JP2016156385A - Parking lock device of transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alleviate an impact which is generated resulting from the residual torque of a rotating shaft of a transmission at the release of a parking lock.SOLUTION: When operating a parking lock, a second protrusion 17a is fit into a second tooth groove after fitting a first protrusion 16a into a first tooth groove 12a, and when releasing the parking lock, the second protrusion 17a is released from a second tooth groove 13a after releasing the first protrusion 16a from the first tooth groove 12a. In a state that the first protrusion 16a is fit into the first tooth groove 12a, and the second protrusion 17a is fit into the second tooth groove 13a, a gap between the second protrusion 17a and the second tooth groove 13b at both sides in a peripheral direction is larger than a gap between the first protrusion 16a and the first tooth groove 12a at both sides in the peripheral direction, and thereby, not only the parking lock can be operated without a delay but also an impact can be reduced by releasing a twist of a rotating shaft 11 in two steps at the release of the parking lock.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a parking lock device for a transmission that can alleviate an impact that occurs when a parking lock is released.

  When the shift range is switched from the drive range or reverse range to the parking range, in the parking lock device in which the parking pole engages with the parking gear and the rotation shaft is unrotatable, the hydraulic circuit Due to the delay in response, the transmission hydraulic clutch and hydraulic brake are not disengaged quickly, and the driving force of the engine is transmitted to the rotating shaft while the parking pole is engaged with the parking gear and the rotating shaft is restrained. The parking lock may operate with torque remaining on the shaft. If the parking lock is released in a state where such residual torque exists, there is a problem that the rotating shaft is suddenly rotated by releasing the residual torque, and the parking pole is ejected to generate noise.

  In order to solve this problem, a device described in Patent Document 1 includes a parking gear and a guide gear fixed to a rotating shaft, a parking pole meshable with the parking gear, and a guide pole meshable with the guide gear. The teeth of the parking gear and the teeth of the guide gear are out of phase with each other, and the projection meshing with the teeth of the guide gear is elastically supported by the guide pole via a spring. When the parking lock is activated, the protrusion of the guide pole elastically supported by the spring first engages with the guide gear while moving, and then the protrusion of the parking pole engages with the parking gear, thereby reducing the residual torque and rotating the rotating shaft. Therefore, when the parking lock is released, the amount of rotation of the rotary shaft due to the residual torque is reduced and the impact is reduced.

Japanese Unexamined Patent Publication No. 2000-291997

  By the way, when the parking lock is activated after the vehicle stops on a slope or when the parking lock is activated before the vehicle is completely stopped, the vehicle moves and continues to the driving wheel after the parking lock is activated. Since torque is accumulated in the drive system, it is inevitable that a large residual torque is generated on the rotating shaft in the conventional parking lock device, and a large impact may occur when the parking lock is released from this state. there were.

  In addition, in the conventional parking lock device, since the projection that first meshes with the guide gear is elastically supported by the spring, the behavior of the projection may become unstable and smooth meshing with the guide gear may be hindered. .

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to alleviate an impact caused by a residual torque of a transmission rotating shaft when a parking lock is released.

  In order to achieve the above object, according to the first aspect of the present invention, a first parking gear fixed to a transmission rotating shaft and having a plurality of first tooth grooves formed at a predetermined interval on an outer periphery thereof; A second parking gear fixed to the rotating shaft and having a plurality of second tooth grooves formed at a predetermined interval on the outer periphery, and a first protrusion that can be fitted into the first tooth groove of the first parking gear are formed. A first parking pole; a second parking pole formed with a second protrusion that can be fitted into the second tooth groove of the second parking gear; and driving the first parking pole to A parking pawl drive mechanism that engages and disengages the first tooth groove and drives the second parking pawl to engage and disengage the second protrusion to and from the second tooth groove, and the parking pawl drive mechanism includes a parking lock. Product When the first protrusion is fitted into the first tooth groove, the second protrusion is fitted into the second tooth groove, and when the parking lock is released, the first protrusion is detached from the first tooth groove. After the second protrusion is detached from the second tooth groove, the first protrusion is fitted into the first tooth groove, and the second protrusion is fitted into the second tooth groove. A parking lock for a transmission, characterized in that a gap between the two protrusions on both sides in the circumferential direction is larger than a gap between the first protrusions on both sides in the circumferential direction. A device is proposed.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the parking pole driving mechanism includes a first cone member that is driven in contact with the first parking pole, and the second parking pole. A second cone member that is driven in contact with a pole; and a coupling member that couples the first cone member and the second cone member to move together, and when the parking lock is operated, the second cone member A parking lock device for a transmission is proposed in which a moving distance until the first cone member contacts the first parking pole is longer than a moving distance until the first cone member contacts the first parking pole. .

