JP2005212657A - 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, decreasing the weight/size of the device, and taking a disassembling/assembling property into account. <P>SOLUTION: An electric motor M is arranged between a plurality of bearings of the wheel bearing device 2. Two planetary speed reducers 3, 3' installed to the wheel bearing device 2 comprise sun gears 17, 17' respectively fixed to a rotating shaft 4 and a coupling shaft 6; a plurality of planetary gears 15, 15' arranged between these solar gears 17, 17' and an outward member 9; and carrier pins 14, 14' rotatably supporting the planetary gears 15, 15'. A driving portion 5 comprises a stator housing 19 separatably fastened to the outward member 9, the electric motor M composed of a stator portion 18 included in the stator housing 19 and a roller portion 22, and a rotating member 24 rotatably supported to the outward member 9 and integrally having a rotating shaft 4. Rotation of the electric motor M is transmitted to a hub ring 7 through the first and second planetary speed reducers 3, 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. 15 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.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric wheel drive device that solves these conventional problems, improves durability of wheel bearings, reduces the weight and size of the device, and considers disassembly and assembly. .

  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 motor is decelerated in two stages, transmits power to the hub wheel constituting the wheel bearing device, and the electric motor is integrally disposed on the outer member of the wheel bearing device so as to be separable. Adopted.

  Thus, the rotation of the electric motor is decelerated in two stages by the first planetary speed reducer and the second planetary speed reducer mounted on the wheel bearing device, and power is supplied to the hub wheel constituting the wheel bearing device. Since the electric motor is separated and integrated with the outer member of the wheel bearing device, a large reduction ratio can be obtained in a small space, and the overall weight of the device including the electric motor can be reduced. Compactness can be achieved. Therefore, 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. Furthermore, disassembly and assembly of the apparatus can be improved, and resource saving and maintenance cost can be reduced.

  Moreover, invention of Claim 2 among this invention is the 1st and 2nd planetary speed reducer with which the wheel bearing apparatus was mounted | worn with this wheel bearing apparatus, and was connected via the connection shaft, A drive unit having an electric motor for driving the first planetary reduction gear, wherein the wheel bearing device includes a hub wheel having a wheel mounting flange at one end, and a double row inner rolling surface on the outer periphery. An inner ring in which at least one inner rolling surface 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 rolling between these both rolling surfaces The first planetary speed reducer is provided on an inner peripheral side of the outer member, and an input element connected to a rotating shaft so as not to rotate relative to the rotating shaft. A fixed element, a plurality of planetary elements disposed between the fixed element and the input element, and the planetary elements connected to each other. An output element that is rotatably supported with respect to the shaft, and the second planetary speed reducer is disposed on the inner peripheral side of the outer member, with the input element connected to the connecting shaft so as not to rotate relative to the connecting shaft. A fixed element, 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, Includes a stator housing that constitutes the electric motor and is detachably integrated with the outer member, a stator portion built in the stator housing, and a stator portion through a predetermined air gap. And a rotating member that is fixed to the outer member and is rotatably supported with respect to the outer member, and that integrally includes the rotating shaft, and the electric motor rotates in the first and second directions. Through the planetary reducer And to drive the wheels is transmitted to the wheel hub.

  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. Furthermore, for example, when parts are replaced due to a failure of the wheel bearing device, the wheel bearing device and the electric motor can be easily separated, so that it is not necessary to replace the entire device, thereby saving resources. At the same time, maintenance costs can be reduced.

  In the invention according to claim 3, since the electric motor is disposed between the double row bearings, the air gap between the stator portion and the rotor portion is not affected by the elastic deformation of the bearing portion. Since it does not change, the attitude of the electric motor is stabilized and 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. Furthermore, it is difficult to apply an uneven load to the support bearing, and the rotor posture is stabilized.

  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.

  According to a seventh aspect of the present invention, the stator portion includes a stator iron core and a stator coil wound around the stator iron core, and the stator iron core is connected to the outer member via the stator housing. Since it is fastened to the body mounting flange, the stator core can be firmly fixed to the stator housing, and the stator can be prevented from being displaced or dropped during operation of the vehicle, improving the reliability of the device. Can be made.

