JP2016101879A - Drive device for vehicle and assembly method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve improvement of workability in maintenance of a drive shaft, in a drive device of a vehicle having a motor disposed on the drive shaft.SOLUTION: In a vehicle including a drive shaft 30 for connecting an output unit 18 of a differential device 10 and a drive wheel 36, and a motor 51 disposed on the drive shaft 30 so that power can be transmitted to an input unit 12 of the differential device 10, a cylindrical partition member 100 for partitioning the drive shaft 30 and the motor 51 is disposed on the outside of the drive shaft 30 and on the inside of the motor 51 in a radial direction, and an inner diameter of the partition member 100 is made to be larger than an outer diameter of a maximum diameter part 31a of an axial direction portion located further on the differential device side than a drive wheel side end part of the partition member 100 in the drive shaft 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drive device for a vehicle having a motor disposed on a drive shaft.

  2. Description of the Related Art In recent years, various types of vehicle drive devices have been proposed or put into practical use with the practical use of hybrid vehicles equipped with an engine and a motor as drive sources.

  Patent Document 1 discloses a structure in which a motor is disposed on one drive shaft in a front engine / front drive type (FF type) hybrid vehicle including an engine and a motor as drive sources. In this hybrid vehicle, the output of the motor is transmitted to the differential case of the differential device through a speed reducer comprising a planetary gear mechanism disposed on the drive shaft adjacent to the motor. As a result, when the motor is driven, the power transmitted from the engine via the transmission and the power transmitted from the motor via the speed reducer merge in the differential case, and this combined power is applied to the drive shaft. To the drive wheels.

  In the drive device disclosed in Patent Document 1, as in a general FF type engine vehicle, a transmission and a differential device are integrated to form a transaxle, and the transaxle is integrated in advance. It is assembled on the side of the engine in a state of being made into a state. Further, in this drive device, the motor constitutes a motor unit by being integrated with the speed reducer and one of the drive shafts, and the motor unit is integrated in advance with the transaxle differential device. Assembled into.

JP 2011-031761 A

  By the way, normally, the drive shaft is composed of a plurality of shaft members connected through a universal joint, and a joint boot for sealing the lubricating oil and preventing foreign matter from entering is attached to the universal joint. . When components of the drive shaft such as the joint boot or the shaft member itself are damaged, the entire drive shaft may have to be removed from the differential device for maintenance such as replacement of the components.

  However, when the drive shaft is integrated with peripheral parts such as a motor to form an assembly body as in the motor unit disclosed in Patent Document 1, in order to remove the drive shaft from the differential device, the entire assembly body After the removal, it is further necessary to remove the drive shaft from the assembly body. In addition, after the maintenance of the drive shaft, it is necessary to reassemble the assembly by reassembling the peripheral parts to the drive shaft, and then to assemble the assembly to the differential device.

  Even if it is physically possible to extract only the drive shaft while maintaining the assembled state of the assembly parts other than the drive shaft, the outer peripheral surface of the drive shaft and the inner surface of the case of the assembly body Since oil for motor cooling or reduction gear lubrication is enclosed between the two, the oil leaks when the drive shaft is pulled out, and there is a problem that it takes time and cost to re-enclose the oil after maintenance. is there.

  Therefore, an object of the present invention is to improve workability in maintenance of a drive shaft in a vehicle drive device having a motor disposed on the drive shaft.

  In order to solve the above-described problems, a vehicle drive device and an assembly method thereof according to the present invention are configured as follows.

First, the invention according to claim 1 of the present application is
A drive device for a vehicle, comprising: a drive shaft that connects an output portion of a differential device and drive wheels; and a motor that is disposed on the drive shaft so as to be able to transmit power to the input portion of the differential device. There,
A cylindrical partition member that partitions the drive shaft and the motor is disposed outside the drive shaft and inside the motor in the radial direction,
An inner diameter of the partition member is larger than an outer diameter of a maximum diameter portion of an axial portion located on the differential device side with respect to a drive wheel side end portion of the partition member in the drive shaft.

