JP5915162B2 - Shift device - Google Patents

Description

  The present invention relates to a shift device.

2. Description of the Related Art Conventionally, there is known a shift device that includes a detent plate that has a plurality of fitting recesses on a peripheral surface and is rotatably supported, and switches a shift state of a transmission based on the rotation position.
For example, the shift device described in Patent Document 1 is a so-called shift-by-wire system in which a detent plate rotates by driving a motor. The detent plate includes a “P” range for operating a parking lock mechanism of a vehicle, and “Not- A plurality of fitting recesses corresponding to the “P (NP)” range (each shift position such as “R”, “N”, and “D”) are formed. In addition, the shift device is provided with a detent spring that is slidably contacted with the peripheral surface of the detent plate in an elastic state. When the detent spring is fitted into any of the fitting recesses, the rotation position of the detent plate, that is, the shift position is held.

  Further, when the shift position is switched, the fitting portion (roller) on the detent spring side is fitted so as to be dropped into each fitting recess (bottom portion) on the detent plate side based on the elastic force. Thus, accurate positioning can be performed without performing high-precision motor control. Thus, the manufacturing cost can be reduced by simplifying the rotation angle sensor, the control device, and the like.

JP 2008-39094 A

  However, a cogging torque exists in a magnet motor widely used as a drive motor. For this reason, at the time of the dropping operation as described above, there is a possibility that the motor (rotation) in a non-driven state cannot follow the detent plate rotated by the elastic force of the detent spring. In order to avoid this, when a special motor such as an SR motor (VR motor) without a cogging torque or a coreless motor is adopted, there is a problem that an increase in manufacturing cost is unavoidable. In that respect, there was still room for improvement.

  The present invention has been made to solve the above-described problems, and its purpose is to smoothly perform a dropping operation using the elastic force of the detent spring without being affected by the motor in a non-driven state. It is to provide a shift device that can be performed.

In order to solve the above problems, the invention according to claim 1 is a detent plate that has a plurality of fitting recesses on its peripheral surface and is rotatably supported, and transmits the motor rotation to the detent plate. A transmission mechanism, and a detent spring that holds the detent plate in a rotational position corresponding to the fitting recess by slidingly contacting the peripheral surface of the detent plate in an elastic state and engaging with any of the fitting recesses. The transmission mechanism rotates based on the rotation of the motor, has a screw-like member having a screw part on the inner periphery, and a screw part on the outer periphery, and is screwed on the screw-like member. with reciprocates in accordance with the direction of the motor rotation by being engaged, a movable body having a cylindrical portion having a first engagement portion and a second engagement portion provided at a distance from each other in the axial direction, and the Transfer A shaft-like part formed with an engaged part that is inserted into the cylindrical part of the body and engages with the first engaging part and the second engaging part as the moving body moves. And a transmission member capable of rotating the detent plate by moving in the axial direction integrally with the moving body based on the engagement of the engaged portion, and the moving body moves in the first direction . a first transmission state capable with said first engaging portion and the engaged portion is forward rotation movement of the detent plate caused by engagement with, together with the moving body moves in the second direction have a, a second transmission state can be reversed rotating the detent plate caused by said second engaging portion and the engaged portion are engaged, the boundary of the first transmission state A boundary between the corresponding first rotation position and the second transmission state As a buffer means for allowing free rotation of the detent plate between the corresponding second rotational position, between said engaged portion and the first engagement portion and the second engagement portion, The gist is that the axial gap is set .

  According to the above configuration, when a detent spring (fitting portion) is fitted to each fitting recess of the detent plate, the detent plate is freely rotated without accompanying motor rotation based on the elastic force of the detent spring. Can be made. As a result, the dropping operation using the elastic force of the detent spring can be smoothly performed without being affected by the motor in the non-driven state. This makes it possible to eliminate restrictions on selecting a motor, such as the magnitude of cogging torque, thereby simplifying the rotation angle sensor and control device, and reducing manufacturing costs. be able to.

According to the said structure, when a screw-shaped member rotates based on motor rotation, a moving body moves to an axial direction based on the screwing relationship (screw pair) with the screw-shaped member. Further, when the moving body moves in the axial direction, the engaged portion of the transmission member is engaged with either the first engaging portion or the second engaging portion according to the moving direction of the moving body. Thus, the transmission mechanism is in the first transmission state in which the detent plate can be rotated in the normal direction or the second transmission state in which the detent plate can be rotated in the reverse direction. Further, the transmission member freely moves within a range in which both are not engaged, based on an axial gap set between the engaged portion and the first engaging portion and the second engaging portion. be able to. Therefore, according to the above configuration, the motor rotates between the first rotation position corresponding to the boundary of the first transmission state and the second rotation position corresponding to the boundary of the second transmission state with a simple configuration. It is possible to form a buffer means that allows free rotation of the detent plate without accompanying.

  According to the said structure, a transmission member moves to an axial direction because the to-be-engaged part and the 1st engaging part or 2nd engaging part of a moving body engage. Based on the axial movement of the transmission member, the detent plate can be rotated in the forward or reverse direction by, for example, rotating a lever member provided on the rotation shaft of the detent plate. become. Further, the transmission member is free to axially move within a range in which the engaging member and the first engaging portion and the second engaging portion are not engaged with each other based on an axial gap set between the engaging portion and the first engaging portion and the second engaging portion. Can move. Thus, with a simple configuration, the detent is not accompanied by motor rotation between the first rotation position corresponding to the boundary of the first transmission state and the second rotation position corresponding to the boundary of the second transmission state. A buffer means for allowing free rotation of the plate can be formed.

According to a second aspect of the present invention, at least one of the engagement surface on the first engagement portion and the second engagement portion side and the engagement surface on the engaged portion side is formed to be curved, Is the gist.
According to a third aspect of the present invention, the engaged portion has a spherical engaging surface and is formed at two first positions in the axial direction sandwiching the movable body, and a second engaging protrusion. The gist of the present invention is that the curved surfaces constituting the first engaging portion and the second engaging portion are formed on both end surfaces in the axial direction of the movable body.

According to each said structure, the suitable engagement state between the to-be-engaged part of the transmission member and each engaging part by the side of a moving body can be ensured also at the time of tilting of a transmission member.
According to a fourth aspect of the present invention, the transmission member is connected to a lever member provided on a rotation shaft of the detent plate, and is inserted into the cylindrical portion of the movable body and the cylindrical portion. The gist is that a radial gap allowing tilting of the shaft-shaped portion is set between the shaft-shaped portion of the transmission member.

  According to the above configuration, the axial movement of the transmission member can be converted into the rotation of the detent plate with a simple configuration. Further, the transmission member is allowed to tilt in accordance with the rotation position of the lever member. As a result, the detent plate can be rotated more smoothly based on the axial movement of the transmission member.

  ADVANTAGE OF THE INVENTION According to this invention, the shift apparatus which can perform smoothly the dropping operation | movement using the elastic force of a detent spring, without being influenced by the motor in a non-driving state can be provided.