  Further, according to the eighth aspect of the present invention, if each element of the planetary reduction gear is transmitted power by friction means, noise and vibration generated during power transmission can be suppressed as much as possible.

  According to the ninth aspect of the present 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. 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 electric motor is detachably integrated with the outer member of the wheel bearing device, so that a large reduction ratio can be achieved in a small space. Thus, the entire apparatus including the electric motor can be reduced in weight and size. Therefore, 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. Furthermore, disassembly and assembly of the apparatus can be improved, and resource saving and maintenance cost can be reduced.

  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, wherein the wheel bearing device has at least one of a hub wheel having a wheel mounting flange at one end 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 circumference, and accommodated in a freely rollable manner between these rolling surfaces. The first planetary speed reducer includes an input element connected to a rotation shaft so as not to be relatively rotatable, and a fixed element disposed on the inner peripheral side of the outer member. A plurality of planetary elements disposed between the fixed element and the input element, and the planetary elements connected to the connecting shaft. The second planetary speed reducer is disposed on the inner peripheral side of the outer member, and the input element is connected to the connecting shaft so as not to rotate relative to the connecting shaft. A fixed element; 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. A stator housing that constitutes the electric motor and is integrally disposed in the outer member in a separable manner, a stator portion built in the stator housing, and a rotor facing the stator portion via a predetermined air gap And a rotating member that is rotatably supported with respect to the outer member and that integrally has the rotating shaft, and the rotation of the electric motor is controlled by the first and second planets. Front through reducer Since the wheel is driven by transmitting to the hub wheel, a sufficient space for the bearing portion can be secured, and the durability of the bearing portion can be improved by increasing the supporting strength against the moment load. The overall weight and size can be reduced. Furthermore, for example, when parts are replaced due to a failure of the wheel bearing device, the wheel bearing device and the electric motor can be easily separated, so that it is not necessary to replace the entire device, thereby saving resources. At the same time, maintenance costs can be reduced.

  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 includes a sun gear coupled to a rotation shaft so as not to rotate relative thereto, and a plurality of planetary gears disposed between the outer member and the sun gear. And a carrier pin that rotatably supports these planetary gears with respect to the connecting shaft, and the second planetary reducer includes a sun gear connected to the connecting shaft so as not to rotate relative to the connecting shaft, and the outer member. A plurality of planetary gears disposed between the sun gear and a carrier pin that rotatably supports the planetary gears with respect to the hub wheel. The drive unit can be separated into the outer member. An electric motor comprising an integrally disposed stator housing, a stator portion built in the stator housing, and a rotor portion facing the stator portion via a predetermined air gap; and the rotor portion is fixed. Above A rotary member that is rotatably supported with respect to a side member and integrally has the rotary shaft, and the electric motor is disposed between the rolling surfaces of the double row, and the rotation of the electric motor is The wheels are driven by being transmitted to the hub wheel via the first and second planetary speed reducers.

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. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1.

  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.

  2 is a cross-sectional view taken along arrow A of FIG. A plurality of rectangular openings 12 are formed on the small-diameter stepped portion 7b and the butting portion 7d of the hub wheel 7 in a circumferentially equidistant manner, and the butting portion 8b of the inner ring 8 at a position corresponding to the opening 12 is also provided. An opening 13 made of a recess 13a is formed. Recesses 12a and 13b are respectively formed in the 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, and a planetary gear (planetary gear) 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 gear 15 ′ is rotatably supported via a rolling bearing 16 with respect to the carrier pin 14 ′. As a result, a sufficient space for the bearing portion can be secured, and the durability of the bearing portion can be improved against moment load, and the device can be further reduced in weight and size. Furthermore, it is difficult to apply an uneven load to the support bearing, and the rotor posture is stabilized. 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 gear (input element) 17 connected to an 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 gear. Four planetary gears (planetary elements) 15 that planetarily move around 17 and carrier pins (output elements) 14 that rotatably support the planetary gears 15 with respect to the connecting shaft 6 are provided. A plurality of carrier pins 14 project from the outer peripheral portion of the flange portion 6a formed integrally with the connecting shaft 6, and are supported so as not to rotate.

