JP2006322489A - Electric parking lock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric parking lock device capable of releasing an engaging condition of a parking pole and a parking gear by manual operation, engaging the parking pole with the parking gear, simplifying a configuration, and reducing the number of parts. <P>SOLUTION: This electric parking lock device is provided with a ball screw member 11 fitted with play into a screw channel 9b formed in an output shaft 9a of an electric motor 9 and converting rotary movement of the output shaft 9a by driving the electric motor 9 into linear movement freely, a rod shaft 10 provided in parallel with the output shaft 9a and reciprocating and moving linearly and freely, a recessed part 12 and a connection member 13 provided between the ball screw member 11 and the rod shaft 10, and a parking pole operation mechanism 6 for engaging/disengaging a claw part 5a of the parking pole 5 with/from a tooth space 4a of the parking gear 4. This device is further provided with a manual operation lever 19 for moving the rod shaft 10 linearly and directly so as to reciprocate and move freely and a push-pull cable 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric parking lock device that locks a parking gear by engaging a parking pawl by driving an electric drive source when stopped (parking).

  As a parking lock device that engages and locks a parking pawl to a parking gear provided on the output shaft of a mission when stopping (parking), an electric parking lock device that uses an electric actuator to engage the parking pawl with a parking gear has been proposed. (For example, refer to Patent Document 1).

  In the electric parking lock device of Patent Document 1, when the selector switch (shift lever) is operated to P (parking), the parking pole is engaged with the parking gear by driving the motor, and when the P (parking) is released, the motor is locked. Is rotated in the opposite direction to the operation of P (parking), and the parking pole is separated from the parking gear.

Further, the electric parking lock device of Patent Document 1 deals with a case where the motor cannot be driven due to a voltage drop of a battery mounted on the vehicle body or a failure of an electric system of the motor in the P (parking) state. For this purpose, a manual unlocking means for releasing the parking pole from the parking gear by manual operation is provided. The manual unlocking means moves the connecting member biased by the compression coil spring together with the rod by pulling the manual unlocking lever, and by rotating the manual operation force transmission arm and the shift arm. Can be released from the parking gear and the locked state (engaged state) of both can be manually released.
Japanese Patent No. 3053384 (paragraph [0023], FIGS. 1 to 4)

  In the electric parking lock device of Patent Document 1, when the motor becomes inoperable, the engagement state between the parking pole and the parking gear can be manually released by the manual lock releasing means, but the motor is driven. When it became impossible, the parking lock which engages the parking pole with the parking gear could not be performed. Moreover, although the electric parking lock device of Patent Document 1 has a relatively simple configuration, in recent years, further simplification of the configuration and reduction of the number of parts have been desired for cost reduction and the like.

  Therefore, the present invention makes it possible to release the engagement state between the parking pawl and the parking gear and to engage the parking pawl with the parking gear even when the motor cannot be driven, and to further simplify the configuration. An object of the present invention is to provide an electric parking lock device that can reduce the number of parts and the number of parts.

  In order to achieve the above object, the present invention provides an electric drive source that generates a driving force for engaging and disengaging a parking pole with respect to a parking gear according to an output of a parking command means, and an output shaft of the electric drive source. A ball screw member loosely fitted in the formed screw groove and capable of converting the rotational motion of the output shaft by driving of the electric drive source into linear motion; and a linearly reciprocating rod shaft installed parallel to the output shaft; A linear motion transmission mechanism provided between the ball screw member and the rod shaft, and operable to engage or disengage the parking pole with respect to the parking gear according to a linear movement of the rod shaft. Parking pole actuating means, and the rotational movement of the output shaft by driving the electric drive source is converted into linear movement by the ball screw member, and the converted linear movement is converted into linear movement. An electric parking lock device that transmits to the rod shaft via a linear motion transmission mechanism and operates the parking pole actuating means by linear movement of the rod shaft. Manual operation means for moving is provided, and the manual operation means is operated to linearly move the rod shaft directly in one direction, whereby the parking pawl engaged with the parking gear is removed from the parking gear. The parking pole actuating means is actuated so as to be disengaged, and the parking pole disengaged from the parking gear is moved to the parking gear by linearly moving the rod shaft in a direction opposite to the one direction. The parking pole actuating means is actuated so as to be engaged.

