JP2005178663A - Motor-driven wheel driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven wheel driving device capable of enhancing the durability of the bearings for vehicle wheels, accomplishing the device in a lightweight and compact construction, and enhancing the running performance of the vehicle. <P>SOLUTION: The motor-driven wheel driving device includes bearing devices 2 for vehicle wheels each equipped with a hub ring 7 having a wheel mounting flange 6 and furnished on one side with an inner runway surface 7a, an inner ring 8 furnished with another inner runway surface 8a, an outer member 9 furnished with outer runway surfaces 9a formed in rows, and double-row rolling elements 10, wherein the arrangement further includes an epicyclic speed reducer 3 equipped with a sun roller 17 inserted into the hub ring 7, a plurality of planet rollers 15b arranged between it and the outer member 9, and a carrier pin 14 to bear them on the hub ring 7 rotatably, and also a drive part 5 equipped with an electric motor M consisting of a stator part 18 and a rotor part 22 arranged in a single piece with the outer member 9 and a rotary member 24 supported rotatably by the outer member 9, wherein the rotary member 24 is coupled with the sun roller 17 so that the rotation of the motor M is transmitted to the hub ring 7 through the epicyclic speed reducer 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric wheel drive device that is used in an electric vehicle, a golf cart, or a vehicle such as a forklift, and in which a wheel and an electric motor are integrated.

  The electric wheel drive device is proposed to increase the driving efficiency when the wheels are driven by an electric motor, and is used for driving wheels of an electric vehicle or the like, and directly rotates and drives the wheels by the electric motor. It is configured as follows. However, since this type of electric wheel drive device requires a large output torque for the electric motor, a large electric motor must be used. This not only increases the cost, but also increases the weight, making it difficult to ensure sufficient vehicle performance.

  On the other hand, an electric motor and a planetary gear speed reducer are arranged in the inner space portion of the wheel, and the rotation output of the electric motor is transmitted to the wheel via the planetary gear speed reducer. A drive device (wheel motor) has already been proposed.

  However, a planetary gear reducer is adopted as the reducer, and the output shaft that transmits the rotation output of the rotor of the electric motor to the wheels via the planetary gear reducer is once divided in the axial direction of the electric wheel drive device. Since the output will be taken out later by aligning the shaft center, the configuration is complicated and difficult to assemble, and the support span of the output shaft must be shortened, so the support strength against the falling of the wheel is low. It was.

  As a solution to these problems, an electric wheel drive device as shown in FIG. 13 is known. The electric wheel drive device 51 includes an electric motor 54 and a gear reducer 55 inside a wheel 53 on which a tire 52 is mounted, and is configured to rotationally drive the wheel 53 by the rotation output of the electric motor 54. Has been.

  The electric motor 54 includes a stator 57 that is fixed to the case 56 disposed inside the wheel 53, a rotor 58 that is disposed opposite to the inside of the stator 57, and a rotational output of the rotor 58 that is used as a gear reducer 55. And an output shaft 59 that is transmitted to the wheel 53 via the. The stator 57 and the rotor 58 are fixed to the case 56 side while being sandwiched between the covers 60 and 61 to constitute the electric motor 54.

  The output shaft 59 is integrally formed with an attachment flange 62 at one end portion 59 a thereof, and a wheel 53 is fixed via a hub bolt 63. One end portion 59a of the output shaft 59 is rotatable via a rolling bearing 64 in the shaft insertion hole 56b of the case 56, and the other end portion 59b is rotatable via a rolling bearing 65 in the central recess 60a of the outer cover 60. It is supported.

  The gear reducer 55 accommodated in the case 56 is composed of a plurality of gears 55a, 55b, 55c and 55d. The first gear 55 a is integrally formed concentrically with the end portion of the rotor 58. The second and third gears 55b and 55c are fixed to the same support shaft 66 and rotate integrally with each other, and the second gear 55b and the first gear 55a are engaged with each other. One end 66a of the support shaft 66 is rotatably supported by the recess 61a of the inner cover 61 via the rolling bearing 67, and the other end 66b is rotatably supported by the recess 56a of the case 56 via the rolling bearing 68. Yes. The fourth gear 55d is fixed to the output shaft 59 and meshes with the third gear 55c.

With this configuration, the output shaft 59 of the electric motor 54 passes through the rotation center hole of the fourth gear 55d, which is the final stage of the gear reducer 55, and the shaft insertion hole 58a of the rotor 58. Since both ends are rotatably supported, the components of the gear reducer 55, the inner cover 61, the components of the electric motor 54, and the outer cover 60 are sequentially fitted and assembled with the output shaft 59 as a reference. be able to. Further, since the output shaft 59 is supported by substantially both ends of the electric wheel drive device 51 as a whole, the support span can be maximized so that sufficient support strength against the falling of the wheel 53 is obtained. be able to.
JP-A-7-81436

  In such a conventional electric wheel drive device 51, this type of gear reducer 55 can easily assemble various components, but the electric motor 54 disposed inside the wheel 53 is downsized, and this In order to obtain a high rotational output with the electric motor 54, the space is inevitably increased, so that the installation space for the rolling bearings 64 and 65 for supporting the output shaft 59 is restricted. Therefore, the wheel 53 has fallen, that is, the load capacity with respect to the moment load is insufficient, and improvement has been demanded in terms of improving the durability of the rolling bearings 64 and 65.

  An object of the present invention is to solve such conventional problems, and to provide an electric wheel drive device that improves the durability of a wheel bearing, reduces the weight and size of the device, and improves the running performance of the vehicle. .

  In order to achieve the object, the invention according to claim 1 of the present invention includes a wheel bearing device having a double row bearing, a planetary reduction gear mounted on the wheel bearing device, and the planetary reduction gear. An electric wheel drive device that transmits an electric power to a hub wheel that constitutes the wheel bearing device by decelerating the rotation of the electric motor by the planetary speed reducer. A configuration is adopted in which the stator portion constituting the electric motor is integrally disposed on the outer member of the wheel bearing device.

  As described above, since the stator portion constituting the electric motor is integrally disposed on the outer member of the wheel bearing device, the overall device can be reduced in weight and size, and the unsprung weight of the vehicle can be reduced. As a result, ride comfort and running stability can be improved. Moreover, since the drive part can be stored in the knuckle which comprises a suspension apparatus, an electric motor can be protected from a stepping stone etc.

