JP2008011610A - Drive unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constitution by which a large drive torque can be achieved and also the rotation of a drive motor can be transmitted to a reduction gear accurately while its axial size can be downsized, in a drive unit equipped with a drive motor, the reduction gear, an electromagnetic brake, etc. <P>SOLUTION: In this drive unit equipped with an outer rotor type of drive motor 101 where a rotor 3 is constituted around a stator 2, a reduction gear 103 which decreases its speed, receiving the rotation of the drive motor 101, and an electromagnetic brake 102 which brakes the rotation of the drive motor 101; a tubular part 8 extended toward the reduction gear 103 is made on the side of its one end of the rotor 3, and the axis of a sun gear 16 is threaded into the tubular part 8, and the periphery of the tubular part 8 is supported rotatably by the reduction gear 103. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drive device including a drive motor as a drive source.

  2. Description of the Related Art Conventionally, there has been known a drive device that is integrally provided with a drive motor, a speed reducer that decelerates the rotation of the drive motor, and an electromagnetic brake that brakes the rotation of the drive motor.

In the above drive device, the rotor is disposed inside the stator (inner rotor type), and the rotating shaft that penetrates and is fixed to the rotor extends to both sides in the axial direction. Are joined to the input shaft of the speed reducer, and the other end of the rotating shaft is connected to an electromagnetic brake (for example, see Patent Document 1).
JP-A-2005-240416

  And according to the structure of the conventional drive apparatus, since a drive motor was an inner rotor type | mold, there existed a problem that output torque was small compared with an outer rotor type | mold. In addition, since the rotation of the drive motor is output via the rotary shaft fixed to the rotor and is further joined to the input shaft of the reducer, the influence of eccentricity at this joint, eccentricity between the rotor and the rotary shaft, etc. However, when the rotational force of the rotor is transmitted to the reduction gear, the rotational force may be impaired, and it is difficult to reduce the size in the axial direction.

  Therefore, the present invention can obtain a large drive torque in a drive device including a drive motor, a speed reducer, an electromagnetic brake, etc., and can accurately transmit the rotation of the drive motor to the speed reducer. An object of the present invention is to provide a configuration that can reduce the size of the device.

  The invention according to claim 1, which has been made to achieve the above object, includes an outer rotor type drive motor having a rotor formed on the outer periphery of a stator, a speed reducer that decelerates the rotation of the drive motor, and the drive motor. An electromagnetic brake for braking the rotation of the rotor, wherein a cylindrical portion extending toward the reduction gear side is formed on one end side of the rotor, and the reduction gear is provided on the cylindrical portion. The rotating shaft is inserted and fixed, and the outer periphery of the cylindrical portion is rotatably supported by the speed reducer.

  According to the drive device of claim 1, the drive motor is an outer rotor type, and a cylindrical portion extending toward the reduction gear side is formed on one end side of the rotor, and the reduction gear is formed on the cylindrical portion. The rotation shaft is inserted and fixed, and the outer periphery of the cylindrical part is rotatably supported by the speed reducer, so that a larger output torque can be obtained compared to the inner rotor type and the rotation of the rotor is accurate. It can be transmitted to the reducer well.

  Next, an invention according to claim 2 is the drive device according to claim 1, wherein the electromagnetic brake is formed in an annular shape along the outer periphery of the rotor and is connected to the rotor. To do.

  According to the drive device of the second aspect, the electromagnetic brake is formed in an annular shape along the outer periphery of the rotor and connected to the rotor, so that the axial size can be reduced, and the rotor A motor shaft for transmitting rotation to the electromagnetic brake is not required, and the number of parts can be reduced.

