JP2014105748A - Shift device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shift device in which arrangement of a biasing member assists a movement toward a releasing direction when a parking lock is released and simultaneously a detent plate is restricted to turn only with a biasing force of the biasing member.SOLUTION: A shift device 1 is constituted such that a transmitting mechanism 7 comprises a slider 33 reciprocated in response to a rotating direction of a trapezoid screw 32 for use in transmitting a motor rotation, it has a first transmitting state in which a detent plate 3 can be normally rotated through movement of the slider 33 in a first direction and a second transmitting state in which a movement of the slider 33 in a second direction enables the detent plate 3 to be oppositely rotated. There is provided buffering means for allowing a free rotation of the detent plate 3 between the first rotating position corresponding to the first transmitting state and a second rotating position corresponding to the second transmitting state. There is provided a spring 8 for assisting a movement of the slider 33 toward the second direction.

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, in the conventional shift device, for example, the parking lock is released from the parking lock state (the state where the vehicle enters the “P” range) in which the vehicle is tilted at the time of parking and the engaging claw 24 and the lock teeth 21a are in surface contact. In the “NP” range), there is a problem that a weight several times that when the parking lock is released to the parking state is generated. Furthermore, if a biasing member (assist spring) that applies a biasing force in the release direction when the parking lock is released in the conventional configuration is used, it is necessary to consider parking lock release due to the biasing force of the biasing member.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an urging member to assist movement in the release direction when the parking lock is released, and at the same time to apply the urging member. An object of the present invention is to provide a shift device that suppresses rotation of a detent plate only by power.

  The present invention includes a detent plate that has a plurality of fitting recesses on a peripheral surface and is rotatably supported, a transmission mechanism that transmits rotation of the motor to the detent plate, and a pressure state on the peripheral surface of the detent plate. A detent spring that holds the detent plate in a rotational position corresponding to the fitting recess by slidingly contacting with any of the fitting recesses, and the transmission mechanism includes: A moving body that reciprocates according to the direction of rotation of the trapezoidal screw that transmits the motor rotation, and the detent plate can be rotated in the forward direction by moving the moving body in the first direction. A transmission state and a second transmission state in which the detent plate can be rotated in the reverse direction by moving the moving body in the second direction. Buffer means for allowing free rotation of the detent plate between a first rotation position corresponding to the first transmission state and a second rotation position corresponding to the second transmission state, and It is a structure provided with the biasing member which assists the movement to either one of a 1st direction or the said 2nd direction.

  According to this configuration, by providing the urging member, the motor can be reduced in size and power can be saved by assisting the movement in the direction in which the load has been large, and the trapezoidal screw having high self-locking property can be obtained. By using, it can suppress that a moving body moves only by the urging | biasing force of an urging | biasing member, and rotates a detent plate.

  In the present invention, the moving body includes a first engaging portion and a second engaging portion that are provided apart from each other in the axial direction, and the transmission mechanism is screwed with the moving body to rotate the motor. A screw-like member that rotates based on the first engagement portion when the movable body moves in the first direction, and the second engagement when the movable body moves in the second direction. And a transmission that operates to rotate the detent plate in the forward rotation or the reverse rotation according to the moving direction of the moving body based on the engagement of the engaged portion. And a gap in the axial direction is set between the first engaging portion, the second engaging portion, and the engaged portion.

  According to this configuration, the transmission member can be freely moved within a range in which the transmission member is not engaged based on the axial gap set between the engaged portion and the first engagement portion and the second engagement portion. Can be moved to. Therefore, according to the above configuration, the detent that does not involve motor rotation between the first rotation position corresponding to the first transmission state and the second rotation position corresponding to the second transmission state with a simple configuration. A buffer means for allowing free rotation of the plate can be formed.

  The present invention includes a motor having a mover and a stator that generate the motor rotation, and the moving body is screwed with the rotating mover so that the moving body does not rotate in the direction of the motor rotation. And a slider that reciprocally moves in the axial direction, and a slider that has a first engagement portion and a second engagement portion that are spaced apart in the axial direction, and that reciprocates in the axial direction integrally with the screw member. The transmission mechanism engages with the first engaging portion of the slider by moving the moving body in the first direction and moves the moving body in the second direction. An engaged portion that engages with the second engaging portion of the slider, and the detent plate rotates forward or reversely according to the moving direction of the movable body based on the engagement of the engaged portion. Including a transmission member that operates to move Wherein between the first engagement portion and the second engaging portion and the engaged portion is configured such that a gap of the shaft direction is set.