  The electric parking lock device of the present invention operates a manual operation means with a simple configuration in which a rod shaft installed in parallel and an output shaft of an electric drive source are connected by a ball screw member via a linear motion transmission mechanism. Since the rod shaft can be directly linearly moved, the parking pole actuating means can be operated by linearly moving the rod shaft manually even when the electric drive source cannot be driven.

  According to the present invention, even when the electric drive source cannot be driven, the parking pole can be operated by operating the manual operation means to move the rod shaft directly in a straight line, thereby operating the parking pole. It can be released even when the gear is engaged (parking lock state), and can be engaged even when the parking pole is disengaged from the parking gear (parking lock released state).

  Further, according to the present invention, the manual operation means can be operated with a simple configuration in which the rod shaft installed in parallel and the output shaft of the electric drive source are connected by a ball screw member via a linear motion transmission mechanism. Since the rod shaft can be directly linearly moved, the apparatus configuration can be further simplified and the number of parts can be reduced.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a schematic configuration diagram showing an electric parking lock device according to an embodiment of the present invention.

<Configuration of electric parking lock device>
As shown in FIG. 1, an electric parking lock device 1 according to this embodiment includes a parking pole 5 that is detachably engaged with an electric actuator 2 and a parking gear 4 attached to an output shaft 3 of a mission (not shown). A parking pole actuating mechanism 6 that engages and disengages the pawl portion 5a of the parking pole 5 with respect to the tooth groove 4a of the parking gear 4, and a pawl portion 5a of the parking pole 5 with respect to the tooth groove 4a of the parking gear 4. And a detent mechanism 7 that generates a detent load according to engagement (when parking is locked) and disengagement (when parking lock is released).

  The electric actuator 2 includes an electric motor 9 as an electric drive source attached to the casing 8, an output shaft 9a of the electric motor 9 having a thread groove 9b on the peripheral surface, and a movement provided in parallel to the axial direction of the output shaft 9a. A rod shaft 10 having a free shaft 10, a ball screw member 11 installed around the thread groove 9 b of the output shaft 9 a, a concave portion 12 formed integrally on the upper surface side of the ball screw member 11, and a base end 13 a are connected to the rod shaft 10. And a connecting arm 13 disposed so that a lower projection (not shown) of the tip end portion 13b is positioned in the concave portion 12. In the present embodiment, the concave portion 12 and the connecting arm 13 constitute a linear motion transmission mechanism.

  The rotation (forward / reverse rotation) control and stop control of the electric motor 9 are performed by a signal from a transmission ECU (hereinafter referred to as ECU) 14 as a parking command means. A shift device 16 having a shift lever 15 is electrically connected to the ECU 14. By operating the shift lever 15, for example, P (parking), R (reverse), N (neutral), D (drive) Corresponding to the position, the mission (not shown) side can be switched to P, R, N, D. The shift device 16 is provided, for example, on the floor between the driver's seat and the passenger seat in the passenger compartment. The distal end side of the output shaft 9 a of the electric motor 9 is rotatably supported by a bearing portion 17 attached to the casing 8.

  The rod shaft 10 is movably inserted and supported by two rod shaft holding members 18a and 18b attached to both ends of the casing 8. A known push-pull cable 20 provided with a manual operation lever 19 at the tip is connected to the right tip (right side in FIG. 1) 10 a of the rod shaft 10. In the present embodiment, the manual operation lever 19 and the push-pull cable 20 constitute manual operation means. When the manual operation lever 19 is pulled or pushed, the inner cable (not shown) slides and the rod shaft 10 held by the rod holding members 18a and 18b moves within a predetermined range in the horizontal direction of FIG. It is configured to move linearly.

