JP2005218245A - Electromotive wheel driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromotive wheel driver in which the traveling performance of a vehicle is enhanced by enhancing the durability of a bearing for a wheel and making a device lightweight and compact. <P>SOLUTION: A motor M is arranged between a plurality of rows of bearings in a bearing unit 2 for a wheel, and two epicycle reduction gears 3 and 3' fixed to the bearing unit 2 for the wheel comprise sun rollers 17 and 17' secured to a rotary shaft 4 and a coupling shaft 6, respectively, a plurality of planet rollers 15 and 15' arranged between these sun rollers 17, 17' and an outer member 9, and carrier pins 14 and 14' for bearing these planet rollers 15 and 15' rotatably. A drive section 5 comprises a motor M composed of a stator section 18 and a rotor section 22 arranged integrally on the outer member 9, and a rotary member 24 supported rotatably by the outer member 9 and having the rotary shaft 4 integrally and transmits the rotation of the motor M to a hub ring 7 through the first and second epicycle reduction gears 3 and 3'. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric wheel drive device that is used in a vehicle such as an electric vehicle, a golf cart, or a forklift, and in which a wheel bearing device 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. 9 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 such an object, the invention according to claim 1 of the present invention includes a wheel bearing device having a double row bearing, and a second bearing device mounted on the wheel bearing device and connected via a connecting shaft. 1 and a second planetary speed reducer, and a drive unit having an electric motor for driving the first planetary speed reducer, and the rotation of the electric motor is controlled by the first planetary speed reducer and the second planetary speed reducer. The power is transmitted to the hub wheel constituting the wheel bearing device by being decelerated in two stages by a machine, and the stator portion constituting the electric motor is integrally disposed on the outer member of the wheel bearing device. The configuration is adopted.

  In this way, the rotation of the electric motor is decelerated in two stages by the first planetary speed reducer and the second planetary speed reducer, and the power is transmitted to the hub wheel constituting the wheel bearing device and the electric motor is configured. Because the stator part to be mounted is integrated 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, resulting in 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 is a wheel bearing device, the first and second planetary speed reducers mounted on the wheel bearing device and connected via a connecting shaft, A drive unit having an electric motor for driving the first planetary speed reducer, and the wheel bearing device has a hub wheel having a wheel mounting flange at one end, and is externally fitted to the hub wheel and double-rowed on the outer periphery. An inner ring formed with at least one inner rolling surface of the inner rolling surfaces, an outer member formed with a double row outer rolling surface facing the inner rolling surface on the inner periphery, and both The first planetary speed reducer includes an input element coupled to a rotation shaft so as not to rotate relative to a rotation shaft, and an inner member of the outer member. A fixed element disposed on the circumferential side, and a plurality of planetary elements disposed between the fixed element and the input element; An output element that rotatably supports these planetary elements with respect to the connecting shaft, and the second planetary speed reducer includes an input element that is connected to the connecting shaft so as not to rotate relatively, and an inner member of the outer member. A fixing element disposed on the circumferential side, a plurality of planetary elements disposed between the fixing element and the input element, 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 fixedly supported and rotatably supported with respect to the outer member, and that integrally has the rotating shaft, and rotates the electric motor via the first and second planetary reducers. The wheel is transmitted to the hub wheel. It was.

  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. Since the air gap between the rotor and the rotor portion does not change, the efficiency of the electric motor is improved.

  Further, in the invention according to claim 4, since the planetary element of the second planetary speed reducer is disposed between the double row outer rolling surfaces formed on the inner periphery of the outer member, Uneven load on the planetary element can be suppressed, and uneven wear of the planetary element can be suppressed.

  The invention according to claim 5 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 second planetary speed reducer is fixed to the recess, and the planetary element is rotatably supported on the carrier pin. Space can be secured sufficiently, and the durability of the bearing portion can be improved against moment load, and the device can be further reduced in weight and size.

  Preferably, as in the invention described in claim 6, the carrier pin is formed with a two-sided width, and if the two-sided width is fitted into the recess, the carrier pin is reliably secured with a simple configuration. It can be fixed to the wheel, and the planetary speed reducer can be easily assembled.