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the parking pole drive mechanism temporarily separates the second cone member from the connecting member when releasing the parking lock. A parking lock device for a transmission is provided that includes a lost motion mechanism.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the parking pawl drive mechanism moves from the first parking pawl side to the second parking pawl side when operating a parking lock. A transmission parking lock device is provided, comprising a cone member that moves, contacts the first parking pawl and drives to the operating position, and then contacts the second parking pawl and drives to the operating position. .

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the parking pawl drive mechanism includes a lock mechanism that locks the second parking pawl in an operating position, and when the parking lock is released. A parking lock device for a transmission is proposed in which the cone member includes unlocking means for unlocking the lock mechanism after the first parking pole is returned to the release position.

  According to the invention described in claim 6, in addition to the configuration of any one of claims 1 to 5, the damper for buffering the movement of the second parking pole from the operating position to the release position is provided. There is proposed a parking lock device for a transmission characterized by comprising the following.

  According to the invention described in claim 7, in addition to the configuration of any one of claims 1 to 6, the second parking gear is divided into an inner peripheral portion and an outer peripheral portion, and the inner peripheral portion is divided. A parking lock device for a transmission is proposed in which the outer peripheral portion and the outer peripheral portion are connected by an annular elastic member.

  The stopper 44 in the embodiment corresponds to the unlocking means of the present invention.

  According to the configuration of the first aspect, the parking lock device of the transmission is fixed to the rotary shaft, and the first parking gear fixed to the rotary shaft of the transmission and having a plurality of first tooth grooves formed on the outer periphery at predetermined intervals. A second parking gear having a plurality of second tooth grooves formed on the outer periphery at predetermined intervals, a first parking pole having first protrusions that can be fitted into the first tooth grooves of the first parking gear, A second parking pole formed with a second protrusion that can be fitted in the second tooth groove of the two parking gear; and the second parking pole that drives the first parking pole to engage and disengage the first protrusion from the first tooth groove. A parking pole drive mechanism for driving the pole to engage and disengage the second protrusion with the second tooth groove;

  When the parking lock is activated, the first protrusion is fitted into the first tooth groove and then the second protrusion is fitted into the second tooth groove. When the parking lock is released, the first protrusion is detached from the first tooth groove. The second protrusion is detached from the second tooth gap, the second protrusion is fitted to the first tooth groove, and the second protrusion is fitted to the second tooth groove. Since the gap between the tooth gaps is larger than the gap between the first protrusions on both sides in the circumferential direction of the first protrusion, the parking lock can be operated without delay by the first parking pole and the first parking gear. In addition, when the first protrusion of the first parking pole is detached from the first tooth groove of the first parking gear and the rotating shaft is rotated to the original state by the residual torque, the second protrusion of the second parking pole is 2 Touch the end of the second tooth gap of the parking gear. The residual torque is partially released by rotating the rotating shaft until the second shaft is rotated, and then the second protrusion of the second parking pole is detached from the second tooth groove of the second parking gear to completely release the residual torque. Thus, it is possible to reduce the impact associated with releasing the parking lock.

  In addition, the first protrusion of the first parking pawl that first fits into the first tooth groove of the first parking gear when the parking lock is operated does not need to be elastically supported with respect to the first parking pawl. The first protrusion of the first parking pole can be smoothly fitted into the first tooth groove of the first parking gear, and the parking lock can be operated reliably.

  According to the second aspect of the present invention, the parking pole drive mechanism includes a first cone member that is driven by contact with the first parking pole, a second cone member that is driven by contact with the second parking pole, and the first A connecting member that connects and moves the cone member and the second cone member integrally, and when the parking lock is operated, the moving distance until the second cone member contacts the second parking pole is the first cone member Is longer than the moving distance until the first parking pole comes into contact with the first parking pole, the first parking pole can be moved to the operating position first, and then the second parking pole can be moved to the operating position.

  According to the third aspect of the present invention, the parking pole drive mechanism includes the lost motion mechanism that temporarily separates the second cone member from the connecting member when the parking lock is released. The first parking pole is first moved to the release position while the second parking pole is held in the operating position by temporarily separating the member from the connecting member, and the first parking pole is returned to the release position and then 2 The parking lock can be moved to the release position with a delay.

  According to the fourth aspect of the present invention, when the parking lock is operated, the parking pole drive mechanism moves from the first parking pole side to the second parking pole side, contacts the first parking pole, and drives to the operating position. Then, since the cone member that contacts the second parking pole and drives to the operating position is provided, the first parking pole can be moved to the operating position first, and then the second parking pole can be moved to the operating position.

  According to the fifth aspect of the present invention, the parking pawl drive mechanism includes a lock mechanism that locks the second parking pawl in the operating position, and when the parking lock is released, the cone member returns the first parking pawl to the release position. Since the release mechanism for unlocking the lock mechanism later is provided, the first parking pole is first moved to the release position while the second parking pole is locked to the operating position by the lock mechanism, and the first parking pole is released. After returning to the position, the lock mechanism is unlocked by the unlocking means, and the second parking lock can be moved to the released position with a delay.

