JP5104658B2 - Drive device - Google Patents

Description

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

  As a drive device mounted on a so-called hybrid vehicle, one having a lock mechanism that locks an electric motor using a wet multi-plate brake is known (Patent Document 1). In addition, there is Patent Document 2 as a prior art document related to the present invention.

JP-A-8-183348 JP 2003-11893 A

  The driving device disclosed in Patent Document 1 switches between an engaged state in which the electric motor is locked and a released state in which the electric motor is unlocked, thereby realizing an electric continuously variable transmission using the electric motor and a fixed state in which the electric motor is not used. It is possible to selectively execute the drive mode for realizing the shift speed. However, the driving device of Patent Document 1 generates drag torque due to the shearing force of oil interposed between multiple plates of the wet multi-plate brake even when the lock of the electric motor is released. Further, in order to maintain the lock of the electric motor, it is necessary to continue supplying energy for maintaining the state where the brake plates are pressed against each other. Therefore, the drive device of Patent Document 1 has a problem that loss increases due to the presence of such a locking mechanism.

  Accordingly, a first object of the present invention is to provide a drive device that does not require energy supply in order to maintain the lock of the electric motor. A second object of the present invention is to provide a drive device that can reduce the supply of energy in order to maintain the lock of the electric motor.

According to a first driving device of the present invention, an electric motor disposed in a power transmission path, an engaging state in which a rotating member that can rotate integrally with the electric motor is engaged with a fixed member, and the electric motor is locked, and the lock A locking mechanism that is switchable between a released state and a release state for releasing the lock, wherein the lock mechanism is capable of shifting from the released state to the engaged state by a predetermined power; and have a, a self-locking means for maintaining the engagement state without the power of the actuator by utilizing the torque generated in the rotary member after the transition to the engaged state from the disengaged state, the self-locking means, A first member capable of rotating integrally with the rotating member; a second member disposed coaxially in a state facing the first member; the first member and the second member An interposition member interposed between the first member and the second member in a state of being held in the groove portion formed on the respective opposing surfaces and gradually decreasing in depth with respect to the rotation direction, The rotating member is arranged so that a gap is formed between the second member and the friction part stationary with respect to the fixed member in the released state, and after the transition from the released state to the engaged state When a torque in a predetermined direction is generated, a force in a direction of pressing the second member against the friction portion is generated, and the actuator is moved from the released state to the engaged state. It is comprised so that the motive power which draws and contacts the said 2nd member to the said friction part can be generate | occur | produced (Claim 1).

According to this drive device, once the actuator is shifted from the released state to the engaged state, the engaged state can be maintained without the power of the actuator by utilizing the torque generated in the rotating member after the transition. Accordingly, since it is not necessary to supply energy in order to maintain the engaged state, it is possible to reduce the loss accompanying the mounting of the lock mechanism. Further, when a torque in a predetermined direction is generated in the rotating member in the engaged state, a force in a direction of pressing the second member against the friction portion acts. Accordingly, the friction force between the second member and the friction portion is not lost even if there is no force that pulls the second member to the friction portion by the actuator after the transition from the released state to the engagement state. The engaged state can be maintained.

In one aspect of the drive device of the present invention, the self-locking means further includes a biasing means for biasing the second member in a direction approaching the first member, and the predetermined direction in the engaged state. When a negative torque in the opposite direction to the rotation member is generated in the rotating member, the force in the direction of pressing the second member against the friction part is lost using the negative torque, and the biasing means is used. You may be comprised so that it can transfer to the said releasing state from the said engagement state (Claim 2 ). In this case, when a negative torque in the direction opposite to the predetermined direction is generated, the force in the direction of pressing the second member against the friction portion is lost. That is, since the frictional force between the second member and the friction portion is eliminated, the biasing means can be used after the elimination to shift from the engaged state to the released state without operating the actuator.

In one aspect of the driving apparatus of the present invention, the power transmission path has an internal combustion engine and three rotational elements that can rotate differentially with each other, and the internal combustion engine is included in any one of the rotational elements. A power distribution mechanism in which the electric motor is connected to another element, and an output member for driving a driving wheel of the vehicle is connected to the remaining element, and another electric motor different from the electric motor connected to the output member And may be arranged (claim 3 ). According to this aspect, the drive device is configured as a so-called hybrid vehicle drive device. For this reason, it is possible to switch between an engaged state in which the electric motor is locked and a released state in which the lock is released using the lock mechanism according to the present invention. Thereby, the drive mode which implement | achieves the electrical continuously variable transmission using an electric motor, and the drive mode which implement | achieves the fixed gear stage which does not use an electric motor can be selectively performed .