  Further, as in the seventh aspect of the present invention, if 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.

  Further, as in the eighth aspect of the invention, if each element of the planetary speed reducer is transmitted with power by gear means, 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, and first and second planetary reduction gears mounted on the wheel bearing device and connected via a connecting shaft. And a drive unit having an electric motor for driving the first planetary speed reducer, and the rotation of the electric motor is decelerated in two stages by the first planetary speed reducer and the second planetary speed reducer. Power is transmitted to the hub wheel constituting the wheel bearing device, and the stator part constituting the electric motor is integrally disposed on the outer member of the wheel bearing device, so that the entire device is lightweight and compact. The ride comfort and running stability can be improved by reducing the unsprung weight of the vehicle. 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, first and second planetary reducers attached to the wheel bearing device and connected via a connecting shaft, and the first A drive unit having an electric motor for driving the planetary speed reducer, and the wheel bearing device includes a hub wheel having a wheel mounting flange at one end and an outer fit on the hub wheel, and a double row inner side on the outer periphery. An inner ring in which at least one inner rolling surface of the rolling surfaces is formed, an outer member in which a double row outer rolling surface facing the inner rolling surface is formed on the inner periphery, and both the rolling members The first planetary speed reducer includes an input element coupled to a rotation shaft so as not to be relatively rotatable, and an inner peripheral side of the outer member. And a plurality of planetary elements disposed between the fixed element and the input element, An output element that rotatably supports these planetary elements with respect to a connecting shaft, and the second planetary speed reducer includes an input element that is connected to the connecting shaft so as not to rotate relative to the connecting shaft; A fixed element disposed on the inner peripheral side, a plurality of planetary elements disposed between the fixed element and the input element, and an output element that rotatably supports 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 And a rotating member that is rotatably supported with respect to the outer member and integrally has the rotating shaft, and rotates the electric motor via the first and second planetary speed reducers. To transmit to the hub wheel to drive the wheel Since the, it is possible to sufficiently secure a space of the bearing portion, to increase the support strength of the bearing portion can also improving the durability against a moment load, and it is possible to reduce the weight and size of the entire apparatus.

  Wheel bearing device, first and second planetary reduction gears mounted on the wheel bearing device and connected via a connecting shaft, and a drive unit having an electric motor for driving the first planetary reduction gear The wheel bearing device has a wheel mounting flange at one end, and extends in the axial direction from one inner rolling surface of the double row inner rolling surfaces on the outer periphery and the inner rolling surface. A hub ring formed with a cylindrical small-diameter step portion, an inner ring that is externally fitted to the small-diameter step portion of the hub ring, and the other inner rolling surface is formed on the outer periphery of the double-row inner rolling surface; 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 the rolling surfaces; An end portion of the small diameter step portion is plastically deformed radially outward to form a caulking portion, and the inner ring is moved against the hub wheel by the caulking portion. The first planetary speed reducer is fixed in a direction, and the first planetary speed reducer includes a sun roller coupled to a rotation shaft so as not to rotate relatively, and a plurality of planetary rollers disposed between the outer member and the sun roller. And a carrier pin that rotatably supports these planetary rollers with respect to the connecting shaft, and the second planetary speed reducer includes a sun roller connected to the connecting shaft so as not to rotate relative to the connecting shaft, and the outer member. A plurality of planetary rollers disposed between the sun rollers and carrier pins for rotatably supporting the planetary rollers with respect to the hub wheel; and the drive unit is disposed integrally with the outer member. An electric motor comprising a stator portion provided and a rotor portion opposed to the stator portion via a predetermined air gap; and the rotor portion is fixed and supported rotatably with respect to the outer member. , Said times A rotating member integrally having a shaft, and the electric motor is disposed between the rolling surfaces of the double row, and the rotation of the electric motor is transmitted through the first and second planetary speed reducers. 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 view taken along an arrow A in FIG. 1, and FIG. 3 is a line III-III in FIG. FIG.

