission 6 to the differential case 12 of the differential device 10. Is transmitted to. The transmission mechanism and the differential device 10 of the transmission 6 are accommodated in the transaxle case 4.

  The differential device 10 and the left and right drive shafts 30, 40 connected thereto are disposed on the vehicle rear side with respect to the engine 2. The differential device 10 is disposed offset to the left side from the center in the vehicle width direction, and the right drive shaft 30 is longer than the left drive shaft 40.

  The drive shafts 30 and 40 include differential shaft members 31 and 41 connected to the differential 10 and intermediate shaft members 32 and 42 connected to the differential shaft members 31 and 41 through universal joints 34 and 44, respectively. And driving wheel side shaft members 33, 43 connected to the intermediate shaft members 32, 42 via universal joints 35, 45 on one end side and connected to driving wheels 36, 46 on the other end side. .

  In the differential device 10, a pair of pinion gears 16, 17 facing each other are rotatably provided on a pinion shaft 15 that penetrates the differential case 12, and the left and right side gears 18, straddle the pinion gears 16, 17. 19 is meshed. The differential case 12 is provided with left and right shaft insertion portions 12 a and 12 b corresponding to the side gears 18 and 19. The differential shaft members 31, 41 of the drive shafts 30, 40 are inserted into the shaft insertion portions 12a, 12b, and the distal ends of the differential shaft members 31, 41 are spline-fitted to the side gears 18, 19. As a result, the power transmitted from the transmission 6 to the differential case 12 of the differential device 10 is transmitted to the left and right drive shafts 30 and 40 so as to have a rotational difference corresponding to the traveling situation.

  On the differential shaft shaft 31 on the right side, a reduction gear 60 and a motor 51 are arranged in this order from the differential device 10 side. The motor 51 and the speed reducer 60 are unitized in a state of being accommodated in the unit case 110 and constitute the motor unit 50. The motor unit 50 is disposed using a space generated behind the engine 2 and on the right side of the differential 10.

[Motor unit structure]
As shown in FIG. 2, the unit case 110 includes a plurality of case members 111, 112, 113, and 114 that are coupled to each other.

  A support portion 118 formed in a half-crack shape so as to cover a half circumference of the differential side shaft member 31 is formed at the outer end portion in the vehicle width direction of the case member 113 constituting the end portion in the vehicle width direction outside of the unit case 110. Is provided. A bracket 120 formed in a half-crack shape so as to cover the remaining half circumference of the differential-side shaft member 31 is opposed to the support portion 118, and the support portion 118 and the bracket 120 are coupled by a bolt 122. Yes. As a result, the end of the differential shaft member 31 on the drive wheel 36 side is supported on the inner peripheral surface of the cylindrical portion formed by the support portion 118 and the bracket 120 via the bearing 108.

  An oil seal 106 interposed between the differential side shaft member 31 and the case member 113 so as to allow relative rotation thereof is disposed at a position adjacent to the differential device 10 side of the bearing 108. .

  The motor unit 50 includes a cylindrical partition member 100 extending in the axial direction so as to partition the speed reducer 60 and the motor 51 from the differential side shaft member 31. The differential side shaft member 31 penetrates the partition member 100, and a gap S <b> 1 (see FIG. 3) is provided between the inner peripheral surface of the partition member 100 and the outer peripheral surface of the differential side shaft member 31.

  The partition member 100 has a substantially constant inner diameter and outer diameter over the entire length. An end of the partition member 100 on the differential device 10 side is press-fitted into an inner peripheral surface of a sleeve 68 described later via an O-ring 102. Thereby, the partition member 100 rotates integrally with the sleeve 68. The end of the partition member 100 on the side opposite to the differential device 10 is rotatably supported by the case member 113 via an oil seal 104 that allows relative rotation between the partition member 100 and the case member 113.

  The motor 51 includes a stator 52 fixed to the case member 112, a rotor 53 disposed on the radially inner side of the stator 52, and a rotor shaft 54 fixed to the inner periphery of the rotor 53 so as to rotate integrally with the rotor 53. It has.

  The stator 52 is configured by winding a plurality of coils around a stator core made of a magnetic material. The rotor 53 is made of a cylindrical magnetic body, and rotates by a magnetic force generated when electric power is supplied to the stator 52. The stator 52 and the rotor 53 are accommodated in a motor accommodating space S <b> 2 formed by two case members 112 and 113.

