JP4145264B2 - Parking lock device - Google Patents

Description

The present invention relates to a parking lock device such as an unmanned parking lot.

  An example of a conventional parking lock device is shown in FIG. FIG. 8 is a plan view in which a part of the parking lock device is cut away.

  As shown in FIG. 8, the parking lock device includes a shielding plate 101. The shielding plate 101 is supported by the horizontal shaft 105 with respect to the housing 103. Accordingly, when the horizontal shaft 105 is rotationally driven, the shielding plate 101 is rotated from the lower storage position to the upper lock position.

  The lock plate 101 is driven by a hydraulic cylinder 107. An arm 111 is interlocked to the piston 109 of the hydraulic cylinder 107. The arm 111 is attached to the display tube 113. A stopper 115 is provided on the arm 111 side.

  The horizontal shaft 105 passes through the display tube 113, and an arm 117 is provided at the end of the horizontal shaft 105. A buffer spring 119 is fitted and supported on the horizontal shaft 105, one arm of the buffer spring 119 is engaged with the arm 117, and the other arm is engaged with the stopper 115.

  Therefore, when the piston 109 is extended by driving the hydraulic cylinder 107, the arm 111 and the display cylinder 113 are rotated. The rotation of the arm 111 causes the horizontal shaft 105 to rotate via the stopper 115, the buffer spring 119, and the arm 117, and the shielding plate 101 rises to lock the vehicle from exiting.

  When the vehicle forcibly leaves with the shielding plate 101 upright, the shielding plate 101 receives an excessive force from the vehicle, and the horizontal shaft 105 is forcibly driven and rotated in the reverse direction (downward direction). At this time, the buffer spring 119 is bent between the arm 117 and the stopper 115 so that an excessive force is not directly applied to the hydraulic cylinder 107 side.

  However, in the above structure, since the buffer spring 119 is interposed in the drive system between the hydraulic cylinder 107 and the shielding plate 101, there is a risk that the reliability of driving the shielding plate 101 by the hydraulic cylinder 107 may be impaired. is there.

JP 2002-387553 A

  The problem to be solved is that the certainty of driving of the driven member is impaired when a structure for buffering the force from the driven member side is used.

In the present invention, when an automobile gets on the vehicle by improper departure, the locking plate can be securely locked by the locking plate while the force from the locking plate side can be buffered. When the automobile rotates on the lock plate by improper departure, the operation shaft can be rotated and interlocked by the rotational force received by the lock plate, the worm wheel provided coaxially on the operation shaft side, A parking lock device comprising: a drive shaft provided with a worm arranged orthogonally to an operation shaft and meshing with the worm wheel; and an actuator for rotationally driving the drive shaft, wherein the drive shaft is rotated relative to the actuator. rotation of the worm wheel the locking plate when the actuator is stopped from the upper locked position to allow the lowering operation while engaged Wherein the along the rotation axis direction as it is moved configured to be capable of moving in the direction along the rotation axis of the drive shaft without worm is rotated, the rotational axis of the drive shaft in meshing night An urging means for urging toward the original position in a direction along the direction is provided, and after the urging means has bottomed between the operating shaft and the worm wheel, relative rotation is performed with a predetermined relative rotational force between the two. A friction engagement portion is provided, and detection means is provided for detecting movement of a predetermined range in a direction along the rotation axis of the drive shaft when the actuator is driven, and the actuator is driven by detection of the detection means. The main feature is that a drive control means for stopping is provided .

