JP4967789B2 - Wheel drive device - Google Patents

Description

  The present invention relates to a vehicle drive device, and more particularly to a wheel drive device having an in-wheel motor.

  In recent years, vehicles such as electric vehicles, hybrid vehicles, and fuel cell vehicles that employ an AC motor as a driving source for vehicle propulsion and are equipped with a motor driving device that drives the AC motor have appeared. In such automobiles, it has been studied to install so-called in-wheel motors in which drive motors are provided on left and right drive wheels or left and right and front and rear drive wheels, respectively.

  As a wheel drive device having a conventional in-wheel motor, there is one described in Patent Document 1 below.

  In the electric vehicle drive unit described in Patent Document 1, a case is suspended from a vehicle body via a suspension device, and an output shaft is rotatably supported by the case via a wheel bearing. Two planetary units as speed reducers are arranged, and a motor is arranged on the outer peripheral side of the planetary unit.

JP 2001-032888 A

  By the way, in the wheel drive device having an in-wheel motor, the motor is downsized by setting the characteristics of the motor to high rotation and low torque and the high reduction ratio of the reduction gear. However, when sudden braking is applied when the motor torque is generated, that is, when the occupant depresses the brake pedal while depressing the accelerator pedal, a large torsional resonance torque acts on the output shaft connected to the wheel. Therefore, it is necessary to increase the diameter of the output shaft to ensure a predetermined torsional strength. For example, when a reduction gear is disposed on the outer peripheral side of the output shaft, the outer diameter of the reduction gear is increased.

  On the other hand, in the vehicle suspension device, the upper end of the knuckle arm is connected to the upper arm via the ball joint, while the lower end of the knuckle arm is connected to the lower arm via the ball joint, and the suspension is between the vehicle body and the lower arm. Is provided. In this case, the kingpin center line connecting the strut (suspension) apex and the lower ball joint is set, and the angle and position formed by the kingpin center line with respect to the vertical line have a great influence on the steering performance and steering stability of the vehicle.

  That is, since the outer diameters of the output shaft and the speed reducer are increased, it is difficult to secure a sufficient space for disposing the connecting portion (lower ball joint) between the knuckle arm and the lower arm. In the above-described conventional in-wheel motor, a lower ball joint is disposed on the vehicle inner side of the motor, and a suspension is connected to the lower ball joint. In other words, since the speed reducer is arranged on the outer peripheral side of the output shaft and the motor is arranged on the outer peripheral side thereof, the lower ball joint has to be arranged on the vehicle inner side from this motor, and the kingpin center line Is difficult to set to an optimal angle and position.

  The present invention is for solving such a problem, and it is possible to set the connecting portion between the lower arm and the wheel support member at an optimum position and to prevent interference between the connecting portion and the speed reducer. An object of the present invention is to provide a wheel drive device that can perform the above.

  In order to solve the above-described problems and achieve the object, the wheel drive device of the present invention drives a wheel by decelerating the rotational force of a motor disposed in the wheel by a speed reducer and transmitting it to the wheel. In the wheel drive device, the motor and the speed reducer are accommodated in a housing, and a connecting portion between a lower arm and a wheel support member is disposed to face the radial direction of the speed reducer and the wheel. The outer peripheral part of the ring gear which comprises a reduction gear is connected by a spline, and a missing tooth part is formed in the position facing the said connection part in the circumferential direction of the said spline.

  In the wheel drive device of the present invention, the missing tooth portion is provided at a lower portion in the circumferential direction of the spline over a predetermined range, and the inner peripheral surface forming the arc shape of the housing and the outer peripheral surface forming the arc shape of the ring gear are fitted. It is characterized by being formed together.

  In the wheel drive device of the present invention, the speed reducer includes a first speed reducer and a second speed reducer, and the first speed reducer and the second speed reducer are located on the vehicle inward side with respect to the motor. An outer peripheral portion of a ring gear that is arranged and constitutes at least one of the first reduction device and the second reduction device is connected to the housing by a spline, and the connection portion in the circumferential direction of the spline It is characterized in that a missing tooth portion is formed at a position opposite to.