  The manual operation lever 19 is manually released (parking lock is released) at the time of parking lock (the state shown in FIG. 1) when the pawl portion 5a of the parking pole 5 is engaged with the tooth groove 4a of the parking gear 4. This is a lever for manually engaging (parking lock) when the parking lock is released (the state shown in FIG. 3) when the pawl portion 5a of the parking pole 5 is disengaged from the tooth groove 4a of the gear 4 and is provided in the vehicle interior. It has been. A parking pole operating arm 28 of a parking pole operating mechanism 6 to be described later is connected to a left end portion (left side in FIG. 1) 10b of the rod shaft 10 via a known push-pull cable 21.

  As shown in FIG. 2, the ball screw member 11 is loosely fitted on the outer periphery of a screw groove 9b formed on the surface of the output shaft 9a of the electric motor 9, and has a screw groove having the same pitch as the screw groove 9b of the output shaft 9a. A nut 22 having 22a, and a plurality of steel balls 23 rotatably disposed between the thread groove 9b of the output shaft 9a and the thread groove 22a of the nut 22 are provided. The plurality of steel balls 23 are substantially in contact with each other so as to be rotatable along a spiral track formed between the thread groove 9b of the output shaft 9a and the thread groove 22a of the nut 22, and when the output shaft 9a rotates, It circulates while rotating through a circulation path (not shown) formed in the above. Thereby, when the output shaft 9a rotates, the ball screw member 11 having the nut 22 linearly moves along the axial direction of the output shaft 9a. Further, the concave portion 12 is integrally formed on the upper surface of the nut 22.

  Further, in the present embodiment, the projecting lower portion (not shown) of the distal end portion 13b of the connecting arm 13 connected to the rod shaft 10 is positioned in the concave portion 12 formed on the upper surface side of the ball screw member 11 (nut 22). Therefore, for example, when the ball screw member 11 moves linearly in the right direction in FIG. 1 due to the positive rotation of the output shaft 9a driven by the electric motor 9, the projection lower portion (not shown) of the distal end portion 13b of the connecting arm 13 By being pressed against one wall surface 12a of the concave portion 12, the connected rod shaft 10 linearly moves in the right direction along with the linear movement of the connecting arm 13 in the right direction (the normal movement shown in FIG. 1). When parking lock. On the other hand, when the ball screw member 11 linearly moves in the left direction in FIG. 1 due to the reverse rotation of the output shaft 9 a driven by the electric motor 9, the projecting lower portion (not shown) of the distal end portion 13 b of the connecting arm 13 is the other of the concave portion 12. When the rod shaft 10 is pushed in contact with the wall surface 12b, the rod shaft 10 connected in accordance with the linear movement of the connecting arm 13 in the left direction moves linearly in the left direction (when the normal parking lock is released).

  When the electric motor 9 is not energized, the ball screw member 11 has a plurality of rotatable plural members arranged on a spiral track formed between the screw groove 9b of the output shaft 9a and the screw groove 22a of the nut 22. When the steel ball 23 is circulated through a circulation path (not shown), it can smoothly move linearly along the axial direction of the output shaft 9a while rotating the output shaft 9a.

  On the upper side of the parking pole 5, there are claw portions 5 a that can be engaged with a plurality of tooth grooves 4 a formed on the peripheral surface of the parking gear 4, and the lower side of the parking pole 5 is connected to the rotating shaft 24. It is supported rotatably. Further, an urging force that biases the parking pole 5 around the swing shaft 24 of the parking pole 5 in the right direction in FIG. A spring 25 is provided. One end side of the biasing spring 25 is locked in a locking hole 5b formed in the parking pole 5, and the other end side is locked by a spring locking member 26 which is a partial projection of the transmission case.

  The parking pole actuating mechanism 6 includes a parking pole actuating arm 28 which is rotatably provided on a rotating shaft 27 and is connected to the other end side of the push-pull cable 21, and a front end side opposite to the claw portion 5 a of the parking pole 5. The parking gear pressing arm 30 having a pressing roller 29 that can freely come into contact with the side surface 5c and the biasing spring 25. The parking pole operating arm 28 and the parking gear pressing arm 30 are provided with a rotating shaft 27. Rotate integrally around the center.