  According to the sixth aspect of the present invention, the damper is provided for buffering the movement of the second parking pole from the operating position to the release position, so that the second parking pole moves from the operating position to the release position as the parking lock is released. This is delayed by the damper, and the time difference between the movement timings of the first parking pole and the second parking pole to the release position can be generated more reliably.

  According to the seventh aspect of the present invention, the second parking gear is divided into the inner peripheral portion and the outer peripheral portion, and the inner peripheral portion and the outer peripheral portion are connected by the annular elastic member. When the second protrusion of the second parking pole collides with the end portion of the second tooth groove of the gear, the elastic member is elastically deformed, whereby the impact can be more effectively mitigated.

The side view of a parking lock apparatus. (First embodiment) 2A-2A line and 2B-2B line sectional drawing of FIG. (First embodiment) FIG. 4 is a detailed view of driven parts of the first and second cone members and the first and second parking poles. (First embodiment) Action | operation explanatory drawing at the time of the action | operation of a parking lock. (First embodiment) Action | operation explanatory drawing at the time of cancellation | release of a parking lock. (First embodiment) The side view of a parking lock apparatus. (Second Embodiment) FIG. 7 is a cross-sectional view taken along line 7A-7A in FIG. (Second Embodiment) FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. (Second Embodiment) Action | operation explanatory drawing at the time of the action | operation of a parking lock. (Second Embodiment) Action | operation explanatory drawing at the time of cancellation | release of a parking lock. (Second Embodiment) The side view of the 2nd parking gear. (Third embodiment)

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, a parking lock device provided in a transmission for an automobile includes a first parking gear 12 and a second parking gear 13 that are fixed to a rotation shaft 11 of the transmission. In the present embodiment, the first parking gear 12 and the second parking gear 13 are disposed so as to be adjacent to each other in the axial direction, and for example, seven first tooth grooves 12a. .. Are formed at regular intervals, and, for example, seven second tooth grooves 13 a... Are formed at regular intervals on the outer periphery of the second parking gear 13. The phases of the first tooth grooves 12a and the second tooth grooves 13a are the same, but the groove widths in the circumferential direction of the second tooth grooves 13a are different from the groove widths in the circumferential direction of the first tooth grooves 12a. Is set larger.

  An intermediate portion of the first parking pole 16 bent in a “h” shape and an intermediate portion of the second parking pole 17 having a substantially straight shape are pivotally supported on a support shaft 15 fixed to the transmission case 14. The The first protrusion 16 a formed at the tip of the first parking pole 16 can be engaged with one of the first tooth grooves 12 a of the first parking gear 12, and the first protrusion 16 a formed at the tip of the second parking pole 17. The two protrusions 17a can be engaged with one of the second tooth grooves 13a of the second parking gear 13. The first protrusion 16a and the second protrusion 16a have the same size, and the first protrusion 16a is fitted into the first tooth grooves 12a of the first parking gear 12 through a slight circumferential gap. The protrusions 17a are fitted into the second tooth grooves 13a of the second parking gear 13 through a large circumferential gap (see FIG. 1).

  A first parking rod 18 and a second parking rod 19 that are arranged in parallel to each other are slidably supported on the mission case 14, and the first parking rod 18 is connected to an actuator 20 and driven to reciprocate. The second parking rod 19 reciprocates in conjunction with the reciprocating motion of the first parking rod 18. The first and second parking rods 18 and 19 are provided with a parking pole driving mechanism 21 for driving the first and second parking poles 16 and 17.

  The parking pole drive mechanism 21 includes a stopper 37 fixed to the first parking rod 18, a first cone member 22 slidably supported by the first parking rod 18, and one end of the first parking rod. One end (on the right side in FIG. 2A) abuts on the plate-like connecting member 23 slidably supported by the spring 18 and the spring seat 24 fixed to the first parking rod 18, and the other end (FIG. The left side in A) includes a coil spring 25 that abuts against the connecting member 23. Accordingly, the coupling member 23 and the first cone member 22 are urged to the left side by the elastic force of the coil spring 25 and stop at a position where the first cone member 22 contacts the stopper 37.

  The first cone member 22 is disposed between the first driven portion 16b at the base end of the first parking pole 16 and the first holder 26 fixed to the transmission case 14, and the first driven portion 16b is moved forward. Is pressed to swing the first parking pole 16 to the operating position. A first return spring 27 for swinging the first parking pole 16 to the release position is disposed on the outer periphery of the support shaft 15 (see FIG. 1).

  The parking pole drive mechanism 21 includes a second cone member 28 that is slidably fitted to the second parking rod 19 and the plate-like shape through which the second parking rod 19 penetrates the other end. The other end (left side in FIG. 2A) is locked to the connecting member 23 and the spring seat 29 provided on the second parking rod 19, and one end (right side in FIG. And a first coil spring 30 made of a compression coil spring pressed against the connecting member 23.