  In the wheel drive device of the present invention, the speed reducer is configured by a planetary gear mechanism having a sun gear, a plurality of planetary gears, a planetary carrier, and the ring gear.

  In the wheel drive device of the present invention, the motor and the speed reducer are disposed on the same axis.

  According to the wheel drive device of the present invention, the rotational force of the motor disposed in the wheel is decelerated by the speed reducer and transmitted to the wheel so that the wheel can be driven, and the motor and the speed reducer are placed in the housing. The lower arm and the wheel support member are connected to each other in the radial direction of the reducer and the wheel, and the outer periphery of the ring gear constituting the housing and the reducer is connected by a spline. Since the missing tooth portion is formed at a position facing the connecting portion in the direction, a sufficient space around this is ensured by this missing tooth portion, and the connecting portion between the lower arm and the wheel support member can be set at the optimum position. At the same time, interference between the connecting portion and the reduction gear can be prevented.

  Embodiments of a wheel drive device according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a longitudinal sectional view showing a wheel drive device according to one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG. 1 showing a first speed reducer in the wheel drive device of this embodiment.

  In the wheel drive device of the present embodiment, as shown in FIGS. 1 and 2, the wheel 11 is configured by mounting a tire (not shown) on the outer periphery of the wheel 12. The wheel 11 (wheel 12) is supported on the vehicle by a double wishbone suspension that is a suspension device.

  The wheel 12 has a cylindrical shape and is integrally formed with an annular flange portion 12a located on the vehicle outer side (left side in FIG. 1). A stepped through hole 12b is formed at the center of the flange portion 12a. Is formed. A support ring 13 is fitted into the through hole 12 b of the wheel 12. The inner ring side member 14 has a cylindrical shape, and an end portion on the outer side of the vehicle is fitted inside the support ring 13, and a flange portion 14 a having a disk shape is in close contact with the flange portion 12 a of the wheel 12. The hub bolt 15 passes through the flange portion 12a of the wheel 12 from the vehicle outer side, and the screw portion at the tip is screwed into the flange portion 14a of the inner ring side member 14, so that the wheel 12 and the inner ring side member 14 are fixed integrally. Has been. In addition, the brake disk 16 has a mounting portion 16 a that is in close contact with the flange portion 14 a of the inner ring side member 14, a plurality of mounting bolts 17 that penetrate the mounting portion 16 a, and a screw portion at the tip that is the flange portion 14 a of the inner ring side member 14. The brake disc 16 is integrally fixed to the inner ring side member 14. A brake caliper 18 is disposed on the outer periphery of the brake disc 16.

  The output shaft 19 is fitted to the inside of the support ring 13 through the locking ring 20 at the end on the vehicle outer side. The output shaft 19 is fitted to the inner ring side member 14 through the spline 21 so as not to be relatively rotatable. In this case, the spline 21 is configured by external teeth formed on the outer peripheral portion of the output shaft 19 and internal teeth formed on the inner peripheral portion of the inner ring side member 14. The outer ring side member 22 has a cylindrical shape, is located on the outer peripheral side of the inner ring side member 14, and is fitted to the inner ring side member 14 via a hub bearing 23 so as to be relatively rotatable. In this case, the outer race that constitutes the hub bearing 23 is constituted by a part of the outer ring side member 22, while the inner race that constitutes the hub bearing 23 is constituted by a part of the inner ring side member 14. A plurality of balls 23 a are supported between the side member 14 and the outer ring side member 22. Bearing seals 24 and 25 are provided on the outer sides of the balls 23a in the inner ring side member 14 and the outer ring side member 22, and external leakage of grease filled in the hub bearing 23 is prevented.

  On the other hand, the housing 26 includes a housing body 27 and a cover 28, and is integrally fixed to the knuckle arm 29. That is, the outer ring side member 22 is integrally formed with a flange portion 22a having a disk shape, and one end portion of the housing body 27 having a cylindrical shape is fixed to the flange portion 22a by the bolt 30. A cover 28 is fixed to the other end of the housing body 27 with a bolt (not shown).