As described above, according to the driving movement device of the present invention, because without power actuator can maintain engagement state by utilizing the torque generated in the rotary member from the released state after the transition to the engaged state, engagement There is no need to supply energy to maintain the integrity. Further, when a torque in a predetermined direction is generated in the rotating member in the engaged state, a force in a direction of pressing the second member against the friction portion is applied. Since the frictional force between the second member and the frictional part is not lost even if there is no force pulling the frictional part toward the frictional part, the engaged state can be maintained without the power of the actuator.

(First form)
FIG. 1 schematically shows an overall configuration of a vehicle in which a driving apparatus according to an embodiment of the present invention is incorporated, and FIG. 2 shows in detail a main part of the driving apparatus shown in FIG. The vehicle 1 is configured as a so-called hybrid vehicle. 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 vehicle 1 is configured as an FF layout vehicle in which drive wheels and an internal combustion engine are located at the front of the vehicle.

  As shown in these drawings, 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, An output gear 6 is provided as an output member for outputting power to the drive wheels 10 of the vehicle 1. Further, the drive device 2 is provided with a second motor / generator 8 as another electric motor connected to the output gear 6 through the transmission mechanism 7. The power of the output gear 6 is transmitted to the left and right drive wheels 10 via the differential device 11.

  The internal combustion engine 3 is configured as a spark ignition type multi-cylinder internal combustion engine, and its power is transmitted to the power distribution mechanism 5 via the input shaft 15. A damper 16 is interposed between the input shaft 15 and the internal combustion engine 3, and torque fluctuations of the internal combustion engine 3 are absorbed by the damper 16. 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. The first motor / generator 4 includes a stator 4a fixed to a case 17 as a fixing member, and a rotor 4b arranged coaxially on the inner peripheral side of the stator 4a. Similarly, the second motor / generator 8 includes a stator 8a fixed to the case 17, and a rotor 8b arranged coaxially on the inner peripheral side of the stator 8a.

  The power distribution mechanism 5 is configured as a single pinion type planetary gear mechanism having three elements that can rotate differentially with each other, and is arranged coaxially with the sun gear Su1 that is an external gear and the sun gear Su1. And a carrier Cr1 that holds the pinion 20 meshing with the gears Su1 and Ri1 so as to rotate and revolve freely. In this embodiment, the input shaft 15 is connected to the carrier Cr1, the first motor / generator 4 is connected to the sun gear Su1 via the connecting member 21 as a rotating member, and the output gear 6 is connected to the ring gear Ri1. As shown in FIG. 2, the connecting member 21 is formed in a hollow shape and is supported by the case 17 via bearings 22 and 23 in a state where the input shaft 15 is inserted. A rotor 4 b of the first motor / generator 4 is fixed to the outer periphery of the connecting member 21.

  As shown in FIG. 1, 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, and is a single pinion having three elements capable of differentially rotating with respect to each other. It is configured as a type planetary gear mechanism. The speed reduction mechanism 7 is capable of rotating and revolving a sun gear Su2 that is an external gear, a ring gear Ri2 that is an internal gear disposed coaxially with the sun gear Su2, and a pinion 25 that meshes with these gears Su2 and Ri2. And a carrier Cr2 to be held. In this embodiment, the sun gear Su2 is connected to the second motor / generator 8, the ring gear Ri2 is connected to the output gear 6, and the carrier Cr2 is fixed to the case 17. 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 30 for changing the drive mode by switching between an engaged state in which the first motor / generator 4 is locked and a released state in which the lock is released. The lock mechanism 30 selectively executes a drive mode that realizes an electrical continuously variable transmission using the first motor / generator 4 and a drive mode that realizes a fixed gear shift that does not use the first motor / generator 4. it can. The lock mechanism 30 is interposed between the connecting member 21 and the case 17, an engagement mechanism 31 as a self-locking means that can fix the connecting member 21 to the case 17, and a solenoid type that operates the engagement mechanism 31. And an actuator 32. Details of the lock mechanism 30 will be described later. First, an outline of the lock mechanism 30 will be described with reference to FIGS. 3 and 4.