  The planetary gear 15 constituting the first planetary speed reducer 3 is rotatably supported by a carrier pin 14 via a bearing (not shown). The planetary gear 15 rotates in mesh with inner teeth 9 d formed on the inner periphery of the outer member (fixed element) 9 on the inboard side and outer teeth 17 a of the sun gear 17. The rotation of the rotating shaft 4 is transmitted to the planetary gear 15 via the sun gear 17, and the planetary gear 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 gear 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 gear 17 ′. 4 planetary gears 15 ′ and a carrier pin 14 ′ that rotatably supports the planetary gears 15 ′ with respect to the hub wheel 7 and the inner ring 8. The planetary gear 15 'rotates in mesh with the inner teeth 9e formed between the double row outer rolling surfaces 9a, 9a of the outer member 9 and the outer teeth 17a' of the sun gear 17 '.

  The rotation of the connecting shaft 6 is transmitted to the planetary gear 15 ′ via the sun gear 17 ′, and the rotation of the planetary gear 15 ′ is further decelerated via the hub wheel (carrier) 7 and transmitted to the wheels. Therefore, the power transmission between the elements of the two planetary speed reducers 3 and 3 ′, that is, the sun gears 17 and 17 ′ and the planetary gears 15 and 15 ′, and the planetary gears 15 and 15 ′ and the outer member 9, is all. Since it is performed by the gear transmission mechanism, power can be transmitted efficiently without sliding contact.

  The reduction ratios of the first and second planetary speed reducers 3 and 3 ′ are appropriately set by changing the ratio between the outer diameter of the planetary gears 15 and 15 ′ and the inner diameter of the outer member 9, that is, the gear ratio. Although adjustable, 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 gears 15 and 15 ′ are disposed in the vicinity of the double row bearings in the wheel bearing device 2, the planetary gears 15 and 15 ′ and the sun gears 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 and meshing noise between the planetary gears 15 and 15 'and the sun gears 17 and 17'.

  1 and 3, the stator unit 18 constituting the drive unit 5 is shown. The stator portion 18 is wound around the stator housing 19 mounted on the inboard side surface of the vehicle body mounting flange 9b of the outer member 9, the stator core 20 incorporated in the stator housing 19, and the iron core 20. The stator coil 21 is included. The stator housing 19 is an annular member having a substantially U-shaped cross section, and a fixed portion 19a extending radially outward on the outer diameter side and a cylindrical portion 19b fitted on the outer member 9 on the inner diameter side. have. And the fixing | fixed part 19a is integrally fastened by the outer member 9 via a fixing volt | bolt (not shown) in the state clamped by the said vehicle body mounting flange 9b and the knuckle (not shown) which comprises a suspension apparatus. . Here, a separation bolt hole 26 is formed in the vehicle body mounting flange 9b. For example, when repairing, a bolt (not shown) is screwed into the separation bolt hole 26 so as to be separated from the vehicle body mounting flange 9b. The stator housing 19 can be separated and easily separated.

  FIG. 4 is a fragmentary view taken along the line IV-IV in FIG. 1 and shows the rotor portion 22 constituting the drive portion 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 projects from the center of the bottom, and is rotatably supported by the stator housing 19 via a rolling bearing 25. ing. 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 gears 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. Can be secured sufficiently, and the ride comfort and running stability can be improved by reducing the unsprung weight of the vehicle. Further, since the electric motor M constituting the drive unit 5 is detachably integrated with the vehicle body mounting flange 9b of the outer member 9, the apparatus can be made compact in the axial direction, and the electric motor M Can be disposed at the approximate center of the axial position of the wheel bearing device 2, that is, between the double row bearings, and the attitude of the electric motor M is stabilized without being affected by the elastic deformation of the bearing portion. Thereby, since the air gap between the stator portion 18 and the rotor portion 22 does not change, the efficiency of the electric motor M is improved, and the drive portion 5 can be stored in the knuckle, so that the electric motor M is protected from stepping stones and the like. can do. Furthermore, for example, when parts are replaced due to a failure of the wheel bearing device 2 or the like, the wheel bearing device 2 and the electric motor M can be easily separated, so there is no need to replace the entire device. Maintenance costs can be reduced along with resource saving.