  In the motor housing space S2, adjacent to the axially opposite differential device 10 side of the stator 52, a plurality of coils provided in the stator 52 and terminals on the input side and the output side connected to external devices are provided. A crossover space 58 through which a crossover for electrically connecting a provided connector (not shown) and the coil is passed is provided.

  The rotor shaft 54 is a cylindrical member that is fitted to the outside of the drive shaft 30 via the partition member 100, and is disposed with a gap on the outside of the partition member 100. A pair of bearings 55 and 56 are interposed between the rotor shaft 54 and the unit case 110. Thus, the rotor shaft 54 is supported by the case member 112 via the one bearing 55 on the differential device 10 side than the rotor 53, and the case via the other bearing 56 on the anti-differential device 10 side than the rotor 53. It is supported by the member 113.

  The speed reducer 60 is disposed adjacent to the motor 51 in the axial direction with the bearing 55 interposed therebetween, and includes a first planetary gear mechanism 60a and a second planetary gear mechanism 60b disposed on the differential side shaft member 31. . The first planetary gear mechanism 60a and the second planetary gear mechanism 60b are arranged in the axial direction in this order from the motor 51 side, and are accommodated in a reduction gear accommodating space S3 formed by two case members 111 and 112. .

  The first planetary gear mechanism 60a includes a first sun gear 61a as an input element, a first ring gear 62a as a reaction force element, and a first carrier 63a as an output element. Similarly, the second planetary gear mechanism 60b includes a second sun gear 61b as an input element, a second ring gear 62b as a reaction force element, and a second carrier 63b as an output element.

  The first ring gear 62 a and the second ring gear 62 b are an integral member composed of a common ring gear member 62. The ring gear member 62 is splined to the inner peripheral surface of the case member 111. Thereby, the 1st, 2nd ring gears 62a and 62b are being fixed to unit case 110 so that rotation is impossible. However, the first ring gear 62a and the second ring gear 62b may be configured as separate members.

  The first sun gear 61 a and the second sun gear 61 b are annular parts fitted to the outside of the drive shaft 30 through the partition member 100, and are arranged with a gap on the outside of the partition member 100.

  The first sun gear 61a is provided integrally with the rotor shaft 54 of the motor 51, whereby the output of the motor 51 is input to the first sun gear 61a. Since the first ring gear 62a is fixed, the rotation input to the first sun gear 61a is decelerated by the first planetary gear mechanism 60a and output from the first carrier 63a.

  The second sun gear 61b is provided integrally with the first carrier 63a, whereby the output of the motor 51 decelerated by the first planetary gear mechanism 60a is input to the second sun gear 61b. Since the second ring gear 62b is fixed, the rotation input to the second sun gear 61b is decelerated by the second planetary gear mechanism 60b and output from the second carrier 63b.

  A sleeve 68 extending in the axial direction toward the differential device 10 is provided at the inner peripheral end of the second carrier 63b. The sleeve 68 is provided integrally with the second carrier 63 b or is connected to the second carrier 63 b so as to rotate integrally therewith, whereby the sleeve 68 functions as an output element of the speed reducer 60.

  The tip of the sleeve 68 extends to the differential device 10 side than the tip of the case member 114 so as to protrude to the outside of the unit case 110. The outer peripheral surface at the tip of the sleeve 68 is spline-fitted to the inner peripheral surface of the right shaft insertion portion 12 a in the differential case 12 of the differential device 10. As a result, the sleeve 68 rotates integrally with the differential case 12.

  When the motor 51 is driven, the power of the motor 51 is transmitted to the differential case 12 via the speed reducer 60. Therefore, when the motor 51 is driven while the engine 2 is being driven, the power from the motor 51 is integrated with the power from the engine 2 in the differential case 12, and this integrated power is driven through the drive shafts 30 and 40. 36, 46. Thereby, the torque assist function by the motor 51 is fulfilled. When the motor 51 is driven with the engine 2 stopped, the power from the motor 51 is transmitted to the drive wheels 36 and 46 via the differential device 10 and the drive shafts 30 and 40, Motor traveling using only the motor 51 as a drive source is realized.