According to a second aspect of the present invention, there is provided a vehicle drive device according to the first aspect of the present invention.
An oil pump is disposed on the drive shaft;
The outer surface of the partition member is a guide portion that guides the oil discharged from the oil pump to the motor.

Furthermore, the vehicle drive device according to the invention of claim 3 is the invention according to claim 1 or 2,
A case for housing the motor;
A planetary gear mechanism disposed on the drive shaft to decelerate and transmit the output of the motor to the input portion of the differential device,
One end side of the partition member is fixed to an output element of the planetary gear mechanism,
The other end side of the partition member is rotatably supported by the case via a seal member.

According to a fourth aspect of the present invention, there is provided an assembling method for a vehicle driving device.
A drive unit set for a vehicle, comprising: a drive shaft that connects an output portion of the differential device and drive wheels; and a motor that is disposed on the drive shaft so that power can be transmitted to the input portion of the differential device. A method of attaching,
Assembling the motor and a cylindrical partition member inserted radially inward of the motor to construct a motor unit having the motor and the partition member,
In a state where the motor unit is assembled to the differential device, one end side of the drive shaft is inserted into the partition member from the anti-differential device side and assembled to the output portion of the differential device. To do.

  First, according to the first aspect of the present invention, when the drive shaft disposed inside the partition member is pulled out while maintaining the in-vehicle state of the cylindrical partition member, the outer peripheral surface of the drive shaft is partitioned. Interference with the inner peripheral surface of the member can be avoided. Therefore, when a joint boot or the like constituting the drive shaft is damaged, maintenance can be performed by removing only the drive shaft while maintaining the on-vehicle state of the motor and the partition member. In addition, after maintenance of the drive shaft, it is easy to assemble the drive shaft to the vehicle body by inserting one end of the drive shaft into the inside of the partition member maintained in-vehicle and attaching it to the output section of the differential device. And can be completed quickly.

  Further, when the drive shaft is attached and detached in this manner, the partition member maintained in the on-vehicle state prevents leakage of oil for cooling the motor or the like enclosed outside the partition member, so the oil is re-encapsulated. It is possible to avoid labor and cost. Therefore, according to the present invention, it is possible to simplify and speed up the maintenance work of the drive shaft.

  According to the second aspect of the present invention, the oil discharged from the oil pump can be guided to the motor along the outer surface of the partition member. Furthermore, since oil is held on the outer side of the partition member arranged outside the drive shaft in the radial direction, the oil is sealed so as to contact the outer peripheral surface of the drive shaft as in the conventional structure where no partition member is provided. Compared with the case where it is done, it can avoid that excess oil accumulates in the part along the outer peripheral surface of a drive shaft. Therefore, the amount of oil sealed in the drive device can be reduced, thereby reducing the weight of the drive device and thus improving the fuel consumption.

  Furthermore, according to the invention described in claim 3, since the one end side of the partition member is fixed to the output element of the planetary gear mechanism that rotates at a lower speed than the motor, the partition member and the case that supports the partition member are fixed. The relative rotational speed can be reduced, whereby the load applied to the seal member interposed between the other end of the partition member and the case is reduced, and the sealing performance of the seal member can be improved.

  In general, a seal member attached between members that rotate relative to each other requires a larger installation space than a member attached between members that do not rotate relative to each other in order to exhibit a function of allowing relative rotation. If a seal member that allows relative rotation is interposed between the one end side of the partition member and the output element of the planetary gear mechanism, the output element and its peripheral parts are installed to secure the installation space for the seal member. For example, it is necessary to displace the outer side in the radial direction and the like, which reduces the degree of freedom in layout and increases the size of the apparatus. On the other hand, according to the present invention, the seal member that allows relative rotation is interposed between the partition member and the case, not between the partition member and the output element, so the shape of the case is changed. It is possible to easily secure the installation space for the seal member simply by doing so.