The perspective view which shows schematic structure of the shift apparatus in 1st Embodiment. The top view of a detent plate. The perspective view which shows schematic structure of a parking lock mechanism. The top view of the transmission mechanism in 1st Embodiment. Action | operation explanatory drawing of the transmission mechanism in 1st Embodiment. Action | operation explanatory drawing of the transmission mechanism in 1st Embodiment. Action | operation explanatory drawing of the shift apparatus concerning this invention. The perspective view which shows schematic structure of the shift apparatus in 2nd Embodiment. The principal part sectional drawing (AA cross section) of the transmission mechanism in 2nd Embodiment. The principal part sectional drawing (BB cross section) of the transmission mechanism in 2nd Embodiment. Explanatory drawing of an effect | action of the transmission mechanism in 2nd Embodiment. Explanatory drawing of an effect | action of the transmission mechanism in 2nd Embodiment. The perspective view which shows schematic structure of the shift apparatus in 3rd Embodiment. The top view of the transmission mechanism in 3rd Embodiment. Explanatory drawing of the effect | action of the transmission mechanism in 3rd Embodiment. Explanatory drawing of the effect | action of the transmission mechanism in 3rd Embodiment. The perspective view which shows schematic structure of the shift apparatus in 4th Embodiment. The top view of the transmission mechanism in 4th Embodiment. The principal part sectional drawing (CC cross section) of the transmission mechanism in 4th Embodiment. Explanatory drawing of the effect | action of the transmission mechanism in 4th Embodiment. Explanatory drawing of the effect | action of the transmission mechanism in 4th Embodiment. The top view which shows schematic structure of the slider and lever member of another example.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the shift device 1 includes a detent plate 3 that is rotatably supported and a detent spring 4 that holds the rotational position of the detent plate 3. The shift device 1 includes a motor 5 as a drive source and a transmission mechanism 7 that decelerates the rotation of the motor 5 and transmits it to the detent plate 3.

  That is, the shift device 1 of the present embodiment rotates the detent plate 3 by driving the motor. And it is comprised as what is called a shift-by-wire type shift device which can switch the shift state of a transmission based on the rotation position of the detent plate 3. FIG.

  Specifically, as shown in FIG. 2, the detent plate 3 is formed in a flat plate shape having a substantially fan-shaped outer shape. A rotation shaft 11 is provided at the base end 3 a of the detent plate 3. Specifically, as shown in FIG. 1, the rotation shaft 11 is fixed so as not to be relatively relative to the base end portion 3 a of the detent plate 3 in the thickness direction. The detent plate 3 can rotate integrally with the rotation shaft 11 with the rotation shaft 11 as an axis.

  On the other hand, the detent spring 4 is a long plate-like spring member having a fixed end 4a, and a roller 13 rotatably supported on the tip end portion 4b. A plurality of fitting recesses 14 are formed on the peripheral surface 12 on the distal end side of the detent plate 3. The detent spring 4 is disposed at a position where the roller 13 is in sliding contact with the peripheral surface 12 of the detent plate 3 in the elastic state.

  That is, when the detent plate 3 rotates, the roller 13 slides on the peripheral surface 12. The detent spring 4 can hold the detent plate 3 at the rotational position corresponding to the fitting recess 14 by fitting the roller 13 into any of the fitting recesses 14. ing.

  As shown in FIGS. 1 and 2, the base end 3 a of the detent plate 3 is provided with an output portion 16 that transmits the rotation of the detent plate 3 to the transmission. Specifically, the output portion 16 is formed in a plate shape extending in a direction (left side in the figure) substantially orthogonal to the longitudinal direction of the detent plate 3 (see FIG. 2, vertical direction). The rotation of the detent plate 3 is transmitted to the transmission via the output unit 16.

  Specifically, the shift device 1 of the present embodiment is connected to a parking lock mechanism that can prohibit the movement of a vehicle that is stopped. Based on the rotation of the detent plate 3, the operation of the parking lock mechanism, that is, the parking state (“P” range) and the non-parking state (“NP” range) can be switched.

  As shown in FIG. 3, the parking lock mechanism 20 includes a parking gear 22 having a lock portion 21 having a plurality of lock teeth 21 a formed on the peripheral surface, and rotation of the parking gear 22 by engaging with the lock portion 21. And a lock pole 23 that can regulate the above.

  The parking gear 22 is fixed so as not to rotate relative to a crankshaft of an engine (not shown). The lock pawl 23 has an engaging claw 24 facing each lock tooth 21 a and is disposed on the same plane as the lock portion 21 of the parking gear 22. The lock pawl 23 is configured to be engaged and disengaged with respect to the lock portion 21 by rotating around the rotation shaft 25 provided at the base end portion 23a. .

  That is, the lock pawl 23 rotates in the direction approaching the parking gear 22 and the engaging claw 24 engages with the lock portion 21, whereby the rotation of the parking gear 22 is restricted. Then, the parking lock mechanism 20 makes it impossible to rotate the crankshaft (not shown), thereby prohibiting the movement of the vehicle.

  More specifically, the parking lock mechanism 20 includes a park rod 26 that reciprocates in the axial direction based on the rotation of the detent plate 3. The parking lock mechanism 20 is controlled in its parking state and non-parking state based on the axial movement of the park rod 26.

  Specifically, the base end portion 26a of the park rod 26 is formed to be bent in a crank shape. Further, as shown in FIG. 1, a through hole 16 a is formed in the output portion 16 of the detent plate 3. That is, the park rod 26 is rotatably connected to the output portion 16 by inserting the base end portion 26a through the through hole 16a. Thus, the park rod 26 reciprocates in the axial direction based on the rotation of the detent plate 3.

  Further, as shown in FIG. 3, a control cam 27 having a tapered surface 27a that tapers toward the distal end in the axial direction is provided at the distal end of the park rod 26 so as to be movable in the axial direction. The park rod 26 is disposed at a position where the tapered surface 27 a of the control cam 27 is in sliding contact with the pressing portion 28 provided at the tip of the lock pole 23.

  Specifically, the taper surface 27a of the control cam 27 of the park rod 26 is pressed from the back surface side of the lock pole 23, that is, the side surface 23d side opposite to the side surface 23c on the side where the engagement claw 24 is provided. It arrange | positions in the position contact | abutted to the part 28. FIG. The park rod 26 is fitted with a coil spring 29. The control cam 27 is configured such that the tapered surface 27 a elastically contacts the pressing portion 28 based on the elastic force of the coil spring 29.

  That is, the lock pole 23 is guided by the taper surface 27a of the control cam 27 slidably in contact with the back side (side surface 26d) thereof when the park rod 26 moves in the axial direction based on the rotation of the detent plate 3. It rotates in a direction close to the parking gear 22 or a direction away from the parking gear 22. Specifically, the lock pole 23 rotates in the direction close to the parking gear 22 when the park rod 26 moves in the protruding direction (the direction from the left side to the right side in FIG. 3), and the park rod 26 is immersed. By moving in the direction (the direction from the right side to the left side in FIG. 3), it rotates in a direction away from the parking gear 22. In this embodiment, the parking state and the non-parking state of the parking lock mechanism 20 are thereby switched.

