JP2011143893A - Parking lock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive parking lock device without using an expensive actuator and a high-degree motor control circuit. <P>SOLUTION: When guiding a lock pole 3 to a lock position from an unlocked position, when a positioning plate 5 rotates and a roller R is positioned in a first position of an outer peripheral surface 5a, a brush motor M is made to stop. Afterwards, the roller R independently rotates the positioning plate 5 in the counterclockwise direction by counterclockwise component force of elastic force of a positioning spring SP2 applied to the outer peripheral surface 5a. When guiding the lock pole 3 to the unlocked position from the locked position, when the positioning plate 5 rotates and the roller R is positioned in a second position of the outer peripheral surface 5a, the brush motor M is made to stop. Afterwards, the roller R independently rotates the positioning plate 5 in the clockwise direction by clockwise component force of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a parking lock device.

  2. Description of the Related Art Conventionally, a vehicle transmission device includes a parking lock device that engages a parking gear and a lock pole provided inside the transmission device to prevent the vehicle from moving carelessly when the shift lever is shifted to the P range. It has been.

  In this type of parking lock device, for example, as shown in Patent Document 1, when an actuator (motor) rotates a detent plate via a control rod, the automatic transmission control device and the park rod are simultaneously slid. It is configured as follows. When the automatic transmission control device is in the P range by driving the actuator, a conical lock cam provided at the tip of the park rod is displaced to a lock position where the lock pawl meshes with the parking gear. As a result, the parking gear engaged with the lock pole is prohibited from rotating and the rotation of the output shaft of the automatic transmission is also restricted. At this time, the displacement of the detent plate is positioned by the detent spring with roller and held in the P range.

JP 2008-39094 A

  By the way, the control rod rotated by the actuator is directly connected to the detent plate, and the detent plate is directly connected to the park rod to which the lock cam is fixed. That is, the position of the control rod (that is, the rotational position of the motor) is directly connected to the position of the lock cam that engages with the parking lock pole.

  Therefore, high accuracy is required for the positioning accuracy of the control rod by the actuator, and high-precision and complicated control such as PWM control and PID control is performed using a high-precision sensor such as a rotary encoder. As a result, the cost of the parking lock device has been increased.

  One method for avoiding this is to select an actuator motor having a small non-driving torque as the actuator and improve the accuracy of range switching by positioning the detent plate by the elastic force of the detent spring. However, in this case, it is necessary to reduce the cogging torque of the actuator motor.

  As this solution, the use of a motor that does not generate cogging torque, such as an SR motor or a coreless motor, is considered. However, this method increases the cost of the motor and makes it difficult to reduce the cost of the parking lock device.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to control the parking gear to be locked and unlocked at low cost without using an expensive actuator and an advanced motor control circuit. An object of the present invention is to provide a parking lock device that can be used.

  In the invention according to claim 1, the positioning plate that guides the lock pole to the two positions of the lock position that engages with the parking gear and the unlock position that releases the engagement, and forward and backward rotation by forward and reverse rotation of the motor, A gear for reciprocally rotating the positioning plate to guide the lock pole to the two positions; a first fitting portion and a second fitting portion formed on both sides of an outer peripheral surface of the positioning plate; And a fitting member that is slidably pressed against an outer peripheral surface and fitted into the first fitting portion or the second fitting portion to hold the lock pawl in the lock position or the unlock position. A parking lock device, wherein the gear is rotatably supported on a rotating shaft of the positioning plate so that the positioning plate and the gear rotate relative to each other, and a driven lever is fixed to the rotating shaft of the positioning plate; Said An engaging member formed on the moving lever, and a first engaging portion that rotates and engages the engaging member with respect to the engaging member from one direction, and rotates the driven lever in the one direction; A second engagement portion that rotates and engages with the engagement member from the other direction to rotate the driven lever in the other direction, and forms a first outer peripheral surface of the rotated positioning plate. When the position or the second position reaches the fitting member, the positioning plate is rotated by the elastic force of the fitting member, and the fitting member is moved to the first fitting portion of the positioning plate. Or it was made to fit in the said 2nd fitting part.

  According to the first aspect of the present invention, the gear rotates in one direction by the motor. By the rotation of the gear in one direction, the first engagement portion of the gear engages with the engagement member of the driven lever, whereby the driven lever and the positioning plate are rotated in one direction. Then, when the fitting member is located at the first position on the outer peripheral surface of the rotating positioning plate, the positioning plate is rotated in one direction by the elastic force of the fitting member, and the lock pole is guided to the lock position. To do.

  Further, the gear rotates in the other direction by the motor. By the rotation of the gear in the other direction, the second engagement portion of the gear is engaged with the engagement member of the driven lever, so that the driven lever and the positioning plate are rotated in the other direction. When the fitting member is positioned at the second position on the outer peripheral surface of the rotating positioning plate, the positioning plate is rotated in the other direction by the elastic force of the fitting member, and the lock pole is set to the unlocked position. invite.

  According to a second aspect of the present invention, in the parking lock device according to the first aspect, the driven lever shuts off the driving power of the motor when the positioning plate is rotated to the first position. A first detected portion that turns on a first switch that outputs a signal of the second, and a second signal that outputs a signal for shutting off the driving power of the motor when the positioning plate is rotated to the second position. And a second detected part for turning on the switch.

