JP2005212656A - Motorized wheel driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorized wheel driving device improving the durability of a wheel bearing device, decreasing the size/weight of the device, and improving traveling performance of a vehicle. <P>SOLUTION: The motorized wheel driving device comprises a wheel bearing device 1; a planetary speed reducer 2 installed to the wheel bearing device 1; and a driving portion 4 composed of a rotor 21 adhered to a rotating member 20, and an electric motor 22 having a stator opposite to the rotor 21. Rotations of the electric motor 22 are transmitted to a hub ring 5 by the planetary speed reducer 2. The planetary speed reducer 2 comprises a sun roller 17, a plurality of planetary rollers 15 rolling along an inner peripheral surface of an outward member 8, and carrier pin 14 rotatably supporting these planetary rollers 15 to a hub ring 7. The driving portion 4 comprises a stator housing 18 including the stator 19, and a rotating member 20 rotatably supported to the stator housing 18. A disc brake 24 is integrally installed to the rotating member 20. <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. 21 is known. The electric wheel drive device 101 includes an electric motor 104 and a gear reducer 105 inside a wheel 103 on which a tire 102 is mounted, and is configured to rotationally drive the wheel 103 by the rotation output of the electric motor 104. Has been.

  The electric motor 104 includes a stator 107 fixed to the case 106 disposed inside the wheel 103, a rotor 108 disposed opposite to the inside of the stator 107, and the rotational output of the rotor 108 as a gear reducer 105. And an output shaft 109 that is transmitted to the wheel 103 via the wheel. The stator 107 and the rotor 108 are fixed to the case 106 side while being sandwiched between the covers 110 and 111 to constitute the electric motor 104.

  The output shaft 109 has a mounting flange 112 integrally formed at one end 109 a thereof, and a wheel 103 is fixed via a hub bolt 113. One end 109a of the output shaft 109 is rotatable in a shaft insertion hole 106b of the case 106 via a rolling bearing 114, and the other end 109b is rotatable in a central recess 110a of the outer cover 110 via a rolling bearing 115. It is supported.

  The gear reducer 105 accommodated in the case 106 is composed of a plurality of gears 105a, 105b, 105c and 105d. The first gear 105 a is integrally formed concentrically with the end portion of the rotor 108. The second and third gears 105b and 105c are fixed to the same support shaft 116 and rotate integrally with each other, and the second gear 105b and the first gear 105a are engaged with each other. One end 116a of the support shaft 116 is rotatably supported by the recess 111a of the inner cover 111 via the rolling bearing 117, and the other end 116b is rotatably supported by the recess 106a of the case 106 via the rolling bearing 118. Yes. The fourth gear 105d is fixed to the output shaft 109 and meshes with the third gear 105c.

With such a configuration, the output shaft 109 of the electric motor 104 passes through the rotation center hole of the fourth gear 105d, which is the final stage of the gear reducer 105, and the shaft insertion hole 108a of the rotor 108. Since both ends are rotatably supported, the components of the gear reducer 105, the inner cover 111, the components of the electric motor 104, and the outer cover 110 are sequentially fitted and assembled with reference to the output shaft 109. be able to. Further, since the output shaft 109 is supported by substantially both ends of the electric wheel drive device 101 as a whole, the support span can be taken as long as possible, so that sufficient support strength against the falling of the wheel 103 is obtained. be able to.
JP-A-7-81436

  In such a conventional electric wheel drive device 101, this type of gear reducer 105 can easily assemble various components, while miniaturizing the electric motor 104 disposed inside the wheel 103. In order to obtain a high rotational output by the electric motor 104, a space is inevitably increased, and thus the installation space for the rolling bearings 114 and 115 for supporting the output shaft 109 is limited. Therefore, the wheel 103 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 114 and 115.

  It is an object of the present invention to provide an electric wheel drive device that solves these conventional problems, improves the durability of the wheel bearing device, reduces the size and weight of the device, and improves the running performance of the vehicle. To do.

  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. A rotating member integrally having a rotating shaft, a rotor integrally fixed to the rotating member, and a drive unit comprising an electric motor having a stator disposed opposite to the rotor via a predetermined gap. The rotation of the electric motor is decelerated by the planetary speed reducer to transmit power to the hub wheel constituting the wheel bearing device, and the braking device is integrally mounted on the rotating member. did.

  Thus, a wheel bearing device having a double row bearing, a planetary speed reducer mounted on the wheel bearing device, a rotating member integrally having a rotating shaft of the planetary speed reducer, and a mounting on the rotating member A drive unit comprising a motor-driven electric motor, wherein the rotation of the electric motor is decelerated by the planetary speed reducer to transmit power to the hub wheel constituting the wheel bearing device and to rotate the drive unit. Since the braking device is integrally mounted on the member, a sufficient space for the bearing portion can be ensured, and the weight and size can be reduced. In addition, the cost can be reduced by sharing the parts, and the braking action can be applied before the vehicle is decelerated, so that the braking torque can be reduced and a lightweight and compact braking device in the radial direction can be provided.

  According to a second aspect of the present invention, in the wheel bearing device, at least one of a hub wheel having a wheel mounting flange at one end portion and a hub wheel press-fitted into the hub wheel and a double row inner rolling surface on the outer periphery. An inner ring formed with an inner rolling surface, an outer member formed with a double row outer rolling surface facing the inner rolling surface on the inner periphery, and freely rollable between the two rolling surfaces. The planetary reducer includes an input element inserted into the hub wheel, a fixing element disposed on an inner peripheral side of the outer member, and the fixing element. A plurality of planetary elements disposed between the first and second input elements, and an output element that rotatably supports the planetary elements with respect to the hub wheel. Built-in stator housing and rotatably supported with respect to the stator housing Since the rotating member is connected to the input element so as to be able to transmit torque, and the rotation of the electric motor is transmitted to the hub wheel via the planetary reduction gear, the wheel is driven. It is possible to secure a sufficient space for the bearing part, to reduce the weight and weight, and to improve the durability of the bearing part against the moment load applied to the device and to reduce the unsprung weight of the vehicle. Riding comfort and running stability can be improved.