  In the housing 26, a motor 31 and a plurality of (two in this embodiment) first reduction gear 32 and second reduction gear 33 are accommodated. In this embodiment, the motor 31 and the speed reducers 32 and 33 are disposed on the same axis, that is, on the central axis O of the output shaft 19, and the first speed reducer 32 and the second speed reducer 33. Is arranged on the vehicle inner side with respect to the motor 31.

  In the motor 31, a rotating body 34 having a cylindrical shape is fitted to the outer peripheral portion of the output shaft 19 so as not to move in the axial direction and to be relatively rotatable in the circumferential direction. The rotating portion 34a formed on the outer ring side member 22 is extended to the outer peripheral side, and the rotor 35 is integrally formed on the outer peripheral portion of the rotating portion 34a. On the other hand, a stator core 36, which is opposed to the outer peripheral side of the rotor 35 and wound with a stator coil with a predetermined gap, is fixed to the housing 26 in a ring shape. That is, the inner ring side member 14 and the output shaft 19 constituting the axle are rotatably supported on the inner circumferential side of the outer ring side member 22 as a wheel support member via the hub bearing 23, while the outer circumference of the outer ring side member 22 is supported. A motor 31 is disposed on the side.

  The first and second reduction gears 32 and 33 are reduction gears each including a planetary gear mechanism. The first speed reducer 32 is disposed adjacent to the motor 31 and closer to the vehicle inner side than the motor 31. The first speed reducer 32 includes a sun gear 37, a plurality of planetary gears 38, a pair of planetary carriers 39 and 40, and a ring gear 41.

  The sun gear 37 is integrally formed on the outer peripheral portion of the rotating body 34. A plurality (four in this embodiment) of planetary gears 38 are supported by the support shaft 42 through a roller bearing 43 so as to be relatively rotatable, and are arranged on the outer periphery of the sun gear 37 at equal intervals in the circumferential direction. It meshes with the sun gear 37. The support shaft 42 is supported by the planetary carriers 39 and 40 at the end portions of the shafts, and the plurality of planetary gears 38 are maintained in the circumferential direction together with the planetary carriers 39 and 40. Revolving around the sun gear 37 is possible. Each planetary carrier 39, 40 is connected by a connecting portion 44. The ring gear 41 is integrally connected to the housing 26 through a spline 45. In this case, the spline 45 includes an external tooth 41 a formed integrally with the ring gear 41 and an internal tooth 27 a formed integrally with the inner peripheral surface of the housing body 27. A plurality of planetary gears 38 mesh with the ring gear 41.

  On the other hand, the second speed reducer 33 is disposed adjacent to the first speed reducer 32 and closer to the vehicle inner side than the motor 31 and the first speed reducer 32. The second speed reducer 33 includes a sun gear 46, a plurality of planetary gears 47, a pair of planetary carriers 48 and 49, and a ring gear 50.

  The planetary carrier 40 in the first reduction gear 32 described above is integrally formed with a cylindrical portion 40a that can rotate relative to the outer peripheral portion of the output shaft 19, and the sun gear 46 is integrated with the outer peripheral portion of the cylindrical portion 40a. Is formed. A plurality (four in the present embodiment) of planetary gears 47 are supported by the support shaft 51 via a roller bearing 52 so as to be relatively rotatable, and are arranged on the outer periphery of the sun gear 46 at equal intervals in the circumferential direction. It meshes with the sun gear 46. The support shaft 51 is supported by the planetary carriers 48 and 49 at the end portions of the shafts, so that the plurality of planetary gears 47 are maintained in the circumferential direction together with the planetary carriers 48 and 49. Revolving around the sun gear 46 is possible. The planetary carriers 48 and 49 are connected by a connecting portion 53. The ring gear 50 is integrally connected to the housing 26 through a spline 54. In this case, the spline 54 includes an external tooth 50 a formed integrally with the ring gear 41 and an internal tooth 27 b formed integrally with the inner peripheral surface of the housing body 27. A plurality of planetary gears 47 mesh with the ring gear 50.