  According to the second aspect of the present invention, when the positioning plate is rotated in one direction and the fitting member is positioned at the first position on the outer peripheral surface of the positioning plate, the first switch is turned on to drive the motor. Shut off the power and stop the motor. Thereafter, the positioning plate is rotated in one direction by the elastic force of the fitting member to guide the lock pole to the lock position.

  When the positioning plate rotates in the other direction and the fitting member is positioned at the second position on the outer peripheral surface of the positioning plate, the second switch is turned on to shut off the motor drive power and stop the motor. Thereafter, the positioning plate is rotated in the other direction by the elastic force of the fitting member, and the lock pole is guided to the unlock position.

  According to a third aspect of the present invention, in the parking lock device according to the first or second aspect, the gear is a sector gear, and a long fitting hole is formed in the circumferential direction, and the follower lever of the driven lever is formed in the fitting hole. The engaging member is inserted so as to be movable in the circumferential direction, and both inner surfaces facing each other in the circumferential direction of the fitting port are defined as the first engaging portion and the second engaging portion.

  According to the third aspect of the present invention, the engagement member of the driven lever that is inserted into the fitting port of the sector gear is rotated in one direction of the sector gear so that one side inner surface (first engagement) of the fitting port. Engage with the joint. Thereby, the driven lever and the positioning plate are rotated in one direction. Then, when the positioning plate rotates and the fitting member is positioned at the first position on the outer peripheral surface of the positioning plate, the positioning plate rotates in one direction by the elastic force of the fitting member, and locks the lock pole. Guide to position.

  The engaging member of the driven lever inserted through the fitting port is engaged with the other inner side surface (second engagement portion) of the fitting port by turning in the other direction of the sector gear. As a result, the driven lever and the positioning plate are rotated in the other direction. When the positioning plate rotates and the second position of the outer peripheral surface of the positioning plate reaches the fitting member, the positioning plate is rotated in the other direction by the elastic force of the fitting member, and the lock pole is unlocked. Guide to the lock position.

  According to a fourth aspect of the present invention, in the parking lock device according to any one of the first to third aspects, the fitting member is attached to a distal end portion of a positioning spring, and the elastic force of the positioning spring The outer peripheral surface of the positioning plate is always elastically pressed, and when the positioning plate is rotated in one direction to the first position, the positioning plate is rotated in one direction by the elastic pressure, and the first When the fitting member is fitted into the fitting portion and the positioning plate is rotated in the other direction to the second position, the second fitting is performed by rotating the positioning plate in the other direction by the elastic force. The fitting member is fitted in the joint.

  According to the invention described in claim 4, the fitting member rotates the positioning plate in one direction by the elastic force of the positioning spring, and guides the lock pole to the lock position. Further, the fitting member rotates the positioning plate in the other direction by the elastic force of the positioning spring to guide the lock pole to the unlock position.

According to a fifth aspect of the present invention, in the parking lock device according to the fourth aspect, the positioning spring is a leaf spring.
According to the fifth aspect of the present invention, the fitting member rotates the positioning plate in one direction by the elastic force of the leaf spring to guide the lock pole to the lock position. Further, the fitting member rotates the positioning plate in the other direction by the elastic force of the leaf spring, and guides the lock pole to the unlock position.

  According to the present invention, an inexpensive parking lock device can be provided.

It is a principal part whole perspective view for demonstrating a parking lock apparatus. It is a partially cutaway perspective view of the drive device of the parking lock device. It is a principal part disassembled perspective view of a drive device. It is the disassembled perspective view which looked at the housing case of the drive device from back. It is a partially cutaway front view of the positioning plate for explaining the positioning plate. It is a front view of a driven lever for explaining a driven lever. It is a front view of the sector gear for demonstrating a sector gear.

Hereinafter, embodiments of a parking lock device of the present invention will be described with reference to the drawings.
FIG. 1 is an overall perspective view of the main part of the parking lock device.
The parking lock device 1 includes a parking gear 2 and a lock pole 3 that engages with and disengages from the parking gear 2. The parking gear 2 and the lock pole 3 are provided in a housing case (not shown) of a transmission provided in the vehicle.

  The parking gear 2 is fixed to an engine crankshaft (not shown) inserted through a housing case of the transmission, and rotates together with the crankshaft. The parking gear 2 is inhibited from rotating when the engaging claw 3 a of the lock pole 3 is engaged with the teeth 2 a of the parking gear 2.

  The lock pole 3 is disposed adjacent to the parking gear 2 and is swingably supported by an intermediate plate (not shown) fixed in the housing case of the transmission. The lock pole 3 is supported at its base end so as to be rotatable with respect to a support shaft 4 provided on the intermediate plate, and is rotatable about a central axis C1 of the support shaft 4 as a rotation center.

  A locking claw 3a is formed at an intermediate portion of the lock pole 3 on the parking gear 2 side. The lock pole 3 rotates to the parking gear 2 side and is guided to a position where the locking claw 3a meshes with the teeth 2a of the parking gear 2 (hereinafter referred to as a lock position). The lock pawl 3 prevents the parking gear 2 from rotating by the locking claw 3a being guided to the lock position.

  On the contrary, the lock pawl 3 rotates in a direction away from the teeth 2a of the parking gear 2, and the locking claw 3a releases the meshing with the teeth 2a of the parking gear 2 as shown in FIG. Hereinafter, it is guided to the unlock position. The lock pawl 3 is configured to allow the parking gear 2 to rotate by the locking claw 3a being guided to the unlock position.