  Next, the invention according to claim 3 is the drive device according to claim 1 or 2, wherein the drive device transmits the rotation of the drive motor to the wheel of the vehicle via a speed reducer. The speed reducer includes a case, a sun gear that rotates in response to the rotation of the drive motor, an internal gear that is disposed around the sun gear via a gap, the internal gear, and the A planetary gear that meshes with the sun gear; and a carrier that rotatably supports the planetary gear, the carrier is fixed to the case in a non-rotatable manner, and the internal gear projects in an axial direction from the case. The wheel is integrally formed on the outer periphery of the internal gear, and the wheel rotates integrally with the internal gear as the sun gear rotates.

  According to the drive device of the third aspect, the internal gear protrudes in the axial direction from the case, the wheel is integrally formed on the outer periphery of the internal gear, and the wheel is integrated with the internal gear as the sun gear rotates. Since it is configured to rotate, the axial size can be reduced and productivity can be improved as compared with the case where the wheel is disposed in the axial direction of the internal gear.

  In the driving device of the present invention, the driving motor is an outer rotor type, and a cylindrical portion extending toward the reduction gear is formed on one end side of the rotor, and the rotation shaft of the reduction gear is inserted into the cylindrical portion. Since the outer periphery of the cylindrical portion is rotatably supported by the speed reducer, a larger output torque can be obtained compared to the inner rotor type, and the rotation of the rotor can be accurately performed with the speed reducer. Can communicate.

  In the drive device of the present invention, the electromagnetic brake is annularly formed along the outer periphery of the rotor and connected to the rotor, so that the axial size can be reduced and the rotation of the rotor is transmitted to the electromagnetic brake. This eliminates the need for a motor shaft to reduce the number of parts.

  The drive device of the present invention is a drive device in which the drive device transmits the rotation of the drive motor to the vehicle wheel via a reduction gear, and the internal gear protrudes in the axial direction from the case, and the outer periphery of the internal gear. Since the wheel is integrally formed with the sun gear and the wheel rotates integrally with the internal gear as the sun gear rotates, the wheel is arranged in the axial direction rather than disposed in the axial direction of the internal gear. The size can be reduced and productivity can be improved.

  Next, a driving apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall configuration of a drive device according to an embodiment to which the present invention is applied, and FIG. 2 is a layout diagram of gears in the drive device of the embodiment.

  As shown in FIG. 1, the drive device 1 includes a drive motor 101 as a drive source, an electromagnetic brake 102 that brakes the rotation of the drive motor 101, and a speed reducer 103 that decelerates the rotation of the drive motor 101 and transmits it to the wheel 26. , Etc.

  The drive motor 101 is an outer rotor type DC brushless electric motor including a stator 2, a rotor 3 coaxially arranged with the stator 2, and a housing 7 that rotatably supports the stator 2. A plurality of permanent magnets 6 are juxtaposed along the inner peripheral surface of the rotor 3, and the stator 2 is excited by a plurality of armature cores that project radially from the outer peripheral surface toward the inner peripheral surface of the rotor 3. The coil 9 is formed by concentrated winding.

  The drive motor 101 detects a change in the magnetic field of the rotor 3 along with the rotation of the rotor 3 along the periphery of the stator 2, and detects a relative rotation amount of the rotor 3 with respect to the stator 2. Is provided. The drive motor 101 rotates the rotor 3 by energizing the excitation coil 9, detects the amount of rotation of the rotor 3 via the speed detector 5, and controls the rotational speed and positioning by a controller (not shown). Configured to do.

  The rotor 3 includes a plurality of permanent magnets 6 inside a cylindrical field core formed by axially laminating thin electromagnetic steel plates that are punched in an annular shape and coated with insulation on both sides. . The permanent magnet 6 is made of a ferrite-based anisotropic rare earth magnet and has an S pole and an N pole in the radial direction (that is, on the outer peripheral surface side and the inner peripheral surface side). The plurality of permanent magnets 6 are arranged such that the respective S poles and N poles appear alternately on the inner peripheral surface side of the rotor 3.