  The invention according to claim 2 of the present invention includes a wheel bearing device, a planetary reduction gear mounted on the wheel bearing device, and a drive unit having an electric motor for driving the planetary reduction gear. The wheel bearing device includes a hub wheel having a wheel mounting flange at one end, and is fitted on the hub wheel, and at least one inner rolling surface of the double row inner rolling surfaces is formed on the outer periphery. An inner ring, an outer member having a double-row outer rolling surface facing the inner rolling surface on the inner periphery, and a double-row rolling element housed so as to be freely rollable between the both rolling surfaces. The planetary speed reducer includes an input element inserted into the hub wheel, a fixed element disposed on the inner peripheral side of the outer member, and a gap between the fixed element and the input element. A plurality of installed planetary elements and an output element that rotatably supports these planetary elements with respect to the hub wheel The drive unit constitutes the electric motor, the stator unit integrally disposed on the outer member, the rotor unit facing the stator unit via a predetermined air gap, and the rotor unit And a rotating member that is rotatably supported with respect to the outer member, the rotating member being connected to the input element so as to be able to transmit torque, and rotating the electric motor via the planetary speed reducer. Then, the wheel is driven by transmitting to the hub wheel.

  Adopting such a configuration, it is possible to secure a sufficient space for the bearing part, to improve the durability by increasing the bearing strength against moment load, and to reduce the overall weight and size of the device. Can be achieved.

  According to a third aspect of the present invention, since the electric motor is disposed between the double row bearings, it is not affected by the elastic deformation of the bearing portion, and the posture of the electric motor is stably stabilized. Therefore, the efficiency of the electric motor M is improved.

  According to a fourth aspect of the present invention, since the planetary element is disposed between double-row outer rolling surfaces formed on the inner periphery of the outer member, the uneven load on the planetary element is suppressed. And uneven wear of the planetary elements can be suppressed. In addition, an uneven load is not applied to the support bearing, and the posture of the rotor is stabilized.

  In the fifth aspect of the present invention, the axial position of the planetary reducer and the bearing that rotatably supports the rotor portion of the electric motor are substantially matched, so that the rotation axis of the rotor portion is shortened. Thus, the drive unit can be made lighter and more compact. In addition, the load is not applied to the support bearing, and the posture of the rotor can be stabilized.

  Further, in the invention according to claim 6, since the pair of stator portions are sandwiched with respect to the rotor portion of the electric motor via a predetermined axial clearance, the output of the electric motor is reduced. The planetary speed reducer can be further reduced in weight and size.

  The invention according to claim 7 is characterized in that a plurality of rectangular openings are formed on the hub ring and an inner ring fitted to the hub ring in a circumferentially uniform manner, and the circumferential direction of these openings is A recess is formed in the center, and a carrier pin serving as an output element of the planetary speed reducer is fixed to the recess, and the planetary element is rotatably supported on the carrier pin. Sufficiently secured, the durability of the bearing portion can be improved against moment load, and the device can be made lighter and more compact.

  In the invention according to claim 8, a plurality of recesses are formed in the outer periphery of the end portion of the hub wheel, and a carrier pin serving as an output element of the planetary speed reducer is fixed to the recess, and the carrier pin is fixed to the carrier pin. Since the planetary element is rotatably supported, the assembly of the planetary speed reducer can be simplified while reducing the number of processing steps.

  In the invention according to claim 9, since the two-sided width is formed on the carrier pin and the two-sided width is fitted in the recess, the carrier pin is securely fixed to the hub wheel with a simple configuration. In addition, the planetary speed reducer can be easily assembled.

  According to a tenth aspect of the present invention, there is provided a wheel bearing device, a planetary reduction gear mounted on the wheel bearing device, and a drive unit having an electric motor for driving the planetary reduction gear. The wheel bearing device includes a hub wheel having a wheel mounting flange at one end, and is fitted on the hub wheel, and at least one inner rolling surface of the double row inner rolling surfaces is formed on the outer periphery. An inner ring, an outer member having a double-row outer rolling surface facing the inner rolling surface on the inner periphery, and a double-row rolling element housed so as to be freely rollable between the both rolling surfaces. The planetary speed reducer includes an input element inserted into the hub wheel serving as an output element, a fixed element disposed on the inner peripheral side of the outer member, and a rotation with respect to the fixed element. A plurality of fixing elements which are freely supported and engaged with the input element and the hub wheel, The portion constitutes the electric motor, the stator portion integrally disposed on the outer member, the rotor portion facing the stator portion via a predetermined air gap, and the rotor portion are fixed, A rotating member that is rotatably supported with respect to the outer member, the rotating member being connected to the input element so as to be able to transmit torque, and rotating the electric motor to the hub wheel via the planetary speed reducer. The wheel was driven by transmission.

  Since such a configuration is adopted, a sufficient space for the bearing portion can be secured, and the durability of the bearing portion can be improved against a moment load, and the entire device can be reduced in weight and size.

  In the invention according to claim 11, since each element of the planetary reduction gear is transmitted with power by friction, noise and vibration generated during power transmission can be suppressed as much as possible.

  In the invention according to claim 12, since the power of each element of the planetary reduction gear is transmitted by the gear means, the power can be transmitted efficiently without sliding contact.

  An electric wheel drive device according to the present invention includes a wheel bearing device having double-row bearings, a planetary speed reducer mounted on the wheel bearing device, and a drive unit having an electric motor for driving the planetary speed reducer. An electric wheel drive device that decelerates the rotation of the electric motor by the planetary speed reducer and transmits power to a hub wheel that constitutes the wheel bearing device, wherein the stator portion that constitutes the electric motor includes Since it is arranged integrally with the outer member of the wheel bearing device, the overall device can be reduced in weight and size, and the unsprung weight of the vehicle can be reduced to improve ride comfort and running stability. Can do. Moreover, since the drive part can be stored in the knuckle which comprises a suspension apparatus, an electric motor can be protected from a stepping stone etc.