  A positioning plate 5 is provided at a position adjacent to the lock pole 3. The positioning plate 5 is a substantially fan-shaped plate body, and a base end portion thereof is fixed to a rotating shaft 7 of a driving device 6 that is inserted from the housing case of the transmission into the case. The positioning plate 5 rotates integrally with the rotation shaft 7 of the drive device 6 in the forward and reverse directions.

  The positioning plate 5 has a connecting arm 8 extending from its base end, and a park rod 9 is rotatably connected to the connecting arm 8. The park rod 9 has a rod portion 9a formed by bending the base end portion into an L shape and further bending the bent end portion into an L shape. The rod portion 9a is formed to extend to the anti-parking gear 2 side of the lock pole 3. The park rod 9 reciprocates in the direction in which the rod portion 9 a intersects the lock pole 3 as the positioning plate 5 reciprocates.

  A coil spring SP1 is inserted into the rod portion 9a of the park rod 9. The coil spring SP1 has a base end engaged with a stopper piece 9b formed on the rod portion 9a, and a distal end engaged with a control cam 10 that is slidably inserted into the rod portion 9a.

  The control cam 10 is always elastically pressed to the tip end side of the rod portion 9a by the coil spring SP1. The control cam 10 is configured such that the tapered cone-shaped cam surface 10 a is in sliding contact with the surface of the lock pole 3 on the side opposite to the parking gear 2. Accordingly, when the rod portion 9 a of the park rod 9 reciprocates as the positioning plate 5 reciprocates, the control cam 10 reciprocates while sliding the surface of the lock pole 3 on the side opposite to the parking gear 2. As a result, based on the sliding of the control cam 10, the lock pole 3 rotates around the central axis C <b> 1 of the support shaft 4. That is, the lock pole 3 is rotated between the lock position and the unlock position by the rotation of the positioning plate 5.

  More specifically, in FIG. 1, when the positioning plate 5 rotates counterclockwise, the park rod 9 and the control cam 10 move to the lock pole 3 side. As the control cam 10 moves, the lock pole 3 rotates to the parking gear 2 side. Thereby, the locking claw 3a of the lock pole 3 is guided from the unlock position to the lock position.

  On the other hand, when the positioning plate 5 rotates in the clockwise direction from the lock position, the park rod 9 and the control cam 10 move backward to the anti-lock pole 3 side. As the control cam 10 moves backward, the lock pole 3 rotates to the anti-parking gear 2 side. As a result, the locking claw 3a of the lock pole 3 is guided from the locked position to the unlocked position.

In the present embodiment, the lock pole 3 is elastically applied in an anticlockwise direction in FIG. 1 by an elastic member (not shown), and constantly presses the control cam 10.
As shown in FIG. 5, the positioning plate 5 is provided with a lock holding concave portion 11 as a first fitting portion and an unlock holding concave portion 12 as a second fitting portion, as shown in FIG. ing. The lock holding recess 11 is formed on one side of the outer peripheral surface 5a of the positioning plate 5 and in the clockwise direction in FIGS. On the other hand, the unlock holding recess 12 is formed on one side of the outer peripheral surface 5a of the positioning plate 5 and on the counterclockwise direction side in FIGS.

  The shape of the outer peripheral surface 5a between the lock holding recess 11 and the unlock holding recess 12 is, as shown in FIG. 5, a mountain shape with the lock holding recess 11 and the unlock holding recess 12 interposed therebetween, and is the highest. There is an asymmetrical chevron shape in which the highest vertex P0 is biased toward the lock holding recess 11 side. That is, the outer peripheral surface 5a on the lock holding recess 11 side is formed with a steep slope with the most apex P0 as a boundary, and the outer peripheral surface 5a on the unlock holding recess 12 side is formed with a gentle slope.

  As shown in FIG. 1, a roller R provided at the tip of the positioning spring SP2 is elastically pressed on the outer peripheral surface 5a of the positioning plate 5. The positioning spring SP2 is made of a plate spring, and its base end is fixed to an intermediate plate (not shown), and always presses the roller R provided at the tip against the outer peripheral surface 5a of the positioning plate 5.

  When the positioning plate 5 is at the unlock position shown in FIG. 1, the roller R of the positioning spring SP <b> 2 is fitted into the unlock holding recess 12. On the contrary, when the positioning plate 5 is in the locked position, the roller R of the positioning spring SP2 is fitted in the lock holding recess 11.

  More specifically, when the positioning plate 5 is rotated counterclockwise by the rotating shaft 7 of the driving device 6 from the state where the positioning plate 5 is in the unlocked position shown in FIG. 1, the roller R of the positioning spring SP2 is held unlocked. The outer peripheral surface 5 a is slidably contacted from the recess 12 toward the lock holding recess 11. When the roller R is positioned on the inclined surface at the predetermined first position P1 shown in FIG. 5 from the unlock holding recess 12 beyond the highest vertex P0 of the outer peripheral surface 5a, the roller pressed against the outer peripheral surface 5a. R rotates the positioning plate 5 in the counterclockwise direction by a component force in the counterclockwise direction of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a. As a result, the roller R is fitted into the lock holding recess 11.