The parking lock device of the present invention can be rotated and interlocked by the rotational force received by the lock plate when the vehicle rides on the lock plate by improper exit when the lock plate rotates between the lowered position and the upper locked position. An operation shaft, a worm wheel provided coaxially on the operation shaft side, a drive shaft including a worm that is arranged orthogonal to the operation shaft and meshes with the worm wheel, and an actuator that rotationally drives the drive shaft A parking lock device, wherein the drive shaft is rotationally engaged with the actuator, and the lock plate can be lowered from the upper lock position when the actuator is stopped, by rotating the worm wheel. meshing with the worm is directly moved in the direction along the rotational axis without rotating along the rotational axis of the drive shaft And configured to be capable of moving in the direction, a biasing means for biasing the drive shaft to the original position side of the direction along the rotational axis is provided, between the operating shaft and the worm wheel, with the A frictional engagement portion that allows relative rotation with a predetermined relative rotational force between the two after the biasing means is provided is provided, and the drive shaft moves in a predetermined range in the direction along the rotation axis when the actuator is driven. Detection means is provided, and drive control means for stopping the drive by the actuator by detection of the detection means is provided. Therefore, when the drive shaft is driven to rotate by the actuator, it is rotated to the operation shaft side via the worm and the worm wheel. The force is transmitted, and the lock plate can be reliably driven. The worm rotates by meshing with the rotation of the worm wheel when the vehicle rides on the lock plate by improper departure while the actuator is stopped and the lock plate receives an excessive force and moves from the upper lock position to the lower position. Without moving the drive shaft in the direction along the rotation axis without causing the drive shaft to move in the direction along the rotation axis, the biasing force of the biasing means is applied. Relative rotation at the friction engagement portion can be allowed.

Therefore, the lock plate can be protected even when the lock plate receives an unreasonable force due to the vehicle getting on the lock plate due to unauthorized departure. Further, no force is applied to the actuator, and the actuator can be protected.

When a detection means for detecting a predetermined range of movement in a direction along the rotation axis of the drive shaft is provided, and a drive control means for stopping the drive by the actuator by the detection of the detection means, the actuator is locked by the actuator. when operating the plate, after the operation of the lock plate side is determined positions completed, the drive shaft rotation of the drive shaft by the driving of the actuator is continued is along the rotation axis by a worm meshing rotation with respect to the worm wheel to a stationary The movement is detected by the detection means, and the drive control means can stop the drive of the actuator.

Therefore, even if the actuator is operated due to inertia, the lock plate can be reliably operated without excessive reaction force. Moreover, since the detecting means from the lock plate are determined position to detect the movement of the predetermined range in the direction along the rotation axis of the drive shaft, can drive the lock plate to the desired position reliably stopped.

  A buffer material is provided on the drive shaft or a fixed side that supports the drive shaft, and when the detection is performed by the buffer material coming into contact with the detection means, the reaction force to the drive shaft is buffered by the buffer material. And the actuator can be more reliably protected.

When a friction engagement portion that allows relative rotation with a predetermined relative rotational force between the operation shaft and the worm wheel is provided, the drive shaft moves in a direction along the rotation axis, When the biasing means is at the bottom, the drive shaft receives further moving force in the bottoming direction of the biasing means due to unintentional unreasonable force from the lock plate side due to the vehicle getting on improperly even if it is possible to relatively rotate between the operating shaft and the worm wheel by frictional engagement portion, to suppress excessive force to work more than constant lock plate side, it is possible to protect the locking plate .

Drive shaft by an actuator, the worm and the worm wheel, reliably drive the locking plate via the operation shaft, the purpose of buffering the said force when receiving the force from the lock plate in the riding by unauthorized Desha automobile, easy Realized with a simple structure.

  1 and 2 relate to a first embodiment of the present invention, FIG. 1 is a plan view of a principal part of a part of a parking lock device to which the embodiment of the present invention is applied, and FIG. 2 is a sectional view of the same part. It is a principal part side view.

  As shown in FIG. 1, the parking lock device 1 is configured to operate a lock plate 5 that is a driven member by a drive device 3. The drive device 3 includes an operation shaft 7, a worm wheel 9, a drive shaft 13 having a worm 11, and an electric motor 15 as an actuator.