  An electric wheel drive device according to the present invention includes a wheel bearing device, a planetary reduction gear mounted on the wheel bearing device, and a drive unit having an electric motor for driving the planetary reduction device, The wheel bearing device includes a hub ring having a wheel mounting flange at one end thereof, and an inner ring that is externally fitted to the hub ring and at least one inner rolling surface of the double row inner rolling surfaces is formed on the outer periphery. And an outer member in which a double row outer rolling surface facing the inner rolling surface is formed on the inner periphery, and a double row rolling element accommodated so as to roll between both rolling surfaces. The planetary speed reducer is disposed between the fixed element and the input element, the input element inserted in the hub wheel, the fixed element disposed on the inner peripheral side of the outer member. A plurality of planetary elements and an output element for rotatably supporting the planetary elements with respect to the hub wheel; The drive unit constitutes the electric motor, the stator unit integrally disposed on the outer member, the rotor unit facing the stator unit via a predetermined air gap, and the rotor unit A rotating member that is fixed and rotatably supported with respect to the outer member, the rotating member being connected to the input element so as to be able to transmit torque, and rotating the electric motor via the planetary speed reducer. Since the wheel is driven by being transmitted to the hub wheel, a sufficient space for the bearing portion can be secured, and the durability of the bearing portion can be improved by increasing the support strength against the moment load, and The entire device can be reduced in weight and size.

  Furthermore, the electric wheel drive device according to the present invention includes a wheel bearing device, a planetary speed reducer mounted on the wheel bearing device, and a drive unit having an electric motor that drives the planetary speed reducer, The wheel bearing device includes a hub ring having a wheel mounting flange at one end thereof, and an inner ring that is externally fitted to the hub ring and at least one inner rolling surface of the double row inner rolling surfaces is formed on the outer periphery. And an outer member in which a double row outer rolling surface facing the inner rolling surface is formed on the inner periphery, and a double row rolling element accommodated so as to roll between both rolling surfaces. The planetary speed reducer includes an input element inserted into the hub wheel serving as an output element, a fixed element disposed on the inner peripheral side of the outer member, and is rotatable with respect to the fixed element. A plurality of fixed elements supported and engaged with the input element and a hub wheel; Comprises the stator part that is integrated with the outer member, the rotor part that is opposed to the stator part via a predetermined air gap, and the rotor part is fixed to the outer part. A rotating member rotatably supported with respect to the side member, the rotating member being connected to the input element so as to be able to transmit torque, and transmitting the rotation of the electric motor to the hub wheel via the planetary speed reducer. Since the wheel is driven, a sufficient space for the bearing portion can be secured, and the durability of the bearing portion can be improved against a moment load, and the entire device can be reduced in weight and size.

  A wheel bearing device, a planetary speed reducer, and a drive unit having an electric motor, the wheel bearing device having a wheel mounting flange at one end and the inner side of one of the double row inner rolling surfaces on the outer periphery. A rolling ring, a hub ring formed with a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface, and a double-row inner rolling surface that is externally fitted to the small-diameter step portion of the hub ring An inner ring having the other inner rolling surface, an outer member having a double row outer rolling surface facing the inner rolling surface on the inner periphery, and a rolling member between the two rolling surfaces. A plurality of rolling elements accommodated in a freely movable manner, and a crimped portion is formed by plastically deforming an end portion of the small diameter step portion radially outward, and the inner ring is connected to the hub wheel by the crimped portion. The planetary speed reducer includes a sun roller inserted in the hub wheel, the outer member, and the solar low. A plurality of planetary rollers disposed between the carrier wheel and a carrier pin that rotatably supports the planetary roller with respect to the hub wheel, and the drive unit is disposed integrally with the outer member. An electric motor comprising a stator part and a rotor part facing the stator part via a predetermined air gap, and a rotating member to which the rotor part is fixed and rotatably supported with respect to the outer member The electric motor is disposed between the rolling surfaces of the double row, the rotating member is connected to the sun roller so as to be able to transmit torque, and the rotation of the electric motor is transmitted through the planetary speed reducer. It was transmitted to the hub wheel to drive the wheel.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of an electric wheel drive device according to the present invention, FIG. 2 is a partial cross-sectional view taken along an arrow A of FIG. 1, and FIG. It is a principal part cross-sectional view along the III-III line.

  The electric wheel drive device 1 includes a wheel bearing device 2, a planetary speed reducer 3 attached to the wheel bearing device 2, and a drive unit 5 that integrally includes a rotating shaft 4 of the planetary speed reducer 3. Main structure. In the following description, the side closer to the outside of the vehicle in the state assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side near the center is referred to as the inboard side (right side in the drawing).

  The wheel bearing device 2 is referred to as a third generation for supporting a driving wheel (not shown). This wheel bearing device 2 integrally has a wheel mounting flange 6 for mounting a wheel at an end portion on the outboard side, and an inner rolling surface 7a is formed on the outer periphery, and the inboard from the inner rolling surface 7a. A hub wheel 7 formed with a cylindrical small-diameter step 7b extending to the side, an inner ring 8 press-fitted into the small-diameter step 7b of the hub wheel 7 and formed with an inner rolling surface 8a on the outer periphery, and a vehicle body on the outer periphery An outer member 9 integrally having a vehicle body mounting flange 9b for fixing to the inner surface, and formed with double row outer rolling surfaces 9a, 9a facing the inner rolling surfaces 7a, 8a on the inner periphery, and A double-row rolling element (ball) 10 accommodated between both rolling surfaces so as to be freely rollable, and a bearing cage 11 for holding the rolling elements 10 at a uniform circumference are provided. Seals 9c and 9c are attached to both ends of the outer member 9 to prevent leakage of grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing.

  On the outer peripheral surface of the hub wheel 7, a hardened layer having a surface hardness in the range of 54 to 64 HRC from the inner rolling surface 7 a to the small-diameter step portion 7 b including the seal land portion serving as the base of the wheel mounting flange 6. Is formed. As the heat treatment, local heating is preferable, and quenching by high-frequency induction heating that can set the hardened layer depth relatively easily is preferable. Here, the end portion on the inboard side of the hub wheel 7 is unquenched with a surface hardness of 25 HRC or less, and is plastically deformed radially outward to form a crimped portion 7c. The inner ring 8 press-fitted into the small-diameter step portion 7b of the hub wheel 7 is fixed in the axial direction by the caulking portion 7c.