  On the other hand, as shown in FIG. 2, two fitting recesses 14 a and 14 b corresponding to the parking state and the non-parking state of the parking lock mechanism 20 as described above are formed on the peripheral surface 12 of the detent plate 3. .

  Specifically, in the present embodiment, in the drawing, the fitting recess 14a located on the left side corresponds to the parking state, and the fitting recess 14b located on the right side corresponds to the non-parking state. Further, the circumferential shape of the detent plate 3 is such that when the bottom portions P1, P2 of these two fitting recesses 14a, 14b are the lowest point, the sliding contact surface S between them is radially outward (the upper side in the figure). ) To protrude into a mountain shape. Furthermore, the apex P0 of the slidable contact surface S having the mountain shape is set at a position biased toward the fitting recess 14a corresponding to the parking state. As a result, the sliding contact surface S has a steep slope on the side of the fitting recess 14a.

  The shift device 1 according to the present embodiment transmits the rotation of the motor 5 to the rotation shaft 11 of the detent plate 3 via the transmission mechanism 7, thereby moving the detent plate 3 in the normal rotation direction according to the rotation direction of the motor 5. Or rotate in the reverse direction. In this embodiment, the direction in which the roller 13 slidably contacting the peripheral surface 12 is moved toward the fitting recess 14a (clockwise direction in the figure) is “forward rotation (forward rotation)”. It has become. The direction in which the roller 13 is moved to the fitting recess 14b side (counterclockwise direction in the figure) is the “rotation in the reverse direction (reverse rotation)” of the detent spring 4.

  That is, when the detent plate 3 rotates in the forward direction, the roller 13 of the detent spring 4 apparently moves on the sliding contact surface S from the fitting recess 14b side toward the fitting recess 14a side. Further, as the detent plate 3 rotates in the reverse direction, the roller 13 apparently moves on the sliding contact surface S from the fitting recess 14a side toward the fitting recess 14b side.

  The shift device 1 according to the present embodiment allows the roller 13 of the detent spring 4 to be either the fitting recess 14a corresponding to the parking state or the fitting recess 14b corresponding to the non-parking state by such rotation of the detent plate 3. To fit. The parking lock mechanism 20 can be maintained in the parking state or the non-parking state by holding the rotational position of the detent plate 3 based on the fitting between the roller 13 and the fitting recess 14. .

  Here, in the shift device 1 of the present embodiment, when switching between the parking state and the non-parking state, the roller 13 on the sliding contact surface S is at a position exceeding the vertex P0 between the fitting recesses 14a and 14b. Until it moves, the detent plate 3 is rotated by driving the motor (see FIG. 2). Then, after stopping the motor rotation, the detent plate 3 is further rotated using the elastic force of the detent spring 4.

  That is, the roller 13 of the detent spring 4 moves to the lowest point (bottom portions P1, P2) so as to slide down on the sliding contact surface S by the further rotation of the detent plate 3. The transmission mechanism 7 according to the present embodiment allows free rotation of the detent plate 3 without motor rotation within a predetermined range so that the dropping operation using the elastic force of the detent spring 4 can be smoothly performed. Shock absorbing means is provided.

  More specifically, as shown in FIG. 1, the transmission mechanism 7 of this embodiment includes a trapezoidal screw 32 as a screw-like member that rotates based on motor rotation, and a slider as a moving body that is screwed to the trapezoidal screw 32. 33.

  The trapezoidal screw 32 has a known configuration in which an axial shape is formed and a screw portion 32a is formed on the outer periphery. The trapezoidal screw 32 is rotatably supported in a state in which axial movement is restricted by both ends of the trapezoidal screw 32 being pivotally supported by the bearings 34 and 35. On the other hand, the slider 33 has a substantially rectangular parallelepiped outer shape extending in the axial direction of the trapezoidal screw 32. The slider 33 is configured to reciprocate in the axial direction according to the rotation direction of the motor 5 based on the screwing relationship (screw pair) with the trapezoidal screw 32.

  The transmission mechanism 7 includes a lever member 36 that converts the axial movement of the slider 33 into the rotation of the detent plate 3. Specifically, the base end portion 36 a of the lever member 36 is fixed to the rotation shaft 11 of the detent plate 3 so as not to be relatively rotatable. Further, the distal end portion 36 b of the lever member 36 is adapted to engage with the slider 33 when the slider 33 moves in the axial direction. Then, the transmission mechanism 7 of the present embodiment can rotate the detent plate 3 in the normal rotation direction or the reverse rotation direction by rotating the lever member 36 according to the moving direction of the slider 33 based on the engagement relationship. It is possible.

  More specifically, on the upper surface 33a of the slider 33, there are formed a first engaging portion 37 and a second engaging portion 38 in the form of protrusions that are provided at both ends in the longitudinal direction and are spaced apart in the axial direction. ing. The distal end portion 36b of the lever member 36 is provided with an engaged portion 39 disposed with a gap X in the axial direction between the first engaging portion 37 and the second engaging portion 38.

  Specifically, as shown in FIG. 4, the engaged portion 39 is formed in a disc shape, and the diameter D <b> 1 is the interval between the first engaging portion 37 and the second engaging portion 38 in the axial direction. The diameter is set smaller than D2. Thus, the engaged portion 39 is engaged with either the first engaging portion 37 or the second engaging portion 38 as the slider 33 moves in the axial direction based on the motor rotation. Yes.

  That is, as shown in FIG. 5, when the slider 33 moves in the first direction (the direction from the left side to the right side in the drawing) based on the motor rotation, the engaged portion 39 of the lever member 36 is moved to the first direction. Engage with the engaging portion 37. Further, based on the engagement with the first engaging portion 37, the engaged member 39 moves in the first direction together with the slider 33, so that the lever member 36 rotates (clockwise direction in the figure). . And thereby, the transmission mechanism 7 will be in the 1st transmission state which can rotate the detent plate 3 by forward rotation.

  Also, as shown in FIG. 6, the engaged portion 39 of the lever member 36 is moved in the second direction by moving the slider 33 in the second direction (the direction from the right side to the left side in the drawing) based on the motor rotation. Engage with the engaging portion 38. Further, based on the engagement with the second engagement portion 38, the engaged portion 39 moves in the second direction together with the slider 33, so that the lever member 36 rotates (in the same figure, the counterclockwise direction). ). As a result, the transmission mechanism 7 enters a second transmission state in which the detent plate 3 can be rotated in the reverse direction.

  Furthermore, as shown in FIG. 4, the axial gap X is set between the first engaging portion 37 and the second engaging portion 38 and the engaged portion 39, so that the lever member 36 The engaged portion 39 can freely rotate within a range in which the engaged portion 39 does not engage with the first engaging portion 37 and the second engaging portion 38. In this embodiment, the detent without motor rotation between the first rotation position corresponding to the boundary of the first transmission state and the second rotation position corresponding to the boundary of the second transmission state is thereby achieved. A buffer means for allowing free rotation of the plate 3 is formed.