  According to a third aspect of the present invention, the wheel bearing device includes a hub wheel having a wheel mounting flange at one end thereof, and at least one of the inner row rolling surfaces in a double row on the outer periphery thereof. An inner ring formed with an inner rolling surface, an outer member formed with a double row outer rolling surface facing the inner rolling surface on the inner periphery, and freely rollable between the two rolling surfaces. The planetary reducer includes an input element inserted into the hub wheel serving as an output element, and a fixed element disposed on the inner peripheral side of the outer member. A plurality of fixed elements that are rotatably supported with respect to the fixed element and engaged with the input element and a hub wheel, and the drive unit is fixed to a vehicle body and includes a stator housing with a built-in stator. A rotating member rotatably supported with respect to the stator housing, The rotation member is connected to the input element so as to be able to transmit torque, and the rotation of the electric motor is transmitted to the hub wheel via the planetary speed reducer to drive the wheel. As well as ensuring the durability of the bearing portion against the moment load, the entire device can be reduced in weight and size. Furthermore, at least the processing man-hours for the hub wheel can be reduced, and the man-hours for assembling the planetary reduction gear can be reduced, thereby reducing the cost of the apparatus.

  Preferably, if the braking device is a parking brake as in the invention described in claim 4, the parts can be shared, and the parking brake that has been conventionally disposed on the wheel side is moved to the inboard side. Therefore, the degree of freedom in layout can be improved by securing the space around the wheel bearing device.

  More preferably, as in the invention according to claim 5, the parking brake includes an intermediate member that is held in the stator housing so as to be able to transmit torque, and an actuator that displaces the intermediate member and engages the rotating member. The parking brake can be integrated with the drive unit, and the degree of freedom in layout can be improved by securing the space around the wheel bearing device.

  According to a sixth aspect of the present invention, a plurality of recesses are formed in the radially outer portion of the rotating member, and a plurality of through holes are formed in the radially outer portion of the stator housing corresponding to the recesses. The intermediate member having a tapered surface may be accommodated in the through holes, and the intermediate member may be displaced via the cylindrical member engaged with the tapered surface to be engaged with the recess. Further, as in a seventh aspect of the present invention, a plurality of concave portions and a tapered surface are formed in a radially outer portion of the rotating member, and a convex portion and a tapered portion that engage with the concave portion and the tapered surface are formed on the intermediate member. A surface may be formed, and the intermediate member may be held so that torque can be transmitted to the stator housing and axially displaceable. Thus, by engaging the intermediate member with the concave portion of the stator housing, it is possible to secure a braking force larger than that of the conventional parking brake due to slipping, and the device can be lightened and made compact accordingly. .

  In the invention according to claim 8, since the planetary element is disposed between the double row outer rolling surfaces formed on the inner periphery of the outer member, it is possible to suppress the uneven load on the planetary element. And uneven wear of the planetary elements can be suppressed.

  The invention according to claim 9 is characterized in that a plurality of rectangular openings are formed on the hub wheel and an inner ring fitted to the hub wheel in a uniform circumferential arrangement, 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. Furthermore, it is difficult to apply an uneven load to the support bearing, and the rotor posture is stabilized.

  In the invention according to claim 10, a plurality of recesses are formed in the outer periphery of the end portion of the hub wheel, and carrier pins serving as output elements of the planetary speed reducer are fixed to the recesses, and the carrier pins are fixed to the carrier pins. 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 11, since the two-sided width is formed at both ends of the carrier pin and the two-sided width is fitted into the recess, the carrier pin is securely mounted with a simple configuration. It can be fixed to a ring, and the planetary roller can be easily assembled.

  In the invention according to claim 12, the output of the electric motor is increased because the rotor of the electric motor is disposed in a state where the pair of stators are sandwiched via a predetermined axial clearance. In addition, the planetary speed reducer can be further reduced in weight and size.

  In the invention according to claim 13, since each element of the planetary speed reducer is transmitted power by friction means, noise and vibration generated during power transmission can be suppressed as much as possible.

According to the fourteenth aspect of the present invention, since each element of the planetary reduction gear is transmitted with power by gear means, power can be transmitted efficiently without sliding contact, and lubrication enclosed in a bearing can be achieved. Can be lubricated with grease.

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 rotating member integrally including a rotating shaft of the planetary speed reducer. And a drive unit composed of an electric motor having a rotor integrally fixed to the rotating member and a stator disposed opposite to the rotor via a predetermined gap, and the electric motor is rotated. Since the power is transmitted to the hub wheel constituting the wheel bearing device by being decelerated by the planetary speed reducer, and the braking device is integrally mounted on the rotating member, a sufficient space for the bearing portion can be secured. Can be made lighter and more compact. In addition, the cost can be reduced by sharing the parts, and the braking action can be applied before the vehicle is decelerated, so that the braking torque can be reduced and a lightweight and compact braking device in the radial direction can be provided.