  In the present embodiment, the bearing internal rigidity is improved by using the internal clearance of the bearing as a negative clearance, and the inner ring 8 is fixed in the axial direction by the crimping portion 7c so that the preload amount can be maintained over a long period of time. Retain structure is adopted. Therefore, it is not necessary to manage the preload by firmly tightening the bearing portion with a nut or the like as in the prior art, so that the ease of incorporation into the vehicle can be simplified. In addition, although the double row angular contact ball bearing which used the ball for the rolling element 10 was illustrated here, not only this but the double row tapered roller bearing using a tapered roller may be sufficient.

  FIG. 2 is a partial cross-sectional view of the main part of FIG. A plurality of rectangular openings 12 are formed on the small-diameter stepped portion 7b and the butting portion 7d of the hub wheel 7 in a circumferentially equidistant manner, and the butting portion 8b of the inner ring 8 at a position corresponding to the opening 12 is also provided. An opening 13 made of a recess 13a is formed. Recesses 12a and 13b are respectively formed in the center portions in the circumferential direction of the openings 12 and 13, and a carrier pin (output element) 14 of the planetary speed reducer 3 to be described later is fixed. As shown in FIG. (Planet element) 15 is rotatably supported.

  Both end portions of the carrier pin 14 are formed to have two-sided widths 14a and 14a, and are supported in a non-rotatable manner by being fitted into the recesses 12a and 13b. The planetary roller 15 is rotatably supported via the rolling bearing 16 with respect to the carrier pin 14. As shown in FIG. 3, the planetary roller 15 rolls along the inner peripheral surface 9 d of the outer member 9 and the outer peripheral surface 17 a of the sun roller (input element) 17. Here, an example in which the inner raceway surface 7a and the small-diameter step portion 7b are formed directly on the outer periphery of the hub wheel 7 and the inner ring 8 is abutted against the step portion is illustrated, but the present invention is not limited to this. A second generation structure in which a pair of inner rings 8 and 8 are press-fitted into the small-diameter step portion 7 b of the ring 7 may be applied. In this case, the openings 13 and 13 are formed in the butted portions 8b and 8b of the pair of inner rings 8 and 8.

  In FIG. 1, the planetary speed reducer 3 performs a planetary motion around the sun roller 17 that is connected to the end of the rotating shaft 4 on the outboard side so as not to be relatively rotatable, such as press-fitting or serration fitting. Four planetary rollers 15 and carrier pins 14 that rotatably support the planetary rollers 15 with respect to the hub wheel 7 and the inner ring 8 are provided.

  The rotation of the rotating shaft 4 is transmitted to the planetary roller 15 via the sun roller 17, and the rotation of the planetary roller 15 is transmitted to the wheel via the hub wheel (carrier) 7. Therefore, since the power transmission between the sun roller 17 and the planetary roller 15 and the planetary roller 15 and the outer member (fixed element) 9 is performed by friction transmission (traction drive), noise and vibration generated during power transmission can be reduced. It can be suppressed as much as possible.

  The reduction ratio of the planetary speed reducer 3 can be adjusted as appropriate by changing the ratio of the outer diameter of the planetary roller 15 and the inner diameter of the outer member 9. For example, the reduction ratio can be applied to an electric wheel drive device for an electric vehicle. In this case, the reduction ratio can be set in the range of 3-9. Furthermore, if a reduction ratio of this degree is obtained, it can be sufficiently dealt with by reducing the outer diameter of the sun roller 17, and the reduction gear does not increase in size as the reduction ratio is increased. Further, since the planetary roller 15 is disposed between the double-row outer rolling surfaces 9a, 9a formed on the inner periphery of the outer member 9 in the wheel bearing device 2, the planetary roller 15 with respect to the moment load. In addition, it is possible to suppress a biased load from acting on the sun roller 17. Moreover, this can also suppress uneven wear of the planetary roller 15 and the sun roller 17.

  FIG. 4 is a fragmentary view taken along line IV-IV in FIG. 1 and shows the stator portion 18 constituting the drive portion 5. The stator portion 18 is built in a concave portion 19 formed on the inboard side surface of the vehicle body mounting flange 9b of the outer member 9, and includes a stator iron core 20 and a stator coil 21 wound around the iron core 20. Yes.

  FIG. 5 is an essential part arrow view taken along line VV in FIG. 1 and shows the rotor part 22 constituting the drive part 5. The rotor portion 22 is disposed so as to face the stator portion 18 via a predetermined axial clearance, and includes a plurality of rotor magnets 23 and a rotating member 24 having the rotor magnets 23 fixed to the outer peripheral portion. . Further, the rotor magnet 24 is formed in a substantially sector shape and is constituted by a permanent magnet.

  As shown in FIG. 1, the rotating member 24 is formed in a cup shape with the rotating shaft 4 projecting from the center thereof, and is supported rotatably on the outer member 9 via a rolling bearing 25. Yes. When the electric motor M composed of the stator portion 18 and the rotor portion 22 is energized, the rotating member 24 rotates, and the rotation of the rotating member 24 is transmitted to the planetary speed reducer 3 via the rotating shaft 4. Then, the planetary reduction gear 3 decelerates at a predetermined reduction ratio and is transmitted to the wheels via the hub wheel 7.

  In this embodiment, since the planetary roller 15 which comprises the planetary reduction gear 3 is incorporated between the outer rolling surfaces 9a of the outer member 9 which comprises the wheel bearing apparatus 2, the space of a bearing part is enough. In addition to being able to ensure, even with respect to the moment load, the load can be equally applied by the double-row bearings, so that it is possible to suppress the uneven load from acting on the planetary roller 15 and the sun roller 17. Further, since the electric motor M constituting the drive unit 5 is integrally formed with the vehicle body mounting flange 9b of the outer member 9, the apparatus can be made compact in the axial direction, and the electric motor M can be used as a wheel bearing. The device 2 can be disposed in the approximate center of the axial position of the device 2, that is, between the double row bearings, and is not affected by the elastic deformation of the bearing portion, so that the attitude of the electric motor M is stabilized and the stator portion 18 and the rotor Since the air gap with the part 22 does not change, the efficiency of the electric motor M is improved. Furthermore, since the drive part 5 can be accommodated in the knuckle which is not shown in figure, the electric motor M can be protected from a stepping stone etc.