  FIG. 5 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 described above only in the mounting structure of the stator part, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof. Description is omitted.

  The stator portion 18 includes a stator housing 27, a stator core 20 built in the stator housing 27, and a stator coil 21 wound around the iron core 20. The stator housing 27 is an annular member having a substantially U-shaped cross section, and has a fixed portion 27a on the outer diameter side and a cylindrical portion 19b fitted on the outer member 9 on the inner diameter side. And the fixing | fixed part 27a is integrally fastened by the outer member 9 via the fixing volt | bolt (not shown) in the state fitted by the said vehicle body attachment flange 9b. Here, as in the above-described embodiment, a separation bolt hole 26 is formed in the vehicle body mounting flange 9b, and the stator housing 19 can be easily separated from the vehicle body mounting flange 9b during repair or the like. Furthermore, since the electric motor M and the wheel bearing device 2 can be made into subunits in advance, the assembling accuracy can be improved and the disassembly / assembly of the device can be further improved.

  6 is a longitudinal sectional view showing a third embodiment of the electric wheel drive device according to the present invention, and FIG. 7 is a sectional view taken along the line VII-VII in FIG. The third embodiment is different from the second embodiment (FIG. 5) described above only in the mounting structure of the stator portion, and other parts having the same parts or the same functions are denoted by the same reference numerals. Detailed description thereof will be omitted.

  The stator portion 28 includes a stator housing 29, a stator iron core 30 built in the stator housing 29, and a stator coil 21 wound around the iron core 30. The stator housing 29 is an annular member having a substantially U-shaped cross section, and has a cylindrical portion 19b that is fitted on the outer member 9 on the inner diameter side. In this embodiment, each of the stator cores 30 is formed with a female screw 30a, and as shown in FIG. 7, holes 31a are bored at circumferentially equidistant positions of the vehicle body mounting flange 31, and fixing bolts (not shown) are formed. ), The stator core 30 is fastened integrally. As a result, the stator core 30 can be firmly fixed to the stator housing 29, the stator portion 28 can be prevented from being displaced or dropped during operation of the vehicle, and the reliability of the apparatus can be improved. .

  FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the electric wheel drive device according to the present invention, and FIG. 9 is a sectional view taken along line IX-IX in FIG. Note that this embodiment is mainly different from the above-described embodiment in the configuration of the drive unit, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof is omitted.

  The wheel bearing device 32 integrally has a wheel mounting flange 7e for mounting a wheel at 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 34 having a vehicle body mounting flange 33 integrally therewith, and formed on the inner periphery thereof with double row outer rolling surfaces 9a, 9a facing the inner rolling surfaces 7a, 8a, and both of these rolling members. A double row rolling element 10 accommodated 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 vehicle body mounting flange 33 integrally has a fixing portion 33a at the outer end.

  The drive unit 35 opposes the stator housing 36 fastened to the fixed portion 33a of the vehicle body mounting flange 33, the stator unit 37 built in the stator housing 36, and the stator unit 37 via a predetermined radial clearance. And a rotating member 39 to which the rotor portion 38 is fixed. As shown in FIG. 9, the stator portion 37 includes a stator iron core 40 and a stator coil 41 wound around the stator iron core 40. On the other hand, the rotor portion 38 is constituted by a rotor magnet 42 made of a permanent magnet, and the rotor portion 38 and the stator portion 37 constitute an inner rotor type electric motor M.

  The rotating member 39 is formed in a cup shape, and the rotating shaft 4 protrudes from the center portion, and the rotor portion 38 is fixed to the cylindrical outer peripheral surface. The rotating member 39 is rotatably supported with respect to the stator housing 36 via the rolling bearing 25. When the electric motor M is energized, the rotating member 39 rotates, and the rotation of the rotating member 39 is transmitted to the first planetary speed reducer 3 via the rotating shaft 4. Then, the first planetary speed reducer 3 decelerates at a predetermined reduction ratio m and is transmitted via the connecting shaft 6 to the second planetary speed reducer 3 ′. 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.