  On the contrary, when the positioning plate 5 is rotated clockwise by the rotation shaft 7 of the driving device 6 from the state where the positioning plate 5 is in the locked position, the roller R of the positioning spring SP2 is moved from the lock holding recess 11 to the unlock holding recess 12. The outer peripheral surface 5a is slidably contacted. When the roller R is positioned on the inclined surface at the predetermined second position P2 shown in FIG. 5 from the lock holding recess 11 beyond the outermost vertex P0 of the outer peripheral surface 5a, the roller R is positioned on the outer peripheral surface 5a. The positioning plate 5 is rotated clockwise by a component force in the clockwise direction of the elastic force of the spring SP2. As a result, as shown in FIG. 1, the roller R is fitted into the unlock holding recess 12.

Next, the drive device 6 that rotationally drives the positioning plate 5 will be described.
The drive device 6 is casing in a housing case 20 adjacent to the transmission. The housing case 20 includes a base housing 20a and a top housing 20b. As shown in FIG. 4, a bearing boss 21 that rotatably supports the rotating shaft 7 is formed on the base housing 20a. The shaft 7 protrudes so as to be rotatable and immovable in the axial direction.

  As shown in FIGS. 2 and 3, a driven lever 22 is connected and fixed to the rotating shaft 7 in the housing case 20. Therefore, the driven lever 22 rotates integrally with the positioning plate 5 fixed to the rotating shaft 7. As shown in FIGS. 3 and 6, the driven lever 22 is formed with an engaging protrusion 23 as an engaging member protruding from the lever body. Further, a first contact piece S1 as a first detected part and a second contact piece S2 as a second detected part are formed to extend on both sides of the distal end of the driven lever 22, respectively. The first contact piece S1 and the second contact piece S2 are respectively corresponding first switches installed in the housing case 20 based on the rotation position when the driven lever 22 rotates about the rotation shaft 7. The first limit switch SW1 as a second switch and the second limit switch SW2 as a second switch are turned on / off.

Further, a brush motor M as a motor is fixed to the base housing 20a, and the output shaft Ma is protruded into the housing case 20.
A first helical gear G1 is fixed to the output shaft Ma of the brush motor M, and the first helical gear G1 is drivingly connected to the intermediate gear mechanism. As shown in FIG. 2, the intermediate gear mechanism has a second helical gear G2 and a spur gear-like drive gear G3, and is rotatably supported by a support shaft 24 erected on the intermediate plate 20c. The second helical gear G2 and the spur gear-like drive gear G3 are connected and fixed to each other so as to rotate integrally with the support shaft 24. And the 2nd helical gear G2 meshes with the 1st helical gear G1.

  On the other hand, the drive gear G3 meshes with the gear portion 25a of the sector gear 25 as a gear provided side by side with the driven lever 22. The sector gear 25 is supported such that the base end boss portion is rotatable with respect to the rotation shaft 7. Therefore, by rotating the brush motor M, the driving force of the brush motor M is transmitted to the sector gear 25 via the intermediate gear mechanism. As a result, the sector gear 25 rotates about the rotation shaft 7 with respect to the rotation shaft 7.

  A sector-shaped fitting opening 26 is formed through the sector gear 25. Both the outer side and the inner side of the fitting port 26 are arcuate and are arc sides centered on the central axis of the rotation shaft 7. As shown in FIG. 2, an engagement protrusion 23 of a driven lever 22 provided along with the sector gear 25 is inserted into the fitting port 26.

  In the present embodiment, when the lock pole 3 is in the unlocked position and the engagement protrusion 23 of the driven lever 22 is positioned in the circumferential center position Pc of the fitting port 26 shown in FIG. As shown in FIG. 1, the unlock holding recess 12 is assembled so that the roller R of the positioning spring SP2 is fitted.

  In order to guide the lock pole 3 to the locked position from the state where the lock pole 3 is in the unlocked position and the engagement protrusion 23 of the driven lever 22 is positioned at the center position Pc of the fitting port 26, a brush The motor M is rotated counterclockwise in FIGS.

  That is, when the brush motor M is rotated in the counterclockwise direction and the sector gear 25 is rotated in the counterclockwise direction in FIGS. 2 and 7, the sector gear 25 causes the engagement protrusion 23 to move into the fitting port 26. It rotates in a state of being interposed in the. When the engagement protrusion 23 of the driven lever 22 is at the center position Pc of the fitting port 26, the first contact piece S1 of the driven lever 22 is in contact with the first limit switch SW1 and turned on, and the second contact piece S2 is The second limit switch SW2 is set so as to be separated from the second limit switch SW2.

  Eventually, when the first side surface 26a (see FIG. 7) as the first engaging portion in the clockwise direction of the fitting port 26 engages with the engaging projection 23, the engagement lever 23 and the driven lever together with the rotation of the sector gear 25. 22 is also rotated counterclockwise. As the driven lever 22 rotates in the counterclockwise direction, the positioning plate 5 also rotates in the counterclockwise direction in FIGS.

  By rotation of the positioning plate 5 in the counterclockwise direction, the roller R of the positioning spring SP2 is detached from the unlock holding recess 12 and slidably contacts the outer peripheral surface 5a toward the lock holding recess 11.

  When the roller R is positioned at the predetermined second position P2 before the roller R exceeds the highest vertex P0 of the outer peripheral surface 5a from the unlock holding recess 12, the first contact piece S1 of the driven lever 22 is moved to the first limit switch SW1. The first limit switch SW1 is turned off from on.

