JP5071306B2 - Drive device - Google Patents

Description

  The present invention relates to a drive device including a lock mechanism that locks a rotor of an electric motor disposed in a power transmission path.

  A hybrid vehicle having a brake for locking a rotor of an electric motor is well known. For example, it is known that an outer plate is attached to the inner peripheral surface of a rotor rim provided with a plurality of electromagnetic steel plates, and the inner plate provided on the casing of the electric motor is pressed against the outer plate to lock the rotor ( Patent Document 1). In addition, there is Patent Document 2 as a prior art document related to the present invention.

Japanese Patent Laid-Open No. 10-44789 JP-A-8-183348

  In the apparatus of Patent Document 1, when the inner plate is pressed against the outer plate, stress may be generated in the rim and the rim may be deformed. In this case, the electrical steel sheet attached to the outer peripheral surface of the deformed rim may be deformed at the same time.

  Then, an object of this invention is to provide the drive device which can suppress a deformation | transformation of the rotor core at the time of locking the rotor of an electric motor.

According to another aspect of the present invention, there is provided a driving apparatus including: an electric motor disposed in a power transmission path; and a lock mechanism capable of locking the rotor of the electric motor, wherein the locking mechanism rotates integrally with the rotor, and the rotor And a rotation-side engagement member formed as a separate part, and a fixed member that is movable between an engagement position that engages with the rotation-side engagement member and a release position that releases the engagement. The rotation-side engagement member is provided at a position away from the rotor core of the rotor with respect to the rotation axis direction of the rotor, and the rotor is related to the rotation axis direction of the rotor. A support portion formed larger than the rotor core and connected to an inner peripheral surface of the rotor core, wherein the rotation-side engagement member is an end portion of the support portion with respect to a rotation axis direction of the rotor; And extended over to a position wherein the rotor core overlaps it is attached to the inner circumferential surface of the support portion, to solve the problems described above by (claim 1).

  According to this drive device, when the fixed engagement member moves to the engagement position, the rotor is locked, and stress is generated in the rotation engagement member. However, since the rotation-side engagement member is provided at a position away from the rotor core with respect to the rotation axis direction of the rotor, transmission of stress generated in the rotation-side engagement member to the rotor core can be reduced. Thereby, the deformation | transformation of the rotor core at the time of locking the rotor of an electric motor can be suppressed.

In addition, since the rotation-side engagement member and the rotor are formed as separate parts, the rotor is more compact than the case where the rotation-side engagement member and the rotor are integrally formed. The ease of assembly when assembling is improved. Further, since the rotation-side engagement member is attached to the inner peripheral surface of the support portion so as to extend from the end portion of the support portion to the position overlapping with the rotor core with respect to the rotation axis direction of the rotor, Compared with the case where it is attached to the support portion so as not to overlap the rotor core, the contact area between the rotation side engaging member and the support portion can be increased. Thereby, the intensity | strength substantially equivalent to the case where a rotation side engaging member and a rotor are integrally formed is securable.

In one aspect of the present invention, the electric motor includes a stator that is formed larger than the rotor core with respect to the rotation axis direction of the rotor and is provided on an outer peripheral side of the rotor core, and the rotation-side engagement member includes the rotation-side engagement member, parallel to the rotor core with respect to the rotational axis of the rotor, and may be provided so as to be located on the inner peripheral side of the stator (claim 2). According to this aspect, since the rotation-side engagement member is provided in parallel with the rotor core in the rotation axis direction of the rotor and on the inner peripheral side of the stator, it is approximately the same as the size of the drive device when the lock mechanism is omitted. Can be sized.

  As described above, according to the present invention, when the stationary engagement member moves to the engagement position, the rotor is locked, and stress is generated in the rotation engagement member. However, since the rotation-side engagement member is provided at a position away from the rotor core with respect to the rotation axis direction of the rotor, transmission of stress generated in the rotation-side engagement member to the rotor core can be reduced. Thereby, the deformation | transformation of the rotor core at the time of locking the rotor of an electric motor can be suppressed.