  A wheel bearing device having a double-row bearing, a planetary speed reducer mounted on the wheel bearing device, a rotating member integrally having a rotating shaft of the planetary speed reducer, and an integrally fixed to the rotating member A drive unit composed of an electric motor having a rotor and a stator disposed opposite to the rotor via a predetermined gap, and the rotation of the electric motor is decelerated by the planetary reduction gear for the wheel. An electric wheel drive device for transmitting power to a hub wheel constituting a bearing device, wherein the wheel bearing device has a wheel mounting flange at one end and one of inner rolling surfaces in a double row on an outer periphery. A hub ring formed with an inner rolling surface, an inner ring press-fitted into the hub ring and formed with the other inner rolling surface of the double row inner rolling surfaces on the outer periphery, and the inner rolling surface on the inner periphery. Outside where double row outer raceway facing the running surface is formed A rotating shaft inserted in the hub wheel, and one end of the rotating shaft. A plurality of planetary rollers disposed so as to make rolling contact with an outer peripheral surface of the sun roller and an inner peripheral surface of the outer member, and the planetary rollers with respect to the hub wheel. A carrier pin that is rotatably supported, and the drive unit includes a stator housing that is fixed to the vehicle body and includes a stator, and a rotating member that is rotatably supported by the stator housing. Torque is connected to the sun roller so that torque can be transmitted, and the rotation of the electric motor is transmitted to the planetary roller via the sun roller, and the rotation of the planetary roller is transmitted to the wheel via the hub 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 arrow A in FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, and FIG. 5 is a cross-sectional view taken along line V-V in FIG.

  The electric wheel drive device mainly includes a wheel bearing device 1, a planetary speed reducer 2 mounted on the wheel bearing device 1, and a drive unit 4 integrally including a rotating shaft 3 of the planetary speed reducer 2. It is said. 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).

  This wheel bearing device 1 is referred to as a third generation for supporting a driving wheel (not shown). This wheel bearing device 1 integrally has a wheel mounting flange 5a for attaching a wheel to an end portion on the outboard side, an inner rolling surface 5b on the outer periphery, and the inner rolling surface 5b on the inboard side. An inner member comprising a hub ring 5 formed with an extending cylindrical small-diameter step portion 5c, and an inner ring 6 fitted on the small-diameter step portion 5c of the hub ring 5 and having an inner raceway surface 6a formed on the outer periphery. 7 and a body mounting flange 8a that is externally attached to the inner member 7 and fixed to the vehicle body, and has a double row of outer rolling surfaces 8b facing the inner rolling surfaces 5b and 6a on the inner periphery. , 8b, an outer member 8 formed between the rolling surfaces 5b, 8b, 6a, and 8b. And a cage 10 that holds the circumference equally. Further, seals 11 and 11 are attached to both ends of the outer member 8 to prevent leakage of lubricating grease sealed in the bearing and intrusion of dust, muddy water, and the like from the outside into the bearing.

  On the outer peripheral surface of the hub wheel 5, the surface hardness ranges from 54 to 64 HRC from the seal land portion of the outboard side seal 11 serving as the base portion of the wheel mounting flange 5 a to the inner rolling surface 5 b and the small diameter step portion 5 c. A hardened layer 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 is unquenched with a surface hardness of 25 HRC or less, and is plastically deformed radially outward to form a crimped portion 5d. And the inner ring | wheel 6 externally fitted by the small diameter step part 5c of the hub ring 5 is being fixed to the axial direction by this crimping part 5d.

  In the present embodiment, a so-called self-retain structure is employed in which the internal clearance of the bearing is a negative clearance, the bearing rigidity is improved, and the inner ring 6 is fixed in the axial direction by the crimping portion 5d to maintain this preload amount. doing. 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 | bowl for the rolling element 9 was illustrated here, not only this but the double row tapered roller bearing using a tapered roller may be sufficient.

  FIG. 2 is a cross-sectional view taken along arrow A of FIG. 1, and a plurality of rectangular openings 12 are formed on the small-diameter step portion 5 c of the hub wheel 5 at equal intervals around the circumference. An opening 13 is also formed in the abutting portion 6 b of the inner ring 6 at a position corresponding to the opening 12 with the hub ring 5. Recesses 12a and 13a 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 a planetary speed reducer 2 to be described later is fixed. Element) 15 is rotatably supported.

  Both end portions of the carrier pin 14 are formed to have a two-sided width 14a, and are fitted to the recesses 12a and 13a and supported so as not to rotate. 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 8 c of the outer member 8 and the outer peripheral surface 17 a of the sun roller (input element) 17. In addition, although what illustrated the opening parts 12 and 13 in the butt | matching part 6b with the small diameter step part 5c of the hub ring 5 and the hub ring 5 of the inner ring | wheel 6 was illustrated here, not only this but not illustrated, A second generation structure in which a pair of inner rings are press-fitted into the small-diameter step portion of the hub ring may be applied. In this case, an opening is formed in the small-diameter step portion of the hub wheel, and an opening is formed in each of the abutting portions of the pair of inner rings positioned in the opening to support the planetary roller via the carrier pin. .

  As described above, the planetary speed reducer 2 includes the sun roller 17 connected to the end of the rotating shaft 3 on the outboard side so as to transmit torque, and the four planetary rollers 15 that perform planetary motion around the sun roller 17. And a carrier pin 14 that rotatably supports the planetary roller 15 with respect to the hub wheel 5 and the inner ring 6. The rotation of the rotary shaft 3 is transmitted to the planetary roller 15 through the sun roller 17, decelerated by the planetary roller 15, and transmitted to the wheel through the carrier pin 14 and the hub wheel 5. 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) 8 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 2 can be adjusted as appropriate by changing the ratio between the outer diameter of the planetary roller 15 and the inner diameter of the inner peripheral surface 8c of the outer member 8. For example, an electric motor for an electric vehicle is used. When applied to a wheel drive device, the reduction ratio can be set in the range of 3-9. Furthermore, if a reduction ratio of this level is obtained, it can be adequately dealt with by reducing the tip of the rotating shaft 3, that is, the outer diameter of the sun roller 17, and the reduction gear is accompanied by increasing the reduction ratio. Does not increase in size. Further, since the planetary roller 15 is disposed between the double-row outer rolling surfaces 8b, 8b formed on the inner periphery of the outer member 8 in the wheel bearing device 1, the planetary roller 15 and the sun roller 17 are moved to. Can be suppressed, and noise and vibration can be further suppressed. Further, uneven wear and the like of the planetary roller 15 and the sun roller 17 can be suppressed, and durability can be improved.