  The planetary carrier 49 in the second speed reducer 33 is integrally formed with a cylindrical portion 49 a with respect to the outer peripheral portion of the output shaft 19. The cylindrical portion 49 a has an outer peripheral portion on the cover 28 via a bearing 55. While being rotatably supported, the inner peripheral portion is fitted to the output shaft 19 via the spline 56 so as to be integrally rotatable. A shaft cover 57 that covers the shaft end of the output shaft 19 is fixed to the cover 28.

  As a suspension device for the wheel 11 (wheel 12), the knuckle arm 29 is connected to an upper arm (not shown) whose upper end is supported on the vehicle body side via a ball joint. The knuckle arm 29 has a bifurcated lower end, and a front lower end 29a is connected to an end 61a of the lower arm 61 extending from the vehicle inner side via a lower ball joint 62, and A lower end portion is connected to an end portion of a tie rod (not shown) extending from the vehicle inner side through a ball joint. Further, a shock absorber and a coil spring (not shown) are interposed between the vehicle body side and the lower arm 61.

  In this case, in the present embodiment, the lower ball joint 62 that connects the lower arm 61 and the knuckle arm 29, and the first reduction gear that has a relatively small diameter among the reduction gears 32 and 33, in fact, the smallest diameter. The machine 32 is disposed to face the radial direction of the wheel 12. Here, the wheel support member of the present invention includes the knuckle arm 29, the housing 26, the outer ring side member 22 as the wheel support member, and the like, and the connecting portion between the lower arm 61 and the wheel support member, that is, the knuckle arm 29, The lower ball joint 62 is used. The speed reducer according to the present invention includes the first speed reducer 32 and the first speed reducer 33. By making the speed reduction ratio of the first speed reducer 32 smaller than the speed reduction ratio of the second speed reducer 33, The outer diameter of the first reduction gear 32 is set smaller than the outer diameter of the second reduction gear 33.

  Therefore, by making the outer diameter of the first reduction gear 32 arranged between the motor 31 and the second reduction gear 33 smaller than the outer diameter of the second reduction gear 33, the first reduction gear 32 is placed below the first reduction gear 32. A large space can be secured, and a lower ball joint 62 for connecting the lower arm 61 and the knuckle arm 29 can be disposed in this space.

  In the present embodiment, as described above, the motor 31 and the first and second reduction gears 32 and 33 are accommodated in the housing 26, and the connection between the lower arm 61 and the knuckle arm 29 constituting the wheel support member is performed. A lower ball joint 62 as a portion is disposed opposite to the first reduction gear 32 and the second reduction gear 33 in the radial direction of the wheel 12. The housing body 27 of the housing 26 and the outer peripheral portions of the ring gears 41 and 50 constituting the reduction gears 32 and 33 are connected by splines 45 and 54, and the lower ball joint 62 in the circumferential direction of the splines 45 and 54 is connected. The tooth missing portions 27c, 27d, 41b, and 50b are formed at positions facing the.

  That is, in the first speed reducer 32, the housing main body 27 of the housing 26 is integrally formed with the inner teeth 27a along the circumferential direction on the inner circumferential surface, while the ring gear 41 extends along the circumferential direction on the outer circumferential surface. The outer teeth 41a are integrally formed. In addition, the housing body 27 is integrally formed with a missing tooth portion 27c continuously from the inner teeth 27a along the circumferential direction on the inner circumferential surface, while the ring gear 41 has external teeth along the circumferential direction along the outer circumferential surface. A missing tooth portion 41b is formed integrally with 41a. Then, the outer teeth 41 a of the ring gear 41 are fitted to the inner teeth 27 a of the housing body 27, and the missing tooth portion 41 b of the ring gear 41 is fitted to the missing tooth portion 27 c of the housing body 27. ing.

  In this case, each of the missing tooth portions 27 c and 41 b is provided at a lower portion in the circumferential direction of the spline 45 over a predetermined angle range θ, and forms an arc shape of the ring gear 41 with an inner peripheral surface forming an arc shape of the housing body 27. The outer peripheral surface is formed by fitting. Therefore, the housing main body 27 and the ring gear 41 do not need to form the inner teeth 27a and the outer teeth 41a at the respective missing tooth portions 27c and 41b, and therefore the thickness can be reduced. 27, a notch 71 is formed at the lower part of the outer peripheral part, and the downward projecting amount is reduced.