  Further, the rotor 3 is formed with a cylindrical portion 8 extending at one end toward the speed reducer, and a rotating shaft (which is a shaft portion of the sun gear 16) is inserted into and fixed to the cylindrical portion 8. ing. Further, the cylindrical portion 8 is rotatably supported by the carrier 32 of the speed reducer 103 via the bearing 21.

  Next, the electromagnetic brake 102 includes a yoke (electromagnet) 11 fixed to the housing 7, an electromagnetic coil (not shown) housed in the yoke 11, a brake disk 12 fixed to the rotor 3, and a disk brake 12. The armature 13 is disposed between the arm 11 and the yoke 11, and is supported by the side plate 14 so as to be slidable in the axial direction.

  In the electromagnetic brake 102, the armature 13 is biased toward the disc brake 12 by a coil spring (not shown) housed in the yoke 11, and the yoke 11 and the side plate 14 are integrally fixed to the housing 7. An electromagnetic coil in the yoke 11 is connected to a control device (not shown) via a cable.

  In the electromagnetic brake 102, the armature 13 is frictionally engaged with the disc brake 12 by the biasing force of the coil spring when the energization to the electromagnetic coil in the yoke 11 is cut off (OFF), and the rotor 3 rotates. On the other hand, when the electromagnetic coil is energized through the control device, a magnetic force is generated in the yoke 11, and the yoke 11 attracts the armature 13 and separates it from the disc brake 12, thereby braking the rotation of the rotor 3. It is configured to release.

  Next, the speed reducer 103 is fixed to the cylindrical portion 8 of the rotor 3 and rotates with the rotor 3, the internal gear 19 disposed coaxially with the sun gear 16 via a gap, and the gap disposed in the gap. The planetary gears 17 and 18 that are provided and mesh with the sun gear 16 and the internal gear 19 are arranged coaxially with the sun gear 16 and support the planetary gears 17 and 18 rotatably via the connection pins 24 and 25. The case 30 is provided.

  As shown in FIG. 2, in the reduction gear 103, the first planetary gear 17 and the second planetary gear 18 are disposed between the sun gear 16 and the internal gear 19, and the first planetary gear 17. Meshes with the sun gear 16 and the second planetary gear 18, and the second planetary gear 18 meshes with the first planetary gear 17 and the internal gear 19.

  Next, as illustrated in FIG. 1, the case 30, the carrier 32, and the like are integrally fixed by bolts 29. Further, the case 30 is formed with an attachment hole 30h for attaching the wheel drive device 1 to a device (not shown).

  The carrier 32 includes an opening 32a, supports both ends of the connecting pins 24 and 25 on both walls of the opening 32a, and includes cylindrical portions 32g and 32h protruding in the axial direction. The internal gear 19 is rotatably supported. Further, the cylindrical portion 8 of the rotor 3 is rotatably engaged with the inner periphery on one end side of the carrier 32 via the bearing 21.

  The connecting pins 24 and 25 are rotatably engaged with the planetary gears 17 and 18 via bearings 33 and 34. The planetary gears 17 and 18 are rotatably supported by the carrier 32 via connection pins 24 and 25.

  The internal gear 19 is rotatably supported by the case 30 and the carrier 32 via bearings 22 and 23. A support plate 27 for locking the bearing 22 in the axial direction is fixed to the end of the internal gear 19 on the drive motor 101 side via bolts 29.

  Further, the internal gear 19 protrudes in the axial direction from the case 30, and an elastic wheel 26 is integrally formed on the outer periphery of the internal gear 19. Further, the internal gear 19 is formed of a steel material (for example, chrome molybdenum steel) having excellent compressive strength and impact strength, and the wheel 26 is formed of an elastic body (for example, chloroprene rubber) having elasticity more than the internal gear 19. ing.

  In the driving apparatus 1 configured as described above, the sun gear 16 rotates together with the rotor 3 as the driving motor 101 is driven, and then the planetary gear 17 rotates as the sun gear 16 rotates. , 18 rotate about the connecting pins 24, 25, and the internal gear 19 and the wheel 26 rotate as the second planetary gear 18 rotates.