  According to this configuration, when the mover rotates based on the rotation of the motor, the movable body (the screw-like member and the slider) moves in the axial direction based on the screwed relationship (screw pair) with the screw-like member. Therefore, according to the above configuration, the detent that does not involve motor rotation between the first rotation position corresponding to the first transmission state and the second rotation position corresponding to the second transmission state with a simple configuration. A buffer means for allowing free rotation of the plate can be formed.

  In the present invention, the transmission member includes a lever member that has the engaged portion and is fixed to a rotation shaft of the detent plate so as to rotate according to a moving direction of the moving body. .

  According to this configuration, the lever member can be freely moved within a range in which the lever member is not engaged based on the gap in the axial direction set between the engaged portion and the first engaging portion and the second engaging portion. Can be rotated. Thus, with a simple configuration, the detent plate can rotate freely between the first rotation position corresponding to the first transmission state and the second rotation position corresponding to the second transmission state without motor rotation. A buffer means for allowing movement can be formed.

  According to the present invention, the transmission mechanism is configured to rotate with respect to the rotation shaft, the first restriction wall and the second restriction wall that are spaced apart in the axial direction of the rotation shaft, and the rotation shaft. A screw-like member provided so as not to be relatively rotatable and axially movable between the first restriction wall and the second restriction wall, and a screw engaging portion with respect to the screw part of the screw-like member; Conversion means capable of converting rotation into rotation of the detent plate, and an axial gap is set between the first restriction wall, the second restriction wall, and the screw-like member. It is a configuration.

  According to this configuration, when the motor rotation is stopped, the screw-like member as the moving body is set between the first restriction wall and the second restriction wall by rotating the detent plate. Based on the gap in the axial direction, the rotational axis is moved in the axial direction without rotation of the rotational axis. Specifically, if the screw-shaped member is in the first transmission state when the rotation of the motor is stopped, the detent plate further rotates in the forward direction so that the rotation stops on the rotation axis in the second direction. Move to. Further, if the screw-shaped member is in the second transmission state when the motor rotation is stopped, the detent plate further rotates in the reverse direction to move on the rotating shaft where the rotation has stopped in the first direction. To do. Thus, the buffer that allows the detent plate to freely rotate without motor rotation between the first rotation position corresponding to the first transmission state and the second rotation position corresponding to the second transmission state. Means can be formed.

  According to the present invention, the conversion means is fixed to a second screw member having a screw portion serving as the screw engaging portion and screwed to the screw member, and a rotating shaft of the detent plate. And a lever member rotatably connected to the second screw member.

  According to this configuration, the second screw member moves in the axial direction on the screw member based on the rotation of the screw member. Then, the axial movement of the second screw member can be converted into rotation of the detent plate by the lever member.

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 perspective view which shows schematic structure of the shift apparatus 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 partial top view of the transmission mechanism in 5th Embodiment.

[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 in a relatively non-relative manner in such a manner as to penetrate 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, as the detent plate 3 rotates, the roller 13 slides on the peripheral surface 12 while rotating. 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 23d) 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 in 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 with its both ends being pivotally supported by bearings 34 and 35 so that axial movement is restricted. 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. Further, between the slider 33 and the bearing 35, the movement of the slider 33 in the second direction (see FIG. 5, the direction from the bearing 35 toward the bearing 34) is assisted, and the slider 33 is moved in the first direction (see FIG. 5). And a spring 8 (biasing member) that suppresses movement in the direction from the bearing 34 toward the bearing 35).

  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, the engaged portion 39 of the lever member 36 is engaged with the first engaging portion 37 by the slider 33 moving in the first direction based on the motor rotation. 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.

  As shown in FIG. 6, the engaged portion 39 of the lever member 36 is engaged with the second engaging portion 38 by the slider 33 moving in the second direction based on the motor rotation. 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 the present embodiment, the detent plate 3 is free from rotation between the first rotation position corresponding to the first transmission state and the second rotation position corresponding to the second transmission state. A buffer means for allowing rotation 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 slider 33 moves in the first direction against the biasing force of the spring 8 based on the rotation of the motor until the roller 13 moves to the sliding contact position Px. 7 is a state in which the first engaging portion 37 of the slider 33 and the engaged portion 39 of the lever member 36 are engaged. 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 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 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 has 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.

  When the parking lock mechanism 20 is switched to the non-parking state, the detent plate 3 is rotated in the reverse rotation direction (see FIG. 3, counterclockwise direction), and the urging force of the spring 8 is applied to the slider 33. Except for assisting movement in two directions, the same operation as that when switching to the parking state 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) By providing the spring 8, the motor 5 can be reduced in size and power can be saved by assisting the movement of the slider 33 in the second direction (the reverse direction of the detent plate 3), which has been a heavy load. Further, by using the trapezoidal screw 32 having a higher self-locking property, it is possible to suppress the slider 33 from moving only by the urging force of the spring 8 and rotating the detent plate 3.