  The electric wheel drive device 1 includes a wheel bearing device 2, first and second planetary speed reducers 3, 3 ′ mounted on the wheel bearing device 2, and the first planetary speed reducer 3. The drive part 5 which has the rotating shaft 4 integrally is made into the 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 7e for mounting a wheel at an end portion on the outboard side, and an inner rolling surface 7a is formed on the outer periphery. 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 in a freely rolling manner between both rolling surfaces, and a cage 11 for holding the rolling elements 10 in a circumferentially equidistant manner 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.

  A hardened layer is provided on the outer peripheral surface of the hub wheel 7 so that the surface hardness ranges from 54 to 64 HRC from the inner rolling surface 7a to the small-diameter stepped portion 7b, including the seal land portion serving as the base of the wheel mounting flange 7e. 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 view taken along arrow A in 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 circumferential center portions of the openings 12 and 13, and a carrier pin (output element) 14 'of a second planetary speed reducer 3' to be described later is fixed, as shown in FIG. As described above, the planetary roller (planetary 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 a 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 9e of the outer member (fixing element) 9 and the outer peripheral surface 17a' 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, a first planetary speed reducer 3 includes a sun roller (input element) 17 that is connected to the end of the rotating shaft 4 on the outboard side so as not to be relatively rotated, such as press-fitting or serration fitting, and the sun roller. Four planetary rollers (planetary elements) 15 that planetarily move around 17 and carrier pins (output elements) 14 that rotatably support the planetary rollers 15 with respect to the connecting shaft 6 are provided. A plurality of carrier pins 14 project from the outer peripheral portion of the connecting shaft 6 and are supported so as not to rotate.

  The planetary roller 15 constituting the first planetary speed reducer 3 is rotatably supported with respect to the carrier pin 14 via a bearing (not shown). The planetary roller 15 rotates in contact with the inner peripheral surface 9d on the inboard side of the outer member 9 and the outer peripheral surface 17a of the sun roller 17, respectively. 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, decelerated and transmitted to the connecting shaft 6 via the carrier pin 14.

  On the other hand, the second planetary speed reducer 3 ′ includes a sun roller 17 ′ connected to the end of the connecting shaft 6 on the outboard side so as not to be relatively rotatable, such as press-fitting or serration fitting, and the sun roller 17 ′. 4 planetary rollers 15 ′ and a carrier pin 14 ′ that rotatably supports the planetary rollers 15 ′ with respect to the hub wheel 7 and the inner ring 8. The planetary roller 15 ′ rotates while rotating in contact with the inner circumferential surface 9 e between the double row outer rolling surfaces 9 a, 9 a of the outer member 9 and the outer circumferential surface 17 a ′ of the sun roller 17.

  The rotation of the connecting shaft 6 is transmitted to the planetary roller 15 ′ through the sun roller 17 ′, and the rotation of the planetary roller 15 ′ is further decelerated through the hub wheel (carrier) 7 and transmitted to the wheels. Therefore, since the power transmission between the sun rollers 17 and 17 ′ and the planetary rollers 15 and 15 ′ and the planetary roller 15 and the outer member 9 is performed by friction transmission (traction drive), noise and vibration generated during power transmission. Can be suppressed as much as possible.

  The respective reduction ratios of the first and second planetary speed reducers 3 and 3 ′ can be appropriately adjusted by changing the ratio of the outer diameter of the planetary rollers 15 and 15 ′ to the inner diameter of the outer member 9. For example, when applied to an electric wheel drive device for an electric vehicle, the reduction ratio can be set in the range of 3-9. The overall reduction ratio is the product of the reduction ratio m of the first planetary reduction gear 3 and the reduction ratio n of the second planetary reduction gear 3 ′, that is, m × n. Therefore, an extremely large reduction ratio can be obtained in a small space, and the electric motor M described later can be reduced in weight and size. Further, since the planetary rollers 15 and 15 ′ are disposed in the vicinity of the double row bearings in the wheel bearing device 2, the planetary rollers 15 and 15 ′ and the sun rollers 17 and 17 ′ are biased with respect to the moment load. It can suppress that a load acts. In addition, this can suppress uneven wear of the planetary rollers 15 and 15 'and the sun rollers 17 and 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. . Moreover, the rotor magnet 23 is formed in a substantially sector shape, and is composed of a permanent magnet.