  Further, the parking pole drive mechanism 21 includes a spring seat 31 that is fixed to the second parking rod 19 and sandwiches the connecting member 23 with the second cone member 28, and a stopper 32 that is fixed to the second parking rod 19. And a second coil spring 33 composed of a tension coil spring fixed to the spring seat 31 and the transmission case 14 at both ends. When the parking lock is released, a predetermined gap α (see FIG. 2A) is formed between the mission case 14 and the stopper 32.

  The second cone member 28 is disposed between the second driven portion 17b at the base end of the second parking pole 17 and the second holder 34 fixed to the transmission case 14, and the second driven portion 17b is moved forward. Is pressed to swing the second parking pole 17 to the operating position. A second return spring 35 for swinging the second parking pole 17 to the release position is disposed on the outer periphery of the support shaft 15 (see FIG. 1).

  The first parking pole 16 and the second parking pole 17 are actually juxtaposed in the axial direction of the rotating shaft 11, but in FIG. 2A, the first parking pole 16 and the second parking pole are shown for convenience. 17 is described in an aligned state in the axial direction (left-right direction in the figure).

  As shown in detail in FIG. 3A, the inclination angles of the cam surface 22a of the first cone member 22, the cam surface 28a of the second cone member 28, and the locking surface 28b of the second cone member 28 are all the same θ. The apex of the cam surface 22a of the first cone member 22 is offset by a distance β to the left in the axial direction with respect to the apexes of the cam surface 28a and the locking surface 28b of the second cone member 28.

  The inclination angles of the cam surface 16c of the first parking pole 16, the cam surface 17c of the second parking pole 17, and the locking surface 17d of the second parking pole 17 are all the same φ. θ is set to be larger than φ, so that the cam surface 22a of the first cone member 22 can stably come into contact with the cam surface 16c of the first parking pole 16 at the apex thereof. The cam surface 28a of the member 28 can stably come into contact with the cam surface 17c of the second parking pole 17 at its apex, and the locking surface 28b of the second cone member 28 can be in contact with the second parking pole 17 at its apex. It is possible to stably contact the locking surface 17d.

  As shown in FIG. 2A, the locking surface 17d of the second parking pole 17, the locking surface 28b of the second cone member 28, and the first coil spring 30 constitute a lost motion mechanism 36 of the present invention.

  Next, the operation of the first embodiment of the present invention having the above configuration will be described.

  FIG. 4 shows the operation when the parking lock is operated. In the parking lock release state shown in FIG. 4A, the cam surface 22a of the first cone member 22 is the first driven portion of the first parking pole 16. The cam surface 28 a of the second cone member 28 is separated from the cam surface 17 c of the second driven portion 17 b of the second parking pole 17.

  When the first parking rod 18 is driven to the left in the figure by the actuator 20 from this state, as shown in FIGS. 4B, 4C, and 4D, the first cone moves integrally with the first parking rod 18. When the cam surface 22a of the member 22 presses the cam surface 16c of the first parking pole 16, the first parking pole 16 swings around the support shaft 15 to the operating position, and the first protrusion 16a becomes the first parking gear. It fits into one of the 12 first tooth grooves 12a, and the rotation shaft 11 is restrained so as not to rotate, and the parking lock is activated.

  When the first parking pole 16 swings to the operating position, the first protrusion 16a may not fit into the first tooth groove 12a depending on the phase of the first parking gear 12, but in that case Only the first parking rod 18 moves to the left while compressing the coil spring 25, leaving the first cone member 22 and the connecting member 23, and the first cone member 22 and the connecting member 23 are in a standby state to stop moving. . When the first parking gear 12 rotates slightly and the phases of the first protrusion 16a and the first tooth groove 12a coincide with each other, the elastic force of the coil spring 25 moves the first cone member 22 and the connecting member 23 to the left side. Thus, the first parking pole 16 is swung, and the first protrusion 16a can be fitted into the first tooth groove 12a. The first cone member 22 and the connecting member 23 slide with respect to the first parking rod 18 only in the above-described case. In other cases, the first cone member 22 and the connecting member 23 are the first parking rod. 18 and move together.

  When the first parking rod 18 moves to the left as described above, the connecting member 23 that moves together with the first parking rod 18 presses the second cone member 28 to the left. At this time, the apex of the cam surface 28a of the second cone member 28 is located on the right side by a distance β from the apex of the cam surface 22a of the first cone member 22 (see FIG. 3A), so the first cone member 22 After the apex of the cam surface 22a of the first parking pole 16 abuts the cam surface 16c of the first parking pole 16, the apex of the cam surface 28a of the second cone member 28 reaches the cam surface 17c of the second parking pole 17 at a predetermined time. Abut (see FIG. 4B).