(First form)
FIG. 1 shows an outline of a vehicle to which a drive device according to an embodiment of the present invention is applied. As shown in this figure, the vehicle 1 is configured as a so-called hybrid vehicle. The vehicle 1 is provided with a driving device 2 for traveling. As is well known, a hybrid vehicle is a vehicle that includes an internal combustion engine as a driving force source for traveling and also includes an electric motor as another driving force source for traveling.

  The driving device 2 includes an internal combustion engine 3, a first motor / generator 4 as an electric motor, a power distribution mechanism 5 to which the internal combustion engine 3 and the first motor / generator 4 are respectively connected, and a driving wheel 10 of the vehicle 1. And an output gear 6 for outputting. The drive device 2 is provided with a second motor / generator 8 connected to the output gear 6 via a speed reduction mechanism 7. The power of the output gear 6 is transmitted to the left and right drive wheels 10 via the actuator 9.

  The internal combustion engine 3 is configured as a spark ignition type multi-cylinder internal combustion engine, and the power is transmitted to the power distribution mechanism 5 via the input shaft 11. A damper 12 is interposed between the input shaft 11 and the internal combustion engine 3, and torque fluctuations of the internal combustion engine 3 are absorbed by the damper 12. The first motor / generator 4 and the second motor / generator 8 have the same configuration, and have both a function as an electric motor and a function as a generator.

  FIG. 2 is a view showing a part of the first motor / generator 4 and its periphery. As shown also in this figure, the first motor / generator 4 is fixed to a rotor 4a provided coaxially with the input shaft 11 and to a casing 13 as a fixing member located on the outer peripheral side of the rotor 4a. Stator 4b. The rotor 4a is supported on the casing 13 via bearings 16 and 17 in a state where the rotor core 15 formed by superimposing a plurality of electromagnetic steel plates 14 and the hollow core and the input shaft 11 is inserted. And a support portion 19 that extends from the rotor shaft 18 outward in the radial direction of the rotor 4 a and is connected to the inner peripheral surface of the rotor core 15. The support portion 19 is formed larger than the rotor core 15 with respect to the direction of the rotation axis Ax of the rotor 4 a and extends along the side surface of the rotor core 15. The stator 4b is configured by overlapping a plurality of electromagnetic steel plates 20, and is provided so as to protrude from the stator core 21 in the direction of the rotation axis Ax of the rotor 4a. The coil part 22 is provided. Similarly, the second motor / generator 8 includes a rotor 8a and a stator 8b.

  The power distribution mechanism 5 is configured as a single pinion type planetary gear mechanism having three elements capable of differential rotation with each other, and is arranged coaxially with the sun gear S1 that is an external gear and the sun gear S1. And a carrier C1 that holds the pinion meshing with the gears S1 and R1 so as to rotate and revolve freely. In this embodiment, the input shaft 11 is connected to the carrier C1, the first motor / generator 4 is connected to the sun gear S1, and the output gear 6 is connected to the ring gear R1.

  The speed reduction mechanism 7 is a mechanism for reducing the rotation of the second motor / generator 8 and transmitting it to the output gear 6. The speed reduction mechanism 7 is configured as a single pinion type planetary gear mechanism having three elements capable of differential rotation. Has been. The speed reduction mechanism 7 holds a sun gear S2 that is an external gear, a ring gear R2 that is an internal gear coaxially disposed with respect to the sun gear S2, and a pinion that meshes with the gears S2 and R2 so as to rotate and revolve freely. Carrier C2. In this embodiment, the sun gear S2 is connected to the second motor / generator 8, the ring gear R2 is connected to the output gear 6, and the carrier C2 is fixed to the casing 13. Thus, the rotation of the second motor / generator 8 is decelerated and transmitted to the output gear 6, and the power of the second motor / generator 8 is amplified and transmitted to the output gear 6.