  In FIG. 1, the drive unit 4 is fixed to a stator housing 18 and is opposed to a stator 19 in which an electromagnetic coil 19b is wound around an iron core 19a (see FIG. 4), and the stator 19 is opposed to the stator 19 via a predetermined air gap. Then, the rotor 21 is fixed to one side of the rotating member 20 and is composed of a plurality of permanent magnets formed in a substantially fan shape (see FIG. 5), and the rolling member 20 rotatably supports the rotating member 20 with respect to the stator housing 18. And a bearing 23. When the electric motor 22 composed of the stator 19 and the rotor 21 is energized, the rotating member 20 rotates, and the rotation of the rotating member 20 is transmitted to the planetary speed reducer 2 via the rotating shaft 3.

  Here, a disc brake 24 is mounted on the outer peripheral portion of the rotating member 20. The disc brake 24 includes a brake pad 24a that holds the rotating member 20 from both sides, and a brake caliper 24b that presses the brake pad 24a via an actuator (not shown). In the present embodiment, since the rotating member 20 of the rotor 21 constituting the electric motor 22 is a brake rotor, the cost can be reduced by sharing parts. In addition, since the braking action can be applied by the disc brake 24 before decelerating by the planetary speed reducer 2, the braking torque can be reduced to provide a light and compact disc brake 24 in the radial direction, and parking. It can also function as a brake.

  Furthermore, in this embodiment, since the planetary roller 15 of the planetary reduction gear 2 is disposed between the outer rolling surfaces 8b, 8b of the outer member 8 constituting the wheel bearing device 1, the space of the bearing portion is reduced. Enough can be secured. Further, since the load can be equally applied to the moment load by the double row bearings, it is possible to suppress the biased load from acting on the planetary roller 15 and the sun roller 17 and to improve the durability. it can.

  FIG. 6 is a longitudinal sectional view showing a second embodiment of the electric wheel drive device according to the present invention. The second embodiment is different from the first embodiment (FIG. 1) 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 details thereof. The detailed explanation is omitted.

  As in the above-described embodiment, the drive unit 25 is fixed to the stator housing 18 and is opposed to the stator 19 in which the electromagnetic coil 19b is wound around the iron core 19a and the stator 19 through a predetermined air gap. A rotor 21 made of a plurality of permanent magnets fixed to one side of the rotating member 26 and formed in a substantially fan shape, and a rolling bearing 23 that rotatably supports the rotating member 20 with respect to the stator housing 18 are provided. . When the electric motor 22 composed of the stator 19 and the rotor 21 is energized, the rotating member 26 rotates, and the rotation of the rotating member 26 is transmitted to the planetary speed reducer 2 via the rotating shaft 3.

  Here, the rotating member 26 is formed with a cylindrical portion 26 a on the outer periphery, and shares a brake drum constituting the drum brake 27. A plurality of brake shoes 28 are arranged opposite to each other on the inner periphery of the cylindrical portion 26a. These brake shoes 28 are pressed against the cylindrical portion 26a via an actuator (not shown), and can be braked by the drum brake 27 before being decelerated by the planetary speed reducer 2, and also have a function as a parking brake. . Further, since the brake on the wheel side in the related art is disposed on the inboard side, the space around the wheel bearing device 1 can be secured, and the design flexibility in layout can be improved.

  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 first embodiment (FIG. 1) only in the configuration of the electric motor, and other parts having the same parts or the same functions are denoted by the same reference numerals. Detailed description thereof is omitted.

  The sun roller 17 constituting the planetary speed reducer 2 is connected to a rotating shaft 29 formed integrally with the rotating member 20 so that torque can be transmitted by press-fitting or serration fitting. The rotating shaft 29 is rotatably supported with respect to the stator housing 31 via a pair of rolling bearings 23, 23, and an electric motor 30 is mounted on the radially outer side thereof. The electric motor 30 has a stator 32 composed of an iron core 32a fixed to the stator housing 31 and an electromagnetic coil 32b wound around the iron core 32a, and is opposed to the stator 32 via a predetermined radial clearance. The inner rotor type electric motor 30 is configured by the rotor 33 disposed and fixed to the outer periphery of the rotary shaft 29.

  FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the electric wheel drive device according to the present invention. The fourth embodiment is different from the first embodiment (FIG. 1) only in the configuration of the electric motor, and other parts having the same parts or the same functions are denoted by the same reference numerals and details thereof. The detailed explanation is omitted.

  The rotating shaft 34 integrally includes a rotating member 35, and is rotatably supported via the rolling bearing 23 with respect to the stator housing 18. Further, the rotor 21 constituting the electric motor 36 is fixed to the outer periphery of the rotating member 35. A pair of stators 19, 19 are arranged to face each other via a predetermined axial clearance so as to sandwich the rotor 21, thereby constituting an electric motor 36. Thereby, the output of the electric motor 36 increases and the planetary reduction gear 2 can be reduced in weight and size.

  FIG. 9 is a longitudinal sectional view showing a fifth embodiment of the electric wheel drive device according to the present invention, and FIG. 10 is a sectional view taken along line XX of FIG. FIG. 11 shows a state when the brake is operated in FIG. The fifth embodiment is different from the above-described fourth embodiment (FIG. 8) only in the configuration of the brake part, and other parts having the same parts or the same functions are denoted by the same reference numerals and the details thereof. The detailed explanation is omitted.