  3 and 4 are explanatory diagrams for explaining the outline of the lock mechanism 30. FIG. FIG. 3 shows an engaged state in which the first motor / generator 4 can be locked, and FIG. 4 shows a released state in which the lock of the first motor / generator 4 is released. The engagement mechanism 31 of the lock mechanism 30 is provided with an inner ring 35 and an outer ring 36 that are coaxial with each other, and an interposition member 37 that is provided in an annular space S formed between the inner ring 35 and the outer ring 36. The inner ring 35 as the first member is fixed to the connecting member 21 and rotates integrally with the connecting member 21. The outer ring 36 as the second member is fixed to the case 17. The lock mechanism 30 can switch between an engagement state in which the first motor / generator 4 can be locked and a release state in which the lock is released by operating the interposition member 37 of the engagement mechanism 31 using the actuator 32. .

  As can be understood from FIGS. 3 and 4, after the actuator 32 shifts from the released state to the engaged state, the rotation of the first motor / generator 4 in the forward rotation direction (+ direction) is restricted and locked. . Then, after the transition to the engaged state, the direction in which the annular space S between the inner ring 35 and the outer ring 36 is expanded by the interposed member 37 as long as the forward rotation direction torque (positive torque) acts on the connecting member 21. Therefore, the engaged state is maintained without the power of the actuator 32. That is, the positive torque generated in the connecting member 21 causes a so-called wedge effect between the inner ring 35, the outer ring 36, and the interposition member 37, and the engagement mechanism 31 enters a self-locking state.

  Further, when torque (negative torque) in the reverse rotation direction (− direction) opposite to the normal rotation direction is applied to the connecting member 21 in the engaged state, the force in the direction of expanding the annular space S is lost. Therefore, the self-lock is released without the power of the actuator 32, and the state can be shifted from the engaged state to the released state. Further, the interposition member 37 is urged by an urging means described later in a direction in which the released state is maintained. Therefore, as shown in FIG. 4, when the lock mechanism 30 is in the released state, the released state is maintained without the power of the actuator 32, and the connecting member 21 is allowed to rotate in the forward direction and the reverse direction. The

  5 and 6 are cross-sectional views showing details of the lock mechanism 30. FIG. 5 shows an engaged state, and FIG. 6 shows a released state. As shown in these drawings, in the annular space S formed between the inner ring 35 and the outer ring 36, seven interposed members 37 are provided at substantially equal intervals. The interposition member 37 is configured in a cylindrical shape. The annular space S has a section Sa provided for each interposed member 37, and each section Sa is formed such that the radial width gradually decreases in the forward rotation direction. The rear end portion of each section Sa is wider than the interposed member 37.

  In the annular space S, an annular cage 38 is provided as a holding means in which a pocket 38 a for holding the interposition member 37 is formed for each interposition member 37. The cage 38 can rotate relative to each of the inner ring 35 and the outer ring 36. The lock mechanism 30 is provided with a transmission mechanism 39 for transmitting the power of the actuator 32 to the interposition member 37 via the retainer 38. The transmission mechanism 39 includes a lever 40 that extends radially outward from the cage 38 and a rod 41 that is connected to the actuator 32 and linked to the tip of the lever 40. The lock mechanism 30 is provided with a return spring 42 as an urging means for urging the retainer 38 in the release direction. The return spring 42 is supported at one end by a spring seat 43 formed on the rod 41 and at the other end by the case 17.

  Since the lock mechanism 30 has such a configuration, when a positive torque acts on the connecting member 21 and the inner ring 35 in the engaged state of FIG. 5, a force acts in the direction in which each section Sa is enlarged by the interposed member 37. As a result, without the power of the actuator 32, in other words, as long as a positive torque is applied to the connecting member 21 without applying a force to the retainer 38, a self-locking state is established and the engaged state can be maintained. In the engaged state of FIG. 5, if a negative torque in the opposite direction acts on the connecting member 21, the force in the direction of expanding each section Sa is lost, and the elastic force of the return spring 42 acts on the cage 38. The self-lock is released and the state can be shifted to the released state shown in FIG. Once the state is shifted to the released state, the released state is maintained without the power of the actuator 32 by the elastic force of the return spring 42. Further, switching from the released state of FIG. 6 to the engaged state of FIG. 5 is performed in a state where the lever 32 is moved in the forward rotation direction by driving the rod 41 so that the actuator 32 overcomes the elastic force of the return spring 42. This is realized by applying a positive torque to the connecting member 21. After shifting to the engaged state, the power of the actuator 32 is not necessary for maintaining the engaged state as described above.