  Further, when the positioning plate 5 is rotated and the roller R is positioned at the first position P1 that is predetermined beyond the highest vertex P0 of the outer peripheral surface 5a, the second contact piece S2 of the driven lever 22 is moved to the second limit switch. The second limit switch SW2 is brought into contact with SW2 and turned on from OFF. At this time, when the second limit switch SW2 is turned on from the off state, the driving power source of the brush motor M is controlled to be cut off.

  When the roller R is positioned at the first position P1 of the outer peripheral surface 5a, the roller R moves the positioning plate 5 counterclockwise by the counterclockwise component of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a. Turn to. As a result, the engaging protrusion 23 engaged with the first side surface 26a of the fitting port 26 is separated from the first side surface 26a. Eventually, the roller R fits into the lock holding recess 11.

  When the driven lever 22 (positioning plate 5) moves relative to the sector gear 25 in the counterclockwise direction and the engaging protrusion 23 of the driven lever 22 is positioned at the center position Pc of the fitting port 26, the roller R Fits into the lock retaining recess 11. Then, the engagement protrusion 23 of the driven lever 22 stops at the center position Pc of the fitting port 26.

  On the other hand, in order to guide the lock pole 3 to the unlock position from the state where the lock pole 3 is at the lock position and the engagement protrusion 23 of the driven lever 22 is located at the center position Pc of the fitting port 26, The brush motor M is rotated in the clockwise direction in FIG.

  That is, when the sector motor 25 is rotated in the clockwise direction in FIGS. 2 and 7 by rotating the brush motor M in the clockwise direction, the sector gear 25 causes the engaging protrusion 23 to enter the fitting port 26. It rotates in the intervening state. At this time, the engagement protrusion 23 of the driven lever 22 is at the center position Pc of the fitting port 26, and the second contact piece S2 of the follower lever 22 is in contact with the second limit switch SW2 and is in the on state. S1 is separated from the first limit switch SW1 and is in an off state.

  Eventually, when the second side surface 26b (see FIG. 7) as the second engagement portion in the counterclockwise direction of the fitting port 26 is engaged with the engagement protrusion 23, the engagement is driven along with the rotation of the sector gear 25. The lever 22 is also rotated in the clockwise direction. When the driven lever 22 is rotated in the clockwise direction, the positioning plate 5 is also rotated in the clockwise direction in FIGS.

  By rotating the positioning plate 5 in the clockwise direction, the roller R of the positioning spring SP2 is detached from the lock holding recess 11 and slidably contacts the outer peripheral surface 5a toward the unlock holding recess 12.

  When the roller R is positioned at the first predetermined position P1 before exceeding the highest vertex P0 of the outer peripheral surface 5a from the lock holding recess 11, the second contact piece S2 of the driven lever 22 is moved from the second limit switch SW2. Separate. As a result, the second limit switch SW2 is turned off from on.

  Further, when the positioning plate 5 is rotated and the roller R is located at a predetermined second position P2 beyond the most apex P0 of the outer peripheral surface 5a, the first contact piece S1 of the driven lever 22 is moved to the first limit switch. It comes into contact with SW1. As a result, the first limit switch SW1 is turned on from off. At this time, when the first limit switch SW1 is turned on from the off state, the drive power source of the brush motor M is controlled to be cut off.

  When the roller R exceeds the second position P2 of the outer peripheral surface 5a, the roller R moves the positioning plate 5 in the clockwise direction by the clockwise component of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a. Rotate. As a result, the roller R is fitted into the unlock holding recess 12. And the engagement protrusion 23 which was engaging with the 1st side surface 26a of the fitting port 26 spaces apart from the 1st side surface 26a. Eventually, the roller R fits into the unlock holding recess 12.

  Further, when the driven lever 22 (positioning plate 5) moves relative to the sector gear 25 in the clockwise direction and the engaging protrusion 23 of the driven lever 22 is positioned at the center position Pc of the fitting port 26, the roller R is It fits in the unlock holding recess 12. Then, the engagement protrusion 23 of the driven lever 22 stops at the center position Pc of the fitting port 26.

  The driving circuit of the brush motor M is a known driving circuit, and for example, an H-type bridge circuit using four power MOS transistors can be considered. Then, when the first limit switch SW1 and the second limit switch SW2 are turned on / off, the four power MOS transistors are appropriately turned on / off to rotate the brush motor M forward / reversely or to shut off the drive power supply. Just do it.

Next, the operation of the parking lock device configured as described above will be described.
(1) From the unlocked state to the locked state When in the unlocked state, in the unlocked state, the lock pole 3 is in the unlocked position as shown in FIG. Further, as shown in FIG. 7, the engagement protrusion 23 of the driven lever 22 is positioned at the center position Pc of the fitting port 26 of the sector gear 25. Further, as shown in FIG. 1, the roller R of the positioning spring SP2 is fitted in the unlock holding recess 12 of the positioning plate 5.

(Shift lever to P range)
When the shift lever is shifted to the P range, power is supplied to the brush motor M, and the brush motor M rotates counterclockwise. Due to this counterclockwise rotation, the sector gear 25 rotates counterclockwise in FIGS. At this time, the sector gear 25 rotates in a state where the engagement protrusion 23 of the driven lever 22 is interposed in the fitting port 26. Therefore, in this state, the driven lever 22 does not rotate, so that the first contact piece S1 is in contact with the first limit switch SW1 (ON), and the second contact piece S2 is in a separated state from the second limit switch SW2. (Off).