  FIG. 6 is a longitudinal sectional view showing a second embodiment of the electric wheel drive device according to the present invention. This second embodiment is different from the first embodiment described above only in the arrangement of the planetary speed reducer, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed descriptions thereof are given. Omitted.

  As in the first embodiment, the wheel bearing device 26 is referred to as a third generation that supports a driving wheel (not shown). This wheel bearing device 26 integrally has a wheel mounting flange 6 for attaching a wheel to an end portion on the outboard side, and an inner raceway surface 7a is formed on the outer periphery. A hub ring 27 formed with a cylindrical small-diameter stepped portion 7b extending to the side, an inner ring 8 press-fitted into the small-diameter stepped portion 7b of the hub ring 27 and formed with an inner rolling surface 8a on the outer periphery, and a vehicle body on the outer periphery An outer member 29 integrally having a vehicle body mounting flange 9b for fixing to the inner surface, and formed with double-row outer rolling surfaces 9a, 9a facing the inner rolling surfaces 7a, 8a on the inner periphery, and A double-row rolling element (ball) 10 accommodated between both rolling surfaces so as to be freely rollable, and a bearing cage 11 for holding the rolling elements 10 at a uniform circumference are provided.

  The planetary speed reducer 30 includes a sun roller (input element) 17 that is connected to the tip of the rotating shaft 4 so as not to rotate relative thereto, and four planetary rollers (planetary elements) 15 that perform planetary motion around the sun roller 17. The planetary roller 15 includes a carrier pin (output element) 14 that rotatably supports the hub wheel 27 and the inner ring 8. The carrier pin 14 is fitted in a recess 28 formed in the small-diameter step portion 7b of the hub wheel 27 and is supported so as not to rotate. The recess 28 into which the carrier pin 14 is fitted may be formed in the inner ring 8 that is press-fitted into the small diameter step 7b.

  The planetary roller 15 constituting the planetary speed reducer 30 is rotatably supported via the rolling bearing 16 with respect to the carrier pin 14. The outer peripheral surface of the planetary roller 15 rotates in contact with the inner peripheral surface 9e on the inboard side of the outer member (fixed element) 29 and the outer peripheral surface 17a of the sun roller 17, respectively. Here, when the electric motor M is energized, the rotor portion 22 rotates, and the rotating shaft 4 that protrudes integrally with the rotating member 24 rotates. The rotation of the rotating shaft 4 is transmitted to the planetary roller 15 via the sun roller 17, and the planetary roller 15 revolves, that is, decelerates to the hub wheel 27 via the carrier pin 14 and is transmitted to the wheel.

  Also in this embodiment, the planetary roller 15 constituting the planetary reduction gear 30 is incorporated in the end portion on the inboard side of the outer member 29 constituting the wheel bearing device 26 as described above. Space can be secured sufficiently, the assembling of the planetary speed reducer 30 becomes simple, and even with respect to the moment load, the load can be equally applied by the double row bearings. It can suppress that a load acts. Further, since the electric motor M constituting the drive unit 5 is integrally formed with the vehicle body mounting flange 9b of the outer member 29, the apparatus can be made compact in the axial direction, and the electric motor M can be used as a wheel bearing. It can be made to coincide with the approximate center of the axial position of the device 26, is not affected by the elastic deformation of the bearing portion, the posture of the rotor portion 22 is stabilized, and the output of the electric motor M is improved. Furthermore, since the drive part 5 can be accommodated in the knuckle which is not shown in figure, the electric motor M can be protected from a stepping stone etc.

  The rotating member 24 that constitutes the rotor portion 22 is rotatably supported by a rolling bearing 25 provided at an end portion on the inboard side of the outer member 29. Since the axial position of the rolling bearing 25 is made to coincide with the position of the planetary speed reducer 30, at least the rotating shaft 4 can be shortened and the device can be made lighter and more compact. Furthermore, the support bearing 25 is not subjected to an uneven load, and the posture of the rotor 22 can be stabilized.

  FIG. 7 is a longitudinal sectional view showing a third embodiment of the electric wheel drive device according to the present invention. The third embodiment is different from the above-described embodiment only in the configuration of the planetary speed reducer, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof is omitted. .

  The wheel bearing device 31 is referred to as a third generation for supporting a driving wheel (not shown). This wheel bearing device 31 integrally has a wheel mounting flange 6 for mounting a wheel on an end portion on the outboard side, and an inner rolling surface 7a is formed on the outer periphery. A hub wheel 32 formed with a cylindrical small-diameter step portion 7b extending to the side, an inner ring 8 press-fitted into the small-diameter step portion 7b of the hub wheel 32 and formed with an inner rolling surface 8a on the outer periphery, and a vehicle body on the outer periphery An outer member 29 integrally having a vehicle body mounting flange 9b for fixing to the inner surface, and formed with double-row outer rolling surfaces 9a, 9a facing the inner rolling surfaces 7a, 8a on the inner periphery, and A double-row rolling element (ball) 10 accommodated between both rolling surfaces so as to be freely rollable, and a bearing cage 11 for holding the rolling elements 10 at a uniform circumference are provided. The end portion on the inboard side of the hub wheel 32 is plastically deformed radially outward to form a crimped portion 7c, and the inner ring 8 is fixed in the axial direction by the crimped portion 7c.

  The planetary speed reducer 33 includes a sun roller (input element) 17 that is connected to the tip of the rotating shaft 4 so as not to rotate relative thereto, and four planetary rollers (fixed elements) 15 that perform planetary motion around the sun roller 17. A carrier pin (fixed element) 14 that rotatably supports the planetary roller 15 and a non-rotatably supported carrier pin 14, and a relative rotation such as press-fitting or serration fitting to the inner peripheral surface 9 e of the outer member 29. And a disk-shaped fixing plate (fixing element) 34 that is impossiblely fitted.