  Further, the output of the motor 51 is decelerated by the first planetary gear mechanism 60a, and the decelerated output is further decelerated by the second planetary gear mechanism 60b and transmitted to the differential case 12 of the differential device 10. By such two-stage deceleration, the torque transmitted from the motor 51 to the differential case 12 is sufficiently increased. Therefore, the motor 51 can be reduced in size, and the motor unit 50 can be reduced in size. The in-vehicle performance of the motor unit 50 is improved.

  However, the speed reducer 60 may be configured by one or three or more planetary gear mechanisms. Further, the present invention does not prevent the reduction gear 60 from being omitted.

  The power transmission path from the motor 51 configured as described above to the differential case 12 is independent of the power transmission path from the engine 2 to the differential case 12. Therefore, the motor unit 50 assembled in advance is mounted on the drive shaft 30 without changing the configuration related to the power transmission path on the engine 2 side, and the sleeve 68 of the motor unit 50 is attached to the shaft insertion portion 12a of the differential case 12. Therefore, the power transmission path from the motor 51 to the differential case 12 can be easily constructed simply by being fitted to the spline. Therefore, the engine vehicle can be easily changed to a hybrid vehicle simply by adding the motor unit 50 in this way.

  In the unit case 110, an oil reservoir 80 formed by two case members 112 and 113 is provided. The oil reservoir 80 cools the motor 51 and reduces the speed reducer 60 and the bearings 55 and 56. The oil for lubricating etc. is stored.

  In the unit case 110, a gear type oil pump 98 is disposed on the differential device 10 side of the speed reducer 60. When the oil pump 98 is actuated, the oil stored in the oil storage unit 80 includes a strainer 82 disposed in the oil storage unit 80, and oil passages 83 and 84 formed in the case members 111 and 112. And is sucked into the oil pump 98.

  The oil discharged from the oil pump 98 is guided to the reduction gear housing space S3 and the motor housing space S2 through an oil passage 88 formed along the outer periphery of the partition member 100. Specifically, the oil flowing through the oil passage 88 passes through the oil hole 90 provided in the connecting portion between the first carrier 63a and the second sun gear 61b, or the connecting portion between the first sun gear 61a and the rotor shaft 54 of the motor 51. The motor is accommodated through the provided oil hole 91 or the like and supplied to the reduction gear housing space S3 or through the oil holes 92 and 93 provided in the rotor shaft 54 or the oil hole 96 or the like provided in the case member 113. Or supplied to the space S2. Thus, the reducer 60 and the like are lubricated and the motor 51 is cooled by the oil supplied to the reducer housing space S3 and the motor housing space S2.

  Furthermore, the oil used for lubricating the reduction gear 60 in the reduction gear housing space S3 is guided to the motor housing space S2 through, for example, oil passages 94 and 95 formed in the case member 112, and in the motor housing space S2. The oil used for cooling the motor 51 is returned to the oil reservoir 80 through an oil passage 97 formed in the case member 113, for example.

  The oil path 88 along the outer surface of the partition member 100 is sealed with an O-ring 102 on the differential device 10 side, and is sealed with an oil seal 104 on the anti-differential device 10 side. Therefore, the oil in the unit case 110 is sealed from the radially inner side by the partition member 100. Further, since the other portions are also sealed by the oil seal 115 or the like, the motor unit 50 is configured so that oil is sealed in the unit case 110 in an oil-tight state.

  The motor unit 50 also includes a breather chamber 134 for releasing the internal pressure of the unit case 110. Further, the motor unit 50 includes a resolver 70 that detects the rotation angle of the motor 51. Hereinafter, the breather chamber 134 and the resolver 70 will be described in order.

[Breeza room]
As shown in FIGS. 2 and 3, a side wall portion 130 disposed adjacent to the counter differential device 10 side of the motor housing space S <b> 2 at the end of the unit case 110 of the motor unit 50 on the side of the counter differential device 10 in the axial direction. Is provided. The side wall 130 is configured by the case member 113.

  As shown in FIG. 3, a recess 132 is provided on the inner surface of the side wall 130 so as to form a breather chamber 134 that can communicate with the outer space S4 of the unit case 110. The concave portion 132 is covered with a cover portion 143 provided on the bracket 140 described later, and a space surrounded by the cover portion 143 and the concave portion 132 is a breather chamber 134.