(Rotation of the positioning plate 5 by the rotation of the driven lever 22)
As the sector gear 25 rotates counterclockwise, the first side surface 26 a of the fitting port 26 eventually engages with the engagement protrusion 23 of the driven lever 22. By this engagement, the driven lever 22 is rotated counterclockwise against the component force in the clockwise direction of the elastic force of the positioning spring SP2. As the driven lever 22 rotates counterclockwise, the positioning plate 5 also rotates counterclockwise in FIGS.

  As the positioning plate 5 rotates counterclockwise, the park rod 9 and the control cam 10 move to the lock pole 3 side, and the locking claw 3a of the lock pole 3 is guided from the unlock position to the lock position. .

  Further, the rotation of the positioning plate 5 in the counterclockwise direction causes the roller R of the positioning spring SP <b> 2 to come off the unlock holding recess 12 and slidably contact the outer peripheral surface 5 a toward the lock holding recess 11.

(The first limit switch SW1 is turned off)
When the roller R reaches the predetermined second position P2 before exceeding the highest vertex P0 of the outer peripheral surface 5a from the unlock holding recess 12, the first contact piece S1 of the driven lever 22 is separated from the first limit switch SW1. Thus, the first limit switch SW1 is turned off from on.

(The second limit switch SW2 is turned on)
Further, when the positioning plate 5 is rotated and the roller R is positioned at the first position P1 that is predetermined beyond the highest vertex P0 of the outer peripheral surface 5a, the second contact piece S2 of the driven lever 22 is moved to the second limit switch SW2. The second limit switch SW2 is turned on from off. When the second limit switch SW2 is turned on from off, the power to the brush motor M is cut off and the brush motor M (sector gear 25) stops.

  At this time, the sector gear 25 and the driven lever 22 are not directly connected in a state where the first side surface 26 a of the fitting port 26 is only engaged with the engaging protrusion 23. Therefore, the roller R independently rotates the positioning plate 5 (driven lever 22) in the counterclockwise direction by the component force in the counterclockwise direction of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a.

(Separation of the engagement protrusion 23 from the first side surface 26a)
By the independent rotation of the positioning plate 5, the engaging protrusion 23 engaged with the first side surface 26 a of the fitting port 26 is separated from the first side surface 26 a, and the roller R is fitted into the lock holding recess 11. . When the roller R is fitted in the lock holding recess 11, the lock pole 3 is guided to the lock position.

On the other hand, the driven lever 22 (positioning plate 5) stops when the engaging protrusion 23 of the driven lever 22 is located at the center position Pc of the fitting port 26.
(2) From the locked state to the unlocked state When the lock state is in effect, the lock pole 3 is in the locked position in the locked state. Further, the engagement protrusion 23 of the driven lever 22 is located at the center position Pc of the fitting port 26 of the sector gear 25. Furthermore, the roller R of the positioning spring SP2 is fitted in the lock holding recess 11 of the positioning plate 5.

(Shift lever to a range other than P range)
When the shift lever is shifted from the P range to a range other than the P range, power is supplied to the brush motor M, and the brush motor M rotates in the clockwise direction. By this clockwise rotation, the sector gear 25 rotates clockwise in FIGS. 2 and 7. At this time, the sector gear 25 rotates in a state where the engagement protrusion 23 of the driven lever 22 is interposed in the fitting port 26. Therefore, in this state, the driven lever 22 does not rotate, so the second contact piece S2 of the driven lever 22 is in contact with the second limit switch SW2 (on), and the first contact piece S1 is the first limit switch. It is in a separated state (off) with SW1.

(Rotation of the positioning plate 5 by the rotation of the driven lever 22)
As the sector gear 25 rotates in the clockwise direction, the second side surface 26 b of the fitting port 26 eventually engages with the engagement protrusion 23 of the driven lever 22. By this engagement, the driven lever 22 is rotated in the clockwise direction against the counterclockwise component of the elastic force of the positioning spring SP2. As the driven lever 22 rotates in the clockwise direction, the positioning plate 5 also rotates in the clockwise direction in FIGS.

  The clockwise rotation of the positioning plate 5 causes the park rod 9 and the control cam 10 to move backward, and the locking claw 3a of the lock pole 3 is guided from the lock position to the unlock position.

  Further, the rotation of the positioning plate 5 in the clockwise direction causes the roller R of the positioning spring SP2 to come out of the lock holding recess 11 and to slidably contact the outer peripheral surface 5a toward the unlock holding recess 12.

(The second limit switch SW2 is turned on)
When the roller R is positioned at the first predetermined position P1 before the roller holding recess 11 exceeds the highest vertex P0 of the outer peripheral surface 5a, the second contact piece S2 of the driven lever 22 is separated from the second limit switch SW2. The second limit switch SW2 is turned off from on.

(The first limit switch SW1 is turned on)
Further, when the positioning plate 5 is rotated and the roller R is positioned at a predetermined second position P2 beyond the outermost vertex P0 of the outer peripheral surface 5a, the first contact piece S1 of the driven lever 22 is moved to the first limit switch SW1. The first limit switch SW1 is turned on from off. When the first limit switch SW1 is turned on from off, the power to the brush motor M is cut off and the brush motor M (sector gear 25) stops.