  The planetary roller 15 constituting the planetary speed reducer 33 is rotatably supported with respect to the carrier pin 14 via a bearing (not shown). The outer peripheral surface of the planetary roller 15 rotates in contact with the inner peripheral surface 32a of the hub wheel (output element) 32 and the outer peripheral surface 17a of the sun roller 17, respectively. Therefore, the rotation of the rotor portion 22 is transmitted to the rotating shaft 4 through the rotating member 24, and the rotation of the rotating shaft 4 is transmitted to the planetary roller 15 through the sun roller 17. The rotation of the planetary roller 15 is transmitted to the wheels via the hub wheel 32.

  In the present embodiment, since the fixed plate 34 constituting the planetary reduction gear 33 is incorporated in the end portion on the inboard side of the outer member 29 constituting the wheel bearing device 31, a sufficient space for the bearing portion can be secured. The planetary speed reducer 30 can be easily assembled, and even with respect to the moment load, the double-row bearing can equally handle the load, so that the load on the planetary roller 15 and the sun roller 17 is prevented from acting. can do. Further, since the electric motor M constituting the drive unit 5 is integrally formed with the vehicle body mounting flange 9b of the outer member 29, the apparatus can be made compact in the axial direction, and the electric motor M can be used as a wheel bearing. The position of the rotor unit 22 can be made stable and the output of the electric motor M can be improved. Furthermore, since the drive part 5 can be accommodated in the knuckle which is not shown in figure, the electric motor M can be protected from a stepping stone etc.

  Further, in the present embodiment, it is not necessary to form a recess in which the carrier pin 14 is fitted in the hub wheel 32 or the inner ring 8, and the number of processing steps and assembly steps are reduced.

  FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the electric wheel drive device according to the present invention. This embodiment differs from the first embodiment (FIG. 1) described above only in the configuration of the drive unit, and other parts having the same parts or the same functions are denoted by the same reference numerals, and detailed description thereof will be given. Omitted.

  The drive part 35 in this embodiment is disposed opposite to the stator part 18 incorporated in a recess 19 formed in a side surface of the outer member 9 on the inboard side of the vehicle body mounting flange 9b. The auxiliary stator portion 36 and the rotating member 37 in which the rotating shaft 4 is integrally formed. The stator portion 18 and the auxiliary stator portion 36 include a stator iron core 20 and a stator coil 21 wound around the stator iron core 20. The auxiliary stator portion 36 is built in a cup-shaped fixing member 38 fitted to the vehicle body mounting flange 9 b of the outer member 9.

  The rotor portion 22 is arranged in a state of being sandwiched between the stator portion 18 and the auxiliary stator portion 36 via a predetermined axial clearance, and is composed of a plurality of rotor magnets 23 formed in a substantially sector shape. The rotor magnet 23 is made of a permanent magnet, and is fixed to the outer periphery of the rotating member 37. The rotor portion 22 and the pair of stator portions 18 and 36 constitute an electric motor M. On the other hand, the rotating member 37 is formed in a disk shape, and the rotating shaft 4 is projected from the center thereof. And it is rotatably supported with respect to the outer member 9 and the fixed member 38 via a pair of rolling bearings 25, 25.

  In the present embodiment, the electric motor M constituting the drive unit 35 includes a pair of stator parts 18 and 36 via the rotor part 22, that is, the stator part 18 integrally incorporated in the vehicle body attachment flange 9 b, and the vehicle body attachment flange. Since the auxiliary stator part 36 built in the fixing member 38 fitted to 9b is provided, the output of the electric motor M can be increased. Therefore, the planetary speed reducer 3 can be further reduced in weight and size as the output increases.

  FIG. 9 is a longitudinal sectional view showing a fifth embodiment of the electric wheel drive device according to the present invention. This embodiment is different from the above-described first embodiment (FIG. 1) only in the configuration of the planetary speed reducer, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof. Is omitted.

  The planetary speed reducer 39 includes a sun gear (input element) 40 that is connected to the tip end of the rotating shaft 4 so as not to rotate relative to it, and four planetary gears (planetary elements) 41 that perform planetary motion around the sun gear 40. And a carrier pin (output element) 14 that rotatably supports the planetary gear 41 with respect to the hub ring 7 and the inner ring 8. The planetary gear 41 is rotatably supported with respect to the carrier pin 14 via the rolling bearing 16. The outer teeth 41 a of the planetary gear 41 are engaged with the inner teeth 9 f formed on the inner peripheral surface of the outer member (fixed element) 42 and the outer teeth 40 a of the sun gear 40 and rotate.

  The rotation of the rotating shaft 4 is transmitted to the planetary gear 41 via the sun gear 40 as in the third embodiment described above, and the rotation of the planetary gear 41 is transmitted to the wheels via the hub wheel 7. Accordingly, it is possible to achieve light weight and compactness, improve the fuel efficiency of the vehicle, and transmit power of the sun gear 40 and the planetary gear 41 and the planetary gear 41 and the outer member 42 by a gear transmission mechanism. Therefore, power can be transmitted efficiently without sliding contact. Further, the planetary speed reducer 39 can be lubricated with the lubricating grease enclosed in the bearing.

  FIG. 10 is a longitudinal sectional view showing a sixth embodiment of the electric wheel drive device according to the present invention. This embodiment is different from the above-described fifth embodiment (FIG. 9) only in the configuration of the planetary speed reducer, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof. Description is omitted.

  The planetary speed reducer 43 includes a sun gear 40 that is connected to the tip of the rotating shaft 4 so as not to rotate relative thereto, four planetary gears 41 that perform planetary movement around the sun gear 40, and the planetary gears 41 are rotatable. A carrier pin 14 that is supported on the disk, and a disk-shaped fixing plate (planetary element) 34 that supports the carrier pin 14 so as not to rotate and is fitted to the inner peripheral surface 9e of the outer member 29 so as not to rotate relative thereto. I have.

  The planetary gear 41 constituting the planetary reduction gear 43 is rotatably supported with respect to the carrier pin 14 via a bearing (not shown). The outer teeth 41 a formed on the outer periphery of the planetary gear 41 mesh with the inner teeth 44 a formed on the inner periphery of the hub wheel (output element) 44 and the outer teeth 40 a of the sun gear 40, respectively. Therefore, the rotation of the rotor portion 22 is transmitted to the rotating shaft 4 through the rotating member 24, and the rotation of the rotating shaft 4 is transmitted to the planetary gear 41 through the sun gear 40. The rotation of the planetary gear 41 is transmitted to the wheels via the hub wheel 44.