  The drive device 2 is provided with a lock mechanism 23 that locks the rotor 4 a of the first motor / generator 4. The lock mechanism 23 is parallel to the rotor core 15 in the direction of the rotation axis Ax of the rotor 4a and is located on the inner peripheral side of the coil portion 22 (see FIG. 2). FIG. 3 is an enlarged view of the lock mechanism 23 and its surroundings according to the drive device 2 of FIG. As shown in this figure, the lock mechanism 23 is configured as a so-called wet multi-plate brake, and includes a plurality of fixed-side friction plates 25 provided on the casing 13 via fixed-side support members 24, and a support portion 19. A plurality of rotation-side friction plates 27 provided via the rotation-side support member 26 and arranged alternately with the fixed-side friction plates 25, and an engagement position where the fixed-side friction plates 25 engage with the rotation-side friction plates 27. And a piston 28 that applies pressure to the fixed friction plate 25 so as to be movable between the engagement position and the release position where the engagement is released. These friction plates 25 and 27 are spline-coupled to the fixed-side support member 24 and the rotation-side support member 26, respectively, and the movement of the rotor 4a in the rotation direction is restricted, and only in the direction of the rotation axis Ax of the rotor 4a. I can move. The stationary support member 24 is provided with a stopper 29 that restricts the movement of the friction plates 25 and 27. The rotation-side support member 26 is located away from the rotor core 15 with respect to the direction of the rotation axis Ax of the rotor 4a, and is formed integrally with the support portion 19. Further, the lock mechanism 23 receives a sudden pressure generated in the fixed side friction plate 25, a return spring 30 that urges the piston 28 to the right side in FIG. 3, an oil ring 32 that seals oil leakage from the hydraulic chamber 31. An absorbing dish plate 33 is provided.

  When oil is introduced into the hydraulic chamber 31, pressure is applied from the piston 28 to the fixed friction plate 25 via the dish plate 33, so that a frictional force is generated between the friction plates 25 and 27 and the rotor 4a is locked. . As a result, a fixed shift stage that does not use the first motor / generator 4 can be realized. On the other hand, when the introduction of oil into the hydraulic chamber 31 is stopped, the piston 28 is driven to the right side in FIG. 3 by the return spring 30 to disengage the friction plates 25 and 27 and the rotor 4a can rotate. Become. Thereby, an electric continuously variable transmission using the first motor / generator 4 can be realized.

  FIG. 4 shows an example of a collinear diagram when the lock mechanism 23 locks the rotor 4 a of the first motor / generator 4. In this figure, “MG1” indicates the first motor / generator 4, “ENG” indicates the internal combustion engine 3, and “OUT” indicates the output gear 6. As is clear from this figure, since the rotation of the first motor / generator 4 becomes zero when the fixed-side friction plate 25 moves to the engaging position, the first motor-generator 4 is rotated from the internal combustion engine 3 through the power distribution mechanism 5. The power distributed to one motor / generator 4 is added to the output gear 6 and the driving wheel 10 is rotationally driven.

  The fixed support member 24 and the fixed friction plate 25 correspond to a fixed engagement member, and the rotation support member 26 and the rotation friction plate 27 correspond to a rotation engagement member.

  In the drive device configured as described above, when the fixed friction plate 25 moves to the engagement position, the rotor 4a is locked, and stress is generated in the rotation side support member 26. However, since the rotation-side support member 26 is provided in the support portion 19 so as to be separated from the rotor core 15 in the direction of the rotation axis Ax of the rotor 4a, transmission of stress generated in the rotation-side support member 26 to the rotor core 15 is reduced. Thereby, the deformation | transformation of the rotor core 15 at the time of locking the rotor 4a can be suppressed. Further, since the rotation-side support member 26 and the support portion 19 are integrally formed, the strength between the rotation-side support member 26 and the support portion 19 can be maintained uniformly.

  In the drive device 2 of this embodiment, the lock mechanism 23 is parallel to the rotor core 15 in the direction of the rotation axis Ax of the rotor 4a and is located on the inner peripheral side of the coil portion 22. Therefore, the drive device by providing the lock mechanism 23 The enlargement of 2 can be suppressed.