  The breather chamber 134 is disposed in the vicinity of the upper end of the side wall 130. The infiltration of oil from the motor housing space S <b> 2 into the breather chamber 134 is regulated by the cover portion 143 of the bracket 140. The breather chamber 134 communicates with the motor housing space S <b> 2 via a communication hole 144 that penetrates the cover portion 143. Further, the breather chamber 134 can communicate with the outer space S4 of the unit case 110 via a breather 136 attached to the upper wall portion 135 so as to penetrate the upper wall portion 135 of the breather chamber 134. .

  When the internal pressure of the unit case 110 rises, the internal pressure is released to the outer space S4 of the unit case 110 through the breather chamber 134 and the breather 136. At this time, the oil that flows into the breather chamber 134 together with the air adheres to the wall surface of the breather chamber 134 and temporarily stays there, and then passes through the gap between the cover portion 143 and the inner surface of the side wall portion 130, for example. Thus, the ejection of oil into the outer space S4 of the unit case 110 is suppressed.

  In this way, the excessive increase in the internal pressure of the unit case 110 is suppressed, so that the load applied to each oil seal 104, 106, 115 provided in the motor unit 50 is reduced, whereby the oil seal 104, By protecting 106 and 115, the oil tightness of the unit case 110 is maintained.

[Resolver]
As shown in FIGS. 2 and 3, the resolver 70 is disposed in the vicinity of the bearing 56 on the side of the anti-differential device 10 that supports the rotor shaft 54 of the motor 51 in the motor housing space S <b> 2.

  As shown in FIG. 3, the bearing 56 includes, for example, an inner race 56 a fixed to the outer periphery of the rotor shaft 54 and an annular protrusion 137 that protrudes from the side wall portion 130 of the unit case 110 toward the axial differential device 10. The ball bearing includes an outer race 56b fixed to the inner periphery and a plurality of balls 56c interposed between the inner race 56a and the outer race 56b. However, the type of the bearing 56 is not limited to the ball bearing, and may be a roller bearing, for example.

  As shown in FIGS. 3 and 4, the resolver 70 is disposed on the radially outer side of the resolver rotor 78 and the resolver rotor 78 provided on the rotor shaft 54 so as to rotate integrally with the rotor shaft 54 of the motor 51. The resolver stator 71 is provided.

  The resolver rotor 78 is an annular plate member made of a magnetic material, and is fixed to the outer periphery of the rotor shaft 54 by press-fitting, for example. The resolver rotor 78 has, for example, an elliptical outline, but the outline shape of the resolver rotor 78 is not particularly limited as long as the outer diameter varies depending on the circumferential position. The resolver rotor 78 is disposed adjacent to the differential device 10 side of the bearing 56 in the axial direction and adjacent to the anti-differential device 10 side of the oil hole 93 provided in the rotor shaft 54.

  The resolver rotor 78 is provided with an oil hole 79 that passes through the resolver rotor 78. The oil hole 79 is disposed so as to overlap the ball 56c of the bearing 56 in the radial direction. Therefore, the oil supplied to the motor housing space S2 through the oil hole 93 of the rotor shaft 54 is easily guided between the inner race 56a and the outer race 56b of the bearing 56 through the oil hole 79 of the resolver rotor 78. Thus, the bearing 56 can be lubricated satisfactorily.

  The resolver stator 71 includes an annular stator core 72 made of a magnetic material and a coil 74 attached to the stator core 72. The coil 74 is provided with a plurality of coils including an excitation coil that generates magnetism by a current supplied from the outside and a detection coil for obtaining an output current. It is detected based on the phase of the flowing output current.

  As shown in FIG. 3, the coil 74 attached to the stator core 72 is disposed so as to protrude from the stator core 72 on both sides in the axial direction. The resolver stator 71 has a larger axial dimension than the resolver rotor 78, and is disposed so as to protrude from the resolver rotor 78 toward the differential device 10 side and the anti-differential device 10 side in the axial direction.