Next, the operation of the shift device of this embodiment will be described.
As shown in FIG. 7, for example, when the parking lock mechanism 20 is switched to the parking state, the detent plate 3 is rotated in the forward direction (clockwise in FIG. 7) based on the motor rotation transmitted through the transmission mechanism 7. Direction). Then, the roller 13 of the detent spring 4 is fitted into the fitting recess 14a formed in the peripheral surface 12 and the rotation position of the detent plate 3 is maintained, so that the parking state of the parking lock mechanism 20 is maintained. The

  At this time, the detent plate 3 is rotated in the forward rotation direction by the motor until the roller 13 slidably contacting the peripheral surface 12 moves to the slidable contact position Px exceeding the apex P0 between the fitting recesses 14a and 14b. . The sliding contact position Px exceeding the apex P0 is a position corresponding to the rotational position of the detent plate 3 that can be controlled by driving the motor, specifically, the bottom of the fitting recess 14a corresponding to the accuracy of the motor control. It is set at an arbitrary position close to P1.

  Further, after the motor rotation is stopped, the detent plate 3 is further rotated in the normal rotation direction by the elastic force of the detent spring 4. Then, the roller 13 on the slidable contact surface S moves to the bottom P1 of the fitting recess 14a that is the lowest point so as to slide down from the slidable contact position Px when the motor is stopped.

  That is, as shown in FIG. 5, the transmission mechanism 7 moves in the first direction of the slider 33 by moving the slider 33 in the first direction based on the motor rotation until the roller 13 moves to the sliding contact position Px. The engaging portion 37 and the engaged portion 39 of the lever member 36 are in an engaged state. Thus, the rotation of the detent plate 3 in the reverse direction is restricted, so that the first transmission state in which the detent plate 3 can be rotated forward is maintained.

  However, with respect to further rotation in the forward rotation direction, the axial direction set between the first engagement portion 37 and the second engagement portion 38 of the slider 33 and the engaged portion 39 of the lever member 36 is used. It is allowed within the range of the gap X. Therefore, after the motor rotation is stopped, the detent plate 3 is further rotated forward based on the elastic force of the detent spring 4, so that the engaged state of the engaged portion 39 and the first engaging portion 37, that is, the first 1 The transmission state is released.

  That is, as shown in FIG. 7, the rotation position of the detent plate 3 at the time when the motor rotation is stopped (sliding contact position Px) becomes the first rotation position C1 corresponding to the boundary of the first transmission state. Further, when it is assumed that the detent plate 3 continues to rotate in the forward direction after the motor rotation is stopped, the transmission mechanism 7 includes the engaged portion 39 of the lever member 36 and the second engaging portion 38 of the slider 33. Is engaged, that is, the second transmission state in which the detent plate 3 can be rotated in the reverse direction (see FIG. 6). Then, the rotation position of the detent plate 3 at this time (sliding contact position Px ′) becomes the second rotation position C2 corresponding to the boundary of the second transmission state.

  The shift device 1 of the present embodiment allows the free rotation of the detent plate 3 without the motor rotation between the first rotation position C1 and the second rotation position C2. And it is the structure which ensures the smooth drop operation | movement at the time of fitting the roller 13 to each fitting recessed part 14a, 14b by this.

  Note that switching the parking lock mechanism 20 to the non-parking state is the same as switching to the parking state except that the detent plate 3 is rotated in the reverse rotation direction (see FIG. 3, counterclockwise direction). Is performed. For this reason, the description of the operation when switching to the non-parking state is omitted.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The shift device 1 includes a transmission mechanism 7 that transmits the rotation of the motor 5 to the detent plate 3. The transmission mechanism 7 includes a slider 33 that reciprocates in accordance with the direction of motor rotation, and a first transmission state in which the detent plate 3 that is generated when the slider 33 moves in the first direction can be rotated forward. And a second transmission state in which the detent plate 3 generated by the movement of the slider 33 in the second direction can be rotated in the reverse direction. Then, the transmission mechanism 7 allows the detent plate 3 to freely rotate between the first rotation position C1 corresponding to the boundary of the first transmission state and the second rotation position C2 corresponding to the boundary of the second transmission state. Provided with acceptable buffering means.

  According to the above configuration, when the roller 13 of the detent spring 4 is fitted into the fitting recesses 14 a and 14 b of the detent plate 3, the detent plate 3 is not accompanied by motor rotation based on the elastic force of the detent spring 4. Can be freely rotated. As a result, the drop operation using the elastic force of the detent spring 4 can be smoothly performed without being affected by the motor 5 in the non-driven state. As a result, it becomes possible to eliminate restrictions when selecting the motor 5 such as the magnitude of the cogging torque, thereby simplifying the rotation angle sensor and the control device and reducing the manufacturing cost. Can be planned.

  (2) The transmission mechanism 7 includes a trapezoidal screw 32 that rotates based on the rotation of the motor, and the slider 33 is screwed to the trapezoidal screw 32, so that the motor 5 is based on the screwing relationship (screw pair). It reciprocates in the axial direction according to the rotation direction. In addition, on the upper surface 33 a of the slider 33, a protruding first engaging portion 37 and a second engaging portion 38 that are spaced apart in the axial direction are formed. The transmission mechanism 7 has an engaged portion 39 that is disposed with a gap X in the axial direction between the first engaging portion 37 and the second engaging portion 38, and the rotation shaft of the detent plate 3. 11 is provided.

  That is, when the slider 33 moves in the axial direction based on the rotation of the motor, the engaged portion 39 of the lever member 36 has the first engaging portion 37 or the second engaging portion 38 in accordance with the moving direction of the slider 33. Engage with either. As a result, the transmission mechanism 7 enters a first transmission state in which the detent plate 3 can be rotated in the normal direction or a second transmission state in which the detent plate 3 can be rotated in the reverse direction. In addition, since the axial gap X is set between the first engaging portion 37 and the second engaging portion 38 and the engaged portion 39, the lever member 36 has the engaged portion 39 in the first engaging portion 39. The first engaging portion 37 and the second engaging portion 38 can be freely rotated within a range where they are not engaged. Therefore, according to the above configuration, between the first rotation position C1 corresponding to the boundary of the first transmission state and the second rotation position C2 corresponding to the boundary of the second transmission state with a simple configuration. A buffer means for allowing free rotation of the detent plate 3 without motor rotation can be formed.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. Note that this embodiment is different from the first embodiment only in the configuration of the transmission mechanism. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 8, in the present embodiment, a substantially cylindrical case 41 is provided at one end of the motor 5. Then, the transmission mechanism 40 is screwed into the screw-like member 42 and the screw-like member 42 that is rotated by driving the motor in the case 41, so that the motor 5 has a screw-on relationship (screw pair). And a moving body 43 that reciprocates in the axial direction according to the rotation direction.