  At this time, the sector gear 25 and the driven lever 22 are not directly connected in a state where the second side surface 26 b of the fitting port 26 is merely engaged with the engaging protrusion 23. For this reason, the roller R independently rotates the positioning plate 5 (driven lever 22) in the clockwise direction by the component force in the clockwise direction of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a.

(Separation of the engagement protrusion 23 from the first side surface 26a)
By the rotation of the positioning plate 5 alone, the engaging protrusion 23 engaged with the second side surface 26b of the fitting port 26 is separated from the second side surface 26b, and the roller R is engaged with the unlock holding recess 12. To do. When the roller R is fitted into the unlock holding recess 12, the lock pole 3 is guided to the unlock position as shown in FIG.

On the other hand, the driven lever 22 (positioning plate 5) stops when the engaging protrusion 23 of the driven lever 22 is located at the center position Pc of the fitting port 26.
Next, effects of the embodiment configured as described above will be described below.
(1) According to the above embodiment, when guiding the lock pole 3 from the unlock position to the lock position, the brush motor M is controlled to rotate until the roller R is fitted in the lock holding recess 11 of the positioning plate 5. There is no need.

  That is, when the positioning plate 5 is rotated together with the driven lever and the roller R is positioned at the first position P1 beyond the highest vertex P0 of the outer peripheral surface 5a, the second limit on the second contact piece S2 of the driven lever 22 is reached. The switch SW2 is turned on, the drive power to the brush motor M is cut off, and the brush motor M is stopped. Thereafter, until the roller R is fitted into the lock holding recess 11, the positioning plate 5 is moved in the counterclockwise direction by the counterclockwise component of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a. It was made to rotate. That is, positioning of the positioning plate 5 was left to the positioning spring SP2 and the positioning plate 5.

  Therefore, high-precision positioning accuracy with respect to the roller R of the positioning plate 5 by the brush motor M is not required. In other words, the second limit switch SW2 detects whether or not the roller R has reached the first position P1 beyond the highest vertex P0 of the outer peripheral surface 5a of the positioning plate 5, and the power supply to the brush motor M is cut off. It's okay.

As a result, it is possible to provide an inexpensive parking lock device without using a high-precision and expensive sensor such as a rotary encoder and without performing sophisticated and complicated motor control such as PWM control and PID control. . That is, an inexpensive second limit switch SW2 is used, and for example, a simple motor drive circuit that only turns on / off the power MOS transistor may be used.
(2) According to the above embodiment, when guiding the lock pole 3 from the locked position to the unlocked position, the brush motor M is controlled to rotate until the roller R is fitted in the unlock holding recess 12 of the positioning plate 5. There is no need to do.

  That is, when the positioning plate 5 is rotated together with the driven lever and the roller R is positioned at the second position P2 beyond the highest vertex P0 of the outer peripheral surface 5a, the first limit is set at the first contact piece S1 of the driven lever 22. The switch SW1 is turned on, the drive power to the brush motor M is shut off, and the brush motor M is stopped. Thereafter, until the roller R is fitted into the unlock holding recess 12, the positioning plate 5 is independently rotated in the clockwise direction by the clockwise component of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a. It was made to move. That is, positioning of the positioning plate 5 was left to the positioning spring SP2 and the positioning plate 5.

  Therefore, high-precision positioning accuracy with respect to the roller R of the positioning plate 5 by the brush motor M is not required. In other words, the first limit switch SW1 detects whether or not the roller R has reached the predetermined second position P2 beyond the highest vertex P0 of the outer peripheral surface 5a of the positioning plate 5 to supply power to the brush motor M. Just shut it off.

As a result, it is possible to provide an inexpensive parking lock device without using a high-precision and expensive sensor such as a rotary encoder and without performing sophisticated and complicated motor control such as PWM control and PID control. . That is, an inexpensive first limit switch SW1 may be used, and for example, a simple motor drive circuit that only turns on and off the power MOS transistor may be used.
(3) According to the above embodiment, the driven lever 22 that rotates integrally with the positioning plate 5 is provided, and the driven lever 22 and the sector gear 25 are configured to rotate relative to each other. Then, the driven lever 22 and the sector gear 25 are driven in one direction when the sector gear 25 rotates a predetermined amount with respect to the driven lever 22 from one direction, and the sector gear 25 is driven in the other direction. When the lever 22 is rotated by a predetermined amount, the driven lever 22 is rotated in the other direction.

  That is, since the sector gear 25 (brush motor M) and the driven lever 22 (positioning plate 5) are not directly connected, the brush motor is not limited to the non-driving torque request value of the actuator motor that rotates the positioning plate 5, and is inexpensive. M can be implemented.

In addition, you may change the said embodiment as follows.
In the above embodiment, the first position P1 for cutting off the drive power to the brush motor M is set on the outer peripheral surface 5a of the positioning plate 5, and the second limit switch SW2 is turned on from off. The first position P1 is a counterclockwise component of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a when the brush motor M is stopped by shutting off the driving power to the brush motor M. As long as the positioning plate 5 is positioned on the inclined surface, the positioning plate 5 can be independently rotated counterclockwise. Needless to say, the first position P1 is appropriately changed by changing the shape of the outer peripheral surface 5a of the positioning plate 5.