  FIG. 11 is a longitudinal sectional view showing a seventh embodiment of the electric wheel drive device according to the present invention. This embodiment is different from the first embodiment (FIG. 1) described above mainly in the configuration of the drive unit, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof. Description is omitted.

  The wheel bearing device 70 integrally has a wheel mounting flange 6 for mounting a wheel at an end portion on the outboard side, and extends to the inboard side from the inner rolling surface 7a on the outer periphery and the inner rolling surface 7a. A hub wheel 7 formed with a cylindrical small-diameter stepped portion 7b, an inner ring 8 press-fitted into the small-diameter stepped portion 7b of the hub wheel 7 and formed with an inner rolling surface 8a on the outer periphery, and fixed to the vehicle body on the outer periphery. An outer member 72 having a vehicle body mounting flange 71 integrally formed therein and formed on the inner periphery thereof with double-row outer rolling surfaces 9a, 9a facing the inner rolling surfaces 7a, 8a, and both of these rolling members. A double row rolling element 10 accommodated in a freely rolling manner between the surfaces, and a bearing cage 11 for holding the rolling elements 10 at an equal circumference are provided. The vehicle body mounting flange 71 integrally formed on the outer periphery of the outer member 72 has a flange portion 71a extending in the radial direction and a cylindrical portion 71b extending from the outer end of the flange portion 71a to the inboard side.

  The drive part 73 includes a stator part 74 fixed to the inner peripheral surface of the cylindrical part 71b of the vehicle body mounting flange 71, and a rotor part 75 disposed opposite to the stator part 74 via a predetermined radial clearance. , And a rotating member 76 to which the rotor portion 75 is fixed. The stator portion 74 includes a stator iron core 77 and a stator coil 78 wound around the stator iron core 77. On the other hand, the rotor portion 75 is constituted by a rotor magnet 79 made of a permanent magnet, and the rotor portion 75 and the stator portion 74 constitute an inner rotor type electric motor M.

  The rotating member 76 is formed in a cup shape, and the rotating shaft 4 protrudes from the center portion, and the rotor portion 75 is fixed to a cylindrical outer peripheral surface. Further, the rotating member 76 is rotatably supported with respect to the outer member 72 via the rolling bearing 25. When the electric motor M is energized, the rotating member 76 rotates, and the rotation of the rotating member 76 is transmitted to the planetary speed reducer 3 via the rotating shaft 4. Then, the planetary reduction gear 3 decelerates at a predetermined reduction ratio and is transmitted to the wheels via the hub wheel 7.

  FIG. 12 is a longitudinal sectional view showing an eighth embodiment of the electric wheel drive device according to the present invention. In this embodiment, only the configuration of the electric motor is different from that of the above-described seventh embodiment (FIG. 11). Is omitted.

  The wheel bearing device 80 integrally has a wheel mounting flange 6 for mounting a wheel at an end on the outboard side, and has an inner rolling surface 7a on the outer periphery and extends from the inner rolling surface 7a to the inboard side. A hub wheel 7 formed with a cylindrical small-diameter stepped portion 7b, an inner ring 8 press-fitted into the small-diameter stepped portion 7b of the hub wheel 7 and formed with an inner rolling surface 8a on the outer periphery, and fixed to the vehicle body on the outer periphery. An outer member 81 integrally having a vehicle body mounting flange 81a for forming a double row of outer rolling surfaces 9a, 9a facing the inner rolling surfaces 7a, 8a on the inner periphery, and both of these rolling members. A double row rolling element 10 accommodated in a freely rolling manner between the surfaces, and a bearing cage 11 for holding the rolling elements 10 at an equal circumference are provided.

  The drive portion 82 includes a stator portion 74 fixed to the outer peripheral surface of the outer member 81, a rotor portion 75 disposed opposite to the stator portion 74 via a predetermined radial clearance, and the rotor portion 75. And a rotating member 83 for fixing the member. The stator portion 74 includes a stator iron core 77 and a stator coil 78 wound around the stator iron core 77. On the other hand, the rotor portion 75 is composed of a rotor magnet 79 made of a permanent magnet, and the rotor portion 75 and the stator portion 74 constitute an outer rotor type electric motor M.

  The rotating member 83 is formed in a cup shape, and the rotating shaft 4 protrudes from the center portion, and the rotor portion 75 is fixed to the cylindrical inner peripheral surface. The rotating member 83 is rotatably supported with respect to the outer member 81 via the rolling bearing 25. When the electric motor M is energized, the rotating member 83 rotates, and the rotation of the rotating member 83 is transmitted to the planetary reduction gear 3 through the rotating shaft 4. Then, the planetary reduction gear 3 decelerates at a predetermined reduction ratio and is transmitted to the wheels via the hub wheel 7.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The electric wheel drive device according to the present invention is a four-wheeled vehicle such as a fuel cell vehicle and an electric vehicle, a two-wheeled vehicle, a golf cart, a three-wheeled or four-wheeled cart for elderly people and persons with disabilities, and a construction site or a transportation industry. The present invention can be applied to a case where various vehicles such as a hand-held unicycle to a four-wheel vehicle to be used are electrically driven, or when auxiliary power is applied by electric drive.

It is a longitudinal section showing a 1st embodiment of an electric wheel drive concerning the present invention. It is a partial cross section A arrow line view of FIG. It is a cross-sectional view along the III-III line of FIG. It is a principal part arrow line view along the IV-IV line of FIG. It is a principal part arrow line view along the VV line of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 4th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 5th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 6th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 7th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 8th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional electric wheel drive device.