  The rotating member 24 is formed in a cup shape as shown in FIG. 1, and the rotating shaft 4 protrudes from the center of the bottom portion. The rotating member 24 is rotatably supported by the outer member 9 via a rolling bearing 25. Has been. 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 first planetary speed reducer 3 via the rotating shaft 4. The Then, the first planetary reduction gear 3 decelerates at a predetermined reduction ratio m and is transmitted to the second planetary reduction gear 3 ′ via the connecting shaft 6. Further, the rotation of the rotating member 24 is decelerated at a predetermined reduction ratio n by the second planetary reduction gear 3 ′ and transmitted to the wheels via the hub wheel 7.

  In the present embodiment, the planetary rollers 15 and 15 ′ constituting the first and second planetary speed reducers 3 and 3 ′ are respectively incorporated in the outer member 9 constituting the wheel bearing device 2 and therefore the bearing portion. Can be secured sufficiently, and since the electric motor M is disposed between the double row bearings, the stator portion 18 and the rotor are stable without being affected by the elastic deformation of the bearing portion. The air gap with the part 22 does not change. Therefore, the efficiency of the electric motor M is improved. 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 device can be made compact in the axial direction, and the unsprung weight of the vehicle can be reduced. Riding comfort and running stability can be improved. Moreover, 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 embodiment differs from the first embodiment described above 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 first planetary speed reducer 26 includes a sun gear (input element) 27 that is coupled to the rotation shaft 4 so as not to rotate relative to the rotation shaft 4, and four planetary gears (planetary elements) 28 that perform planetary movement around the sun gear 27. The planetary gear 28 includes a carrier pin (output element) 14 that rotatably supports the connecting shaft 6. The planetary gear 28 constituting the first planetary speed reducer 26 is rotatably supported with respect to the carrier pin 14 via a bearing (not shown). The planetary gear 28 meshes with the inner teeth 9 f formed on the inner peripheral surface of the outer member (fixed element) 29 and the outer teeth 27 a of the sun gear 27 and rotates. The rotation of the rotating shaft 4 is transmitted to the planetary gear 28 via the sun gear 27, and the planetary gear 28 revolves, that is, decelerated and transmitted to the connecting shaft 6 via the carrier pin 14.

  On the other hand, the second planetary speed reducer 26 ′ includes a sun gear 27 ′ connected to the connecting shaft 6 so as not to rotate relative to the connecting shaft 6, four planetary gears 28 ′ moving around the sun gear 17 ′, A carrier pin 14 'for rotatably supporting the planetary gear 28' with respect to the hub wheel 7 and the inner ring 8 is provided. These planetary gears 28 'are meshed with the inner teeth 9g between the double row outer rolling surfaces 9a, 9a formed on the inner peripheral surface of the outer member 29 and the outer teeth 27a' of the sun gear 27 '. To do.

  The rotation of the connecting shaft 6 is transmitted to the planetary gear 28 ′ via the sun gear 27 ′, and the rotation of the planetary gear 28 ′ is further decelerated via the hub wheel (carrier) 7 and transmitted to the wheels. Therefore, since the power transmission between the sun gears 27 and 27 ′ and the planetary gears 28 and 28 ′ and the planetary gears 28 and 28 ′ and the outer member (fixed element) 29 is performed by the gear transmission mechanism, sliding contact is involved. Power can be transmitted efficiently.

  FIG. 7 is a longitudinal sectional view showing a third 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 first embodiment (FIG. 1) described above, and the same parts and parts having the same functions or parts having the same functions are denoted by the same reference numerals and detailed description thereof. Is omitted.

  The wheel bearing device 30 integrally has a wheel mounting flange 7e for attaching a wheel to an end portion 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 31 having a vehicle body mounting flange 31a integrally formed therein, and formed with double row outer rolling surfaces 9a, 9a opposed to the inner rolling surfaces 7a, 8a on the inner periphery, and both the rolling members A double row rolling element 10 accommodated so as to be freely rollable between the surfaces and a cage 11 for holding the rolling elements 10 at equal circumferences are provided.

