JP2020016258A - Preload application device and vehicle drive device - Google Patents

Abstract

To provide a preload application device which applies a preload to a bearing in a direction orthogonal to a case assembly direction with a simple structure.SOLUTION: A preload application device includes: a rotary shaft having a torque input part into which torque is input; a case which houses the rotary shaft and has a side wall 414 through which the rotary shaft penetrates; a bearing 52 which is disposed in the case and rotatably supports the rotary shaft; and a preload application part which applies a preload to the bearing 52 from the outside of the case. In the side wall 414, a screw hole 416 is opened penetrating in an axial direction around the rotary shaft. The preload application part has a screw member 62 which threadedly engages with the screw hole 416 and presses the bearing 52.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a preload applying device for applying a preload to a bearing and a vehicle drive device.

  2. Description of the Related Art Conventionally, there has been known a device that transmits power of a motor of a vehicle to left and right wheels via a differential case that rotates about a rotation shaft in a left and right direction (for example, see Patent Document 1). In the device described in Patent Document 1, a hollow rotary shaft is rotatably supported via a bearing from a case in which a differential case is housed, and a pair of right and left rod-like members extending through the hollow portion of the rotary shaft. A preload is applied to the bearing using a jig.

JP 2015-132364 A

  However, in the device described in Patent Literature 1, it is necessary to form the rotating shaft in a hollow shape in order to insert the jig into the rotating shaft, and the configuration of the rotating shaft for applying a preload to the bearing becomes complicated. .

  A preload applying device according to one aspect of the present invention includes a rotating shaft having a torque input portion into which torque is input, a case in which the rotating shaft is housed, and a side wall through which the rotating shaft passes, and a case arranged inside the case. A bearing that rotatably supports the rotating shaft; and a preload applying unit that applies a preload to the bearing from outside the case. A screw hole is formed in the side wall so as to penetrate in the axial direction around the rotation shaft, and the preload applying portion has a screw member screwed into the screw hole and pressing the bearing.

  Another aspect of the present invention is a vehicle drive device including the above-described preload applying device, wherein the rotation shaft includes a drive shaft mounted on the vehicle, and a differential mechanism to which the drive shaft is connected, The motor further includes an electric motor that rotates around a motor rotation shaft, and a gear mechanism that transmits torque of the electric motor to a differential mechanism. The differential mechanism, the electric motor, and the gear mechanism are housed in a case.

  According to the present invention, a preload can be applied to a bearing with a simple configuration without using a jig.

FIG. 1 is a front view showing a configuration of a vehicle drive device to which a power transmission device according to an embodiment of the present invention is applied. FIG. 1 is an exploded perspective view illustrating a configuration of a vehicle drive device according to an embodiment of the present invention. FIG. 1 is a side view showing an example in which a vehicle drive device according to an embodiment of the present invention is mounted on a vehicle. FIG. 2 is a plan view of the vehicle drive device according to the embodiment of the present invention in an assembled state. The figure which looked at the housing of FIG. 2 from diagonally downward. FIG. 1 is a cross-sectional view illustrating a configuration of a main part of a preload applying device according to an embodiment of the present invention. FIG. 1 is an exploded perspective view illustrating a main configuration of a preload applying device according to an embodiment of the present invention. FIG. 1 is a perspective view of a vehicle drive device according to an embodiment of the present invention as viewed obliquely from the front left. FIG. 5 is a sectional view taken along the line IX-IX of FIG. 4.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a configuration of a vehicle drive device 100 to which a power transmission device according to an embodiment of the present invention is applied, and FIG. 2 is an exploded perspective view thereof. FIG. 1 mainly shows the configuration of components that transmit power, and illustration of a case and the like is omitted.

  As shown in FIGS. 1 and 2, the vehicle drive device 100 has an electric motor 1 as an example of a rotating electric machine, and transmits a traveling drive torque using the electric motor 1 as a drive source to drive wheels of the vehicle. Therefore, the vehicle drive device 100 is mounted on a vehicle having the electric motor 1 as a traveling drive source, such as an electric vehicle or a hybrid vehicle. In addition, the electric motor 1 can also be used as a generator.

  FIG. 3 is a side view showing an example of mounting the vehicle drive device 100 on a vehicle. Here, an example is shown in which the vehicle drive device 100 is disposed between the left and right front wheels 103 and is used as a front wheel drive device. Note that the vehicle drive device 100 may be disposed between the left and right rear wheels 104 and used as a rear wheel drive device.