  The operating shaft 7 is rotatably supported by the base frame 17 of the parking lock device 1. The lock plate 5 is attached to the operation shaft 7, and the rotation of the operation shaft 7 causes the lock plate 5 to rotate between a lower storage position and an upper lock position. A joint member 19 is attached to the end of the operating shaft 7.

  A drive shaft support frame portion 21 is integrally provided at an end portion of the base frame 17. The drive shaft support frame portion 21 has opposing wall portions 25 and 27 on a bottom wall portion 23 that is integrally extended from the base frame 17. Opposing support wall portions 29 and 31 are provided between the facing wall portions 25 and 27.

  A relay shaft 33 is rotatably supported through the opposing wall portions 25 and 27. The relay shaft 33 is provided with a tapered portion 35 at an intermediate portion. A joint member 37 is attached to one end of the relay shaft 33. The joint member 37 is fitted to the joint member 19 of the operating shaft 7 from the direction along the rotation axis and is rotationally coupled. A male screw portion 39 is provided on the other end side of the relay shaft 33. The worm wheel 9 is supported on the relay shaft 33. The support structure of the worm wheel 9 will be described with reference to the sectional view of FIG.

  The worm wheel 9 is provided with a tapered hole portion 41 and is fitted to the tapered shaft portion 35 of the relay shaft 33. That is, the worm wheel 9 is configured to be coaxial with the operation shaft 7. A long nut 43 is screwed into the male screw portion 39. The long nut 43 is prevented from loosening by a lock nut 45. A disc spring 47 is interposed between the tip of the long nut 43 and the worm wheel 9. The disc spring 47 presses the tapered hole portion 41 of the worm wheel 9 against the tapered shaft portion 35 of the relay shaft 33.

  Therefore, the worm wheel 9 and the relay shaft 33 rotate integrally up to a predetermined relative rotational force that is set, and when the relative rotational force exceeds a predetermined value, the worm wheel 9 and the relay shaft 33 are located between the tapered shaft portion 35 and the tapered hole portion 41. Relative rotation is allowed. That is, the taper shaft portion 35 and the taper hole portion 41 constitute a friction engagement portion in the present embodiment. The relay shaft 33 is fitted with a collar 49 to restrict the movement of the relay shaft 33 in the direction along the rotation axis.

  The worm 11 meshes with the worm wheel 9 and is provided integrally with the drive shaft 13. The drive shaft 13 is supported through the support holes 51 and 53 provided in the support wall portions 29 and 31. Therefore, the drive shaft 13 is movable in a direction along the rotation axis.

  Coil springs 55 and 57 are interposed as urging means between the worm 11 and the support wall portions 29 and 31, respectively. The coil springs 55 and 57 urge the drive shaft 13 toward the original position in the direction along the rotation axis.

  Bump rubbers 59 and 61 are attached to both ends of the drive shaft 13 as cushioning materials. The bump rubbers 59 and 61 are integrally fixed to the flange members 63 and 65 and are fitted and supported on the drive shaft 13. The flange members 63 and 65 are fastened and fixed to the end portion of the drive shaft 13 by nuts 67 and 69.

  For example, limit switches 71 and 73 are attached to the support walls 29 and 31 as detection means on the sides facing the bump rubbers 59 and 61, respectively. The limit switches 71 and 73 detect the movement of a predetermined range in the direction along the rotational axis of the drive shaft 13 when the bump rubbers 59 and 61 come into contact with each other. The detection signals of the limit switches 71 and 73 are input to a controller 87 as drive control means. The controller 87 is configured to stop driving by the electric motor 15 by detection of the limit switches 71 and 73.

  The electric motor 15 is attached to the drive shaft support frame portion 21 by a mounting bracket 75. A coupling shaft 79 is attached to the output shaft 77 of the electric motor 15. The coupling shaft 79 is provided with a slit portion 81. The coupling shaft 79 is fitted in the shaft hole 83 of the drive shaft 13. A screw 85 is screwed into the drive shaft 13 adjacent to the nut 67, and a shaft portion of the screw 85 is fitted into the slit portion 81.