  Thus, in the process in which the second cone member 28 is moved to the left side by being pressed by the connecting member 23, the first coil spring 30 presses the spring seat 29, so that the second parking rod 19 is against the transmission case 14. Accordingly, the second parking rod 19 stops moving to the left at a position where the stopper 32 comes into contact with the transmission case 14 (see FIG. 4B). As the second parking rod 19 moves to the left, the second coil spring 33 having both ends fixed to the spring seat 31 and the transmission case 14 is extended by a distance α.

  Thereafter, the second cone member 28 pressed by the connecting member 23 moves further to the left while pushing up the second parking pole 17 and compressing the first coil spring 30, so that the second parking pole 17 is supported on the support shaft. The second protrusion 17a is fitted into one of the second tooth grooves 13a of the second parking gear 13 by swinging around 15 to the operating position (see FIG. 4C).

  Finally, the apex of the cam surface 28a of the second cone member 28 climbs over the cam surface 17a of the second parking pole 17 to the left, and the apex of the locking surface 28b of the second cone member 28 is the second parking pole 17 The second parking pole 17 is locked in the operating position by engaging with the locking surface 17d and pressing the locking surfaces 17d, 28b against each other by the elastic force of the compressed first coil spring 30 ( (See FIG. 4D). At this time, the first coil spring 30 is compressed to the limit position.

  As described above, when the parking lock is activated, the first protrusion 16a of the first parking pole 16 first swung by the first cone member 22 is one of the first tooth grooves 12a of the first parking gear 12. , And then the second protrusion 17a of the second parking pole 17 that is swung by the second cone member 28 is fitted into one of the second tooth grooves 13a of the second parking gear 13.

  Since the clearance in the circumferential direction between the first protrusion 16a of the first parking pole 16 to be fitted first and the first tooth groove 12a of the first parking gear 12 is set small, when the actuator 20 is driven, the rotation axis is not delayed. The parking lock can be operated by restricting the rotation of the motor 11. Since the phases of the first parking gear 12 and the second parking gear 13 are fixed by the fitting of the first protrusion 16a and the first tooth groove 12a, when the second parking pole 17 swings later, The second protrusion 17a of the two parking pole 17 can be smoothly fitted into one of the second tooth grooves 13a of the second parking gear 13.

  FIG. 5 shows the operation when the parking lock is released. As shown in FIG. 5A, when the first parking rod 18 is moved to the right by the actuator 20 from the parking lock operating state, the first parking rod is shown. As a result, the first cone member 22 moves to the right as a result of the elastic force of the first return spring 27 and the first parking pole 16 swings to the release position. As a result, the first protrusion 16a is detached from the first tooth groove 12a of the first parking gear 12, and the restraint of the first parking gear 12 is released (see FIGS. 5B, 5C, and 5D). .

  Even if the connecting member 23 moves to the right side together with the first parking rod 18 moving to the right side, the second cone member 28 is locked by being engaged with the second parking pole 17, so that the connecting member 23 is the second cone. The lost motion action of leaving the member 28 and moving to the right is exerted (see FIG. 5B). When the connecting member 23 that moves to the right contacts the spring seat 31 of the second parking rod 19, the second parking rod 19 moves to the right together with the connecting member 23.

  At this time, since the first coil spring 30 is compressed to the limit position, the second cone spring 28 is pressed and stretched to the right by the load of the second parking rod 19 moving to the right. Since the second parking rod 19 is urged to the right side by the elastic force to be contracted, the apex of the locking surface 28b of the second cone member 28 climbs over the locking surface 17d of the second parking pole 17, 2 The parking pole 17 is unlocked (see FIG. 5C).

  As a result, the second cone member 28 moves to the right on the second parking rod 19 by the elastic force of the compressed first coil spring 30 to extend to a position where the transmission case 14 is sandwiched between the spring seat 31. By stopping and returning to the initial state, the second parking pole 17 swings to the release position and the second protrusion 17a is detached from the second tooth groove 13a of the second parking gear 13 (FIG. 5D). reference).

  As described above, when releasing the parking lock, first the first protrusion 16a of the first parking pole 16 swinging by the first cone member 22 is detached from the first tooth groove 12a of the first parking gear 12, Next, the second protrusion 17 a of the second parking pole 17 that is swung by the second cone member 28 is detached from the second tooth groove 13 a of the second parking gear 13.

  For example, when the parking lock is activated in a state where the vehicle is stopped on a slope, the power transmission member between the drive wheel and the rotary shaft 11 is elastically deformed by a load that the vehicle tends to slide down the slope due to gravity, and the rotary shaft 11 Torque may accumulate in Alternatively, when the parking lock is activated while the vehicle is traveling at a low speed, the power transmission member between the driving wheel and the rotating shaft 11 is elastically deformed by the load transmitted from the driving wheel, and torque may be accumulated on the rotating shaft 11. is there. If the parking lock is released in such a state, the rotating shaft 11 may be rotated at a stroke by the torque, and the parking pole may be ejected from the tooth gap of the parking gear, causing an impact.