Explanation of symbols

1... Electric wheel drive device 2, 26, 31, 70, 80... Wheel bearing device 3, 30, 33, 39, 43・ ・ ・ ・ ・ Planet reducer 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotating shaft 5, 35, 73, 82 ・ ・ ・ ・ ・ ・ ・ ・ Driver 6 ・ ・ ・..... Wheel mounting flanges 7, 27, 32, 44 ..... Hub wheels 7a, 8a ..... Rolling surface 7b ············ Small diameter step 7c ········· Abutting portion 8 ································ Inner ring 9, 29, 42, 72, 81 ... ..... External rolling surface 9b, 71, 81a ...・ Vehicle mounting flange 9c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 9d, 9e, 32a ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner peripheral surface 9f, 44a ・ ・ ・ ・ ・ ・ ・ ・.... Internal teeth 10 ... Rolling elements 11 ... Bearing cages 12, 13, 13a ......... Openings 12a, 13b, 28 ......... Recess 14 ......... Carrier pin 14a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Width across flat 15 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Planet rollers 16, 25 ・ ・ ・ ・ ・ ・ ・ ・ Rolling Bearing 17 ... Sun roller 17a ... Outer peripheral surface 18, 74 .... Stator 19 ... Portions 20, 77 ... Stator cores 21, 78 ... Stator coils 22, 75 ... ... Rotor parts 23, 79 ... Rotor magnets 24, 37, 76, 83 ... Rotary member 34 ...・ ・ ・ ・ ・ ・ Fixing plate 36 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Auxiliary stator 38 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing member 40 ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sun gear 40a, 41a ・ ・ ・ ・ ・ ・ External teeth 41 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Planet Gear 51 ... Electric wheel drive 52 ... Tire 53 ... ... wheel 54 ...・ ・ Electric motor 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gear reducer 55a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First gear 55b ・ ・ ・2nd gear 55c ... 3rd gear 55d ... Fourth gear 56 ..... Cases 56a, 60a, 61a ..... Recessed part 56b .....・ Through hole 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stator 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotor 59 ..... output shaft 59a, 66a ......... one end 59b, 66b ......... other end 60, 61 ... ········ Cover 60b ································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mounting flange 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolts 64, 65, 67, 68 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling Bearing 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Support shaft M ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electric motor

Claims (12)

A wheel bearing device having a double-row bearing, a planetary reduction gear mounted on the wheel bearing device, and a drive unit having an electric motor for driving the planetary reduction gear;
In the electric wheel drive device that transmits the power to the hub wheel constituting the wheel bearing device by decelerating the rotation of the electric motor by the planetary speed reducer,
An electric wheel driving device characterized in that a stator portion constituting the electric motor is integrally disposed on an outer member of the wheel bearing device. A wheel bearing device, a planetary speed reducer mounted on the wheel bearing device, and a drive unit having an electric motor for driving the planetary speed reducer,
The wheel bearing device includes a hub ring having a wheel mounting flange at one end thereof, and an inner ring that is externally fitted to the hub ring and at least one inner rolling surface of the double row inner rolling surfaces is formed on the outer periphery. And an outer member in which a double row outer rolling surface facing the inner rolling surface is formed on the inner periphery, and a double row rolling element accommodated so as to roll between both rolling surfaces. Prepared,
The planetary speed reducer includes an input element inserted into the hub wheel, a fixed element disposed on the inner peripheral side of the outer member, and a plurality of elements disposed between the fixed element and the input element. A planetary element and an output element that rotatably supports the planetary element with respect to the hub wheel,
The drive unit constitutes the electric motor, and a stator unit integrally disposed on the outer member, a rotor unit facing the stator unit via a predetermined air gap, and the rotor unit are fixed. A rotating member that is rotatably supported with respect to the outer member, the rotating member being connected to the input element so as to be able to transmit torque, and rotating the electric motor via the planetary speed reducer. An electric wheel drive device that transmits a wheel to drive the wheel.   The electric wheel drive device according to claim 1 or 2, wherein the electric motor is disposed between the double row bearings.   The electric wheel drive device according to any one of claims 1 to 3, wherein the planetary element is disposed between double row outer rolling surfaces formed on an inner periphery of the outer member.   The electric wheel drive device according to any one of claims 1 to 3, wherein axial positions of a bearing that rotatably supports a rotor portion of the electric motor and the planetary speed reducer are substantially matched.   The electric wheel drive device according to any one of claims 1 to 5, wherein a pair of stator portions are sandwiched with respect to a rotor portion of the electric motor via a predetermined axial clearance.   A plurality of rectangular openings are formed on the hub ring and an inner ring fitted to the hub ring in a circumferentially equidistant manner, and a recess is formed at the center in the circumferential direction of the openings. The electric wheel drive device according to any one of claims 2 to 6, wherein a carrier pin serving as an output element of the planetary reduction gear is fixed in the recess, and the planetary element is rotatably supported on the carrier pin.   A plurality of recesses are formed in the outer periphery of the end portion of the hub wheel, a carrier pin serving as an output element of the planetary speed reducer is fixed to the recess, and the planetary element is rotatably supported on the carrier pin. Item 7. The electric wheel drive device according to any one of Items 2 to 6.   The electric wheel drive device according to claim 7 or 8, wherein a two-sided width is formed on the carrier pin, and the two-sided width is fitted in the recess. A wheel bearing device, a planetary speed reducer mounted on the wheel bearing device, and a drive unit having an electric motor for driving the planetary speed reducer,
The wheel bearing device includes a hub ring having a wheel mounting flange at one end thereof, and an inner ring that is externally fitted to the hub ring and at least one inner rolling surface of the double row inner rolling surfaces is formed on the outer periphery. And an outer member in which a double row outer rolling surface facing the inner rolling surface is formed on the inner periphery, and a double row rolling element accommodated so as to roll between both rolling surfaces. Prepared,
The planetary speed reducer is supported by an input element inserted into the hub wheel serving as an output element, a fixed element disposed on the inner peripheral side of the outer member, and a rotatable element with respect to the fixed element. A stator portion that includes the input element and a plurality of fixed elements that are engaged with the hub wheel, and the drive portion constitutes the electric motor and is integrally disposed on the outer member; and the stator portion And a rotating member fixed to the outer member and rotatably supported by the outer member. The rotating member transmits torque to the input element. An electric wheel drive device, wherein the electric wheel drive device is connected so as to drive the wheel by transmitting the rotation of the electric motor to the hub wheel via the planetary speed reducer.   The electric wheel drive device according to any one of claims 1 to 10, wherein each element of the planetary speed reducer is powered by friction.   The electric wheel drive device according to any one of claims 1 to 10, wherein each element of the planetary reduction gear is transmitted with power by gear means.

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