  In the detent mechanism 7, the base end side is swingably supported by the swing shaft 31, the roller arm 33 provided with the roller pin 32 on the tip end side of the intermediate portion, and the base end side is freely rotatable about the rotation shaft 27. The detent arm 34 is supported and the roller pin 32 is in contact with the peripheral surface of the distal end. The biasing spring 35 biases the distal end side (roller pin 32 side) of the roller arm 33 toward the rotating shaft 27 of the detent arm 34. Has been. One end side of the biasing spring 35 is locked to the tip of the roller arm 33 (the tip side from the position of the roller pin 32), and the other end is locked around the rotation shaft 27. Further, the detent arm 34 rotates integrally with the rotation of the parking pole operating arm 28 and the parking gear pressing arm 30 around the rotation shaft 27.

  A first engagement with which the roller pin 32 engages with the peripheral surface of the distal end of the detent arm 34 in response to the parking lock (see FIG. 1) when the claw portion 5a of the parking pole 5 is engaged with the tooth groove 4a of the parking gear 4. A mating recess 34a and a second engagement recess 34b with which the roller pin 32 engages when the parking lock is released (see FIG. 3) when the pawl 5a of the parking pole 5 is disengaged from the tooth groove 4a of the parking gear 4. A convex curved surface 34c is formed between the first engagement recess 34a and the second engagement recess 34b.

  Next, a normal parking lock operation by the electric parking lock device 1 and a parking lock release operation by manual operation will be described with reference to FIGS. FIG. 1 is a diagram showing a normal parking lock state, and FIG. 3 is a diagram showing a parking lock release state by manual operation.

<Normal parking lock operation>
As shown in FIG. 1, when the vehicle (not shown) is stopped (parked), the driver operates the operation lever 15 at the position P (parking) of the shift device 16 so that the parking lock signal is transmitted to the ECU 14. Is output. The ECU 14 outputs a drive signal to the electric motor 9 of the electric actuator 2 based on the input of the parking lock signal, and drives the electric motor 9 to rotate. When the operating lever 15 of the shift device 16 is operated to a position other than P, as shown in FIG. 3, the electric parking lock device 1 is in an inoperative state, and the pawl portion 5a of the parking pole 5 It is detached from the tooth groove 4a of the gear 4.

  When the output shaft 9 a rotates (forward rotation) by driving the electric motor 9, the ball is screwed between the thread groove 9 b of the output shaft 9 a and the thread groove 22 a of the nut 22 via a plurality of steel balls 23. The screw member 11 linearly moves from the left side of FIG. 1 to the right side along the axial direction of the output shaft 9a to a predetermined position (FIG. 1 shows the state where the ball screw member 11 has moved to the predetermined position). When the ball screw member 11 is linearly moved in the right direction, a projection lower portion (not shown) of the tip end portion 13b of the connecting arm 13 is pressed against one wall surface 12a of the concave portion 12, whereby the connecting arm 13 is also ball screwed. Along with the member 11, it moves linearly from the left side in FIG.

  Further, the linear movement of the connecting arm 13 causes the rod shaft 10 connected to the connecting arm 13 to linearly move from the left side to the right side in FIG. 1 to a predetermined position (FIG. 1 shows that the rod shaft 10 moves to a predetermined position). State). A limit switch (not shown) is provided around the rod shaft 10, and the limit switch is turned on when the rod shaft 10 linearly moves to a predetermined position shown in FIG. 1, and based on this ON signal. The drive of the electric motor 9 is stopped by a stop signal output from the ECU 14.

  By the linear movement of the rod shaft 10 in the right direction, the parking pole operating arm 28 rotates counterclockwise about the rotating shaft 27 via the push-pull cable 21, and is integrated with the parking pole operating arm 28. The parking gear pressing arm 30 and the detent arm 34 rotate counterclockwise about the rotation shaft 27 (FIG. 1 shows that the parking pole operating arm 28, the parking gear pressing arm 30, and the detent arm 34 rotate to a predetermined position. Moved state).