(2) 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 according to the direction of motor rotation, and a first transmission state in which the detent plate 3 can be rotated in the normal direction by moving the slider 33 in the first direction; The slider 33 has a second transmission state in which the detent plate 3 can be rotated in the reverse direction by moving in the second direction. The transmission mechanism 7 is a buffer unit that allows the detent plate 3 to freely rotate between the first rotation position C1 corresponding to the first transmission state and the second rotation position C2 corresponding to the second transmission state. Is provided.

  According to the above configuration, when the roller 13 of the detent spring 4 is fitted to 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.

(3) 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, the motor is rotated between the first rotation position C1 corresponding to the first transmission state and the second rotation position C2 corresponding to the second transmission state with a simple configuration. It is possible to form a buffer means that allows free rotation of the detent plate 3.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. The present embodiment is different from the first embodiment only in the configuration of the motor and 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 this embodiment, the motor 5 includes a housing 51 that covers the outer peripheral surface, a mover 52 that generates motor rotation included in the housing 51, and a stator 53. Note that the trapezoidal screw 32 is integrally formed with the slider 33 and a fixing nut 41 which is a rotation stopper, so that the trapezoidal screw 32, the slider 33 and the fixing nut 41 integrally form the moving body 40. doing. In addition, a spring 8 is provided between the housing 51 and the fixing nut 41 to be wound around the trapezoidal screw 32 and urged in the second direction (from the motor 5 toward the slider 33). The trapezoidal screw 32 is screwed with the movable element 52 that rotates as the motor rotates, so that the movable body 40 in which the trapezoidal screw 32, the slider 33, and the fixed nut 41 are integrated does not rotate and the motor rotates. Reciprocates in the axial direction according to the direction.

  As described above, according to the present embodiment, it is possible to obtain the same effects as those of the first embodiment. Further, since it is not necessary to provide a bearing or the like on the second direction side of the slider 33, the shift device 1 can be made compact and the number of parts can be reduced.

[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 second embodiment only in the configuration of the motor 5 and the moving body. Therefore, the same components as those of the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 9, in this embodiment, the spring 8 is provided between the trapezoidal screw 32 and the housing 51.

  As described above, according to the present embodiment, the same effects as those of the above embodiments can be obtained. Further, since the spring 8 is included in the housing 51, it is possible to reduce the attachment of the spring 8 to shorten the life of the spring 8.

[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. 10 to 12, the transmission mechanism 70 of the present embodiment is similar to the transmission mechanism 7 of the first embodiment in that the axial ends of the transmission mechanism 70 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.

  A spline 66 is formed on the outer periphery of the rotating shaft 71, and the trapezoidal screw 75 is spline-fitted to the rotating shaft 71. 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 rotating 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. Further, between the slider 76 and the bearing 64, the movement of the slider 76 in the first direction (see FIG. 11, the direction from the bearing 64 toward the bearing 63) is assisted, and the slider 76 is moved in the second direction (see FIG. 11). And a spring 8 (biasing member) that suppresses movement in the direction from the bearing 63 toward the bearing 64).

  The transmission mechanism 70 is fixed to be non-rotatable relative to the slider 76 screwed to the trapezoidal screw 75 and the rotation shaft 11 of the detent plate 3, and the tip end portion 36 b is connected to the slider 76 to be rotatable. Lever member 36 is provided.

  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 transmission mechanism 70 of the present embodiment, the slider 76 transmits the motor torque in the first rotational direction (see FIG. 11) via the trapezoidal screw 75, thereby resisting the urging force of the slider 76 in the second direction. When the motor torque is transmitted in the second rotation direction (see FIG. 11), the motor torque is moved 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 screwed 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. 13, the trapezoidal screw 75 moves in the first 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.

  As shown in FIG. 14, 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. 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 the rotation of the rotary shaft 71.

  Specifically, as shown in FIG. 13, when the motor rotation is stopped and the first transmission state is established, the trapezoidal screw 75 and the slider 76 are rotated by the forward rotation of the detent plate 3. Moves in the second direction on the rotating shaft 71 stopped. Further, as shown in FIG. 14, 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 reverse rotation of the detent plate 3. It moves on the rotating shaft 71 in the first direction. In the present embodiment, the detent plate 3 does not involve motor rotation between the first rotation position C1 corresponding to the first transmission state and the second rotation position C2 corresponding to the second transmission state. A buffer means for allowing free rotation 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. Further, the slider 76 can be reduced in size.