  In the first reduction gear 32, the housing main body 27 of the housing 26 is integrally formed with the inner teeth 27b along the circumferential direction on the inner peripheral surface, while the ring gear 50 extends along the circumferential direction on the outer peripheral surface. The outer teeth 50a are integrally formed. In addition, the housing body 27 is formed integrally with the internal teeth 27b along the circumferential direction on the inner circumferential surface, and the ring gear 50 is formed integrally with the outer teeth along the circumferential direction. The missing tooth portion 50b is integrally formed continuously with 50a. The outer teeth 50a of the ring gear 50 are fitted to the inner teeth 27b of the housing body 27, and the missing teeth 50b of the ring gear 50 are fitted to the missing teeth 27d of the housing body 27. ing.

  In this case, each of the missing tooth portions 27d and 50b is provided at a lower portion in the circumferential direction of the spline 54 over a predetermined angle range θ, and forms an arc shape of the ring gear 50 with an inner peripheral surface forming an arc shape of the housing body 27. The outer peripheral surface is formed by fitting. Therefore, the housing main body 27 and the ring gear 50 do not need to form the inner teeth 27b and the outer teeth 50a at the respective missing tooth portions 27d and 50b, so that the thickness can be reduced. 27, the notch 72 is formed at the lower part of the outer peripheral part, and the amount of protrusion downward is reduced.

  Therefore, the outer periphery of the housing 26 (housing main body 27) and the ring gears 41 and 50 of the speed reducers 32 and 33 are connected by the splines 45 and 54, and opposed to the lower ball joint 62 in the circumferential direction of the splines 45 and 54. By forming the missing tooth portions 27c, 27d, 41b, and 50b at the positions to be moved, the downward protrusion amount in the housing 26 is reduced, and a large space portion is secured below the first and second speed reducers 32 and 33. In this space, a lower ball joint 62 that connects the lower arm 61 and the knuckle arm 29 can be provided.

  Here, the operation of the wheel drive device of the present embodiment configured as described above will be described.

  When the motor 31 is energized in the wheel drive device of this embodiment, the rotating body 34 rotates together with the rotor 35 with respect to the stator core 36, the sun gear 37 formed on the rotating body 34 rotates, and a plurality of planetary gears 38. Is rotated while being engaged with the sun gear 37 and the ring gear 41, and the planetary carrier 40 that supports the plurality of planetary gears 38 is rotated. Subsequently, when the planetary carrier 39 is rotated, the sun gear 46 formed on the planetary carrier 39 is rotated, and the plurality of planetary gears 47 revolve while rotating while being engaged with the sun gear 46 and the ring gear 50. When the planetary carrier 49 that supports 47 rotates, the second reduction gear 33 realizes the second-stage deceleration. Then, the output shaft 19 fitted by the planetary carrier 49 and the spline 56 rotates, the inner ring side member 14 and the wheel 12 fitted by the spline 56 to the output shaft 19 rotate, and the wheel 11 is driven to rotate. be able to.

  As described above, in the wheel drive device according to the present embodiment, the rotational force of the motor 31 disposed in the wheel 12 is decelerated by the plurality of reduction gears 32 and 33 and transmitted to the wheel 12 so that the wheel 11 is transmitted. A lower ball joint 62 configured to be drivable, housing the motor 31 and the speed reducers 32 and 33 in the housing 26, and connecting the end of the lower arm 61 and the lower end of the knuckle arm 29 as a wheel support member, The first reduction gear 32 and the wheel 12 are arranged opposite to each other in the radial direction, and the outer peripheral portion of the housing 26 of the housing 26 and the ring gear 41 constituting the first reduction gear 32 are connected by the spline 45, and the spline 45 The missing tooth portions 27c and 41b are formed at positions facing the lower ball joint 62 in the circumferential direction.