  Therefore, the coupling shaft 79 and the shaft hole 83 of the drive shaft 13 can be moved relative to each other in the direction along the rotation axis, and the shaft portion of the screw 85 is engaged with the slit portion 81 and is rotationally coupled. .

  When the electric motor 15 is driven under the control of the controller 87, the rotational force is transmitted to the drive shaft 13 through the output shaft 77 and the coupling shaft 79. The rotational force of the drive shaft 13 is transmitted to the relay shaft 33 via the worm 11 and the worm wheel 9. From the relay shaft 33, it is transmitted to the operation shaft 7 through joint members 37 and 19. The operating shaft 7 is rotated by this rotational force transmission, and the lock plate 5 is rotated up to the upper lock position or rotated down to the lower storage position.

  When the lock plate 5 is positioned by contact with the lower surface of the floor panel of the automobile by the upward rotation of the lock plate 5, the rotation of the operation shaft 7 stops. When the rotation of the operation shaft 7 is stopped, the rotation of the relay shaft 33 is also stopped via the joint members 19 and 37, and the rotation of the worm wheel 9 is stopped. If the rotation of the electric motor 15 is continued at this time, the drive shaft 13 continues to rotate and the worm 11 continues to engage with the stopped worm wheel 9.

  By the meshing operation, the worm 11 moves while rotating in the direction along the rotation axis of the drive shaft 13. As the worm 11 moves, the drive shaft 13 also moves in the same direction. In this case, for example, in FIG. 1, it is assumed that the drive shaft 13 moves to the right. As a result of this movement, the bump rubber 59 of the drive shaft 13 is also moved together and brought into contact with the limit switch 71 by movement within a predetermined range. Due to this contact, the movement of the drive shaft 13 within a predetermined range is detected, a detection signal is input from the limit switch 71 to the controller 87, and the controller 87 stops driving the electric motor 15.

  Therefore, the lock plate 5 stops at an arbitrary position in contact with the floor panel of the automobile.

  The electric motor 15 has an inertial force at the time of rotational driving, and the inertial force increases according to the magnitude of increase / decrease in angular acceleration. In other words, if the rotational speed of the electric motor 15 is increased for quick operation and is stopped suddenly, the inertial force increases accordingly. In this embodiment, even if there is this inertial force, it is possible to regulate and protect the impact input to the electric motor 15 and the like.

  When there is stop control from the controller 87 and the electric motor 15 is controlled to stop, the electric motor 15 rotates inertially from when the stop control is started until the electric motor 15 is completely stopped. The force due to the inertial rotation is bent and buffered by the bump rubber 59 coming into contact with the support wall 29, and an excessive reaction force does not act on the electric motor 15. Therefore, it is possible to protect the electric motor 15 while performing a quick operation, and to improve durability.

  When the drive shaft 13 moves in the direction along the rotation axis, the coupling shaft 79 and the drive shaft 13 are rotationally coupled by the engagement of the slot 81 and the screw 85, and the coupling shaft 79 and the drive shaft 13 are coupled. Is relatively moved by the shaft hole 83. Accordingly, the movement of the drive shaft 13 in the direction along the rotation axis of the drive shaft 13 can be performed without difficulty while transmitting the rotational force from the electric motor 15 to the drive shaft 13.

  When the lock plate 5 is lowered and the lock plate 5 is positioned and stopped at the lowered position, the drive shaft 13 is moved in the direction along the rotation axis in the left direction of FIG. Contacts the limit switch 73, and the limit switch 73 inputs the detection signal to the controller 87.

  Accordingly, similarly, the electric motor 15 is automatically controlled to stop at the lowered position of the lock plate 5. Also in this case, the bump rubber 61 abuts against the support wall portion 31 and cushions, so that the electric motor 15 can be protected even if the electric motor 15 has inertial rotation.