  The drive unit includes a stator portion 32 fixed to the outer peripheral surface of the outer member 31, a rotor portion 33 disposed opposite to the stator portion 32 via a predetermined radial clearance, and the rotor portion 33. The rotating member 34 is fixed. The stator portion 32 includes a stator iron core 35 and a stator coil 36 wound around the stator iron core 35. On the other hand, the rotor portion 33 is composed of a rotor magnet 37 made of a permanent magnet, and the rotor portion 33 and the stator portion 32 constitute an outer rotor type electric motor M.

  The rotating member 34 is formed in a cup shape, and the rotating shaft 4 protrudes from the center portion, and the rotor portion 33 is fixed to a cylindrical inner peripheral surface. The rotating member 34 is rotatably supported with respect to the outer member 31 via the rolling bearing 25. When the electric motor M is energized, the rotating member 34 rotates, and the rotation of the rotating member 34 is transmitted to the first planetary speed reducer 3 via the rotating shaft 4. Then, the first planetary reduction gear 3 decelerates at a predetermined reduction ratio and is transmitted to the second planetary reduction gear 3 ′ via the connecting shaft 6. Further, the rotation of the rotating member 34 is decelerated at a predetermined reduction ratio by the second planetary reduction gear 3 ′ and transmitted to the wheels via the hub wheel 7. Although the outer rotor type electric motor M is illustrated here, it is needless to say that an inner rotor type electric motor in which the stator portion 32 is disposed radially outward of the rotor portion 33 may be used.

  FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the electric wheel drive device according to the present invention. This embodiment is different from the above-described third embodiment (FIG. 7) 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 first planetary speed reducer 26 includes a sun gear (input element) 27 that is coupled to the rotation shaft 4 so as not to rotate relative to the rotation shaft 4, and four planetary gears (planetary elements) 28 that perform planetary movement around the sun gear 27. The planetary gear 28 includes a carrier pin (output element) 14 that rotatably supports the connecting shaft 6. The planetary gear 28 constituting the first planetary speed reducer 26 is rotatably supported with respect to the carrier pin 14 via a bearing (not shown). The planetary gear 28 rotates by meshing with the inner teeth 9 f formed on the inner peripheral surface of the outer member (fixed element) 38 on the inboard side and the outer teeth 27 a of the sun gear 27. The rotation of the rotating shaft 4 is transmitted to the planetary gear 28 via the sun gear 27, and the planetary gear 28 revolves, that is, decelerated and transmitted to the connecting shaft 6 via the carrier pin 14.

  On the other hand, the second planetary speed reducer 26 ′ includes a sun gear 27 ′ connected to the connecting shaft 6 so as not to rotate relative to the connecting shaft 6, four planetary gears 28 ′ moving around the sun gear 17 ′, A carrier pin 14 'for rotatably supporting the planetary gear 28' with respect to the hub wheel 7 and the inner ring 8 is provided. The planetary gear 28 'meshes with the outer teeth 27a' of the sun gear 27 'and the inner teeth 9g between the double row outer rolling surfaces 9a, 9a formed on the inner peripheral surface of the outer member (fixed element) 38. Then rotate.

  The rotation of the connecting shaft 6 is transmitted to the planetary gear 28 ′ via the sun gear 27 ′, and the rotation of the planetary gear 28 ′ is further decelerated via the hub wheel (carrier) 7 and transmitted to the wheels. Therefore, since the power transmission between the sun gears 27 and 27 ′ and the planetary gears 28 and 28 ′ and the planetary gears 28 and 28 ′ and the outer member 38 is performed by the gear transmission mechanism, it is efficiently performed without sliding contact. Power transmission is possible.

  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 principal part A arrow 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 the conventional electric wheel drive device.