  According to the above embodiment, since the lock mechanism 30 does not require energy supply by the actuator 32 in order to maintain the engagement state in which the first motor / generator 4 is locked, loss due to mounting of the lock mechanism 30 can be reduced. Can do. Further, the engagement mechanism 31 loses the force in the direction of expanding the annular space S when a negative torque in a direction opposite to the predetermined direction is generated. That is, since the wedge effect generated between the inner ring 35, the outer ring 36, and the interposition member 37 is eliminated, by using the return spring 42 after the elimination, the transition from the engaged state to the released state can be performed without operating the actuator 32. Can do. Further, since the engaged state is maintained when a positive torque is generated in the connecting member 21, even before the connecting member 21 is completely stopped, that is, even when the connecting member 21 is rotating in the forward rotation direction, the released state is maintained. Since it can shift to the engaged state, the responsiveness is improved. Furthermore, since the responsiveness of the lock mechanism 30 is improved, the internal combustion engine 1 can be quickly stopped. Thereby, since the transition from the stop of the internal combustion engine 1 to the regenerative operation by the second motor / generator 8 can be realized quickly, the regenerative efficiency can be improved and the fuel efficiency can be improved.

(Second form)
Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment is the same as the first embodiment except for the configuration of the lock mechanism. Therefore, FIGS. 1 and 2 are referred to as appropriate for the overall configuration of the vehicle in which the drive device including the lock mechanism according to the second embodiment is incorporated. In the following description, the same reference numerals as those in the first embodiment are assigned to the configurations common to the first embodiment in FIGS.

  7 and 8 are diagrams showing details of the lock mechanism 50 according to the second embodiment, in which FIG. 7 shows a released state and FIG. 8 shows an engaged state. The lock mechanism 50 includes an engagement mechanism 51 as self-locking means and an actuator 52 that operates the engagement mechanism 51. The coupling member 21 is connected to the engagement mechanism 51, and the torque of the first motor / generator 4 is input via the coupling member 21. The actuator 52 is interposed between the engagement mechanism 51 and the case 17 and is fixed to the case 17.

  The engaging mechanism 51 includes a first clutch plate 55 as a first member fixed to the connecting member 21, a second clutch plate 56 as a second member arranged coaxially with the first clutch plate 55, A spherical interposed member 57 interposed between the clutch plates 55 and 56 is provided. Each of the clutch plates 55 and 56 is formed in a disc shape, and V-shaped grooves 58 and 59 as groove portions for holding the interposition member 57 are formed on the opposing surfaces of the clutch plates 55 and 56.

  FIG. 9 shows a state in which the first clutch plate 55 is viewed from the axial direction, and FIGS. 10 and 11 show a state in which the clutch plates 55 and 56 are viewed from the radial direction. FIG. 10 shows a state where the clutch plates 55 and 56 are stationary, and FIG. 11 shows a state where the clutch plates 55 and 56 are rotating. As is apparent from FIG. 9, six V-shaped grooves 58 provided in the first clutch plate 55 are arranged at equal intervals in the circumferential direction. Similarly, six other V-shaped grooves 59 formed in the second clutch plate 56 are arranged at equal intervals in the circumferential direction. Each V-shaped groove 58, 59 has a semicircular cross section when cut along a cross section including the center line of the first clutch plate 55 (see FIGS. 7 and 8). Further, as shown in FIG. 9, when viewed from the axial direction of the first clutch plate 55, each V-shaped groove 58, 59 has an inner edge near the center of the first clutch plate 55 and an outer edge away from the center. Are curved to form a concentric arc. Further, as shown in FIGS. 10 and 11, when viewed from the radial direction of the first clutch plate 55, each V-shaped groove 58, 59 is formed in a V-shape, and the rotational direction (upward or downward direction in the figure). ) Is gradually getting shallower.