  The resolver stator 71 includes a connector 76 having input side and output side terminals electrically connected to the coil 74. The connector 76 has, for example, a cylindrical outer shape having a cylindrical outer peripheral surface and a pair of circular end surfaces, and a terminal is provided on one end surface side of the connector 76. The connector 76 is disposed adjacent to the axial anti-differential device 10 side at a predetermined circumferential position of the stator core 72 so that the terminal faces the axial anti-differential device 10 side. A terminal of another connector connected to a harness outside the unit case 110 is connected to the terminal of the connector 76.

  The stator core 72, the coil 74, and the connector 76 are fixed to each other by being integrated by, for example, a resin mold. Thereby, since the connector 76 can be attached to the unit case 110 in a state of being integrated with the stator core 72, the assembling property of the resolver stator 71 is improved. The configuration for fixing the connector 76 to the stator core 72 is not limited to the resin mold, and may be fixed using, for example, screws.

  As shown in FIGS. 3 and 4, the resolver stator 71 is fixed to the unit case 110 via a bracket 140. The bracket 140 includes an annular base plate portion 142 attached to the inner surface of the side wall portion 130 of the unit case 110, a cylindrical portion 145 extending from the radially inner end of the base plate portion 142 toward the axial differential device 10, and a cylindrical shape. And an annular protrusion 146 that protrudes radially inward from the tip of the portion 145.

  The base plate part 142 is fixed to the inner surface of the side wall part 130 by, for example, a plurality of bolts 148. The cover portion 143 is provided on the upper end portion of the base plate portion 142. The cover portion 143 has a shape that covers the entire concave portion 132 of the side wall portion 130, and thus the intrusion of oil into the breather chamber 134 is restricted by the cover portion 143. Since this cover part 143 is comprised by a part of bracket 140 used for attachment of the resolver stator 71, a dedicated cover member for closing the recessed part 132 can be omitted. Man-hours can be reduced.

  The inner peripheral surface of the cylindrical portion 145 is disposed to face the outer peripheral surface of the stator core 72 of the resolver stator 71. The inner diameter of the cylindrical portion 145 is substantially equal to the outer diameter of the stator core 72, whereby the stator core 72 is positioned in the radial direction by the cylindrical portion 145.

  The annular protrusion 146 is arranged along the surface on the differential device 10 side of the outer edge of the stator core 72. Further, the axial movement of the outer edge portion of the stator core 72 toward the anti-differential device 10 is restricted by a positioning portion 139 (see FIG. 2) protruding from the inner surface of the side wall portion 130 of the unit case 110. Accordingly, the stator core 72 is positioned in the axial direction by being sandwiched from both sides in the axial direction by the annular protrusion 146 of the bracket 140 and the positioning portion 139 of the unit case 110.

  Thus, the resolver stator 71 is fixed to the unit case 110 by positioning the stator core 72 in the radial direction and the axial direction using the bracket 140.

  Further, the side wall portion 130 of the unit case 110 is provided with an insertion hole 138 penetrating the side wall portion 130 in the axial direction, and the connector 76 of the resolver 70 is inserted into the insertion hole 138. The inner diameter of the insertion hole 138 is substantially equal to the outer diameter of the connector 76, thereby restricting the movement of the connector 76 in the radial direction of the insertion hole 138. The connector 76 is inserted into the insertion hole 138 so as to penetrate the side wall portion 130, whereby an external connector can be connected to the connector 76 outside the unit case 110.

  By inserting the connector 76 into the insertion hole 138 passing through the unit case 110 in the axial direction in this way, the connector 76 is locked to the unit case 110 so that the movement of the resolver stator 71 in the circumferential direction is restricted. Has been. Thereby, since the rotation of the resolver stator 71 integrated with the connector 76 is restricted as described above, the resolver stator 71 can be positioned in the rotation direction using the connector 76. Therefore, a dedicated part for positioning the resolver stator 71 in the rotation direction can be omitted, and the number of parts and the number of assembly steps can be reduced.

  In the present embodiment, the insertion hole 138 and the connector 76 are provided at a circumferential position corresponding to the upper end portion of the resolver stator 71, but the insertion hole 138 and the connector 76 can be arranged at any position in the circumferential direction. is there.

  As described above, the resolver 70 attached to the unit case 110 is arranged in the motor housing space S2 by using a small space that is generated radially inside the connecting wire space 58 for the motor 51.