  Accordingly, the housing body 27 and the outer peripheral portion of the ring gear 41 of the first speed reducer 32 are connected by the spline 45 and the missing tooth portions 27c and 41b are formed facing the lower ball joint 62, thereby lowering the housing 26. The amount of protrusion to the first reduction gear 32 is reduced, and a large space (space) can be secured below the first speed reducer 32. A lower ball joint 62 that connects the lower arm 61 and the knuckle arm 29 is disposed in this space. can do. As a result, the lower ball joint 62 can be disposed at the optimum position, and interference between the lower ball joint 62 and the first speed reducer 32 can be prevented, and the angle and position formed by the kingpin center line can be appropriately adjusted. By setting, it is possible to improve the steering performance and steering stability of the vehicle.

  In this case, in the present embodiment, the outer peripheral portion of the ring gear 50 constituting the housing main body 27 and the second reduction gear 33 is connected by the spline 54 and is not provided at a position facing the lower ball joint 62 in the circumferential direction of the spline 54. Teeth 27d and 50b are formed. Therefore, the downward protrusion amount in the housing 26 is further reduced, and a space portion (space) formed below the first and second reduction gears 32 and 33 can be secured, and the lower arm is provided in the space portion. A lower ball joint 62 for connecting 61 and the knuckle arm 29 can be provided.

  In the wheel drive device of the present embodiment, the toothless portions 41b and 50b are provided over a predetermined range in the lower portion in the circumferential direction of the splines 45 and 54, and the inner peripheral surface forming the arc shape of the housing body 27 and the ring gear 41, The outer peripheral surface which makes 50 arc shape is fitted and formed. Therefore, the downward protrusion amount in the housing 26 can be reduced, and a large space (space) can be secured below the speed reducers 32 and 33.

  Moreover, in the wheel drive device of this embodiment, the lower ball joint 62 that connects the end of the lower arm 61 and the lower end of the knuckle arm 29 as a wheel support member, and the reduction gears 32 and 33 are relatively small. A first reduction gear 32 having a diameter is disposed so as to face the radial direction of the wheel 12.

  Therefore, by setting the first reduction gear 32 disposed between the motor 31 and the second reduction gear 33 to the minimum outer diameter, a large space is secured below the first reduction gear 32, and this space portion. In addition, a lower ball joint 62 facing the first reduction gear 32 and the radial direction of the wheel 12 can be disposed. As a result, the lower ball joint 62 can be disposed at the optimum position, and interference between the lower ball joint 62 and the first speed reducer 32 can be prevented, and the angle and position formed by the kingpin center line can be appropriately adjusted. By setting, it is possible to improve the steering performance and steering stability of the vehicle.

  Further, in the wheel drive device of this embodiment, the plurality of reduction gears are constituted by the first reduction gear 32 and the second reduction gear 33, and the first reduction gear 32 and the second reduction gear 33 are connected to the motor 31 with respect to the vehicle. Arranged on the inner side. Therefore, a large space can be secured below the first reduction gear 32, and the lower ball joint 62 can be disposed at the optimum position. In this case, the reduction gears 32 and 33 are configured by a planetary gear mechanism, and the reduction ratio of the first reduction gear 32 is set to be lower than that of the first reduction gear 32. The diameter can be easily formed to the minimum outer diameter.

  Furthermore, in the wheel drive device of the present embodiment, the motor 31, the first reduction gear 32, and the second reduction gear 33 are disposed on the same axis O, so that the motor 31, the first reduction gear 32, and the second reduction gear. The drive unit comprising the speed reducer 33 can be made compact.

  The inner ring side member 14 and the output shaft 19 as the axles are rotatably supported via the hub bearing 23 on the inner peripheral side of the outer ring side member 22 as the wheel support member constituting the wheel support member, while the hub bearing 23 The motor 31 is disposed on the outer peripheral side of the outer ring side member 22. Therefore, the motor 31 can be increased in speed and torque.