(Second form)
FIG. 5 is an enlarged view of the lock mechanism 34 and its periphery of the driving apparatus according to the second embodiment of the present invention. Note that FIG. 5 corresponds to FIG. 3, and parts that are the same as those in FIG. 3 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 5, in this embodiment, the rotation side support member 35 is not formed integrally with the support portion 19, and the rotation side support member 35 and the rotor 4 a are formed as separate parts. The rotation-side support member 35 is splined to the inner peripheral surface of the support portion 19 so as to straddle from the end of the support portion 19 to the position overlapping the rotor core 15 with respect to the rotation axis Ax direction of the rotor 4a. Thereby, the rotation side support member 35 can rotate integrally with the rotor 4a. The overlap amount of the rotation side support member 35 can be set as appropriate.

  In the drive device according to this embodiment, the rotation-side support member 35 and the rotor 4a are formed as separate parts. Therefore, the rotor 4a is more compact than the case where the rotation-side support member 35 and the support portion 19 are integrally formed. Therefore, the assembling property when the rotor 4a is assembled at a predetermined position is improved. Further, since the rotation-side support member 35 is attached to the inner peripheral surface of the support portion 19 so as to straddle from the end of the support portion 19 to the position overlapping the rotor core 15 with respect to the rotation axis Ax direction of the rotor 4a, Compared with the case where the side support member 35 is attached to the support portion 19 so as not to overlap the rotor core 15, the contact area between the rotation side engagement support member 35 and the support portion 19 can be increased. Thereby, substantially the same intensity | strength as the case where the rotation side support member 35 and the support part 19 are integrally formed is securable.

  This embodiment is not limited to the configuration described above. The lock mechanism is not limited to the configuration including the rotation side support member attached to the support portion by spline coupling. For example, the lock mechanism may be configured to include a rotation-side support member attached to the support portion using a key such as a round key or a square key.

  The present invention is not limited to the above embodiments, and can be implemented in various forms within the scope of the gist of the present invention. The drive device of the present invention is not limited to being applied to a hybrid vehicle. Therefore, the present invention can be implemented as a drive device that locks the rotor of an electric motor provided in some power transmission path. The number of fixed side friction plates 25 and rotation side friction plates 27 may be set arbitrarily.

The figure which showed the outline of the vehicle incorporating the drive device which concerns on one form of this invention. The figure which showed a part of 1st motor generator, and its periphery. The figure which expanded and showed the locking mechanism which concerns on the drive device of FIG. 2, and its periphery. The figure which showed an example of the alignment chart at the time of a locking mechanism locking a rotor. The figure which expanded the lock mechanism of the drive device concerning the 2nd form, and its circumference.

Explanation of symbols

2 Drive device 3 Internal combustion engine 4 First motor / generator (electric motor)
4a, 8a Rotor 4b, 8b Stator 15 Rotor core 19 Support part 23, 34 Lock mechanism 24 Fixed side support member 25 Fixed side friction plate 26, 35 Rotation side support member 27 Rotation side friction plate

Claims (2)

In a drive apparatus comprising: an electric motor disposed in a power transmission path; and a lock mechanism capable of locking a rotor of the electric motor.
The lock mechanism rotates integrally with the rotor and is formed as a separate part from the rotor, an engagement position that engages with the rotation side engagement member, and a release that releases the engagement. A fixed-side engagement member provided on the fixed member so as to be movable between positions, and the rotation-side engagement member is located away from the rotor core of the rotor with respect to the rotation axis direction of the rotor. provided,
The rotor has a support portion that is formed larger than the rotor core with respect to the rotation axis direction of the rotor and is connected to the inner peripheral surface of the rotor core, and the rotation-side engagement member is in the rotation axis direction of the rotor Is attached to the inner peripheral surface of the support portion so as to straddle from the end portion of the support portion to a position overlapping with the rotor core,
A drive device characterized by that. The electric motor has a stator formed larger than the rotor core with respect to the rotation axis direction of the rotor, and provided on the outer peripheral side of the rotor core,
The drive device according to claim 1 , wherein the rotation-side engagement member is provided so as to be positioned in parallel with the rotor core and on an inner peripheral side of the stator with respect to a rotation axis direction of the rotor.

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