  As shown in FIG. 3, the vehicle drive device 100 is disposed near the bottom surface of the vehicle body and at the center in the left-right direction of the vehicle. As a result, the position of the hood of the vehicle can be lowered, and the superiority in design and the like can be increased. Although not shown, the vehicle drive device 100 can be easily arranged below the seat and between the left and right rear wheels 104 without raising the floor surface in the vehicle, that is, without sacrificing the riding space in the vehicle. And the degree of freedom of arrangement of the vehicle drive device 100 is high.

  Hereinafter, the vehicle drive device 100 will be described using the front-rear direction (vehicle length direction), the up-down direction (vehicle height direction), and the left-right direction (vehicle width direction) of the vehicle in a state where the vehicle drive device 100 is mounted on the vehicle. The configuration of each unit will be described.

  As shown in FIG. 1, the vehicle drive device 100 includes an electric motor 1, a rotating body 2 arranged in front of the electric motor 1, and a rotating body 3 arranged further in front of the rotating body 2. That is, the vehicle drive device 100 includes the electric motor 1, the rotating body 2, and the rotating body 3 arranged side by side in the front-rear direction.

  The electric motor 1 has a rotor 11 that rotates around an axis CL1 in the vertical direction, and a stator 12 that is arranged around the rotor 11. The electric motor 1 is, for example, an embedded magnet synchronous motor, and a plurality of permanent magnets in the circumferential direction are embedded in the rotor 11 (rotor core). Note that a synchronous reluctance motor or a switched reluctance motor having no magnet can be used as the electric motor 1.

  The stator 12 has a substantially cylindrical stator core centered on the axis CL1 and arranged from the outer peripheral surface of the rotor 11 (rotor core) via a gap having a predetermined length in the radial direction. The stator core is a stator core, and a plurality of slots in the circumferential direction are provided on the inner circumferential surface toward the outside in the radial direction. Windings (coils) are arranged in each slot by concentrated winding or distributed winding. When a three-phase alternating current flows through the winding, a rotating magnetic field is generated, and the rotor 11 rotates.

  A first rotating shaft 13 is arranged inside the rotor 11 of the electric motor 1 along the axis CL1. The first rotating shaft 13 is coupled to the rotor 11 by, for example, spline coupling, and rotates integrally with the rotor 11. The upper end of the first rotating shaft 13 protrudes from the upper end surface of the rotor 11, and a first gear 14 having a smaller diameter than the rotor 11 is provided at the upper end. The first gear 14 is coupled to the first rotating shaft 13 by, for example, spline coupling, and rotates integrally with the first rotating shaft 13. Note that the first gear 14 may be formed on the outer peripheral surface of the first rotating shaft 13. The first gear 14 is composed of, for example, a spur gear.

  The rotating body 2 has a second rotating shaft 21 extending around the vertical axis CL2. A second gear 22 is provided at an upper end of the second rotating shaft 21. The second gear 22 is connected to the second rotating shaft 21 by, for example, a spline connection, and rotates integrally with the second rotating shaft 21. Note that the second gear 22 can be formed on the outer peripheral surface of the second rotating shaft 21.

  The second gear 22 is formed of, for example, a spur gear, similarly to the first gear 14, and the first gear 14 and the second gear 22 mesh with each other. The diameter of the second gear 22 is larger than the diameter of the first gear 14, and the first gear 14 and the second gear 22 mesh with each other above the rotor 11 (inner side than the inner peripheral surface of the stator 12). By configuring the second gear 22 to have a larger diameter than the first gear 14, the reduction ratio is increased, and the transmission torque from the first rotating shaft 13 to the rotating body 2 can be increased.

  A worm 23 constituting a worm gear is provided on the second rotating shaft 21 below the second gear 22 and beside the electric motor 1. The worm 23 is a screw-shaped gear in which teeth are continuously formed in a spiral shape. The worm 23 is coupled to the second rotation shaft 21 by, for example, a spline connection, and rotates integrally with the second rotation shaft 21. The worm 23 can be formed on the outer peripheral surface of the second rotating shaft 21.