  As shown in FIG. 7, when the lock mechanism 50 is in the released state, a predetermined gap G is formed between the second clutch plate 56 of the engagement mechanism 51 and the actuator 52. A return spring 60 is provided between the second clutch plate 56 and the actuator 52 to urge the second clutch plate 56 in a direction away from the actuator 52. Therefore, in the released state, the first clutch plate 55 and the second clutch plate 56 are rotated in a state where the second clutch plate 56 is pressed in a direction approaching the first clutch plate 55.

  The actuator 52 is provided with a friction portion 61 that can come into contact with the second clutch plate 56 and an electromagnet 62 incorporated in the friction portion 61. The friction part 61 is stationary with respect to the case 17. Since the second clutch plate 56 is made of a magnetic metal, when the actuator 52 excites the electromagnet 62 in the state of FIG. 7, the second clutch plate 56 is pulled toward the actuator 52 against the elastic force of the return spring 60. It is done. When the second clutch plate 56 comes into contact with the friction portion 61 due to the magnetic force of the electromagnet 62, a frictional force is generated between the second clutch plate 56 and the friction portion 61, so that the second clutch plate 56 is moved to the friction portion 61. Stop against. That is, as shown in FIG. 8, the state shifts to an engagement state in which the first motor / generator 4 is locked.

  When positive torque is generated in the first clutch plate 55, as shown in FIG. 11, the interposition member 57 moves to a shallow position in the V-shaped grooves 58 and 59, and the second clutch plate 56 is moved to the friction portion. A force to press 61 is generated. Therefore, as long as a positive torque is applied to the first clutch plate 55 (to the connecting member 21) after the transition to the engaged state, the pressing force is maintained. Therefore, once the second clutch plate 56 comes into contact with the friction portion 61 due to the excitation of the electromagnet 62 in the released state, the second clutch plate 56 and the friction portion 61 Since the frictional force is not lost, the engaged state can be maintained. That is, a self-locking state in which the engaged state can be maintained without the power of the actuator 52 can be realized.

  In the engaged state of FIG. 8, when a negative torque in the direction opposite to the positive torque acts on the connecting member 21, the force for pressing the second clutch plate 56 against the friction portion 61 is lost (see also FIG. 10), so the self-lock is released. Then, the process shifts to the released state of FIG. After the transition to the released state, the released state of FIG. 7 is maintained without the power of the actuator 52 by the elastic force of the return spring 60. In the released state, the connection member 21 is allowed to rotate in the forward direction and the reverse direction.

  The 2nd form can also have the same effect as the 1st form. That is, according to the second embodiment, when a positive torque is generated in the connecting member 21 in the engaged state, a force in the direction of pressing the second clutch plate 56 against the friction portion 61 is applied, so that the engagement is performed from the released state. Since the friction force between the second clutch plate 56 and the friction portion 61 is not lost even if there is no force to pull the second clutch plate 56 to the friction portion 61 by the actuator 52 after the transition to the state, there is no power of the actuator 52. The engagement state can be maintained. Further, when negative torque is generated, the force in the direction in which the second clutch plate 56 is pressed against the friction portion 61 is lost. That is, since the frictional force between the second clutch plate 56 and the friction portion 61 is eliminated, the return spring 60 is used after the elimination, thereby shifting from the engaged state to the released state without operating the actuator 52. be able to.

  In the second embodiment, various conditions that affect the pressing force such as the inclination angle of the V-shaped grooves 58 and 59 are set so that the force pressing the second clutch plate 56 against the friction portion 61 can be self-locked. ing. Thereby, the engagement mechanism 51 can maintain the engagement state independently without the power of the actuator 52. However, the engagement mechanism 51 can also function as a means for assisting the actuator 52 by changing various conditions of the engagement mechanism 51 so that the pressing force in the engaged state is reduced. That is, the engaged state can be maintained using the power of the actuator 52 and the pressing force by the engaging mechanism 51.

When the various conditions of the engagement mechanism 51 are changed in this way, the power of the actuator required to maintain the engagement state is reduced as compared with the case where the engagement state is maintained only by the actuator 52. Can do. When the power of the actuator 52 is controlled so that the engaged state is maintained on the condition that the engagement mechanism 51 is assisted, the second clutch plate 56 is caused to friction by the action of the counter torque on the connecting member 21. It is possible to immediately shift from the engaged state to the disengaged state when the force in the direction of pressing against the portion 61 is lost .