  However, according to the present embodiment, as shown in FIG. 5B, when the parking lock is released, the first protrusion 16a of the first parking pole 16 is first detached from the first tooth groove 12a of the first parking gear 12. Then, the second parking gear 13 rotates together with the rotating shaft 11 with the accumulated torque, but the second protrusion 17a of the second parking pole 17 is still fitted in the second tooth groove 13a of the second parking gear 13. In addition, since there is a gap between the second protrusion 17a and the circumferential end of the second tooth groove 13a, the gap is clogged and the second protrusion 17a is at the circumferential end of the second tooth groove 13a. By rotating the second parking gear 13 and the rotating shaft 11 until they are engaged, a part of the accumulated torque is released.

  Subsequently, when the second protrusion 17a of the second parking pole 17 is disengaged from the second tooth groove 13a of the second parking gear 13 from the state of FIG. 5 (C), as shown in FIG. 11 further rotates and the remaining torque is released. Thus, by rotating the rotating shaft 11 in two stages, it is possible to avoid a situation in which the torque accumulated in the power transmission member between the driving wheel and the rotating shaft 11 is released all at once, and the impact associated with the release of the parking lock. Can be effectively mitigated.

  The direction in which the rotating shaft 11 rotates when the parking lock is released, that is, the direction of the residual torque, is whether the vehicle has stopped on the uphill or the downhill, or has the parking lock been activated during forward travel? Although it differs depending on whether it has been operated during reverse travel, the gap between the second protrusion 17a of the second parking pole 17 and the second tooth groove 13a of the second parking gear 13 is set on both sides in the circumferential direction. The impact mitigating effect is demonstrated regardless of the direction.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIGS. Note that parts having the same structure as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  Although the first embodiment includes two parking rods, a first parking rod 18 and a second parking rod 19, the second embodiment is an actuator 20 as shown in FIGS. Only one parking rod 40 to be driven is provided. A single cone member 41 is slidably supported on the parking rod 40, and the cone member 41 is a coil disposed between one end side (right side in FIG. 7) of the parking rod 40. The spring 43 is urged to a position in contact with a stopper 44 provided on the other end side (left side in FIG. 7) of the parking rod 40. The function of the coil spring 43 is the same as that of the coil spring 25 (see FIG. 2A) of the first embodiment, and the first protrusion 16a of the first parking pole 16 and the first The phase shift with the first tooth grooves 12a of the one parking gear 12 is compensated, and the parking lock can be smoothly operated.

  The cam surface 41 a of the cone member 41 can contact the first driven portion 16 b of the first parking pole 16 and the second driven portion 17 b of the second parking pole 17 that are juxtaposed in the axial direction. The tip of the second parking pole 17 is provided with an extension portion 17e extending beyond the second protrusion 17a, and the second parking pole 17 in the disengagement direction between the transmission case 14 and the extension portion 17e. A damper 45 that suppresses the moving speed is disposed.

  As shown in FIGS. 7 and 8, the second parking pole 17 is placed between the second driven portion 17 b of the second parking pole 17 and the small diameter portion 41 b that is continuous with the cam surface 41 a of the cone member 41. A locking mechanism 46 is provided for locking.

  The lock mechanism 46 is fitted into the small-diameter portion 41b of the cone member 41 so that the inner periphery is slidable in the axial direction, and the outer periphery is formed in an arc-shaped recess 17f formed in the second driven portion 17b of the second parking pole 17. A cup-shaped outer member 47 that is slidably fitted in the radial direction and a small-diameter portion 41 b of the cone member 41 are fitted so that the inner circumference is slidable in the axial direction, and the outer circumference is axially directed to the inner circumference of the outer member 47. A disc-shaped inner member 48 that is slidably fitted, and a coil spring 49 that is disposed between the outer member 47 and the inner member 48 and biases the inner member 48 to the left side with respect to the outer member 47.

  When the second parking pole 17 is in the release position, the inner member 48 is fitted into the recess 17f of the second parking pole 17 in a state of being fitted inside the outer member 47 (see FIG. 7A). An arc-shaped stepped portion 17g is formed on the radially inner side of the concave portion 17f of the second parking pole 17, and when the second parking pole 17 is in the operating position, the inner member 48 is caused by the elastic force of the coil spring 49. The second parking pole 17 is pushed out of the outer member 47 and engaged with the stepped portion 17g of the second parking pole 17 to lock the second parking pole 17 in the operating position (see FIG. 7B).

  Next, the operation of the second embodiment of the present invention having the above configuration will be described.