  Furthermore, according to the invention described in claim 4, the motor unit is constructed in advance by assembling the motor and the cylindrical partition member inserted inward in the radial direction of the motor. In the state assembled to the device, one end portion of the drive shaft is inserted into the inside of the partition member to be assembled to the output portion of the differential device. In a vehicle in which the drive shaft is assembled in this way, when the joint boot or the like constituting the drive shaft is damaged, only the drive shaft is maintained while maintaining the in-vehicle state of the motor unit having the motor and the partition member. It can be removed for maintenance. In addition, after maintenance of the drive shaft, it is easy to assemble the drive shaft to the vehicle body by inserting one end of the drive shaft into the inside of the partition member maintained in-vehicle and attaching it to the output section of the differential device. And can be completed quickly.

1 is an overall view showing a vehicle 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. It is an exploded view for demonstrating the attachment or detachment procedure of a motor unit and a drive shaft.

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

[overall structure]
As shown in FIG. 1, a vehicle drive device 1 according to the present embodiment is mounted on an FF hybrid vehicle. As a vehicle drive source, for example, an engine 2 mounted in an engine room and For example, a motor 51 disposed on the drive shaft 30 connected to the right drive wheel 36 is provided. However, the motor 51 may be disposed on the drive shaft 40 connected to the left drive wheel 46.

  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.

  A reduction gear 60 and a motor 51 are arranged on the right differential shaft members 31 and 41 in order from the differential 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 case member 113 that constitutes an end of the unit case 110 on the outer side in the vehicle width direction is attached to a cylinder block of the engine 2 via a bracket 124.

  Further, 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 provided at an outer end portion in the vehicle width direction of the case member 113. 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. (See FIG. 4). 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 drive wheel 36 side 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 rotatably provided inside the stator 52, and an output shaft 54 fixed inside the rotor 53 so as to rotate integrally with the rotor 53. It has.

  The stator 52 is configured by winding a coil 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.

  The output shaft 54 is disposed outside the partition member 100 with a gap, supported by the case member 112 via the bearing 55 on the differential device 10 side of the rotor 53, and on the drive wheel 36 side of the rotor 53. Are supported by the case member 113 via a bearing 56.

  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.

  The first sun gear 61 a and the second sun gear 61 b are disposed outside the partition member 100 with a gap. The first sun gear 61a is provided integrally with the output 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.

  Therefore, the sleeve 68 rotates at a lower speed than the motor 51, so that the rotation of the partition member 100 fixed to the sleeve 68 as described above is also slower than the motor 51. Therefore, the relative rotational speed between the case member 113 that supports the end portion of the partition member 100 on the drive wheel 36 side and the partition member 100 can be reduced, so that the intermediate member is interposed between the partition member 100 and the case member 113. The load applied to the mounted oil seal 104 is reduced, and the sealing performance of the oil seal 104 can be improved.

  Also, if an oil seal that allows these relative rotations is interposed between the end portion of the partition member 100 on the differential device 10 side and the sleeve 68, an installation space for the oil seal is secured. Therefore, it is necessary to displace the sleeve 68 radially outward and to dispose the peripheral components such as the oil pump 70 on the radially outer side or the axial differential device 10 side. The degree of freedom of the layout is reduced, and the motor unit 50 is increased in size in the radial direction or the axial direction.

  On the other hand, in this embodiment, the oil seal 104 that allows relative rotation is interposed between the partition member 100 and the case member 113 instead of between the partition member 100 and the sleeve 68. By simply changing the shape of the case member 113, the installation space for the oil seal 104 can be easily secured, and the enlargement of the motor unit 50 can be avoided.

  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. Therefore, when the motor 51 is driven, the power of the motor 51 is transmitted to the differential case 12 via the speed reducer 60. As a result, the power of the engine 2 and the power of the motor 51 are combined in the differential case 12, and the combined power is transmitted to the drive wheels 36 and 46 via the drive shafts 30 and 40.

  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.

  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. The oil reservoir 80 is disposed so as to overlap the motor storage space S2 in the axial direction.

  In the unit case 110, a gear type oil pump 70 is disposed on the differential device 10 side of the speed reducer 60. When the oil pump 70 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 70. The oil discharged from the oil pump 70 is guided to the reduction gear housing space S3 and the motor housing space S2 through the oil passage 88 formed along the outer periphery of the partition member 100, and thereby the reduction gear 60. Etc. are lubricated and the motor 51 is cooled.