  The worm 23 meshes with a worm wheel (helical gear) 32 that is rotatable about a left-right axis CL3. The worm wheel 32 is disposed below the second gear 22. The worm wheel 32 constitutes the rotating body 3 together with the third rotating shaft 31 extending along the axis CL3. The rotating body 3 constitutes a differential mechanism, and the power input via the worm wheel 32 is transmitted to the front wheels 103 via the third rotating shaft 31, whereby the vehicle runs. The third rotating shaft 31 is located at substantially the same height as the vertical center of the electric motor 1.

  As shown in FIG. 2, the vehicle drive device 100 includes a housing 41, an upper case 42 fastened to the upper surface of the housing 41 by bolts 42a, and a lower case 43 fastened to the lower surface of the housing 41 by bolts 43a. . The housing 4, the upper case 42, and the lower case 43 constitute a case 4 as a whole. A housing space SP is formed inside the case 4, and the motor 1, the rotating body 2, and the rotating body 3 are housed in the housing space SP. In this housed state, the first rotating shaft 13 is rotatably supported by the case 4 via a pair of upper and lower bearings 44 and 45, and the second rotating shaft 21 is supported by the case 4 via a pair of upper and lower bearings 46 and 47. It is supported rotatably. That is, the vehicle driving device 100 is configured as a vehicle driving unit in which driving components are accommodated in the case 4.

  FIG. 4 is a plan view of the vehicle drive device 100 in an assembled state. As shown in FIGS. 2 and 4, the housing 41 has a first housing part 411 configured in a frame shape, and a second housing part 412 swelling forward from the first housing part 411. An opening 411a is provided on the upper surface of the first housing part 411. After the electric motor 1 and the rotating body 2 are inserted through the opening 411a, the upper case 42 is attached so as to close the opening 411a.

  FIG. 5 is a view of the housing 41 as viewed from obliquely below. As shown in FIGS. 2 and 5, an opening 412a is provided on the lower surface of the second housing portion 412, and after the rotating body 3 (differential mechanism) is inserted through the opening 412a, the opening 412a is closed. So that the lower case 43 is attached. Although not shown in FIG. 2, the third rotating shaft 31 is rotatably supported from the second housing portion 412 via a bearing.

  As described above, the vehicle drive device 100 is configured such that the upper case 42 and the lower case 43 are fastened to the housing 41 in the vertical direction, but the third rotating shaft 31 extends not in the vertical direction but in the front-rear direction. . For this reason, it is difficult to apply a preload to the bearing of the third rotating shaft 31 using the fastening force when the case is fastened. Therefore, in the present embodiment, the preload applying device is configured as follows so that the preload can be easily and appropriately applied to the bearing of the third rotating shaft 31.

  FIG. 6 is a cross-sectional view (a cross-sectional view taken along the line VI-VI in FIG. 4) showing a main configuration of the preload applying device 200, and FIG. 7 is an exploded perspective view thereof. In FIG. 7, illustration of the case 4 (the second housing 412, the upper case 42, and the lower case 43) is omitted.

  As shown in FIG. 6, the worm wheel 32 is fastened to the outer peripheral surface of a hollow differential case 33 constituting the differential mechanism DM by a bolt 32a. At both left and right ends of the differential case 33, cylindrical portions 33a centered on the axis CL3 are formed. Bearings 51 and 52 (for example, tapered roller bearings) are fitted on the outer peripheral surfaces of the left and right cylindrical portions 33a, respectively, and the differential case 33 is rotatably supported from the case 4 via the bearings 51 and 52. Thus, the worm wheel 32 and the differential case 33 rotate integrally about the axis CL3. Through holes 413 are respectively opened in left and right side walls 414 of the second housing portion 412, and a pair of left and right drive shafts 34 are inserted through the through holes 413.

  Although not shown, the differential mechanism DM includes a pair of left and right side gears and a pair of pinion gears meshed with the respective side gears, which are disposed inside the differential case 33, respectively. The pair of left and right side gears are respectively coupled to distal ends of a pair of left and right drive shafts 34 penetrating the inside of the cylindrical portion 33a, and rotate about the axis CL3 integrally with the drive shaft 34. The pair of pinion gears are rotatably supported by a pinion shaft fixed to the differential case 33 and extending perpendicular to the axis CL3, and the left and right drive shafts are rotated by the pinion gears rotating around the pinion shaft when the vehicle turns. A speed difference can be created in the rotation of 34. Note that an oil seal 415 is interposed between the inner peripheral surface of the through hole 413 of the left and right side walls 414 of the second housing 412 and the outer peripheral surface of the drive shaft 34, respectively.