  FIG. 10 is a longitudinal sectional view showing a fifth embodiment of the electric wheel drive device according to the present invention. The fifth embodiment is different from the above-described fourth embodiment (FIG. 9) only in the mounting structure of the stator portion, and other parts having the same parts or functions have the same reference numerals. Detailed description thereof will be omitted.

  The stator portion 37 includes a stator housing 43, a stator core 40 built in the stator housing 43, and a stator coil 41 wound around the iron core 40. The stator housing 43 is an annular member having a substantially U-shaped cross section, and integrally includes a fixing portion 43a on the outer diameter side. The fixing portion 43a is integrally fastened to the outer member 34 via a fixing bolt (not shown) in a state where the fixing portion 43a is fitted in the fixing portion 33a of the vehicle body mounting flange 33.

  FIG. 11 is a longitudinal sectional view showing a sixth embodiment of the electric wheel drive device according to the present invention, and FIG. 12 is a sectional view taken along line XII-XII in FIG. This embodiment is different from the above-described fourth embodiment (FIG. 8) 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 detailed description thereof. Is omitted.

  The drive unit 44 is disposed so as to face the stator housing 45 fitted on the outer member 34, the stator unit 37 built in the stator housing 45, and the stator unit 37 through a predetermined radial clearance. The rotor portion 38 and the rotating member 46 that fixes the rotor portion 38 are configured. The stator portion 37 and the rotor portion 38 disposed radially outward of the stator portion 37 constitute an outer rotor type electric motor M.

  The rotating member 46 is formed in a cup shape, and the rotating shaft 4 protrudes from the center portion, and the rotor portion 38 is fixed to the cylindrical inner peripheral surface. The rotating member 46 is rotatably supported with respect to the stator housing 45 through the rolling bearing 25. When the electric motor M is energized, the rotating member 46 is rotated, and the rotation of the rotating member 46 is transmitted to the first planetary speed reducer 3 via the rotating shaft 4. The first planetary speed reducer 3 decelerates at a predetermined reduction ratio m and is transmitted to the second planetary speed reducer 3 ′ via the connecting shaft 6. Further, the rotation of the rotating member 46 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.

  FIG. 13: is a longitudinal cross-sectional view which shows 7th Embodiment of the electrically driven wheel drive device based on this invention. Note that this embodiment is different from the above-described sixth embodiment (FIG. 11) only in the mounting structure of the stator part, 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 stator housing 47 has a substantially L-shaped cross section, and a stator core 40 constituting the stator portion 37 is fixed to the outer peripheral surface thereof. The stator housing 47 is fitted on the outer member 34, and an outer edge portion thereof is fastened to the vehicle body mounting flange 33 of the outer member 34 via a fixing bolt (not shown). The rotating member 46 is rotatably supported by the stator housing 47 via the rolling bearing 25.

  FIG. 14 is a longitudinal sectional view showing an eighth embodiment of the electric wheel drive device according to the present invention. This embodiment is different from the above-described sixth embodiment (FIG. 11) or seventh embodiment (FIG. 13) only in the mounting structure of the stator part, 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 stator housing 48 is formed in a cylindrical shape, and a stator core 40 constituting the stator portion 37 is fixed to the outer peripheral surface thereof. The stator housing 48 integrally has a flange 48a extending radially inward at an end portion on the inboard side, and is fastened to an end surface of the outer member 34 via a fixing bolt (not shown).

  As described above, each of the elements of the two planetary speed reducers 3 and 3 ′ described in detail has been exemplified by a gear transmission mechanism. However, the present invention is not limited to this, and each of the sun rollers (input elements) and It may be a planetary speed reducer provided with a plurality of planetary rollers (planetary elements) that travel around the planet. If these elements are employed, power transmission is performed by friction transmission (traction drive), and therefore noise and vibration generated during power transmission can be suppressed.