[Fifth Embodiment]
Hereinafter, a fifth 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 FIG. 15, the engagement projection 84 is provided on the slider 83. 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 an 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 described above, according to the present embodiment, the freedom of the detent plate 3 without motor rotation between the first rotation position C1 corresponding to the first transmission state and the second rotation position C2 corresponding to the second transmission state. By forming the buffer means that allows the rotation, 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 each of the above embodiments, a spring is used, but an elastic member such as rubber may be used.

In the first embodiment, between the slider 33 and the bearing 35, the spring 8 that assists the movement of the slider 33 in the second direction and suppresses the movement of the slider 33 in the first direction (biasing) A spring (biasing member) that assists the movement of the slider 33 in the second direction and suppresses the movement of the slider 33 in the first direction. good.

In the first to third embodiments, the upper surface 33a of the slider 33 is provided with the projecting first engagement portion 37 and the second engagement portion 38 that are spaced apart in the axial direction, and 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.

In the fourth embodiment, the movement of the slider 76 in the first direction (direction from the bearing 64 toward the bearing 63) is assisted between the slider 76 and the bearing 64, and the slider 76 is moved in the second direction ( A spring 8 (a biasing member) that suppresses movement in the direction from the bearing 63 to the bearing 64 is provided. However, the slider 76 assists the movement in the first direction between the slider 76 and the bearing 63, and the slider 76. A spring (biasing member) that suppresses movement in the second direction may be provided.

DESCRIPTION OF SYMBOLS 1 ... Shift device 3 ... Detent plate 4 ... Detent spring 5 ... Motor 7 ... Transmission mechanism 8 ... Spring 11 ... Rotating shaft 32 ... Trapezoid screw 33 ... Slider (moving body)

Claims (6)

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 includes a moving body that reciprocates according to the direction of rotation of the trapezoidal screw that transmits the motor rotation,
A first transmission state in which the detent plate can be rotated in a normal direction by moving the moving body in a first direction;
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
Buffer means for allowing free rotation of the detent plate between a first rotation position corresponding to the first transmission state and a second rotation position corresponding to the second transmission state;
A shift device comprising an urging member for assisting movement of the movable body in either the first direction or the second direction. The moving body includes a first engagement portion and a second engagement portion that are provided apart in the axial direction,
The transmission mechanism is a screw-like member that is screwed with the moving body and rotates based on the motor rotation;
The engaged body engages with the first engaging portion by moving the moving body in the first direction and engages with the second engaging portion by moving the moving body in the second direction. And a transmission member that operates to rotate the detent plate according to the moving direction of the moving body based on the engagement of the engaged portion, and to rotate the forward rotation or reverse rotation of the detent plate.
The shift device according to claim 1, wherein a gap in the axial direction is set between the first engaging portion, the second engaging portion, and the engaged portion. A motor having a mover and a stator for generating the motor rotation;
A screw-like member that reciprocates in the axial direction according to the direction of the motor rotation without rotating itself by being screwed to the moving mover.
A slider having a first engagement portion and a second engagement portion provided apart in the axial direction and reciprocating in the axial direction integrally with the screw-like member;
The transmission mechanism is
When the movable body moves in the first direction, the movable body engages with the first engaging portion of the slider, and when the movable body moves in the second direction, the movable body moves to the second engaging portion of the slider. A transmission member having an engaged portion to be engaged, and operating to rotate the detent plate in the forward rotation or the reverse rotation according to the moving direction of the movable body based on the engagement of the engaged portion; With
The shift device according to claim 1, wherein a gap in the axial direction is set between the first engaging portion, the second engaging portion, and the engaged portion.   The said transmission member is a lever member which rotates according to the moving direction of the said mobile body by having the said to-be-engaged part and being fixed to the rotating shaft of the said detent plate. Shift device. The transmission mechanism is
A rotating shaft that rotates based on the motor rotation;
A first restricting wall and a second restricting wall that are spaced apart in the axial direction of the rotating shaft;
A screw-like member provided so as not to rotate relative to the rotation shaft and to be movable in the axial direction between the first and second regulating walls;
Conversion means having a screw engaging portion with respect to the screw portion of the screw-like member and capable of converting the rotation of the screw-like member into the rotation of the detent plate;
The shift device according to claim 1, wherein an axial gap is set between the first and second regulating walls and the screw-like member. The converting means includes
A second screw-like member screwed into the screw-like member having a screw portion serving as the screw engaging portion;
A lever member fixed to the rotation shaft of the detent plate and rotatably connected to the second screw-shaped member;
A shift device according to claim 5.

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