  In the above configuration, the left and right cylindrical portions 33a of the differential case 33 and the pair of left and right drive shafts 34 rotate about the axis CL3, and constitute the third rotation shaft 31 of FIG. 1 as a whole. Therefore, the third rotating shaft 31 is rotatably supported by the second housing 412 via the pair of left and right bearings 51 and 52, and extends in the left and right direction through the side wall 414 of the second housing 412.

  As shown in FIGS. 6 and 7, on the left and right sides of each of the bearings 51 and 52, substantially ring-shaped plates 53 and 54 centering on the axis CL3 are arranged. The substantially cylindrical pressing blocks 55 and 56 centering on CL3 are arranged. The pair of plates 53 and 54 have the same shape and are arranged in opposite directions to each other. The pair of pressing blocks 55 and 56 have the same shape and are arranged in left and right opposite directions.

  The plates 53 and 54 are provided facing the bearings 51 and 52 so that oil flows into the bearings 51 and 52. The pressing blocks 55 and 56 include cylindrical portions 55b and 56b having cylindrical inner circumferential surfaces 55a and 56a around the axis CL3, and inner circumferential surfaces 55a and 56a from the left and right outer ends of the cylindrical portions 55b and 56b. And projecting portions 55c, 56c projecting radially inward and over the entire circumference. The diameter of the inner peripheral surfaces 55a and 56a is substantially equal to the diameter of the outer peripheral surfaces of the outer rings 51a and 52a of the bearings 51 and 52, and the outer rings 51a and 52a are fitted to the inner peripheral surfaces 55a and 56a.

  When the outer rings 51a, 52a are fitted, the plates 53, 54 are interposed between the protrusions 55c, 56c and the outer rings 51a, 52a. The inner diameters of the protrusions 55c, 56c are substantially equal to or larger than the inner diameters of the outer rings 51a, 52a of the bearings 51, 52. Therefore, when a pressing force acts on the pressing blocks 55 and 56 from the outside in the axial direction (left and right), the outer rings 51a and 52a are pressed inward in the axial direction via the protruding portions 55c and 56c and the plates 53 and 54.

  The outer peripheral surfaces of the pressing blocks 55 and 56 have a substantially rectangular shape as a whole in a plane perpendicular to the axis CL3, and chamfered portions 55d and 56d are formed at upper and lower corners in the front-rear direction. As shown in FIG. 5, a pair of front and rear recesses 412b corresponding to the pressing blocks 55 and 56 are provided on the lower surface of the housing 41. After the pair of front and rear bearings 51, 52, plates 53, 54, and pressing blocks 55, 56 are temporarily assembled in the differential case 33 (FIG. 7), these are inserted into the second housing 412 from below as shown in FIG. Is inserted into.

  At this time, when the pressing blocks 55 and 56 are fitted into the recesses 412b of the second housing 412, the pressing blocks 55 and 56 are positioned with respect to the second housing 412, whereby the differential case 33 inside the pressing blocks 55 and 56 is formed. Etc. are also positioned. Thereafter, the lower case 43 is attached to the second housing 412, and the assembly of the vehicle drive device 100 (vehicle drive unit) is completed.

  FIG. 8 is a perspective view of the side wall 414 of the housing 41 after assembling the vehicle drive device 100 as viewed obliquely from the left front. As shown in FIGS. 5 and 8, a plurality of screw holes 416 are formed in the side wall 414 of the housing 41 around the through hole 413 so as to pass through the side wall 414. Bolts 62 are screwed into these screw holes 416 via spring washers 61, respectively. The screw holes 416 are arranged facing the side end surfaces of the protrusions 55c, 56c of the pressing blocks 55, 56.

  FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 4 and shows a state in which a preload is applied to the right bearing 52. Although not shown, a preload is similarly applied to the left bearing 51. As shown in FIG. 9, when the bolt 62 is screwed into the screw hole 416 of the side wall 414, the tip of the bolt 62 comes into contact with the side end surface of the pressing block 56, and the pressing block 56 moves inward in the left-right direction (the direction of the arrow). Pressed. As a result, a pressing force acts on the outer ring 52a of the bearing 52 via the plate 54 from the protrusion 56c, and a preload is applied to the bearing 52.