  A cylindrical portion 38 is formed on the outer edge of the rotating member 37 integrally formed with the rotating shaft 34, and a plurality of concave portions 38 a are formed on the inner periphery of the cylindrical portion 38 at equal intervals. A plurality of through holes 39a are formed in the radially outer portion of the stator housing 39 corresponding to the recesses 38a, and the intermediate member 40 is accommodated in the through holes 39a. The intermediate member 40 is a substantially rectangular parallelepiped with a tip having a spire shape, and a bottom surface is formed on a tapered surface 40 a. The tapered surface 40 a is in sliding contact with the tapered surface 42 a of the cylindrical member 42. And as shown in FIG. 12, the front-end | tip part is immersed in the pocket 41a of the cyclic | annular spring member 41. As shown in FIG.

  9 and 10, an actuator 43 is disposed in the vicinity of the cylindrical member 42, and is supported so as to be swingable about a fulcrum 43a. One end of the actuator 43 abuts on the end surface of the cylindrical member 42, and the other end is engaged with the brake wire 44. When the brake wire 44 is actuated, the actuator 43 swings around the fulcrum 43a and displaces the cylindrical member 42 in the axial direction (left side in the figure). Due to the displacement of the cylindrical member 42, the intermediate member 40 starts to move radially outward, and the tip end portion thereof engages with the recess 38 a of the rotating member 37 as shown in FIG. 11. As a result, the rotating member 37 and the stator housing 39 are integrated with each other via the intermediate member 40, and the rotating member 37 is fixed to the stator housing 39. At this time, the pocket 41a of the annular spring member 41 is expanded with the movement of the intermediate member 40, and the column part 41b between the pockets 41a is elastically deformed. Thus, when the brake is released by applying the brake wire 44, the intermediate member 40 moves radially inward by the restoring force of the elastically deforming column portion 41b and returns to the original position. Therefore, the recess 38a of the rotating member 37 and the intermediate member 40 are disengaged, and the connection between the rotating member 37 and the stator housing 39 is released.

  As described above, the intermediate member 40 is stably held by the through hole 39a of the stator housing 39 and the annular spring member 41, and the intermediate member 40 is smoothly returned to the original state by the elastic force of the spring member 41. And can provide a stable and reliable braking action. Thus, by arranging the parking brake integrally with the rotating member 37 constituting the electric motor 36, the number of parts can be reduced and the cost can be reduced. Further, since the braking force is larger than that of a conventional parking brake by slipping, the weight and size of the brake unit can be reduced.

  FIG. 13 is a longitudinal sectional view showing a sixth embodiment of the electric wheel drive device according to the present invention, and FIG. 14 is a sectional view taken along line XIV-XIV in FIG. The sixth embodiment is different from the fifth embodiment (FIG. 9) only in the configuration of the brake part, and other parts having the same parts or the same functions are denoted by the same reference numerals and the details thereof are described. The detailed explanation is omitted.

  A cylindrical portion 46 is formed on the outer edge of the rotating member 45 formed integrally with the rotating shaft 34, and a tapered surface 46 a is formed on the inner periphery of the cylindrical portion 46. A ring-shaped intermediate member 48 is accommodated in the tapered surface 46 a, the outer peripheral surface of the stator housing 47 and the annular space via an elastic member 49. The intermediate member 48 has an outer periphery formed on a tapered surface 48a corresponding to the tapered surface 46a, and an inner periphery is serrated or the like, and is fitted to the stator housing 47 so as not to rotate and to be slidable in the axial direction. .

  On the other hand, as shown in FIG. 14, a plurality of concave portions 45 a are formed on the inner surface of the rotating member 45 at equal intervals around the circumference. A plurality of convex portions 48b are formed on the front end portion of the intermediate member 48 facing the concave portions 45a at an equal circumference.

  In FIG. 13, an actuator 43 is disposed in the vicinity of the intermediate member 48, and is supported so as to be swingable about a fulcrum 43a. One end of the actuator 43 abuts on the end surface of the intermediate member 48, and the other end is engaged with the brake wire 44. When the brake wire 44 is applied, the actuator 43 swings around the fulcrum 43a and displaces the intermediate member 48 in the axial direction (left side in the figure) against the elastic member 49. Due to the displacement of the intermediate member 48, the tapered surface 48a of the intermediate member 48 abuts with the tapered surface 46a of the rotating member 45, and finally the convex portion 48b engages with the concave portion 45a. As a result, the rotating member 45 and the stator housing 47 are integrated via the intermediate member 48, and the rotating member 45 is fixed to the stator housing 47. Further, when the brake is released by applying the brake wire 44, the intermediate member 48 moves in the axial direction (right side in the figure) by the restoring force of the elastic member 49 and returns to the original position. Accordingly, the engagement between the concave portion 45a of the rotating member 45 and the convex portion 48b of the intermediate member 48 is released, and the connection between the rotating member 45 and the stator housing 47 is released.

  In this way, the intermediate member 48 is engaged with and disengaged from the rotating member 45 by sliding and uneven engagement, so that the braking action can be exerted even if the rotating member 45 is not completely stopped, and the uneven engagement is also achieved. It has a large braking force and can work a stable and reliable braking action. And by integrating a parking brake with the rotating member 45 which comprises the electric motor 36, a number of parts can be reduced and cost can be reduced. In addition, although the ring-shaped intermediate member 48 is illustrated here, the present invention is not limited to this, and it may be divided into a plurality of segments.

  FIG. 15 is a longitudinal sectional view showing a seventh embodiment of the electric wheel drive device according to the present invention. The seventh embodiment is different from the fourth embodiment (FIG. 8) mainly in the configuration of the planetary speed reducer, and other parts having the same parts or functions have the same reference numerals. Detailed description is omitted.