Explanation of symbols

1... Electric wheel drive device 2, 30... Wheel bearing device 3, 3 ′, 26 , 26 '... Planetary reducer 4 ... Rotary shaft 5 ... ..Drive unit 6 ... Connecting shaft 7 ... Hub wheels 7a, 8a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 7b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 7c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・· Clamping parts 7d, 8b .... Butting part 7e ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 9, 29, 31, 38 ・ ・ ・ ・ ・ ・ ・ ・ Outer member 9a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Side rolling surfaces 9b, 31a ... Car body mounting flange 9c ... Seals 9d, 9e ...・ ・ ・ ・ ・ ・ Inner peripheral surface 9f, 9g ・ ・ ・ ・ ・ ・ ・ ・ Internal tooth 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 11 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Retainer 12, 13, 13a ・ ・ ・ ・ ・ ・ ・ ・ ・ Openings 12a, 13b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Recesses 14, 14 '············· Carrier pin 14a ·········· Width across flats 15 and 15' Planetary rollers 16, 25 ... Rolling bearings 17, 17 '... Sun rollers 17a, 17a' ... ..Outer peripheral surfaces 18, 32 ......... Stator portion 19 ····························· 20 Stator coils 22 and 33 ... rotor parts 23 and 37 ... rotor magnets 24 and 34 ...・ ・ ・ ・ Rotating members 27 and 27 ′ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sun gear 27a, 27a ′ ・ ・ ・ ・ ・ External teeth 28 and 28 ′ ・ ・ ・ ・ ・ ・... Planetary gear 51 ... Electric wheel drive device 52 ... Tire 53 Wheel 54 ... Electric motor 55 ... .... Gear reducer 55a ... 1st gear 5 5b ... 2nd gear 55c ... 3rd gear 55d ... · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Through hole 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stator 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotor 59 ・ ・ ・ ・..... output shaft 59a, 66a ......... one end 59b, 66b ......... other end 60, 61 ... Cover 60b ... Recess 62 ... Mounting flange 63 ... Hub bolts 64, 65, 67, 8. Rolling bearing 66 ... Support shaft M ... Electric motor m , N ... Reduction ratio

Claims (8)

  A wheel bearing device having a double row bearing, first and second planetary reducers mounted on the wheel bearing device and connected via a connecting shaft, and driving the first planetary reducer A drive unit having an electric motor, and the rotation of the electric motor is decelerated in two stages by the first planetary speed reducer and the second planetary speed reducer to drive the hub wheel constituting the wheel bearing device. And a stator portion constituting the electric motor is integrally disposed on an outer member of the wheel bearing device. Wheel bearing device, first and second planetary reduction gears mounted on the wheel bearing device and connected via a connecting shaft, and a drive unit having an electric motor for driving the first planetary reduction gear And
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 first planetary speed reducer includes an input element that is connected to a rotation shaft so as not to rotate relative thereto, a fixed element that is disposed on an inner peripheral side of the outer member, and a gap between the fixed element and the input element. A plurality of arranged planetary elements and an output element that rotatably supports these planetary elements with respect to the connecting shaft;
The second planetary speed reducer includes an input element coupled to the coupling shaft so as not to rotate relative thereto, a fixed element disposed on an inner peripheral side of the outer member, and between the fixed element and the input element. A plurality of planetary elements disposed on the output wheel and an output element that rotatably supports the planetary elements 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. And a rotating member that is rotatably supported with respect to the outer member and integrally has the rotating shaft, and the rotation of the electric motor is transmitted via the first and second planetary speed reducers. An electric wheel driving device characterized in that the wheel is driven by transmitting to a 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 according to any one of claims 1 to 3, wherein the planetary element of the second planetary speed reducer is disposed between double row outer rolling surfaces formed on an inner periphery of the outer member. Drive device.   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 4, wherein a carrier pin serving as an output element of the second planetary speed reducer is fixed in the recess, and the planetary element is rotatably supported by the carrier pin. .   The electric wheel drive device according to claim 5, wherein the carrier pin has a two-sided width, and the two-sided width is fitted in the recess.   The electric wheel drive device according to any one of claims 1 to 6, wherein each element of the planetary reduction gear is powered by friction.   The electric wheel drive device according to any one of claims 1 to 6, wherein each element of the planetary reduction gear is transmitted with power by gear means.

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