  The oil used to lubricate 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 the motor 51 in the motor housing space S2. The oil used for cooling is returned to the oil reservoir 80 through an oil passage 97 formed in the case member 113, for example.

  As shown in FIG. 3, the oil pump 70 is an internal gear pump in which the outer teeth of the inner gear 72 and the inner teeth of the outer gear 74 are meshed in part in the circumferential direction. The inner gear 72 is fixed to the outer peripheral surface of the sleeve 68 by, for example, spline fitting or press fitting, and rotates together with the sleeve 68. The outer gear 74 is positioned in the radial direction and the axial direction by being accommodated in a circumferential groove formed by the two case members 111 and 114, and rotates with the rotation of the inner gear 72.

  A suction port 85 formed in the case member 111 is disposed on the motor 51 side in the axial direction across the oil pump 70, and a discharge formed in the case member 114 is disposed on the differential device 10 side in the axial direction. A port 86 is provided. The case member 111 is provided with a relief valve 78 communicating with the suction port 85. When the hydraulic pressure of the suction port 85 is excessively increased, the relief valve 78 is opened to accommodate the reduction gear from the suction port 85. Oil is allowed to escape into the space S3.

  The suction port 85 communicates with the oil passage 84 (see FIG. 2). When the oil pump 70 is driven by the rotation of the sleeve 68, the oil supplied from the oil reservoir 80 through the oil passage 84 is supplied. Is sucked from the suction port 85 between the inner gear 72 and the outer gear 74 and discharged from the discharge port 86.

  The oil discharged from the discharge port 86 is guided to the oil passage 88 formed along the outer surface of the partition member 100 through the oil hole 87 provided in the sleeve 68. The oil passage 88 extends in the axial direction along the outer surface of the partition member 100 from the communicating portion with the oil hole 87 to the oil seal 104 provided at the end of the partition member 100 on the drive wheel 36 side. Is formed. The oil guided to the oil passage 88 flows in the axial direction toward the drive wheel 36 while being guided by the outer surface of the partition member 100.

  The oil flowing through the oil passage 88 in this manner is provided in the oil hole 90 provided in the connecting portion between the first carrier 63a and the second sun gear 61b, or in the connecting portion between the first sun gear 61a and the output shaft 54 of the motor 51. The oil is supplied to the reduction gear housing space S3 through the oil hole 91 and the like, or is supplied to the motor housing space S2 through the oil holes 92 and 93 provided in the output shaft 54. As described above, the outer surface of the partition member 100 constituting the oil passage 88 functions as a guide portion that guides the oil discharged from the oil pump 70 to the motor 51 and the speed reducer 60.

  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 sealed with an oil seal 104 on the drive wheel 36 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.

  One of the features of the motor unit 50 described above is that it includes the partition member 100 that partitions the drive shaft 30 and the motor 51 as described above.

  By providing the partition member 100, the oil sealed in the unit case 110 is held radially outside the partition member 100, and the inside of the partition member 100, that is, the drive shaft 30. Oil does not enter the part along the outer peripheral surface.

  Therefore, as compared with the case where oil is sealed so as to come into contact with the outer peripheral surface of the drive shaft as in the conventional structure in which no partition member is provided, excess oil stays in a portion along the outer peripheral surface of the drive shaft 30. You can avoid that. Therefore, the amount of oil sealed in the unit case 110 can be reduced, and thereby the weight of the motor unit 50 can be reduced, and the fuel efficiency can be improved.

  Further, since the partition member 100 is provided in the motor unit 50, the motor unit 50 and the right drive shaft 30 on which the motor unit 50 is disposed are assembled to the vehicle body according to the following procedure, and the vehicle body Will be removed.

[Motor unit and drive shaft attachment / detachment procedures]
As shown in FIG. 4, when the motor unit 50 and the drive shaft 30 are assembled to the vehicle body, the above-described motor unit 50 is constructed in advance by assembling various components such as the motor 51, the speed reducer 60, and the partition member 100. Keep it.