  The wheel bearing device 50 is referred to as a third generation for supporting a driving wheel (not shown) as in the above-described embodiment. This wheel bearing device 50 integrally has a wheel mounting flange 5a for attaching a wheel to an end portion on the outboard side, and an inner rolling surface 5b is formed on the outer periphery. A hub wheel 51 formed with a cylindrical small-diameter step portion 5c extending to the side, an inner ring 6 press-fitted into the small-diameter step portion 51a of the hub wheel 51 and formed with an inner rolling surface 6a on the outer periphery, and a vehicle body on the outer periphery An outer member 52 integrally formed with a vehicle body mounting flange 8a for fixing to the inner surface, and formed with double-row outer rolling surfaces 8b, 8b facing the inner rolling surfaces 5b, 6a on the inner periphery, and A double row rolling element 9 accommodated so as to be freely rollable between both rolling surfaces, and a cage 10 for holding the rolling elements in a circumferentially equidistant manner are provided.

  The planetary speed reducer 53 includes a sun roller (input element) 17 connected to the tip of the rotating shaft 34 so as to transmit torque, and four planetary rollers (planetary elements) 54 that perform planetary movement around the sun roller 17. The planetary roller 54 includes a carrier pin (output element) 55 that rotatably supports the hub wheel 51 and the inner ring 6 via the rolling bearing 16. The carrier pin 55 is fitted in a recess 56 formed in the small-diameter step portion 51a of the hub wheel 51 and is supported so as not to rotate. The recess 56 into which the carrier pin 55 is fitted may be formed in the inner ring 6 that is press-fitted into the small diameter step portion 51a.

  The outer peripheral surface 54 a of the planetary roller 54 constituting the planetary speed reducer 53 rotates in contact with the inner peripheral surface 52 a on the inboard side of the outer member (fixed element) 52 and the outer peripheral surface 17 a of the sun roller 17. Here, when the electric motor 36 is energized, the rotor 21 rotates and the rotating shaft 34 integrally formed with the rotating member 35 rotates. The rotation of the rotary shaft 34 is transmitted to the planetary roller 54 via the sun roller 17, and the planetary roller 54 revolves around the sun roller 17, that is, the carrier pin 55 revolves to the wheel via the hub wheel 51. Decelerated and transmitted.

  Also in the present embodiment, as described above, the planetary roller 54 is incorporated in the outer member 52 constituting the wheel bearing device 50, so that a sufficient space for the bearing portion can be secured and the moment applied to the device. Since the load can be handled by the double-row bearing, it is possible to suppress the eccentric load from acting on the planetary roller 54 and the sun roller 17. Further, since the planetary roller 54 is disposed at the end of the outer member 52 on the inboard side, the assembly of the planetary speed reducer 53 can be simplified, and the length of the rotating shaft 34 can be shortened. The weight of the device can be reduced.

  FIG. 16 is a longitudinal sectional view showing an eighth embodiment of the electric wheel drive device according to the present invention. The eighth embodiment is a modification of the planetary speed reducer in the seventh embodiment (FIG. 15) described above, and other parts having the same parts or the same functions are denoted by the same reference numerals and the details thereof are described. The detailed explanation is omitted.

  The wheel bearing device 57 integrally has a wheel mounting flange 5a at an end on the outboard side, an inner rolling surface 5b is formed on the outer periphery, and a small diameter step portion extending from the inner rolling surface 5b to the inboard side. A hub wheel 58 formed with 58a, an inner ring 6 press-fitted into the small-diameter stepped portion 58a and formed with an inner rolling surface 6a on the outer periphery, and a vehicle body mounting flange 8a on the outer periphery, and the inner ring on the inner periphery. And an outer member 59 on which double-row outer rolling surfaces 8b and 8b facing the rolling surfaces 5b and 6a are formed.

  The planetary speed reducer 60 includes a sun roller (input element) 17 connected to the tip of the rotating shaft 34 so as to transmit torque, and four planetary rollers (fixed elements) 61 that perform planetary motion around the sun roller 17. A carrier pin (fixed element) 62 for rotatably supporting the planetary roller 61, and the carrier pin 62 are supported in a non-rotatable manner, and are relative to each other by press-fitting or serration fitting to the inboard side end portion of the outer member 59. And a disk-shaped fixing plate (fixing element) 63 that is non-rotatably fitted.

  The outer peripheral surface 61 a of the planetary roller 61 rotates in contact with the inner peripheral surface 58 b of the hub wheel (output element) 58 and the outer peripheral surface 17 a of the sun roller 17. Accordingly, when the electric motor 36 is energized, the rotor 21 rotates, and the rotation of the rotor 21 is transmitted to the planetary roller 61 via the sun roller 17. Then, the rotation of the planetary roller 61 is decelerated via the hub wheel 58 and transmitted to the wheels.

  In the present embodiment, since the fixed plate 63 constituting the planetary reduction gear 60 is incorporated in the end portion on the inboard side of the outer member 59 constituting the wheel bearing device 57, a sufficient space for the bearing portion can be secured. The assembly of the planetary speed reducer 60 becomes simple. Further, since the load can be handled by the double-row bearing even with respect to the moment load, it is possible to suppress the uneven load from acting on the planetary roller 61 and the sun roller 17. Furthermore, it is not necessary to form a recess in which the carrier pin 62 is fitted in the hub wheel 58 or the inner ring 6, and the number of processing steps and assembly steps can be reduced.

  FIG. 17 is a longitudinal sectional view showing a ninth embodiment of the electric wheel drive device according to the present invention. The ninth embodiment is different only in the configuration of the planetary speed reducer in the fourth embodiment (FIG. 8) described above, and other parts having the same parts or the same functions are denoted by the same reference numerals. Detailed description is omitted.

  The planetary speed reducer 64 includes a sun gear (input element) 65 coupled to the tip of the rotating shaft 34 so as to transmit torque, and four planetary gears (planetary elements) 66 that perform planetary movement around the sun gear 65. And a carrier pin (output element) 14 that rotatably supports the planetary gear 66 with respect to the hub wheel 5 and the inner ring 6. The outer teeth 66 a of the planetary gear 66 are engaged with the inner teeth 67 a formed on the inner peripheral surface of the outer member (fixed element) 67 and the outer teeth 65 a of the sun gear 65 and rotate.