  In the above-described embodiment, the lower ball joint 62 that connects the lower arm 61 and the knuckle arm 29 is disposed to face the reduction gears 32 and 33, and the ring of the housing main body 27 and the reduction gears 32 and 33 is provided. The outer peripheral portions of the gears 41 and 50 are connected by the splines 45 and 54, and the toothless portions 27c, 27d, 41b, and 50b are formed at positions facing the lower ball joint 62 in the circumferential direction of the splines 45 and 54. The ring gear of the speed reducer may be connected by a spline and a missing tooth portion may be formed.

  In the above-described embodiment, the lower ball joint 62 that connects the lower arm 61 and the knuckle arm 29 and the first speed reducer 32 having the smallest diameter are arranged facing the radial direction of the wheel 12. Accordingly, the second speed reducer 33 is set to the minimum diameter, and the lower ball joint 62 that connects the lower arm 61 and the knuckle arm 29 and the second speed reducer 33 are arranged opposite to each other in the radial direction of the wheel 12. You may set up. Moreover, although the some reduction gear was comprised with the 1st reduction gear 32 and the 2nd reduction gear 33, you may provide one or three or more reduction gears. In this case, not only the minimum diameter of the plurality of reduction gears, but also a reduction gear having a relatively small diameter may be opposed to the radial direction of the connecting portion between the lower arm and the wheel support member. Furthermore, although the motor 31, the first reduction gear 32, and the second reduction gear 33 have the same axis, and the reduction gears 32, 33 are planetary gear mechanisms, the motor 31, the first reduction gear 32, and the second reduction gear 33 A counter gear mechanism may be employed with different axes.

  As described above, the wheel drive device according to the present invention sets the connecting portion between the lower arm and the wheel support member at the optimum position and prevents interference between the connecting portion and the speed reducer. Is also useful.

It is a longitudinal section showing a wheel drive device concerning one example of the present invention. It is II-II sectional drawing of FIG. 1 showing the 1st reduction gear in the wheel drive device of a present Example.

Explanation of symbols

11 wheel 12 wheel 14 inner ring side member (axle)
19 Output shaft (axle)
22 Outer ring side member (wheel support member, wheel support member)
23 Hub bearing 26 Housing (wheel support member)
27 Housing body 27a, 27b Inner teeth 27c, 27d Notch portion 29 Knuckle arm (wheel support member)
31 motor 32 first reduction gear 33 second reduction gear 35 rotor 36 stator core 37, 46 sun gear 38, 47 planetary gear 39, 40, 48, 49 planetary carrier 41, 50 ring gear 41a, 50a external teeth 41b, 50b missing teeth 45, 54 Spline 71, 72 Notch

Claims (5)

  In a wheel driving device that drives a wheel by decelerating a rotational force of a motor disposed in a wheel by a speed reducer and transmitting it to the wheel, the motor and the speed reducer are housed in a housing, and a lower arm and a wheel A connecting portion with the support member is disposed opposite to the radial direction of the speed reducer and the wheel, and an outer peripheral portion of the ring gear constituting the housing and the speed reducer is connected by a spline. A wheel drive device characterized in that a missing tooth portion is formed at a position facing the connecting portion in the direction.   2. The wheel drive device according to claim 1, wherein the missing tooth portion is provided in a lower portion in a circumferential direction of the spline over a predetermined range, and an inner peripheral surface forming an arc shape of the housing and an outer periphery forming an arc shape of the ring gear. A wheel drive device characterized in that the surfaces are formed by fitting.   3. The wheel drive device according to claim 1, wherein the speed reducer includes a first speed reducer and a second speed reducer, and the first speed reducer and the second speed reducer are configured with respect to the motor. An outer peripheral portion of a ring gear disposed on the vehicle inner side and constituting at least one of the first reduction gear and the second reduction gear is connected to the housing by a spline, and A wheel drive device characterized in that a missing tooth portion is formed at a position facing the connecting portion in the direction.   4. The wheel drive device according to claim 1, wherein the speed reducer includes a planetary gear mechanism having a sun gear, a plurality of planetary gears, a planetary carrier, and the ring gear. Wheel drive to do.   The wheel drive device according to any one of claims 1 to 4, wherein the motor and the speed reducer are disposed on the same axis.

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