  At this time, since the spring washer 61 is interposed between the bearing surface 62a of the bolt 62 and the end surface of the side wall 414, the spring washer 61 shrinks in the left-right direction and a reaction force acts on the bolt 62. The magnitude of the preload can be adjusted according to this reaction force. That is, by adjusting the screwing amount of the bolt 62, the magnitude of the preload can be set. The bolt 62, the spring washer 61, and the pressing blocks 55, 56 are used for applying a preload to the bearings 51, 52, and these constitute a preload applying unit 60.

  As described above, in the present embodiment, the pressing blocks 55 and 56 are arranged between the bearings 51 and 52 that rotatably support the third rotation shaft 31 (the cylindrical portion 33 a and the drive shaft 34) and the side wall 414 of the housing 41. A pressing force is applied to the pressing blocks 55 and 56 from outside the side wall 414 by bolts 62 penetrating the side wall 414. Thus, after assembling the vehicle drive device 100, preload can be easily applied to the bearings 51 and 52.

According to the present embodiment, the following effects can be obtained.
(1) The preload applying device 200 includes a third rotating shaft 31 integrally having a worm wheel 32 to which a torque is input, and a side wall 414 in which the third rotating shaft 31 is housed and the third rotating shaft 31 penetrates. Case 4, in particular, a housing 41, bearings 51, 52 disposed inside the housing 41 and rotatably supporting the third rotating shaft 31, and a preload for applying a preload to the bearings 51, 52 from outside the housing 41. And an application unit 60 (FIGS. 1, 6, 7, and 9). A screw hole 416 is formed in the side wall 414 around the third rotating shaft 31 so as to penetrate in the axial direction (FIGS. 5, 8, and 9). The preload applying section 60 has a bolt that is screwed into the screw hole 416 and presses the bearings 51 and 52 (FIGS. 8 and 9). With this configuration, the preload can be applied to the bearings 51 and 52 with a simple configuration without using a jig.

(2) The preload applying section 60 further includes pressing blocks 55 and 56 which are interposed between the side wall 414 and the bearings 51 and 52 and have a substantially ring shape corresponding to the bearings 51 and 52 (FIGS. 6 and 7). . Thus, the side surfaces of the outer rings 51a, 52a of the bearings 51, 52 can be uniformly pressed in the circumferential direction, and the preload can be appropriately applied to the bearings 51, 52. Further, since the pressing force by the screwing of the bolt 62 acts on the bearings 51 and 52 via the pressing blocks 55 and 56, the position of the screw hole 416 is shifted radially from the axial extension of the position of the outer rings 51a and 52a. It can be set, and the degree of freedom of the position of the screw hole 416 is high.

(3) The preload applying section 60 further has a spring washer 61 interposed between the side wall 414 and the bearing surface 62a of the bolt 62 outside the housing 41 (FIGS. 8 and 9). Thereby, the reaction force acting on the bolt 62 can be adjusted, and the magnitude of the preload can be adjusted.

(4) The case 4 has a housing 41 and a lower case 43 which are fastened to each other in a vertical direction orthogonal to the horizontal direction in which the third rotation shaft 31 extends, and the side wall 414 is provided integrally with the housing 41. (FIGS. 2 and 5). When using the case 4 that is fastened in the vertical direction, a preload is applied to the bearings 51 and 52 of the third rotating shaft 31 extending in the left / right direction using the fastening force (the preload is applied in the left / right direction). Is difficult to provide. For this reason, the effect of applying the preloading device 200 of the present embodiment is great.

(5) The third rotation shaft 31 includes a drive shaft 34 mounted on the vehicle (FIG. 6). The vehicle drive device 100 includes a differential mechanism DM to which the drive shaft 34 is connected, the electric motor 1 rotating around the first rotation shaft 13 in the vertical direction, and a first mechanism for transmitting the torque of the electric motor 1 to the differential mechanism DM. It further includes a gear 14, a second gear 22, a worm 23, a worm wheel 32, and the like (FIG. 1). The differential mechanism DM, the electric motor 1, the first gear 14, the second gear 22, the worm 23, the worm wheel 32 and the like are housed in the case 4 (FIG. 2). This makes it possible to unitize and configure the vehicle driving device 100 so that high output can be exhibited while suppressing the height of the entire device, and the vehicle driving device can be easily installed in a limited space in the height direction of the vehicle. Can be arranged.