  When the automobile tries to ride over the lock plate 5 at the lock position above the lock plate 5, the lock plate 5 receives an unreasonable force in the downward rotation direction. When the lock plate 5 receives an excessive force, the operating shaft 7 rotates in conjunction with the rotation, and this rotation is transmitted to the worm 11 via the relay shaft 33 and the worm wheel 9. At this time, the worm 11 does not rotate but translates as it is in the direction along the axis of rotation due to the meshing with the rotation of the worm wheel 9. By this movement, the drive shaft 13 also moves in the same direction. In this case, in this embodiment, for example, the drive shaft 13 moves to the left in FIG. By this movement, the coil spring 55 is bent between the worm 11 and the support wall portion 29, and the moving force due to an unreasonable force transmitted to the drive shaft 13 can be buffered. Further, the movement of the drive shaft 13 in the direction along the rotation axis is allowed by relative movement of the coupling shaft 79 and the shaft hole 83 of the drive shaft 13, and no excessive force is applied to the electric motor 15. .

  Therefore, forcible rotation of the lock plate 5 is allowed while being buffered by the coil spring 55, and damage to the lock plate 5 and the like can be suppressed. In addition, since an excessive force is not exerted on the electric motor 15, the electric motor 15 can be prevented from being damaged.

  When a force for forcibly rotating the lock plate 5 from the upper lock position is input, the operating shaft 7 rotates in the opposite direction. For this reason, the worm 11 moves in the opposite direction to the coil spring 57 and the force applied to the lock plate 5 can be buffered. Therefore, the movement of the lock plate 5 due to an excessive force can be allowed similarly, and the lock plate 5 and the electric motor 15 can be reliably protected.

  When the lock plate 5 is forced to move and the coil spring 57 is bottomed, and the lock plate 5 receives a further excessive force from the bottomed state, the taper shaft portion 35 and the taper hole portion 41 when the force exceeds a certain level. Relative rotation is allowed between them, and the rotation of the worm wheel 9 is stopped and held at that position.

  In this case, excessive force acting on the lock plate 5 is buffered by the frictional engagement force between the tapered shaft portion 35 and the tapered hole portion 41 by the setting of the disc spring 47, and similarly, the movement of the lock plate 5 is allowed. However, the lock plate 5 can be protected.

  When the drive shaft 15 moves in the direction along the axis of rotation due to an unreasonable force acting on the lock plate 5, the magnitude of the unreasonable force acting on the lock plate 5 is the reaction force adjustment of the coil springs 55 and 57. The limit switches 71 and 73 can be easily changed and adjusted depending on the size.

  4 and 5 relate to a second embodiment of the present invention. FIG. 4 corresponds to FIG. 1 and is a plan view of a principal part of a parking lock device partially cut in cross section. FIG. 5 corresponds to FIG. 2 is a side view of a part of the locking device 1 in cross section. FIG. Note that components corresponding to those in the first embodiment are described with the same reference numerals.

  In this embodiment, the coil spring 57 and the limit switch 73 in FIG. 1 are omitted.

  In the present embodiment, when the lock plate 5 is rotated upward and positioned by being in contact with the lower surface of the floor panel of the automobile and the bump rubber 59 is in contact with the limit switch 71 as the electric motor 15 continues to rotate, The motor 15 is stopped.

  The lowered position of the lock plate 5 is always a fixed position, unlike the raised position of the lock plate 5, so that the controller 87 can easily return to the original position by storing the upward drive rotation amount of the electric motor 15. it can.

  6 and 7 relate to the third embodiment of the present invention, FIG. 6 is an enlarged sectional view around the relay shaft corresponding to FIG. 3, and FIG. 4 is a front view of the spring receiver. Note that components corresponding to those in the first embodiment will be described with the same reference numerals or A added to the same reference numerals. The overall configuration is substantially the same as that of the first embodiment, and reference is made to FIGS.