  As a result, the detent mechanism 7 is activated, and the biasing force of the biasing spring 35 causes the tip peripheral surface of the detent arm 34 (initially, the bottom of the second engaging recess 34b (see FIG. 3)) with a predetermined pressing force. The first engaging recess 34a is so arranged that the roller pin 32 in contact with the roller pin 32 is pulled by the biasing force of the biasing spring 35 from the second engagement recess 34b through the top of the convex curved surface 34c in a state of contacting the surface. Move to the bottom of the. By a series of operations of the detent mechanism 7, a predetermined detent load is generated when the roller pin 32 is in contact with the top of the convex curved surface 34 c from the second engagement concave portion 34 b of the detent arm 34.

  Then, in synchronization with the movement of the roller pin 32 to the first engagement recess 34a, the pressing roller 29 provided on the distal end side of the parking gear pressing arm 30 abuts against the side surface 5c of the parking pole 5 and pushes it in. As shown in FIG. 1, the pawl portion 5a of the parking pole 5 is engaged with the tooth groove 4a of the parking gear 4, and the parking lock state is established.

  In addition, by operating the operating lever 15 from the position P to N, for example, from the state of FIG. 1 to rotate the electric motor 9 in the reverse direction, the parking lock state can be released by the reverse operation to the parking lock operation described above. .

<Parking lock release operation by manual operation>
When the parking lever is released by operating the operation lever 15 of the shift device 16 to, for example, N (neutral) from the parking lock state shown in FIG. 1, the voltage drop of the battery mounted on the vehicle body or the electric actuator 2 When the electric motor 9 cannot be driven due to a failure of the electric system of the electric motor 9, the driver moves the manual operation lever 19 connected to the push-pull cable 20 from the neutral position to the near side (right side in FIG. 3). ), The parking lock state can be released by manual operation.

  That is, when the manual operation lever 19 is pulled, the rod shaft 10 linearly moves from the right side to the left side in FIG. 3 to a predetermined position via the push-pull cable 20 connected to the manual operation lever 19 ( FIG. 3 shows a state in which the rod shaft 10 has moved to a predetermined position). At this time, the ball screw member 11 is located between the screw groove 9b of the output shaft 9a and the screw groove 22a of the nut 22 when the electric motor 9 is not energized as described above. A plurality of freely rotatable steel balls 23 arranged on a spiral orbit formed in a circular manner are circulated through a circulation path (not shown), so that the output shaft 9a is rotated and smoothly along the axial direction of the output shaft 9a. Linear movement is possible. As a result, the projection lower portion (not shown) of the distal end portion 13b of the connecting arm 13 is pressed against one wall surface 12a of the concave portion 12, whereby the ball screw member 11 is linearly moved from the right side to the left side in FIG.

  Therefore, even when the electric motor 9 cannot be driven, the rod shaft 10 can be linearly moved from the right side to the left side in FIG.

  Then, by the linear movement of the rod shaft 10 in the left direction, the parking pole operating arm 28 rotates clockwise about the rotating shaft 27 via the push-pull cable 21 and is integrated with the parking pole operating arm 28. The parking gear holding arm 30 and the detent arm 34 rotate clockwise about the rotation shaft 27 (FIG. 3 shows that the parking pole operating arm 28, the parking gear holding arm 30, and the detent arm 34 are rotated to a predetermined position. Moved state).

  As a result, the detent mechanism 7 is activated, and the biasing force of the biasing spring 35 causes the tip peripheral surface of the detent arm 34 (initially, the bottom of the first engaging recess 34a (see FIG. 1)) with a predetermined pressing force. The second engaging recess 34b is configured such that the roller pin 32 that is in contact with the surface of the roller pin 32 is pulled by the biasing force of the biasing spring 35 through the top of the convex curved surface 34c from the first engaging recess 34a while being in contact with the surface. Move to the bottom of the. By a series of operations of the detent mechanism 7, a predetermined detent load is generated when the roller pin 32 is in contact with the top of the convex curved surface 34c from the first engagement concave portion 34a of the detent arm 34.