  Below, the effect of the drive device 1 of the Example which has the said structure is described.

  According to the configuration of the drive device 1 described in the present embodiment, the drive motor 101 is an outer rotor type, and the cylindrical portion 8 extending toward the reduction gear 103 is formed on one end side of the rotor 3. The shaft portion of the sun gear 16 in the speed reducer 103 is inserted and fixed to the cylindrical portion 8, and the outer periphery of the cylindrical portion 8 is rotatably supported by the carrier 32 in the speed reducer. As compared with the above, a large output torque can be obtained, and the rotation of the rotor 3 can be transmitted to the speed reducer 103 with high accuracy.

  In the driving device 1 of the present embodiment, the electromagnetic brake 102 is annularly formed along the outer periphery of the rotor 3 and connected to the rotor 3, so that the axial size can be reduced and the rotor 3 A motor shaft for transmitting the rotation to the electromagnetic brake 102 becomes unnecessary, and the number of parts can be reduced.

  The driving device 1 of the present embodiment is a driving device in which the driving device 1 transmits the rotation of the driving motor 101 to the vehicle wheel 19 via the speed reducer 103, and the internal gear 19 is axially moved from the case 30. The wheel 26 is integrally formed on the outer periphery of the internal gear 19, and the wheel 26 is configured to rotate integrally with the internal gear 19 as the sun gear 16 rotates. Rather than connecting the gear 19 in the axial direction, the axial size can be reduced and productivity can be improved.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, It can take various aspects.

It is sectional drawing showing the structure of the drive device of one Example of this invention. FIG. 3 is an arrangement diagram of gears in the driving device of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Drive device, 2 ... Stator, 3 ... Rotor, 6 ... Permanent magnet, 7 ... Housing, 8 ... Cylindrical part, 9 ... Excitation coil, 11 ... Yoke (electromagnet), 12 ... Disc brake, 13 ... Amateur (braking) Plate), 14 ... side plate, 16 ... sun gear, 17, 18 ... planetary gear, 19 ... internal gear, 20, 21, 22, 23, 33, 34 ... bearing, 24, 25 ... connecting pin, 26 ... wheel, 27 ... support plate, 28, 29 ... bolt, 30 ... case, 30h ... mounting hole, 31 ... speed detector, 32 ... carrier, 32a ... opening, 32g, 32h ... cylindrical part, 101 ... drive motor, 102 ... Electromagnetic brake, 103 ... reducer.

Claims (3)

An outer rotor type drive motor having a rotor formed on the outer periphery of the stator;
A speed reducer that decelerates the rotation of the drive motor;
An electromagnetic brake for braking the rotation of the drive motor;
A drive device comprising:
A cylindrical portion extending toward the speed reducer side is formed on one end side of the rotor,
The rotating shaft of the speed reducer is inserted and fixed in the cylindrical part,
The outer periphery of the cylindrical part is rotatably supported by the speed reducer,
A drive device characterized by that. The electromagnetic brake is
It is configured in an annular shape along the outer periphery of the rotor, and is connected to the rotor.
The drive device according to claim 1. The drive device is a drive device that transmits the rotation of a drive motor to a vehicle wheel via a speed reducer,
The speed reducer is
Case and
A sun gear that rotates in response to the rotation of the drive motor;
An internal gear disposed with a gap along the circumference of the sun gear;
A planetary gear meshing with the internal gear and the sun gear;
A carrier that rotatably supports the planetary gear;
Composed by
The carrier is non-rotatably fixed to the case;
The internal gear protrudes in the axial direction from the case, and the wheel is integrally formed on the outer periphery of the internal gear,
The wheel is configured to rotate integrally with the internal gear as the sun gear rotates.
The drive device according to claim 1, wherein the drive device is provided.

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