  The worm wheel 9A of this embodiment is provided with a straight shaft hole 89 instead of the tapered hole 41, and is fitted to the straight support shaft 90 of the relay shaft 33A so as to be relatively rotatable. That is, the worm wheel 9A is configured to be coaxial with the operation shaft 7A.

  A collar 91 is supported on the support shaft portion 90 of the relay shaft 33 </ b> A so as to be relatively rotatable by fitting with a fitting hole 92. However, the collar 91 can be coupled to the end of the relay shaft 33A so as not to be relatively rotatable.

  The collar 91 is provided with a coupling hole 93. The coupling hole 93 is formed in a hexagonal cross section, for example, to prevent rotation. For example, a coupling end portion 94 having a hexagonal cross section is provided at the end of the operating shaft 7A, and is fitted into the coupling hole 93 of the collar 91. By this fitting, the collar 91 rotates with the operating shaft 7A.

  In this embodiment, a ring-shaped spring receiver 95 is provided between the long nut 43 and the disc spring 47. The spring receiver 95 has a pair of engaging pieces 97 protruding from the inner peripheral hole 96. The inner peripheral hole 96 is formed in a size that fits loosely on the outer periphery of the male screw portion 39 of the relay shaft 33A. The male screw portion 39 of the relay shaft 33 </ b> A is provided with a pair of engagement grooves 98 in a direction along the axis of the male screw portion 39. The engagement groove 98 is formed across the end of the relay shaft 33A. An engagement piece 97 of the spring receiver 95 is engaged with the engagement groove 98.

  The spring receiver 95 is attached from the end of the relay shaft 33A. The engaging piece 97 of the spring receiver 95 is opposed to the end of the engaging groove 98 at the end of the relay shaft 33A, and the spring receiver 95 is moved along the male screw portion 39 in the direction along the axis.

  After the worm wheel 9 </ b> A, the disc spring 47 and the spring receiver 95 are attached as shown in FIG. 6, the long nut 43 is screwed into the male screw portion 39 and locked by the lock nut 45.

  The disc spring 47 urges the worm wheel 9 </ b> A while being received by the spring receiver 95. By this urging, the side surface 99 of the worm wheel 9A is pressed against the side surface 100 of the collar 91, and exerts a frictional force between them. The worm wheel 9A and the collar 91 are frictionally engaged with each other by this frictional force, and a rotational force can be transmitted between them. That is, the side surfaces 99 and 100 constitute a friction engagement portion in this embodiment. Accordingly, the rotational force can be transmitted from the worm 11 to the operating shaft 7A via the worm wheel 9A and the collar 91, and the rotational force can be transmitted from the operating shaft 7A to the worm wheel 9A via the collar 91.

  Further, as in the above-described embodiment, when the coil spring 57 is bottomed by the excessive movement of the lock plate 5 and the lock plate 5 receives an excessive force from the bottomed state, The relative sliding rotation is allowed between 99 and 100, and the rotation of the worm wheel 9A is stopped and held at that position.

  In this case, excessive force acting on the lock plate 5 is buffered by the frictional engagement force between the side surfaces 99 and 100 set by the disc spring 47, and similarly, the lock plate 5 is allowed to move while the lock plate 5 is allowed to move. 5 can be protected.

  When the side surfaces 99 and 100 are slid relative to each other, the relay shaft 33A may also rotate with the collar 91 side. During this rotation, the spring receiver 95 tries to frictionally engage with the worm wheel 9 </ b> A that is stationary via the disc spring 47. However, the spring receiver 95 can rotate integrally with the relay shaft 33A side even if it receives frictional engagement force from the worm wheel 9A side by engaging the engagement piece 97 with the engagement groove 98. For this reason, the spring receiver 95 and the long nut 43 side can rotate integrally with respect to the relay shaft 33A, and the rotational force in the loosening direction with respect to the relay shaft 33A does not act on the long nut 43 side. The spring receiver 95 can be reliably supported by the lock nut 45.