  In the above embodiment, the second position P2 for cutting off the drive power to the brush motor M is set on the outer peripheral surface 5a of the positioning plate 5, and the first limit switch SW1 is turned on from off. This second position P2 is a clockwise component of the elastic force of the positioning spring SP2 applied to the outer peripheral surface 5a when the brush motor M is stopped by shutting off the drive power to the brush motor M. The positioning plate 5 may be located at an inclined surface that can be rotated in the clockwise direction independently. Needless to say, the second position P2 is appropriately changed by changing the shape of the outer peripheral surface 5a of the positioning plate 5.

  In the above embodiment, the drive circuit for the brush motor M is an H-type bridge circuit as an example. However, the drive circuit is not limited to the H-type bridge circuit and may be any drive circuit that rotates the brush motor M forward and backward. Anything. Further, it may be implemented by a motor drive circuit using a bipolar transistor instead of the power MOS transistor.

  In the above embodiment, the positioning spring SP2 is configured by a leaf spring, but may be implemented by a coil spring, for example. In this case, the roller R may be attached to the tip of the coil spring, and the roller R may be elastically pressed against the outer peripheral surface 5a of the positioning plate 5 by the elastic force of the coil spring.

  In the above embodiment, the brush motor M is used to rotate the sector gear 25. However, a motor other than the brush motor M may be used as long as it can rotate forward and backward.

  DESCRIPTION OF SYMBOLS 1 ... Parking lock apparatus, 2 ... Parking gear, 2a ... Teeth, 3 ... Lock pole, 3a ... Locking claw, 5 ... Positioning plate, 5a ... Outer peripheral surface, 6 ... Drive apparatus, 7 ... Rotating shaft, 8 ... Connection arm , 9 ... Park rod, 9a ... Rod portion, 10 ... Control cam, 11 ... Lock holding recess (first fitting portion), 12 ... Unlock holding recess (second fitting portion), 20 ... Housing case, 20a ... Base housing, 20b ... Top housing, 20c ... Intermediate plate, 22 ... Driven lever, 23 ... Engagement projection (engagement member), 24 ... Support shaft, 25 ... Sector gear (gear), 25a ... Gear part, 26 ... Fitting Abutment, 26a ... first side surface (first engagement portion), 26b ... second side surface (second engagement portion), M ... brush motor (motor), Ma ... output shaft, R ... roller (fitting member), G1 ... 1st helical gear, G2 ... 2nd Rical gear, G3 ... drive gear, P0 ... top, P1 ... first position, P2 ... second position, Pc ... center position, S1 ... first contact piece (first detected part), S2 ... second contact Piece (second detected portion), SP1... Coil spring, SP2... Positioning spring (plate spring), SW1... First limit switch (first switch), SW2... Second limit switch (second switch).

Claims (5)

A positioning plate that guides the lock pole to two positions: a lock position that meshes with the parking gear; and an unlock position where the meshing is released;
A gear that forwards and reverses by forward and reverse rotation of a motor, reciprocally rotates the positioning plate, and guides the lock pole to the two positions;
A first fitting portion and a second fitting portion formed on both sides of the outer peripheral surface of the positioning plate;
A fitting that is slidably pressed against the outer peripheral surface of the positioning plate to fit in the first fitting portion or the second fitting portion and hold the lock pole in the locked position or the unlocked position. A joint member;
A parking lock device having
The gear is rotatably supported on the rotation shaft of the positioning plate so that the positioning plate and the gear rotate relative to each other, and the driven lever is fixed to the rotation shaft of the positioning plate,
An engagement member formed on the driven lever; and a first engagement portion that rotates and engages the gear with respect to the engagement member from one direction and rotates the driven lever in the one direction. Forming a second engagement portion that rotates and engages with the engagement member from the other direction and rotates the driven lever in the other direction;
When the first position or the second position of the outer peripheral surface of the rotated positioning plate reaches the fitting member, the positioning plate is rotated by the elastic force of the fitting member, and the fitting is performed. A parking lock device, wherein a joint member is fitted to the first fitting portion or the second fitting portion of the positioning plate. The parking lock device according to claim 1,
The driven lever includes a first detected part that turns on a first switch that outputs a signal for shutting off the driving power of the motor when the positioning plate is rotated to the first position; A parking lock, comprising: a second detected portion that turns on a second switch that outputs a signal for shutting off the driving power of the motor when the plate is rotated to the second position. apparatus. In the parking lock device according to claim 1 or 2,
The gear is a sector gear, and has a long fitting port in the circumferential direction. The engagement member of the driven lever is inserted through the fitting port so as to be movable in the circumferential direction. The parking lock device, wherein both inner side surfaces are the first engagement portion and the second engagement portion. In the parking lock device according to any one of claims 1 to 3,
The fitting member is attached to the distal end portion of the positioning spring, and always elastically presses the outer peripheral surface of the positioning plate by the elastic force of the positioning spring.
When the positioning plate is rotated in one direction to the first position, the positioning plate is rotated in one direction by the elastic force so that the fitting member is fitted to the first fitting portion. When the positioning plate is rotated in the other direction to the second position, the positioning plate is rotated in the other direction by the elastic force, and the fitting member is fitted to the second fitting portion. A parking lock device characterized in that the parking lock device is provided. In the parking lock device according to claim 4,
The parking lock device, wherein the positioning spring is a leaf spring.

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