  More specifically, as shown in FIG. 9, the screw-like member 42 is formed in a long and substantially cylindrical shape having a screw portion 42a on the inner periphery. Further, the screw-like member 42 is disposed along the axis of the case 41 in a state where one end in the axial direction is fixed to the output portion (not shown) of the motor 5. The rotational output of the motor 5 is decelerated by a planetary gear (not shown) arranged coaxially with the motor 5 and output from the output unit of the motor 5. The screw-like member 42 is rotatably supported by a bearing (not shown) provided in the case 41.

  On the other hand, the moving body 43 is formed in a substantially cylindrical shape having a screw portion 43a on the outer periphery. The moving body 43 is adapted to move in the axial direction in the cylinder according to the rotational direction of the screw member 42 by being screwed to the screw member 42.

  As shown in FIG. 8, the transmission mechanism 40 includes a shaft-shaped transmission member 45 that is inserted into the cylinder of the moving body 43, and the moving body 43 is connected to the transmission member 45 based on motor rotation. A pair of engaging protrusions 48a and 48b that engage with the axial end faces 46 and 47 by moving in the direction are provided. The transmission member 45 is connected to a lever member 49 provided on the rotating shaft 11 of the detent plate 3 by the tip 45a protruding from the tip 41a of the case 41.

  Specifically, the tip 45a of the transmission member 45 is formed to be bent in a substantially L shape. The transmission member 45 is rotatably connected to the lever member 49 by inserting the bent portion into a through hole 49 a formed at the tip of the lever member 49.

  The transmission member 45 has a flat plate portion (width across flats) 45b, and the insertion hole 50 formed in the tip portion 41a of the case 41 has a square hole portion (not shown) that matches the shape of the flat plate portion 45b. ) Is provided. As shown in FIGS. 8 and 10, the movable body 43 and the insertion portion 45 c of the transmission member 45 inserted into the cylinder are engaged with the movable body 43 by engaging in the circumferential direction, respectively. Detents 51 and 52 having a so-called two-sided width structure that restricts relative rotation with the transmission member 45 are formed. And in this embodiment, the accompanying rotation of the mobile body 43 accompanying rotation of the screw-shaped member 42 is suppressed by this.

  Further, as shown in FIG. 9, the engagement protrusions 48 a and 48 b are separated in the axial direction with the moving body 43 interposed therebetween so that an axial gap X is formed between the engaging protrusions 48 a and 48 b. It is formed in two positions. Then, as shown in FIG. 10, the radial direction that allows the transmission member 45 to tilt between the movable body 43 and the transmission member 45 (the insertion portion 45 c) inserted into the cylinder of the movable body 43. A gap Y is set.

  More specifically, as shown in FIG. 9, each of the engaging protrusions 48a and 48b has an engaging surface 53 that is curved in a convex shape. Specifically, the engagement surface 53 of each engagement protrusion 48a, 48b is formed in a substantially spherical shape. And the axial direction end surfaces 46 and 47 used as the engaging surface by the side of the mobile body 43 are the concave curved surfaces 54 corresponding to the spherical shape of each corresponding engaging protrusion 48a, 48b, respectively.

  That is, when the moving body 43 moves in the axial direction based on the rotation of the motor, any one of the engaging protrusions 48a and 48b provided on the transmission member 45 becomes the axial end surface of the moving body 43 facing the axial direction. 46 and 47 are engaged. Further, when the moving body 43 further moves, the transmission member 45 moves in the axial direction integrally with the moving body 43 based on the engagement with the engaging protrusions 48a and 48b.

  The transmission mechanism 40 of the present embodiment rotates the lever member 49 based on the axial movement of the transmission member 45. Thus, the detent plate 3 can be rotated in the normal rotation direction or the reverse rotation direction in accordance with the rotation direction of the motor 5.

  Specifically, as shown in FIG. 11, when the moving body 43 moves in the first direction (the direction from the left side to the right side in the figure) based on the motor rotation, it is transmitted to the axial end face 46. The engagement protrusion 48a of the member 45 is engaged. As a result of this engagement, the transmission member 45 moves in the first direction together with the moving body 43, and its tip 45a moves in the protruding direction, so that the transmission mechanism 40 moves in the direction in which the detent plate 3 rotates in the forward direction. The lever member 49 can be operated.

  Further, as shown in FIG. 12, the moving body 43 moves in the second direction (the direction from the right side to the left side in the figure) based on the motor rotation, so that the transmission member 45 is moved with respect to the axial end surface 47. The engagement protrusion 48b is engaged. As a result of this engagement, the transmission member 45 moves in the second direction together with the moving body 43, and its tip 45a moves in the immersion direction, so that the transmission mechanism 40 moves in the direction of rotating the detent plate 3 in the reverse direction. The lever member 49 can be operated.

  That is, in the present embodiment, the axial end surfaces 46 and 47 of the moving body 43 constitute a first engaging portion and a second engaging portion, respectively, and the engaging protrusions that engage with the axial end surfaces 46 and 47, respectively. The portions 48a and 48b constitute engaged portions on the transmission member 45 side. The transmission mechanism 40 is in the first transmission state in which the detent plate 3 can be rotated in the forward direction by the axial end surface 46 of the moving body 43 and the engagement protrusion 48a of the transmission member 45 engaging with each other. Thus, when the axial end surface 47 of the moving body 43 and the engagement protrusion 48b of the transmission member 45 are engaged, a second transmission state is achieved in which the detent plate 3 can be rotated in the reverse direction.

  Further, the axial gap X is set between the axial end faces 46 and 47 of the moving body 43 and the engaging projections 48a and 48b of the transmission member 45, so that the transmission member 45 has its engagement. The mating protrusions 48a and 48b can freely move in the axial direction within a range where they do not engage with the axial end faces 46 and 47 of the moving body 43 (see FIG. 9). In the present embodiment, this causes rotation of the motor between the first rotation position C1 corresponding to the boundary of the first transmission state and the second rotation position C2 corresponding to the boundary of the second transmission state. A buffer means for allowing free rotation of the detent plate 3 is formed (see FIG. 7).

  As described above, according to the present embodiment, it is possible to obtain the same effects as those of the first embodiment. In addition, the transmission member 40 that moves in the axial direction integrally with the moving body 43 is configured to rotate the lever member 49 provided on the rotation shaft 11 of the detent plate 3 so that the transmission mechanism 40 is compactly assembled. Is possible. Furthermore, by setting a radial gap that allows tilting of the transmission member 45 between the movable body 43 and the transmission member 45 inserted into the cylinder of the movable body 43, the lever member 49 can be moved more smoothly. It can be rotated. Then, the engaging surfaces 53 of the engaging protrusions 48a and 48b are formed to be convexly curved, and the axial end surfaces 46 and 47 serving as the engaging surfaces on the movable body 43 side are formed as curved surfaces 54. Even when the transmission member 45 is tilted, it is possible to ensure a suitable engagement state between the engagement protrusions 48a and 48b of the transmission member 45 and the axial end surfaces 46 and 47 on the movable body 43 side. it can.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. Note that this embodiment is different from the first embodiment only in the configuration of the transmission mechanism. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 13 and 14, the transmission mechanism 60 of the present embodiment includes a rotating shaft 61 that rotates based on motor rotation, and a screw that is not rotatable relative to the rotating shaft 61 and is movable in the axial direction. And a worm gear 62 as a member.