  Specifically, the resolver rotor 78 is arranged inside the connecting wire space 58 in the radial direction and so as to overlap with the bearing 56, and overlaps with the connecting wire space 58 in the axial direction and of the bearing 56. It is arranged adjacent to the axial differential 10 side.

  The stator core 72 of the resolver stator 71 is disposed on the outer side of the bearing 56 in the radial direction and on the inner side of the connecting wire space 58, and overlaps with the connecting wire space 58 in the axial direction and is different from the bearing 56. It is arranged on the moving device 10 side.

  The coil 74 of the resolver stator 71 is disposed outside the bearing 56 and inside the connecting wire space 58 in the radial direction, and is arranged so as to overlap the connecting wire space 58 and the bearing 56 in the axial direction. Yes.

  Thus, in this embodiment, the resolver stator 71 and the bearing 56 are arranged compactly in the axial direction by arranging the resolver stator 71 so as to overlap the bearing 56 and the crossover space 58 in the axial direction. Will be. Therefore, for example, the motor 51, the bearing 56, and the resolver 70 are compared with those in which the rotor shaft 54 is extended to the side opposite to the differential differential device 10 from the bearing 56 and the resolver 70 is disposed in the extended portion as in the prior art. It is possible to configure the motor unit 50 having a compact overall in the axial direction, thereby improving the mountability of the motor unit 50 on the vehicle.

  Further, the connector 76 of the resolver stator 71 is disposed outside the bearing 56 and the oil seal 104 in the radial direction and inside the crossover space 58 and the breather chamber 134, and in the axial direction, the connector 56, the oil seal 104, and It arrange | positions so that the breather chamber 134 may overlap. Thus, the connector 76 is attached to the unit case 110 using the axial space in which the bearing 56, the oil seal 104, and the breather chamber 134 are disposed. An increase in the axial dimension can be suppressed, whereby the more effective motor unit 50 can be made more compact.

  While the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

  For example, in the above-described embodiment, the present invention has been described by exemplifying a drive device mounted on an FF type hybrid vehicle. The present invention can be applied to various types of vehicles such as a wheel drive type or a front engine / rear drive type (FR type) vehicle or a drive device mounted on other vehicles.

  As described above, according to the present invention, in a drive device having a motor and a resolver, the drive device can be configured to be compact in the axial direction. It may be suitably used in the manufacturing industry field.

DESCRIPTION OF SYMBOLS 1 Drive device 2 Engine 3 Transaxle 4 Transaxle case 5 Torque converter 6 Transmission 10 Differential device 12 Differential case 30, 40 Drive shaft 31, 41 Differential side shaft member 50 Motor unit 51 Motor 52 Stator 53 Rotor 54 Rotor shaft 56 Bearing 58 Crossover space 60 Reducer 60a First planetary gear mechanism 60b Second planetary gear mechanism 70 Resolver 71 Resolver stator 72 Stator core 74 Coil 76 Connector 78 Resolver rotor 79 Oil hole 100 Partition member 104 Oil seal 110 Unit case 113 Case member 130 Side wall part 132 Recess 134 Breather chamber 136 Breather 137 Annular projection 138 Insertion hole 140 Bracket 143 Cover S2 Motor accommodation Space S4 Outer space

Claims (4)

A motor having a rotor shaft; a case for housing the motor; a bearing interposed between the rotor shaft and the case; a resolver rotor that rotates integrally with the rotor shaft; and a radially outer side of the resolver rotor A drive device comprising a resolver having a disposed resolver stator,
The resolver stator is disposed so as to overlap the bearing in the axial direction. A recess provided on the inner surface of the case so as to form a breather chamber capable of communicating with the outer space of the case;
A bracket attached to the case so as to support the resolver stator on the case, and
The drive device according to claim 1, wherein the bracket includes a cover portion that covers the concave portion. The resolver stator includes a connector connected to a harness outside the case,
The case includes an insertion hole penetrating the case in the axial direction,
The drive device according to claim 1, wherein the connector is inserted through the insertion hole.   The said resolver stator is arrange | positioned so that the connecting wire space for letting the connecting wire of the said motor pass may be arrange | positioned in an axial direction. Drive device.

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