  In the above embodiment, the torque is input to the third rotating shaft 31 via the worm wheel 32 as a torque input unit, and the bearings 51 and 52 rotatably support the third rotating shaft 31 in the case 4. , But the configuration of the rotating shaft is not limited to this. That is, the rotating shaft is not limited to the cylindrical portion 33a of the differential case 33 that rotates about the axis CL3 and the drive shaft 34, but may be a rotating shaft other than the differential mechanism. The bearing to which the preload is applied may be other than the tapered roller bearing.

  In the above embodiment, the preload is applied to the bearing using the bolt, the spring washer, and the pressing bracket. That is, the preload applying section 60 is configured. However, the preload applying section may have any configuration as long as it has a screw member that is screwed into the screw hole in the side wall. The screw member is not limited to the bolt 62, and various screws can be used. In the above embodiment, the substantially ring-shaped pressing blocks 55 and 56 corresponding to the bearings 51 and 52 are arranged between the side wall 414 and the bearings 51 and 52, but the configuration of the intermediate member is not limited to the above.

  In the above embodiment, the third rotating shaft 31 is housed in the housing 41 having the side wall 414 through which the third rotating shaft 31 (drive shaft 34) penetrates. However, the configuration of the case is not limited to the above. In the above embodiment, the housing 41 as the first case portion and the lower case as the second case portion are arranged in a vertical direction (second direction) orthogonal to the left-right direction (first direction) in which the third rotation axis extends. 43, but the configuration of the first case portion and the second case portion is not limited to this.

  In the above-described embodiment, the electric motor 1 that rotates around the first rotating shaft 13 (motor rotating shaft), the differential mechanism DM to which the drive shaft 34 is connected, and the second mechanism that transmits the torque of the electric motor 1 to the differential mechanism DM. The example in which the preload applying device 200 is applied to the vehicle drive device 100 including the gear mechanism such as the first gear 14, the second gear 22, the worm 23, and the worm wheel 32 has been described. However, the preload applying device of the present invention can be similarly applied to various vehicle driving devices such as a vehicle driving device having a prime mover.

  The above description is merely an example, and the present invention is not limited by the above-described embodiments and modifications as long as the features of the present invention are not impaired. It is also possible to arbitrarily combine one or more of the above-described embodiment and the modifications, and it is also possible to combine the modifications.

Reference Signs List 1 motor, 4 cases, 14 first gear, 22 second gear, 23 worm, 31 third rotating shaft, 32 worm wheel, 41 housing, 43 lower case, 51, 52 bearing, 55, 56 pressing block, 60 preload application Part, 61 spring washer, 62 bolt, 100 vehicle drive device, 200 preload applying device, 414 side wall, 416 screw hole, DM differential mechanism

Claims (5)

A rotating shaft having a torque input unit into which torque is input,
A case in which the rotating shaft is housed and which has a side wall through which the rotating shaft passes;
A bearing that is disposed inside the case and rotatably supports the rotating shaft;
A preload applying unit that applies a preload to the bearing from outside the case,
On the side wall, around the rotation axis, a screw hole is drilled through in the axial direction,
The said preload provision part has a screw member screwed in the said screw hole and pressing the said bearing, The preload provision apparatus characterized by the above-mentioned. The preload applying device according to claim 1,
The preload applying device further comprises an intermediate member interposed between the side wall and the bearing, and having a substantially ring shape corresponding to the bearing. The preload applying device according to claim 1 or 2,
The preload applying device, wherein the preload applying unit further includes a spring washer interposed between the side wall and a seating surface of the screw member outside the case. The preload applying device according to any one of claims 1 to 3,
The case has a first case portion and a second case portion fastened to each other in a second direction orthogonal to a first direction in which the rotation axis extends,
The said side wall is provided integrally with the said 1st case part, The preload provision apparatus characterized by the above-mentioned. A vehicle drive device comprising the preload applying device according to any one of claims 1 to 4,
The rotation shaft includes a drive shaft mounted on a vehicle,
A differential mechanism to which the drive shaft is connected;
An electric motor that rotates about a vertical motor rotation axis,
A gear mechanism for transmitting the torque of the electric motor to the differential mechanism,
The vehicle drive device, wherein the differential mechanism, the electric motor, and the gear mechanism are housed in the case.

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