  The rotation of the rotating shaft 34 is transmitted to the planetary gear 66 through the sun gear 65, and the rotation of the planetary gear 66 is decelerated through the hub wheel 5 and transmitted to the wheels. Therefore, as in the above-described embodiment, a sufficient space for the bearing portion can be secured, and even with respect to the moment load, the load can be handled by the double-row bearing, so that an eccentric load acts on the planetary gear 66 and the sun gear 65. Can be suppressed, the generation of meshing noise can be suppressed, and the durability can be improved. Moreover, since power transmission is performed by a gear transmission mechanism, power transmission can be performed efficiently without sliding contact. Further, the planetary speed reducer 64 can be lubricated with the lubricating grease sealed inside the bearing.

  FIG. 18 is a longitudinal sectional view showing a tenth embodiment of the electric wheel drive device according to the present invention. The tenth embodiment is different only in the configuration of the planetary speed reducer in the seventh embodiment (FIG. 15) described above, and other parts having the same parts or the same functions are denoted by the same reference numerals. Detailed description is omitted.

  The planetary speed reducer 68 includes a sun gear 65 coupled to the tip of the rotating shaft 34 so as to transmit torque, four planetary gears 69 moving around the sun gear 65, and the planetary gears 69 as hubs. A carrier pin 55 that rotatably supports the ring 51 and the inner ring 6 is provided. The outer teeth 69a of the planetary gear 69 rotate in mesh with the inner teeth 70a formed on the inner peripheral surface of the outer member 70 and the outer teeth 65a of the sun gear 65, respectively. Therefore, the rotation of the rotor 21 is transmitted to the rotating shaft 34 via the rotating member 35 and further transmitted to the planetary gear 69 via the sun gear 65. The rotation of the planetary gear 69 is decelerated via the hub wheel 51 and transmitted to the wheels.

  FIG. 19 is a longitudinal sectional view showing an eleventh embodiment of the electric wheel drive device according to the present invention. The eleventh embodiment is different only in the configuration of the planetary speed reducer in the eighth embodiment (FIG. 16) described above, and other parts having the same parts or the same functions are denoted by the same reference numerals. Detailed description is omitted.

  The planetary speed reducer 71 includes a sun gear (input element) 72 connected to the tip of the rotating shaft 34 so as to transmit torque, and four planetary gears (fixed elements) 73 that perform planetary motion around the sun gear 72. And a carrier pin (fixed element) 62 that supports these planetary gears 73 in a rotatable manner, and supports the carrier pin 62 in a non-rotatable manner and is fitted in an end on the inboard side of the outer member 59 so as not to be relatively rotatable. The disc-shaped fixed plate (planetary element) 63 is provided.

  The outer teeth 73 a of the planetary gear 73 mesh with the inner teeth 74 a formed on the inner peripheral surface of the hub wheel (output element) 74 and the outer teeth 72 a of the sun gear 72, respectively. Therefore, the rotation of the rotor 21 is transmitted to the rotating shaft 34 via the rotating member 35 and further transmitted to the planetary gear 73 via the sun gear 72. The rotation of the planetary gear 73 is decelerated via the hub wheel 74 and transmitted to the wheels.

  FIG. 20 is a longitudinal sectional view showing a twelfth embodiment of the electric wheel drive device according to the present invention. The twelfth embodiment is different only in the configuration of the drive unit in the fourth embodiment (FIG. 8) described above, and other parts having the same parts or the same functions are denoted by the same reference numerals and the details thereof are described. The detailed explanation is omitted.

  The drive unit 75 is fixed to the stator housing 18 and is opposed to a pair of stators 19 and 19 in which an electromagnetic coil 19b is wound around an iron core 19a. The drive unit 75 is opposed to the stator 19 via a predetermined air gap. The rotor 21 is composed of a plurality of permanent magnets fixed to one side, and a rolling bearing 23 that rotatably supports the rotating member 76 with respect to the stator housing 18. When the electric motor 36 composed of the stator 19 and the rotor 21 is energized, the rotating member 76 rotates, and the rotation of the rotating member 76 is transmitted to the planetary speed reducer 2 via the rotating shaft 34.

  Here, a cooling fin 77 is integrally formed in the vicinity of the disc brake 24 of the rotating member 76. With the rotation of the rotating member 76, the cooling fins 77 rotate, and the disk brake 24 can be cooled by the heat dissipation effect to suppress the temperature rise. This prevents heat from the disc brake 24 from being transmitted to the electric motor 36 via the rotating member 76.