  FIG. 9 shows the operation when the parking lock is operated. As shown in FIG. 9A, when the parking rod 40 moves to the left in the figure from the parking lock released state, it moves integrally with the parking rod 40. The cam surface 41a of the cone member 41 first comes into contact with the cam surface 16c of the first parking pole 16 located on the right side. As shown in FIG. 9B, when the parking rod 40 moves further to the left, the first driven portion 16b of the first parking pole 16 is pushed up by the cone member 41 and swings to the operating position. The protrusion 16a is fitted into one of the first tooth grooves 12a of the first parking gear 12, and the parking lock is activated.

  As shown in FIG. 9C, when the parking rod 40 moves further to the left, the cam surface 41a of the cone member 41 pushes up the cam surface 17c of the second parking pole 17, and the second parking pole 17 moves to the operating position. The second protrusion 17a is engaged with one of the second tooth grooves 13a of the second parking gear 13. When the second parking pole 17 swings to the operating position, the damper 45 extends so as to follow the movement of the extension 17 e of the second parking pole 17.

  Further, when the stepped portion 17g of the recessed portion 17f of the swinging second parking pole 17 passes the outer periphery of the inner member 48 of the lock mechanism 46 radially outward, the inner member 48 is released from the outer member 47 by the resilient force of the coil spring 49. The second parking pole 17 is locked in the operating position by being pushed to the left and the inner member 48 engaging with the stepped portion 17g.

  As described above, according to the present embodiment, the first protrusion 16a of the first parking pole 16 is fitted into one of the first tooth grooves 12a of the first parking gear 12, and then the first parking gear 12 is delayed for a predetermined time. The second protrusion 17a of the second parking pole 17 can be fitted into one of the second tooth grooves 13a of the second parking gear 13.

  FIG. 10 shows the action when the parking lock is released. When the first parking rod 18 is moved to the right side by the actuator 20 from the parking lock operating state, it is shown in FIGS. 10 (A) to 10 (C). Thus, even if the cam surface 41a of the cone member 41 is separated from the cam surface 17c of the second parking pole 17, the second parking pole 17 is locked in the operating position by the lock mechanism 46. The second protrusion 17 a is held in a state of being fitted into the second tooth groove 13 a of the second parking gear 13.

  In the meantime, as shown in FIG. 10C, the cam surface 41a of the cone member 41 is separated from the cam surface 16c of the first parking pole 16, so that the parking rod 40 swings to the release position and moves to the first position. The protrusion 16a is disengaged from the first tooth groove 12a of the first parking gear 12, and the restraint of the first parking gear 12 is released.

  When the parking rod 40 moves further to the right side, as shown in FIG. 10D, the stopper 44 as the unlocking means provided at the left end of the parking rod 40 contacts the inner member 48 of the lock mechanism 46 and moves to the right side. By pressing, the inner member 48 is fitted into the outer member 47 and the engagement with the stepped portion 17g of the second parking pole 17 is released, so that the second parking pole is caused by the elastic force of the second return spring 35. 17 swings to the release position, and the second protrusion 17 a of the second parking pole 17 is disengaged from the second tooth groove 13 a of the second parking gear 13.

  As described above, also in the present embodiment, when releasing the parking lock, first, the first protrusion 16a of the first parking pole 16 is detached from the first tooth groove 12a of the first parking gear 12 (FIG. 10). (See (C)), and then the second protrusion 17a of the second parking pole 17 is disengaged from the second tooth groove 13a of the second parking gear 13 (see FIG. 10D), so that the rotary shaft 11 is divided into two stages. Thus, it is possible to avoid a situation in which the torque accumulated in the power transmission member between the driving wheel and the rotating shaft 11 is released at once, and to mitigate the impact associated with the release of the parking lock.

  Moreover, in FIG. 10D, when the second parking pole 17 swings to the release position, the extension 17e of the second parking pole 17 compresses the damper 45, so that the second parking pole 17 swings. Speed is reduced. As a result, after the first protrusion 16 a of the first parking pole 16 is disengaged from the first tooth groove 12 a of the first parking gear 12, the second protrusion 17 a of the second parking pole 17 is the second of the second parking gear 13. A time difference until the tooth is removed from the tooth gap 13a can be ensured more reliably.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIG.

  The third embodiment is characterized by the second parking gear 13, and an annular elastic member 13d such as rubber is sandwiched between the inner peripheral portion 13b and the outer peripheral portion 13c of the second parking gear 13. is there.

  According to the present embodiment, the first protrusion 16 a of the first parking pole 16 is disengaged from the first tooth groove 12 a of the first parking gear 12, and the second protrusion 17 a of the second parking pole 17 is the second parking gear 13. When it collides with the end of the second tooth groove 13a, the impact of the collision can be reduced by the elastic member 13d of the second parking gear 13, and the noise can be further reduced.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the first parking gear 12 and the second parking gear 13 are configured as separate members, but they may be integrated into a single member.