  The rotating shaft 61 is rotatably supported by bearings 63 and 64 at both ends in the axial direction. Further, an external gear 65 is provided next to the bearing 63 on the axial center side (right side in FIG. 14). The rotation of the motor 5 is transmitted to the rotary shaft 61 via the external gear 65.

  A spline 66 is formed on the outer periphery of the rotating shaft 61, and the worm gear 62 is splined to the rotating shaft 61. Further, a gap X in the axial direction is set between the worm gear 62 and the bearing 64 and the external gear 65 which are in a positional relationship facing each other in the axial direction. Thus, the worm gear 62 is coaxially rotated integrally with the rotary shaft 61 and is allowed to move in the axial direction between the external gear 65 as the first restriction wall and the bearing 64 as the second restriction wall. Yes.

  Further, the transmission mechanism 60 includes a lever member 69 having gear teeth 68 that mesh with the worm teeth 67 of the worm gear 62. The lever member 69 is fixed so as not to rotate relative to the rotation shaft 11 of the detent plate 3.

  Specifically, the lever member 69 is formed in a plate shape having a substantially fan-shaped outer shape, and its base end portion 69 a is fixed to the rotating shaft 11 of the detent plate 3. And the gear tooth 68 is provided in the surrounding surface of the front-end | tip part 69b formed in the circular arc shape.

  That is, the lever member 69 rotates by rotating the worm gear 62 based on the motor rotation and transmitting the motor torque based on the screw engagement between the gear teeth 68 and the worm teeth 67. The transmission mechanism 60 according to the present embodiment causes the lever member 69 to rotate integrally with the rotation shaft 11 of the detent plate 3 so that the detent plate 3 is rotated in the normal rotation direction or according to the rotation direction of the motor 5. It can be rotated in the reverse direction.

  Next, the operation of the transmission mechanism 60 of this embodiment will be described. In the following description, in FIG. 14, the direction from the right side to the left side is the first direction, and the direction from the left side to the right side is the second direction.

  In the transmission mechanism 60 of the present embodiment, the lever member 69 is rotated in the direction in which the detent plate 3 is rotated forward by the motor torque in the first rotation direction (see FIG. 14) being transmitted through the worm gear 62. When the motor torque in the second rotation direction (see FIG. 14) is transmitted, the detent plate 3 is rotated in the reverse rotation direction.

  Here, the worm gear 62 can move in the axial direction on the rotating shaft 61, and an axial gap X is set between the bearing 64 and the external gear 65 facing the axial direction. For this reason, the worm gear 62 rotates integrally with the rotating shaft 61 by driving the motor, whereby the axially facing bearing 64 is based on screw engagement between the worm teeth 67 and the gear teeth 68 of the lever member 69. It moves on the rotating shaft 61 in the axial direction until it abuts on the side surface 64a of the external gear 65 or the side surface 65a of the external gear 65.

  Specifically, as shown in FIG. 15, the worm gear 62 moves axially on the rotation shaft 61 in the first direction when the rotation shaft 61 rotates in the first rotation direction. The axial movement of the detent plate 3 is restricted by the external gear 65 serving as the first restriction wall, so that the motor torque in the direction of rotating the detent plate 3 in the forward direction can be transmitted to the lever member 69.

  Further, as shown in FIG. 16, the worm gear 62 moves axially on the rotation shaft 61 in the second direction when the rotation shaft 61 rotates in the second rotation direction. Then, by restricting the movement in the axial direction by the bearing 64 as the second restriction wall, it is possible to transmit the motor torque in the direction of rotating the detent plate 3 in the reverse direction to the lever member 69.

  That is, in this embodiment, the worm gear 62 as a screw-like member constitutes a “moving body that reciprocates according to the motor rotation direction”, and the lever member 69 converts “the rotation of the screw-like member into the rotation of the detent plate”. Possible conversion means ”. The transmission mechanism 60 is in the “first transmission state in which the detent plate 3 can be rotated in the normal direction” when the worm gear 62 abuts against the side surface 65 a of the external gear 65, and the worm gear 62 is in the side surface of the bearing 64. By abutting on 64a, a “second transmission state in which the detent plate 3 can be rotated in the reverse direction” is established.

  Further, when the motor rotation is stopped, the worm gear 62 is connected to the bearing 64 and the external gear 65 by rotating the lever member 69 in the screw engagement state together with the detent plate 3. Based on the axial gap X set between them, the rotary shaft 61 is moved in the axial direction without the rotation of the rotary shaft 61.

  Specifically, as shown in FIG. 15, when the motor rotation is stopped and the first transmission state is set, the worm gear 62 is rotated by the rotation of the detent plate 3 further rotating forward. Move on the shaft 61 in the second direction. Further, as shown in FIG. 16, when the motor rotation is stopped and in the second transmission state, the worm gear 62 is rotated on the rotating shaft 61 where the rotation has been stopped by the reverse rotation of the detent plate 3. Is moved in the first direction. In the present embodiment, this causes rotation of the motor between the first rotation position C1 corresponding to the boundary of the first transmission state and the second rotation position C2 corresponding to the boundary of the second transmission state. A buffer means for allowing free rotation of the detent plate 3 is formed (see FIG. 7).

  That is, when the parking lock mechanism 20 is switched to the parking state, the detent plate 3 is further rotated in the forward direction based on the elastic force of the detent spring 4 without the rotation of the rotating shaft 61 after the motor rotation is stopped. be able to. Similarly, when the parking lock mechanism 20 is switched to the non-parking state, the detent plate 3 can be further rotated in the reverse direction without the rotation of the rotating shaft 61. In this embodiment, as in the above-described embodiments, when the roller 13 of the detent spring 4 is fitted into the fitting recesses 14a and 14b of the detent plate 3, the motor 5 in the non-driven state is A smooth drop operation utilizing the elastic force of the detent spring 4 can be performed without being affected.

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. The present embodiment is different from the above embodiments only in the configuration of the transmission mechanism. Therefore, the same components as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 17 to 19, the transmission mechanism 70 of the present embodiment is similar to the transmission mechanism 60 of the third embodiment in that the both ends in the axial direction are rotatably supported by bearings 63 and 64. 71 and a trapezoidal screw 75 as a screw-like member provided so as not to rotate relative to the rotating shaft 71 and to be movable in the axial direction.

  The trapezoidal screw 75 is spline-fitted to the rotating shaft 71 as in the worm gear 62 in the third embodiment. Further, the rotation shaft 71 is not provided with a rotation transmission member corresponding to the external gear 65 in the third embodiment. A gap X in the axial direction is set between the trapezoidal screw 75 and the bearings 63 and 64 that are in a positional relationship facing each other in the axial direction.

That is, the trapezoidal screw 75 rotates coaxially integrally with the rotary shaft 61 and is allowed to move in the axial direction between the bearings 63 and 64 serving as the first restriction wall and the second restriction wall.
The transmission mechanism 70 is fixed to the slider 76 screwed to the trapezoidal screw 75 and the rotation shaft 11 of the detent plate 3 so as not to rotate relative to each other, and the distal end portion 36 b is rotatable relative to the slider 76. And a lever member 36 connected to each other.