  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 arrow directional view which carried out the cross section of FIG. It is a cross-sectional view along the III-III line of FIG. FIG. 4 is a cross-sectional arrow view taken along line IV-IV in FIG. 1. It is a cross-sectional arrow 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. FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. It is sectional drawing which showed the state at the time of a brake action same as the above. It is a principal part perspective view of a brake part same as the above. 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 cross-sectional arrow view along the XIV-XIV line of FIG. 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 9th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 10th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 11th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 12th 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, 50, 57... Wheel bearing device 2, 53, 60, 64, 68, 71... Planetary reducer 3, 29, 34. ············································ 5・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 5b, 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Inner rolling surfaces 5c, 51a, 58a ... Small diameter step 5d ... Caulking Part 6 ... Inner ring 7 ... Inner member 8 , 52, 59, 67, 70 ... Outer member 8a ... ... Car body mounting flange 8b ......... Outer rolling surface 9 ... ... Rolling elements 10 ... Cage 11 ... Seal 12, 13 ... Opening 12a, 13a ... Recess 14, 55, 62 ... ··············· Carrier pin 14a ··················· Width across flats 15, 54, 61 ... Planetary rollers 16, 23 ... Rolling bearings 17 ... Sun rollers 17a, 54a, 61a ... outer peripheral surfaces 18, 31, 39, 47 ... Stator housing 19, 32 ... Stator 19a, 32a ...・ Iron cores 19b, 32b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electromagnetic coils 20, 26, 35, 37, 45, 76 ・ ・ ・ Rotating members 21, 33 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotor 22, 30, 36 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electric motor 24 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Brake brake 24a ... Brake pad 24b ... Brake caliper 26a , 38, 46 ......... Cylinder 27 ...・ ・ ・ ・ ・ ・ ・Brake shoes 38a, 45a ... Recess 39a ... Through hole 40 , 48 ..... Intermediate members 40a, 42a, 46a, 48a ... Tapered surface 41 ... ... Spring member 41a ... Pocket 41b ...・ Pillar part 42 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical member 43 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Actuator 43a ・............ fulcrum 44 ......... brake wire 48b ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Convex 49 ・ ・ ・ ・ ・ ・ ・ ・..... Elastic members 8c, 52a, 58b ..... Inner peripheral surface 56 ... ··· Recess 63 ················ Fixed plate 65, 72 Gears 65a, 66a, 69a, 72a, 73a ... External teeth 66, 69, 73 ... Planetary gears 67a, 70a, 74a ...・ ・ Inner teeth 77 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cooling fins 101 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electric wheel Driving device 102 ... Tire 103 ... Wheel 104 ... .... Electric motor 105 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gear reducer 105a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ First gear 105b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・2nd gear 105c ... 3rd gear 105d ... ... Fourth gear 106 ... Cases 106a, 110a, 111a ... Recess 106b ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Through hole 107 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stator 108・ ・ ・ ・ Rotor 109 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Output shaft 109a, 116a ・ ・ ・ ・ ・ ・ ・ ・ One end 109b, 116b ..... other ends 110, 111・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cover 110b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Recess 112・ ・ ・ ・ ・ Mounting flange 113 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolts 114, 115, 117, 118 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling bearing 116 ・ ・ ・ ・ ・ ・ ・ ・..... Support shaft

Claims (14)

A wheel bearing device having a double-row bearing, a planetary speed reducer mounted on the wheel bearing device, a rotating member integrally having a rotating shaft of the planetary speed reducer, and an integrally fixed to the rotating member A drive unit composed of an electric motor having a rotor and a stator disposed opposite to the rotor via a predetermined gap;
The electric motor is characterized in that the rotation of the electric motor is decelerated by the planetary speed reducer to transmit power to a hub wheel constituting the wheel bearing device, and a braking device is integrally mounted on the rotating member. Type wheel drive device. The wheel bearing device includes a hub ring having a wheel mounting flange at one end, an inner ring press-fitted into the hub ring, and formed with at least one inner rolling surface among double row inner rolling surfaces on an outer periphery. 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 between the two rolling surfaces so as to roll freely. ,
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 includes a stator housing that is fixed to the vehicle body and includes a stator, and a rotating member that is rotatably supported with respect to the stator housing. The rotating member is coupled to the input element so as to transmit torque. The electric wheel drive device according to claim 1, wherein the rotation of the electric motor is transmitted to the hub wheel via the planetary speed reducer to drive the wheel. The wheel bearing device includes a hub ring having a wheel mounting flange at one end, an inner ring press-fitted into the hub ring, and formed with at least one inner rolling surface among double row inner rolling surfaces on an outer periphery. 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 between the two rolling surfaces so as to roll freely. ,
The planetary speed reducer is rotatably supported with respect to 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 the fixed element. The input element and a plurality of fixing elements engaged with the hub wheel,
The drive unit includes a stator housing that is fixed to the vehicle body and includes a stator, and a rotating member that is rotatably supported with respect to the stator housing. The rotating member is coupled to the input element so as to transmit torque. The electric wheel drive device according to claim 1, wherein the rotation of the electric motor is transmitted to the hub wheel via the planetary speed reducer to drive the wheel.   The electric wheel drive device according to any one of claims 1 to 3, wherein the braking device is a parking brake.   5. The electric wheel drive according to claim 4, wherein the parking brake includes an intermediate member that is held in the stator housing so as to be able to transmit torque, and an actuator that displaces the intermediate member and engages the rotating member. apparatus.   A plurality of recesses are formed in a radially outer portion of the rotating member, a plurality of through holes are formed in the radially outer portion of the stator housing corresponding to the recesses, and a tapered surface is formed in the through holes. The electric wheel drive device according to claim 5, wherein the intermediate member is accommodated, and the intermediate member is displaced through a cylindrical member engaged with the tapered surface to be engaged with the recess.   A plurality of concave portions and a tapered surface are formed in a radially outer portion of the rotating member, and a convex portion and a tapered surface that engage with the concave portion and the tapered surface are formed on the intermediate member, and the intermediate member is the stator. 6. The electric wheel drive device according to claim 5, wherein the electric wheel drive device is held so as to be capable of transmitting torque to the housing and capable of axial displacement.   The electric wheel drive device according to any one of claims 2 to 7, wherein the planetary element is disposed between double row outer rolling surfaces formed on an inner periphery of the outer member.   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 1 to 8, wherein a carrier pin serving as an output element of the planetary reduction gear is fixed in a 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 9. The electric wheel drive device according to any one of Items 1 to 8.   The electric wheel drive device according to claim 9 or 10, wherein a two-sided width is formed on the carrier pin, and the two-sided width is fitted in the recess.   The electric wheel drive device according to any one of claims 1 to 11, wherein a pair of stators are disposed in a state of being sandwiched via a predetermined axial clearance with respect to a rotor of the electric motor.   The electric wheel drive device according to any one of claims 1 to 12, wherein each element of the planetary reduction gear is transmitted with power by friction means.   The electric wheel drive device according to any one of claims 1 to 12, wherein each element of the planetary reduction gear is transmitted with power by gear means.

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