  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 an electric motor provided in some power transmission path. Further, the illustrated form in which the self-locking means is realized is merely an example, and the self-locking means according to the present invention can be realized in a form different from the illustrated form.

The figure which showed roughly the whole structure of the vehicle incorporating the drive device which concerns on one form of this invention. The figure which showed the principal part of the drive device shown by FIG. 1 in detail. It is explanatory drawing explaining the outline | summary of a locking mechanism, Comprising: The figure which showed the engagement state which can lock a 1st motor generator. It is explanatory drawing explaining the outline | summary of a locking mechanism, Comprising: The figure which showed the releasing state which the lock | rock of the 1st motor generator was cancelled | released. It is sectional drawing which showed the detail of the locking mechanism, Comprising: The figure which showed the engagement state which can lock a 1st motor generator. It is sectional drawing which showed the detail of the locking mechanism, Comprising: The figure which showed the releasing state which the lock | rock of the 1st motor generator was cancelled | released. It is the figure which showed the detail of the locking mechanism which concerns on a 2nd form, Comprising: The figure which showed the releasing state which the lock | rock of the 1st motor generator was released. The figure which showed the detail of the locking mechanism which concerns on a 2nd form, Comprising: The figure which showed the engagement state which can lock a 1st motor generator. The figure which showed the state which looked at the 1st clutch board from the axial direction. The figure which showed the state which looked at each clutch board from the radial direction, Comprising: The figure which showed the state which each clutch board has stopped. The figure which showed the state which looked at each clutch board from the radial direction, Comprising: The figure which showed the state in which each clutch board is rotating.

Explanation of symbols

2 Drive unit 3 Internal combustion engine 4 First motor / generator (electric motor)
5 Power distribution mechanism 6 Output gear (output member)
8 Second motor generator (other electric motors)
17 Case (fixing member)
10 Drive wheel 21 Rotating member (connecting member)
30 Locking mechanism 31 Engaging mechanism (self-locking means)
32 Actuator 35 Inner ring (first member)
36 Outer ring (second member)
37 Intervening member 38 Cage (holding means)
42 Return spring (biasing means)
50 Lock mechanism 51 Engagement mechanism (self-locking means, engagement assisting means)
52 Actuator 55 First Clutch Plate (First Member)
56 Second clutch plate (second member)
57 Interposition members 58, 58 V-shaped groove (groove)
60 Return spring 61 Friction part S Annular space G Gap

Claims (3)

Switching between an electric motor arranged in a power transmission path and an engaged state in which a rotating member capable of rotating integrally with the electric motor is engaged with a fixed member to lock the electric motor and a released state in which the lock is released In a drive device comprising a possible locking mechanism,
The lock mechanism uses the actuator that can shift from the released state to the engaged state with a predetermined power, and the torque generated in the rotating member after the transition from the released state to the engaged state. Self-locking means capable of maintaining the engaged state without the power of the actuator,
The self-locking means includes a first member that can rotate integrally with the rotating member, a second member that is coaxially disposed in a state of facing the first member, and each of the first member and the second member. An interposition member interposed between the first member and the second member in a state of being held in a groove formed on the opposing surface and gradually decreasing in depth in the rotation direction, and in the released state In this case, the second member is disposed so that a gap is formed between the second member and the friction portion stationary with respect to the fixed member, and after the transition from the disengaged state to the engaged state, a predetermined value is applied to the rotating member. A force in a direction to press the second member against the friction part when a torque in a direction is generated,
The actuator is configured to generate power that draws the second member to the friction portion and makes contact when the transition is made from the released state to the engaged state.
A drive device characterized by that . The self-locking means further includes urging means for urging the second member in a direction approaching the first member, and a negative torque in a direction opposite to the predetermined direction is applied to the rotating member in the engaged state. In this case, the force in the direction in which the second member is pressed against the friction portion is lost using the negative torque, and the urging means is used to shift from the engaged state to the released state. The drive device according to claim 1 , wherein the drive device is configured to be able to be operated. The power transmission path has an internal combustion engine and three rotating elements that can rotate differentially with each other, the internal combustion engine as one of these rotating elements, and the electric motor as the other element, claim the power distribution mechanism output member for driving the drive wheels of the vehicle to the remaining elements are connected respectively, and different from the motor and connected to said electric motor to said output member, are disposed 1 Or the drive device of 2 .

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