  Specifically, a pair of engaging protrusions 77a and 77b are formed on the upper surface 76a of the slider 76 so as to be spaced apart from each other in the axial direction. Then, the lever member 36 is rotatably connected to the slider 76 by engaging the engaged portion 39 provided at the distal end portion 36b so as to be sandwiched between the engaging protrusions 77a and 77b. Has been.

  In other words, in the present embodiment, the screw portion 78 of the slider 76 constitutes a “screw engaging portion” for the screw portion 79 of the trapezoidal screw 75 as a screw-like member. Further, no axial gap is set between the engaging protrusions 77a and 77b and the engaged portion 39. The transmission mechanism 70 of the present embodiment is configured to convert the rotation of the trapezoidal screw 75 based on the rotation of the motor into the rotation of the detent plate 3 using the slider 76 and the lever member 36 as conversion means.

  Next, the operation of the transmission mechanism 70 of this embodiment will be described. In the following description, in FIG. 18, the direction from the right side to the left side is the first direction, and the direction from the left side to the right side is the second direction.

  In the transmission mechanism 70 of the present embodiment, the slider 76 moves in the second direction when the motor torque in the first rotation direction (see FIG. 18) is transmitted via the trapezoidal screw 75, and the second rotation direction (see FIG. 18)) is transmitted in the first direction. Then, the lever member 36 rotates in the direction in which the detent plate 3 is rotated in the forward direction when the slider 76 moves in the second direction, and the detent plate 3 is rotated in the reverse direction when the slider 76 moves in the first direction. It rotates in the direction of movement.

  Here, the trapezoidal screw 75 is movable in the axial direction on the rotating shaft 71 and is axially disposed between the bearings 63 and 64 as the first and second regulating walls opposed to the axial direction. The gap X is set. For this reason, the trapezoidal screw 75 rotates integrally with the rotary shaft 71 by driving the motor, so that each of the bearings 63 and 64 facing in the axial direction thereof is based on the screwing relationship (screw pair) with the slider 76. It moves on the rotating shaft 71 in the axial direction until it contacts the side surfaces 63a, 64a.

  Specifically, as shown in FIG. 20, the trapezoidal screw 75 moves in the axial direction on the rotation shaft 71 in the first direction as the rotation shaft 71 rotates in the first rotation direction. The trapezoidal screw 75 transmits the motor torque to the slider 76 in such a direction that the slider 76 is moved in the second direction, that is, the detent plate 3 is rotated in the forward direction by restricting the axial movement thereof by the bearing 63. It becomes possible.

  Further, as shown in FIG. 21, the trapezoidal screw 75 moves in the second direction on the rotation shaft 71 when the rotation shaft 71 rotates in the second rotation direction. Then, by restricting the movement in the axial direction by the bearing 64, it is possible to transmit the motor torque in the direction in which the slider 76 is moved in the first direction, that is, the detent plate 3 is rotated in the reverse direction to the slider 76. .

  That is, in the present embodiment, the bearing 63 constitutes the first restriction wall, and the bearing 64 constitutes the second restriction wall. Further, the trapezoidal screw 75 as a screw-like member constitutes “a moving body that reciprocates according to the motor rotation direction”, and the slider 76 constitutes “a second screw-like member screwed to the screw-like member”. The transmission mechanism 70 is in the “first transmission state in which the detent plate 3 can be rotated in the normal direction” when the trapezoidal screw 75 comes into contact with the side surface 63 a of the bearing 63, and the trapezoidal screw 75 is connected to the side surface of the bearing 64. By abutting on 64a, a “second transmission state in which the detent plate 3 can be rotated in the reverse direction” is established.

  When the motor rotation is stopped, the trapezoidal screw 75 rotates with the lever member 36 integrally with the detent plate 3, and the slider 76 coupled to the lever member 36 and the both bearings 63. , 64 based on the axial gap X set between the rotary shaft 71 and the rotary shaft 71 without causing the rotary shaft 71 to rotate.

  Specifically, as shown in FIG. 20, when the motor rotation is stopped and the first transmission state is established, the trapezoidal screw 75 and the slider 76 rotate when the detent plate 3 further rotates forward. Moves in the second direction on the rotating shaft 71 stopped. Further, as shown in FIG. 21, when the motor rotation is stopped and the second transmission state is set, the rotation of the trapezoidal screw 75 and the slider 76 is stopped by the further reverse rotation of the detent plate 3. It moves on the rotating shaft 71 in the first direction. In the present embodiment, this causes rotation of the motor between the first rotation position C1 corresponding to the boundary of the first transmission state and the second rotation position C2 corresponding to the boundary of the second transmission state. A buffer means for allowing free rotation of the detent plate 3 is formed (see FIG. 7).

As described above, according to the present embodiment, the same effects as those of the above embodiments can be obtained.
In addition, you may change each said embodiment as follows.
In each of the above embodiments, two fitting recesses 14 a and 14 b corresponding to the parking state and the non-parking state of the parking lock mechanism 20 are formed on the peripheral surface 12 of the detent plate 3. However, the present invention is not limited to this, and may be embodied to have a plurality of fitting recesses corresponding to each shift position in the “Not-P (NP)” range, such as “R”, “N”, and “D”.

  In the first embodiment, the upper surface 33a of the slider 33 is provided with the projecting first engaging portion 37 and the second engaging portion 38 that are spaced apart from each other in the axial direction. In other words, an engaged portion 39 is provided between the first engaging portion 37 and the second engaging portion 38 with an axial gap X therebetween.

  However, the present invention is not limited to this. For example, as shown in FIG. In addition, the lever member 86 is formed with a notch (or hole) 87 in which the engagement protrusion 84 can be disposed. And it is good also as a structure which sets the clearance gap X of the axial direction between each axial direction end surface 84a, 84b of the engaging protrusion 84, and the side end surfaces 87a, 87b of the notch 87. FIG.

  That is, when the slider 83 moves in the first direction (the direction from the left side to the right side in the figure), the axial end surface 84a of the engagement protrusion 84 as the first engagement portion and the engagement portion as the engagement portion. By engaging with the side end surface 87a of the notch 87, the first transmission state in which the detent plate 3 can be rotated in the normal direction is obtained. Further, when the slider 83 moves in the second direction (the direction from the right side to the left side in the drawing), the axial end surface 84a of the engaging protrusion 84 serving as the second engaging portion and the engaged portion serving as the engaged portion. By engaging with the side end face 87b of the notch 87, the second transmission state in which the detent plate 3 can be rotated in the reverse direction is obtained. Further, the lever member 36 can freely rotate within a range in which the side end faces 87 a and 87 b of the notch 87 do not engage with the axial end faces 84 a and 84 b of the engaging protrusion 84. As a result, with a simple configuration, the motor does not rotate between the first rotation position C1 corresponding to the boundary of the first transmission state and the second rotation position C2 corresponding to the boundary of the second transmission state. A buffer means that allows the detent plate 3 to freely rotate can be formed (see FIG. 7).