  Then, in synchronization with the movement of the roller pin 32 to the second engagement recess 34b, the pressing of the pressing roller 29 provided on the distal end side of the parking gear pressing arm 30 against the side surface 5c of the parking pole 5 is released, As shown in FIG. 3, the parking pole 5 swings to a predetermined position around the swinging shaft 24 by the biasing force of the biasing spring 25, and the pawl portion 5 a of the parking pole 5 moves to the tooth groove 4 a of the parking gear 4. The parking lock is released. A locking member (not shown) that locks the parking pole 5 in a state where the parking pole 5 is swung to a predetermined position is provided in the vicinity of the parking pole 5.

  As described above, when the parking lock state is released by manual operation due to the inability to drive the electric motor 9, the rod shaft 10 is manually straightened directly by the pulling operation of the manual operation lever 19 connected to the push-pull cable 20. It can be done easily by moving it.

  Moreover, according to the electric parking lock device 1 according to the above-described embodiment, the rotational motion of the output shaft 9a of the electric motor 9 is converted into linear motion by the ball screw member 11, and the converted linear motion is converted into the concave portion 12. In addition, the configuration of the electric actuator 2 can be simplified by the configuration of transmitting to the rod shaft 10 provided in parallel with the output shaft 9 a via the connecting arm 13. Therefore, the device configuration of the electric parking lock device 1 can be further simplified and the number of parts can be reduced.

  In the electric parking lock device 1 according to the above-described embodiment, the manual operation lever is used when the parking lock is released (see FIG. 3) when the pawl portion 5a of the parking pole 5 is detached from the tooth groove 4a of the parking gear 4. By pushing 19 from the neutral position to the front side (left side in FIG. 3), the rod shaft 10 is linearly moved directly from the left side to the right side in FIG. Thus, the parking pole operating mechanism 6 and the detent mechanism 7 can be operated. Thereby, even when the electric motor 9 cannot be driven, the pawl portion 5a of the parking pole 5 can be engaged with the tooth groove 4a of the parking gear 4 by manual operation to perform the parking lock.

The schematic structure figure showing the electric parking lock device concerning the embodiment of the present invention. The schematic sectional drawing which shows the ball screw member used for the electric parking lock apparatus which concerns on embodiment of this invention. The figure which shows the parking lock cancellation | release state by manual operation of the electric parking lock apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric parking lock device 2 Electric actuator 4 Parking gear 4a Tooth groove 5 Parking pole 5a Claw part 6 Parking pole operating mechanism (parking pole operating means)
7 Detent mechanism 9 Electric motor (electric drive source)
9a Output shaft 10 Rod shaft 11 Ball screw member 12 Concave part (linear motion transmission mechanism)
13 Connecting member (Linear motion transmission mechanism)
14 ECU (parking command means)
15 Shift lever 16 Shift device 19 Manual operation lever (manual operation means)
20 Push-pull cable (manual operation means)
21 Push-pull cable 25 Biasing spring 28 Parking pole actuating arm 30 Parking gear holding arm 34 Detent arm

Claims (1)

An electric drive source that generates a driving force for engaging / disengaging the parking pole with respect to the parking gear according to the output of the parking command means, and a screw groove formed on the output shaft of the electric drive source, A ball screw member capable of converting a rotational motion of the output shaft by driving of a drive source into a linear motion; a linearly movable rod shaft installed in parallel with the output shaft; and the ball screw member and the rod shaft. A linear motion transmission mechanism provided therebetween, and a parking pole actuating means operable to engage or disengage the parking pole with respect to the parking gear in accordance with a linear movement of the rod shaft. Rotational motion of the output shaft due to driving of the drive source is converted into linear motion by the ball screw member, and the converted linear motion is converted to the robot through the linear motion transmission mechanism. Is transmitted to the de-axis, an electric parking lock device for operating the parking pawl actuating means by linear movement of the rod axis,
Manual operation means for linearly moving the rod shaft directly in a reciprocating manner is provided,
The parking pole operation is performed so that the parking pole engaged with the parking gear is disengaged from the parking gear by operating the manual operation means and linearly moving the rod shaft in one direction. The parking pole is configured to engage the parking gear separated from the parking gear by moving the rod shaft directly in a direction opposite to the one direction. The actuating means is activated,
An electric parking lock device.

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