  In this case, the drive shaft 30 is constructed in advance by connecting the differential side shaft member 31, the intermediate shaft member 32, and the drive wheel side shaft member 33 via the two universal joints 34 and 35.

  When assembled to the vehicle body, the motor unit 50 and the drive shaft 30 are individually assembled to the transaxle 3 in the vehicle-mounted state.

  Specifically, first, the tip of the sleeve 68 of the motor unit 50 assembled in advance is inserted into, for example, the right shaft insertion portion 12a of the differential case 12 of the transaxle 3, and these are spline-fitted, and the unit case 110 Is fixed to the cylinder block or the like of the engine 2 so that the motor unit 50 is assembled to the vehicle body.

  Subsequently, in a state where the motor unit 50 is assembled to the differential device 10 as described above, the differential-side shaft member 31 of the drive shaft 30 is inserted into the partition member 100 of the motor unit 50 from the non-differential device 10 side. Thus, the tip end portion of the differential side shaft member 31 is protruded to the side opposite to the driving wheel from the tip end of the sleeve 68 of the motor unit 50.

  At this time, the maximum diameter portion of the differential side shaft member 31 in the portion that passes through the inside of the partition member 100 is the enlarged diameter portion 31 a provided in the vicinity of the tip of the differential side shaft member 31. Is smaller than the inner diameter of the partition member 100. Therefore, the differential shaft member 31 can be inserted inside the partition member 100 as described above. Further, in the motor unit 50, there are no parts arranged radially inward of the partition member 100. Therefore, when the differential shaft member 31 is inserted into the partition member 100 as described above, It is possible to prevent the differential shaft member 31 from interfering with the component parts.

  Subsequently, the tip end portion of the differential shaft member 31 protruding to the side opposite to the driving wheel from the sleeve 68 is inserted into the side gear 18 of the differential device 10, and these are spline-fitted. As a result, the drive shaft 30 is assembled to the differential device 10.

  Subsequently, the end portion on the drive wheel 36 side of the differential side shaft member 31 is sandwiched between the support portion 118 of the half-cracked motor unit 50 and the bracket 120 from the outside of the bearing 108 previously mounted on the outer periphery thereof, These are fastened with bolts 122. As a result, the end of the differential shaft member 31 on the drive wheel 36 side is rotatably supported by the support portion 118 and the bracket 120 via the bearing 108.

  The drive wheel 36 side of the drive shaft 30 is assembled to the vehicle body via a suspension member (not shown), and the drive wheel 36 is attached to the tip of the drive wheel side shaft member 33.

  Conversely, when removing the motor unit 50 and the drive shaft 30 from the vehicle body, the drive shaft 30 and the motor unit 50 are removed in this order.

  When removing the drive shaft 30 from the vehicle body, first, the drive shaft 30 is connected to only the differential device 10 by removing the bracket 120, the drive wheel 36, and the suspension member, and is attached to the motor unit 50. The state is released.

  In the vehicle-mounted state of the motor unit 50 and the drive shaft 30, the inner diameter of the partition member 100 is the largest outside in the axial direction portion that is located closer to the differential device 10 than the drive wheel 36 side end of the partition member 100 in the drive shaft 30. It is larger than the outer diameter of the enlarged diameter portion 31a having a diameter.

  Therefore, when the drive shaft 30 is removed from the differential 10 and the differential shaft member 31 is extracted from the inside of the partition member 100 while maintaining the on-vehicle state of the motor unit 50, the outer peripheral surface of the differential shaft member 31 is partitioned. Interference with the inner peripheral surface of the member 100 can be avoided.

  Therefore, for example, when maintenance of the drive shaft 30 becomes necessary due to damage to the joint boots 34a and 35a, the maintenance can be performed by removing only the drive shaft 30 while maintaining the in-vehicle state of the motor unit 50. In addition, after the maintenance of the drive shaft 30, the drive shaft 30 is inserted inside the partition member 100 and assembled to the differential device 10 as described above while maintaining the in-vehicle state of the motor unit 50. The assembly of the drive shaft 30 can be completed easily and quickly.