  In the second embodiment, the engagement surfaces 53 of the engagement protrusions 48a and 48b of the transmission member 45 constituting the engaged portion are formed in a substantially spherical shape. And about the axial direction end surfaces 46 and 47 used as the engaging surface by the side of the mobile body 43, it was set as the concave curved surface 54 corresponding to the hemispherical shape of each corresponding engaging protrusion 48a, 48b, respectively. However, the present invention is not limited to this, and even when the transmission member 45 is tilted, suitable engagement between the engagement protrusions 48a and 48b of the transmission member 45 and the axial end surfaces 46 and 47 on the movable body 43 side is preferable. A hemispherical shape is not necessarily required as long as the curved shape can ensure the state. Moreover, it is good also as a structure which curves and forms any one of the axial direction end surfaces 46 and 47 used as the engaging surface 53 of each engaging protrusion 48a, 48b of the transmission member 45, or the moving body 43 side. . And if an engagement state is securable, it is not necessary to curve both engagement surfaces.

  In the second embodiment, the shaft-shaped transmission member 45 is inserted into the cylinder of the movable body 43 formed in a cylinder. However, the shapes of the moving body and the transmission member are not necessarily limited to this, and a moving body having a cylindrical portion in a part thereof may be used. Moreover, the structure which uses the transmission member which has a shaft-shaped part in the part may be sufficient.

  In the second embodiment, the detent plate 3 is moved in the normal rotation direction by rotating the lever member 49 provided on the rotation shaft 11 of the detent plate 3 based on the axial movement of the transmission member 45. It was set as the structure which can be rotated in a reverse direction. However, the present invention is not limited to this. For example, a configuration in which the axial movement of the transmission member 45 is converted into the rotation of the detent plate 3 by other methods such as using a rack and pinion mechanism may be used.

  In the second and third embodiments, the worm gear 62 and the trapezoidal screw 75 as the screw-like members are spline-fitted to the rotary shafts 61 and 71, respectively. However, the present invention is not limited to this. For example, a so-called two-sided width or a polygonal shape (for example, a hexagon) can be used as long as the screw-like member can be fixed so that it cannot rotate relative to the rotation shaft and is axially movable. It may have a composite structure.

  In the second embodiment, the external gear 65 and the bearing 64 are the first restriction wall and the second restriction wall, and in the third embodiment, the bearings 63 and 64 are the first restriction wall and the second restriction wall. Two regulatory walls were used. However, the first restriction wall and the second restriction wall are not necessarily limited to this, and are provided separately in the axial direction, thereby restricting movement of the moving body in the first direction and the second direction, respectively. Anything is possible.

  DESCRIPTION OF SYMBOLS 1 ... Shift device, 3 ... Detent plate, 4 ... Detent spring, 5 ... Motor, 7 ... Transmission mechanism, 11 ... Turning shaft, 12 ... Circumferential surface, 13 ... Roller, 14 (14a, 14b) ... Fitting recessed part, DESCRIPTION OF SYMBOLS 20 ... Parking lock mechanism, 22 ... Parking gear, 23 ... Lock pole, 24 ... Park rod, 32 ... Trapezoid screw, 32a ... Screw part, 33 ... Slider, 33a ... Upper surface, 36 ... Lever member, 37 ... First engagement , 38 ... second engaging part, 39 ... engaged part, 40 ... transmission mechanism, 42 ... screw-like member, 42a ... screw part, 43 ... moving body, 43a ... screw part, 45 ... transmission member, 45c ... Insertion part, 46, 47 ... axial end face, 48a, 48b ... engagement protrusion, 49 ... lever member, 53 ... engagement surface, 54 ... curved surface, 60 ... transmission mechanism, 61 ... rotating shaft, 62 ... worm gear, 63, 64 ... bearings, 6 a, 64a ... side face, 65 ... external gear, 65a ... side face, 66 ... spline, 67 ... worm tooth, 68 ... gear tooth, 69 ... lever member, 70 ... transmission mechanism, 71 ... rotating shaft, 75 ... trapezoidal screw, 76 ... Slider, 76a ... Upper surface, 77a, 77b ... Engagement protrusion, 78 ... Screw part, 79 ... Screw part, 83 ... Slider, 84 ... Engagement protrusion, 84a, 84b ... Axial end face, 86 ... Lever member , 87, notches, 87 a, 87 b, side end faces, D 1, diameter, D 2, axial spacing, X, gap, S, sliding contact surface, P 0, apex, P 1, P 2, bottom, Px, Px ′, sliding contact. Position, C1... First rotation position, C2... Second rotation position, Y.

Claims (4)

A detent plate rotatably supported with a plurality of fitting recesses on the peripheral surface;
A transmission mechanism for transmitting motor rotation to the detent plate;
A detent spring that holds the detent plate in a rotational position corresponding to the fitting recess by slidingly contacting the peripheral surface of the detent plate in an elastic state and fitting with any of the fitting recesses. A shift device,
The transmission mechanism is
A screw-like member that rotates based on the motor rotation and has a screw part on the inner periphery;
A first engaging portion and a second engaging portion that have a screw portion on the outer periphery and reciprocate according to the direction of the motor rotation by being screwed to the screw-like member and are spaced apart in the axial direction. A moving body having a cylindrical portion with a joint portion ;
A shaft-shaped portion that is inserted into the cylindrical portion of the movable body and has an engaged portion that engages with the first engaging portion and the second engaging portion by moving the movable body. A transmission member capable of rotating the detent plate by axially moving integrally with the moving body based on the engagement of the engaged portion ,
A first transmission state in which the detent plate can be rotated in the normal direction while the movable body moves in the first direction and the first engaging portion and the engaged portion engage with each other;
A second transmission state in which the detent plate can be rotated in the reverse direction by moving the movable body in the second direction and engaging the second engaging portion and the engaged portion ; Yes, and
Buffering means for allowing free rotation of the detent plate between a first rotation position corresponding to the boundary of the first transmission state and a second rotation position corresponding to the boundary of the second transmission state. A shift device characterized in that a gap in the axial direction is set between the first engaging portion, the second engaging portion, and the engaged portion . The shift device according to claim 1 , wherein
At least one of the engagement surface on the first engagement portion and the second engagement portion side and the engagement surface on the engaged portion side is formed to be curved. The shift device according to claim 2 ,
The engaged portion includes a spherical engaging surface and includes a first engaging protrusion and a second engaging protrusion that are formed at two axial positions sandwiching the moving body. ,
A shift device characterized in that curved end surfaces constituting the first engaging portion and the second engaging portion are formed on both axial end surfaces of the moving body. In the shift device according to any one of claims 1 to 3,
The transmission member is connected to a lever member provided on a rotation shaft of the detent plate,
A radial gap that allows tilting of the shaft-shaped portion is set between the tubular portion of the moving body and the shaft-shaped portion of the transmission member inserted into the tubular portion. Shift device characterized.