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

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

It is a longitudinal section showing a 1st embodiment of an electric wheel drive concerning the present invention. It is a partial cross section A arrow line view of FIG. It is a cross-sectional arrow 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 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 principal part arrow directional view of the cross section along the VII-VII line of FIG. 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 sectional drawing along the IX-IX line of FIG. It is a longitudinal cross-sectional view which shows 5th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is a longitudinal cross-sectional view which shows 6th Embodiment of the electrically driven wheel drive device which concerns on this invention. It is sectional drawing along the XII-XII line | wire 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 the conventional electric wheel drive device.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electric wheel drive device 2, 32 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Wheel bearing device 3 ... 1st planetary speed reducer 3 '... ·················· Second planetary speed reducer 4 ················································· , 44 ... drive part 6 ... connecting shaft 6a ... Flange part 7 ... Hub wheel 7a, 8a ..... Inner rolling surface 7b ... ... Small diameter step 7 c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping part 7d 、 8b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Butt 7e ......... Wheel mounting flange 8 ... .... Inner ring 9, 34 ... Outer member 9a ...・ ・ ・ ・ ・ ・ Outside rolling surface 9b, 31, 33 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 9c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 9d 、 9e ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 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 gears 16, 25 ... Rolling bearings 17, 17 '... ..... sun gears 17a, 17a '... external teeth 18, 28, 37 ... ..... stator parts 19, 27, 29, 36, 43, 45, 47, 48 .. stator housings 19a, 27a, 33a, 43a ..... fixing parts 19b・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder part 2 , 30, 40 ... stator iron core 21, 41 ... stator coil 22, 38 ... rotor part 23, 42 ... rotor magnet 24, 39, 46 ····························································. 30a ······································ ......・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Flange 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electric wheel Drive unit 52 ... Tire 53 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electric motor 55 ・ ・ ・..... gear reducer 55a ........... first gear 55b ... 2nd gear 55c ... Third gear 55d ... 4th gear 56 ... ... Cases 56a, 60a, 61a ......... Recesses 56b ... Hole 57 ... Stator 58 ... ... rotor 59 ... output shaft 59a, 66a ... ... one end 59b, 66b ... the other end 60, 61 ... .... Cover 62 ... Mounting flange 63 ... ... Hub bolts 64, 65, 67, 68 ... Rolling bearings 66 ...・ Support shaft M ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Electric motor m, n ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・·····Reduction ratio

Claims (9)

  Wheel bearing device having double row bearings, 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, wherein the rotation of the electric motor is decelerated in two stages by the first planetary speed reducer and the second planetary speed reducer, and power is supplied to a hub wheel constituting the wheel bearing device. An electric wheel driving device characterized in that, while transmitting, the electric motor is detachably integrated with an outer member of the wheel bearing device. Drive having wheel bearing device, first and second planetary reduction gears mounted on the wheel bearing device and connected via a connecting shaft, and an electric motor for driving the first planetary reduction gear With
The wheel bearing device includes a hub wheel having a wheel mounting flange at one end, an inner ring having at least one inner rolling surface of double row inner rolling surfaces on an outer periphery, and the inner rolling on an inner periphery. An outer member in which a double row outer rolling surface facing the running surface is formed, and a double row rolling element accommodated so as to be freely rollable between the two rolling surfaces,
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 is integrally formed with the outer member so as to be separable from the outer member, a stator unit built in the stator housing, and a predetermined air gap in the stator unit. A rotor part facing each other, and a rotary member to which the rotor part is fixed and rotatably supported with respect to the outer member, and having the rotating shaft integrally,
An electric wheel driving device characterized in that the wheel is driven by transmitting the rotation of the electric motor to the hub wheel via the first and second planetary speed reducers.   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 stator portion includes a stator iron core and a stator coil wound around the stator iron core, and the stator iron core is fastened to a vehicle body mounting flange of the outer member via the stator housing. The electric wheel drive device in any one of thru | or 6.   The electric wheel drive device according to any one of claims 1 to 7, 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 7, wherein each element of the planetary reduction gear is transmitted with power by gear means.

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