  In this embodiment, since the drive shaft 30 is attached and detached by such a method, when the motor and the drive shaft are assembled as in the prior art, the drive shaft must be attached and detached from the vehicle body together with the motor. In comparison, workability can be effectively improved during maintenance of the drive shaft.

  In addition, as described above, the motor unit 50 is configured to be maintained in an oil-tight state by the oil in the unit case 110 being sealed from the radially inner side by the partition member 100 and the like. The drive shaft 30 can be removed without oil leakage of the motor unit 50 while maintaining the motor unit 50 in the on-vehicle state as described above. Therefore, it is possible to avoid the effort and cost of re-encapsulating oil in the unit case 110 after maintenance of the drive shaft 30. Also in this respect, the maintenance work of the drive shaft 30 can be simplified and speeded up.

  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 example in which the partition member 100 is configured by a cylindrical member having a constant inner diameter over the entire length has been described. However, in the present invention, the inner diameter of the partition member varies depending on the axial position thereof. The specific shape of the partition member can be appropriately changed as long as the drive shaft can be inserted into the cylindrical partition member when the drive shaft is attached to and detached from the vehicle body.

  As described above, according to the present invention, in a vehicle drive device having a motor disposed on a drive shaft, it is possible to improve the workability in the maintenance of the drive shaft. There is a possibility of being suitably used in the field of manufacturing industries of devices and vehicles equipped with the devices.

DESCRIPTION OF SYMBOLS 1 Drive device 2 Engine 3 Transaxle 4 Transaxle case 5 Torque converter 6 Transmission 10 Differential device 12 Differential case (input part of differential device)
18 Side gear (differential output part)
30, 40 Drive shaft (drive shaft)
31, 41 Differential side shaft member 31a Large diameter portion of differential side shaft member 32, 42 Intermediate shaft member 33, 43 Drive wheel side shaft member 50 Motor unit 51 Motor 52 Stator 53 Rotor 54 Output shaft 60 Reducer 60a First planetary gear mechanism 60b Second planetary gear mechanism 61a First sun gear 61b Second sun gear 62 Ring gear member 62a First ring gear 62b Second ring gear 63a First carrier 63b Second carrier 68 Sleeve (output element)
70 Oil pump 100 Partition member 102 O-ring 104 Oil seal (seal member)
110 unit case

Claims (4)

A drive device for a vehicle, comprising: a drive shaft that connects an output portion of a differential device and drive wheels; and a motor that is disposed on the drive shaft so as to be able to transmit power to the input portion of the differential device. There,
A cylindrical partition member that partitions the drive shaft and the motor is disposed outside the drive shaft and inside the motor in the radial direction,
The drive of the vehicle characterized in that the inner diameter of the partition member is larger than the outer diameter of the maximum diameter portion of the axial portion located on the differential device side than the drive wheel side end portion of the partition member in the drive shaft. apparatus. An oil pump is disposed on the drive shaft;
2. The vehicle drive device according to claim 1, wherein an outer surface of the partition member is a guide portion that guides oil discharged from the oil pump to the motor. 3. A case for housing the motor;
A planetary gear mechanism disposed on the drive shaft to decelerate and transmit the output of the motor to the input portion of the differential device,
One end side of the partition member is fixed to an output element of the planetary gear mechanism,
3. The vehicle drive device according to claim 1, wherein the other end side of the partition member is rotatably supported by the case via a seal member. 4. A drive unit set for a vehicle, comprising: a drive shaft that connects an output portion of the differential device and drive wheels; and a motor that is disposed on the drive shaft so that power can be transmitted to the input portion of the differential device. A method of attaching,
Assembling the motor and a cylindrical partition member inserted radially inward of the motor to construct a motor unit having the motor and the partition member,
In a state where the motor unit is assembled to the differential device, one end side of the drive shaft is inserted into the partition member from the anti-differential device side and assembled to the output portion of the differential device. A method for assembling a vehicle drive device.

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