  Therefore, this embodiment can achieve the same effects as those of the first embodiment. Further, in this embodiment, the loosening of the long nut 43 can be reliably suppressed.

  When the drive shaft 15 moves in the direction along the axis of rotation due to an unreasonable force acting on the lock plate 5, the magnitude of the unreasonable force acting on the lock plate 5 is the reaction force adjustment and limit of the coil spring 55. It can be easily changed and adjusted depending on the size of the switch 71.

  In the above embodiment, the bump rubbers 59 and 61 are attached to the drive shaft 13 side. However, the bump rubbers 59 and 61 can be attached to the support wall portions 29 and 31 side.

  Although the said drive device 3 was used for the parking lock apparatus 1, it can also be used as a drive device for another apparatus. In this case, when the rotation amount on the operation shaft 7 side is constant, the bump rubbers 59 and 61 and the limit switches 71 and 73 can be omitted.

  Even when the bump rubbers 59 and 61 are omitted, the inertial rotation when the electric motor 15 stops can be allowed by the coil springs 55 and 57, and the force due to the inertial rotation can be buffered.

  The coil spring that urges the drive shaft 13 to the original position may use other urging means such as air, hydraulic pressure, magnetic force, or the like.

  As the detection means, a pressure sensor or the like can be used instead of the limit switches 71 and 73.

  The worm wheel 9 can be integrally attached to the operation shaft 7 side.

  An actuator other than an electric motor can be used as the actuator.

  The driven member can also be applied to a member that reciprocates by rotation of the operation shaft.

(Example 1) which is the principal part top view of the parking lock apparatus which made a part the cross section. It is a side view of the parking lock device which made a section into a part (example 1). (Example 1) which is an expanded sectional view of a relay shaft periphery. (Example 2) which is the principal part top view of the parking lock apparatus which made a part the cross section. (Example 2) which is a side view of the parking lock apparatus which made one part a cross section. (Example 3) which is an expanded sectional view of a relay shaft periphery. (Example 3) which is a front view of a spring receiver. It is a top view of the parking lock apparatus which made a part the section (conventional example).

Explanation of symbols

3 Driving device 5 Lock plate (driven member)
7 Operation shaft 9 Worm wheel 11 Worm 13 Drive shaft 15 Electric motor (actuator)
35 Taper shaft (friction engagement part)
41 Tapered hole (friction engagement part)
55, 57 Coil spring (biasing means)
71, 73 Limit switch (detection means)
87 Controller (drive control means)

Claims (2)

An operation shaft that rotates to operate the lock plate between the lowered position and the upper lock position and can be interlocked with rotation by the rotational force received by the lock plate when the vehicle rides on the lock plate due to unauthorized departure;
A worm wheel provided coaxially on the operating shaft side;
A drive shaft provided with a worm that is arranged orthogonal to the operation shaft and meshes with the worm wheel;
A parking lock device comprising an actuator for rotationally driving the drive shaft,
The drive shaft is rotationally engaged with the actuator, and the worm does not rotate by meshing with the rotation of the worm wheel so that the lock plate can be lowered from the upper lock position when the actuator is stopped. It is configured to enable movement in the direction along the rotation axis of the drive shaft by moving in the direction along the rotation axis as it is,
Biasing means for biasing the drive shaft to the original position side of the direction along the rotational axis is provided,
Between the operation shaft and the worm wheel, a friction engagement portion that allows relative rotation with a predetermined relative rotational force between the two after the urging means has bottomed is provided,
A detecting means for detecting a predetermined range of movement in the direction along the rotational axis of the drive shaft when the actuator is driven;
Drive control means for stopping the drive by the actuator by detection of the detection means is provided,
A parking lock device characterized by that. The parking lock device according to claim 1,
On the fixed side that supports the drive shaft or the drive shaft, a cushioning material is provided,
The detection is performed by a buffer material contacting the detection means.
A parking lock device characterized by that.

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