  In the embodiment, the circumferential width of the second tooth groove 13a is set larger than the circumferential width of the first tooth groove 12a. However, the circumferential width of the second tooth groove 13a is set to the circumference of the first tooth groove 12a. Alternatively, the circumferential width of the second tooth groove 13a may be set smaller than the circumferential width of the first tooth groove 12a. In this case, by setting the circumferential width of the second protrusion 17a to be smaller than the circumferential width of the first protrusion 16a, the first protrusion 16a fits into the first tooth groove 12a and the second protrusion 17a becomes the second. The gap between the second teeth 17a on both sides in the circumferential direction of the second protrusion 17a and the gap between the first teeth 12a on both sides in the circumferential direction of the first protrusion 16a in a state of being fitted in the tooth grooves 13a. It is necessary to set a larger value.

  In the embodiment, the number of teeth of the first parking gear 12 and the number of teeth of the second parking gear 13 are the same. However, by thinning out the teeth of the second parking gear 13, The number of tooth grooves 13a may be smaller than the number of first tooth grooves 12a of the first parking gear 12.

  Further, the damper 45 of the second parking pole 17 of the second embodiment can be applied to the second parking pole 17 of the first embodiment.

11 Rotating shaft 12 First parking gear 12a First tooth groove 13 Second parking gear 13a Second tooth groove 13b Inner peripheral portion 13c Outer peripheral portion 13d Elastic member 16 First parking pole 16a First protrusion 17 Second parking pole 17a Second Projection 21 Parking pole drive mechanism 22 First cone member 23 Connecting member 28 Second cone member 36 Lost motion mechanism 41 Cone member 44 Stopper (lock release means)
45 Damper 46 Lock mechanism

Claims (7)

A first parking gear (12) which is fixed to the rotation shaft (11) of the transmission and has a plurality of first tooth grooves (12a) formed at predetermined intervals on the outer periphery;
A second parking gear (13) fixed to the rotating shaft (11) and having a plurality of second tooth grooves (13a) formed on the outer periphery at predetermined intervals;
A first parking pole (16) having a first protrusion (16a) that can be fitted into the first tooth groove (12a) of the first parking gear (12);
A second parking pole (17) formed with a second protrusion (17a) that can be fitted into the second tooth groove (13a) of the second parking gear (13);
The first parking pole (16) is driven to disengage the first protrusion (16a) from the first tooth groove (12a) and the second parking pole (17) is driven to move the second protrusion ( A parking pole drive mechanism (21) for engaging and disengaging 17a) with the second tooth groove (13a);
The parking pole drive mechanism (21) engages the first protrusion (16a) with the first tooth groove (12a) and then moves the second protrusion (17a) into the second tooth groove when the parking lock is operated. (13a), when the parking lock is released, the first protrusion (16a) is detached from the first tooth groove (12a), and then the second protrusion (17a) is moved to the second tooth groove (13a). Withdraw from
With the first protrusion (16a) fitted into the first tooth groove (12a) and the second protrusion (17a) fitted into the second tooth groove (13a), the second protrusion (17a) ) Between the second tooth grooves (13a) on both sides in the circumferential direction is larger than the gap between the first tooth grooves (12a) on both sides in the circumferential direction of the first protrusion (16a). A parking lock device for a transmission. The parking pole drive mechanism (21) includes a first cone member (22) that is driven by contact with the first parking pole (16), and a second cone that is driven by contact with the second parking pole (17). A member (28), and a connecting member (23) for connecting and moving the first cone member (22) and the second cone member (28) together;
When the parking lock is operated, the moving distance until the second cone member (28) comes into contact with the second parking pole (17) is determined by the first cone member (22). The parking lock device for a transmission according to claim 1, wherein the parking lock device is longer than a moving distance until contact.   The parking pole drive mechanism (21) includes a lost motion mechanism (36) for temporarily separating the second cone member (28) from the connecting member (23) when the parking lock is released. The transmission parking lock device according to claim 2.   The parking pawl drive mechanism (21) moves from the first parking pawl (16) side to the second parking pawl (17) side to act on the first parking pawl (16) when operating the parking lock. The parking lock device for a transmission according to claim 1, further comprising a cone member (41) that comes into contact with the second parking pole (17) and drives to the operating position after driving to the operating position.   The parking pawl drive mechanism (21) includes a lock mechanism (46) for locking the second parking pawl (17) in an operating position, and the cone member (41) is used for the first parking pawl when releasing the parking lock. The parking lock device for a transmission according to claim 4, further comprising: an unlocking means (44) for unlocking the lock mechanism (46) after returning (16) to the release position.   6. The transmission parking according to claim 1, further comprising a damper (45) for buffering movement of the second parking pole (17) from the operating position to the release position. 7. Locking device.   The second parking gear (13) is divided into an inner periphery (13b) and an outer periphery (13c), and the inner periphery (13b) and the outer periphery (13c) are connected by an annular elastic member (13d). The parking lock device for a transmission according to any one of claims 1 to 6, wherein the parking lock device is for a transmission.

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