JP2009162346A - Detent mechanism and automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detent mechanism capable of mitigating impact on a detent plate for protecting the detent plate and a body case when the detent plate rotates beyond a rotation range, and an automatic transmission. <P>SOLUTION: The detent plate 14 is formed with a penetration hole 23 extending to the rotation direction of the detent plate 14 and having engagement parts 23a, 23b at both end parts in the extending direction, and also provided with a torsion coil spring 24 engaging with the engagement parts 23a, 23b for generating elastic force when the detent plate 14 rotates to one direction and the other direction of the rotation direction beyond the rotation range. The torsion coil spring 24 comprises one end part 24a slidably provided in the penetration hole 23, the other end part 24b fixed to a valve case 25, and a winded part 24c provided between one end part 24a and the other end part 24b of the torsion coil spring 24 to be winded around a control rod 18 of the detent plate 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a detent mechanism and an automatic transmission, and more particularly, to a detent mechanism and an automatic transmission designed to reduce an impact when a detent plate that performs a shift operation of the automatic transmission overstrokes in a swinging direction.

  In an automatic transmission for a vehicle or an automatic transmission for a hybrid vehicle having both an internal combustion engine and an electric motor as a prime mover, the operation of a shift lever or a shift switch is electrically detected and the shift switching means is electrically controlled. There is one that adopts a so-called shift-by-wire control system that controls with a possible actuator and replaces the mechanical operation linkage with an electric operation system, thereby increasing the operation method and the degree of freedom of arrangement of the shift operation unit (For example, refer to Patent Document 1).

  This shift-by-wire is equipped with a shift range switching valve that performs automatic shifting, and the shift range switching valve is operated by a driver to perform various shift ranges such as a parking range, a reverse range, a neutral range, and a drive range. With this, the hydraulic pressure supply state changes to a desired state, and the vehicle can be parked or stopped or a predetermined traveling mode can be achieved.

  This type of shift-by-wire is attached to the detent plate and the detent plate so as to be swingable by driving of the actuator, and various types such as the parking range, reverse range, neutral range, drive range, etc. described above according to the swing position of the detent plate. A shift range switching valve that strokes to the shift range is provided, and the detent plate swings within the shift range by the actuator.

  In other words, when one side of the detent plate swing direction is in the parking range and the other side of the swing direction is in the drive range, the reverse range and neutral range are positioned at the swing position between the parking range and the drive range. The swing range of the detent plate is set so as to swing between the drive range and the parking range.

  Further, a parking lock mechanism that mechanically fixes any rotating member in the power transmission path from the prime mover to the drive wheel when the shift lever is operated to the parking range is provided. It is designed to operate in conjunction with the detent plate.

  The parking lock mechanism engages and disengages with any rotating member in the power transmission path from the prime mover to the driving wheel, and engages and rotates with the rotating member when the parking range is selected by the shift operation. A rocking-type lock claw for fixing the member, a linear motion cam for swinging the lock claw, one end portion is coupled to the linear motion cam and the other end portion is coupled to the detent mechanism, and the detent mechanism is a parking range And a parking rod that moves the linear cam back and forth as it swings between the non-parking range and swings the lock pawl via the parking rod by swinging the detent mechanism by the actuator. It is supposed to be moved.

  By the way, if the detent plate swings beyond the swing range due to excessive torque applied to the detent plate for some reason, the detent plate will be in a swing position different from the drive range or parking range. The shift of the detent plate may not be able to be performed normally and the parking lock mechanism may be damaged due to excessive torque applied to the parking lock mechanism. It is necessary not to exceed it.

  Conventionally, to control the swing of the detent plate, the detent plate is interlocked with the shift lever, fitted with the detent plate having a plurality of notches at the end, and the notch of the detent plate. A detent mechanism in an automatic transmission having a detent spring to be held and a stopper portion that is provided in a transmission case as a main body case and regulates a swing range in both directions of the detent plate by contacting the detent plate is known. (For example, refer to Patent Document 2).

  In this detent mechanism, when the detent plate swings beyond the swing range due to an excessive torque applied to the detent plate for some reason from the actuator, the detent plate collides with the stopper part, The swing of the detent plate can be regulated.

For this reason, it is possible to prevent the shift switching from being performed normally, and it is possible to protect the parking lock mechanism by preventing an excessive torque from being applied to the parking lock mechanism.
JP 2001-271925 A JP 2006-260435 A

  However, in such a conventional detent mechanism, when the detent plate exceeds the swing range, the detent plate collides with the stopper portion. There was a risk of damaging the machine case.

  The present invention has been made to solve the above-described conventional problems. When the detent plate swings beyond the swing range, the impact applied to the detent plate can be reduced. Another object of the present invention is to provide a detent mechanism and an automatic transmission that can protect a case and a main body case.

  In order to achieve the above object, the detent mechanism according to the present invention is (1) a detent plate that is provided so as to be swingable in conjunction with the operation of the operating means, and that selects a plurality of shift ranges in accordance with the swing position; A detent spring that fits into a notch provided on the outer periphery of the detent plate and holds the swing position of the detent plate according to a shift range; and a body case that supports the detent plate so as to be swingable. A detent mechanism provided with either of the detent plate or the main body case and extending in the swinging direction of the detent plate and having engaging portions at both ends in the extending direction. The range setting means and one end portion are slidably provided on the swing range setting means, and the other end portion is the detent plate Or provided on either one of the main body cases and engaged with the engaging portion of the swing range setting means when the detent plate swings in one direction and the other direction of the swing direction beyond the swing range. And a damper member that generates an elastic force.

  With this configuration, when the detent plate swings within the swing range linked to the operation of the operation means, one end of the damper member can be positioned within the swing range setting means, and the detent plate can be made smooth. be able to.

  When the detent plate swings beyond the swing range, one end of the damper member engages with an engagement portion provided at one end or the other end in the extending direction of the swing range setting means. Since the elastic force of the member is generated, the impact applied to the detent plate can be reduced.

  For this reason, when a detent plate collides with a main body case, it can prevent that a strong impact is added to a detent plate and a main body case, and can protect a detent plate and a main body case.

  In the detent mechanism described in (1) above, (2) the operation means includes an actuator that swings the detent plate by operating according to a shift range selected by a driver. .

  With this configuration, when an abnormality occurs in the actuator for some reason, when the detent plate swings beyond the swing range, one end of the damper member is one end in the extending direction of the swing range setting means or the other. Since the elastic force of the damper member is generated by engaging with the engaging portion provided at the end, the impact applied to the detent plate can be reduced.

  In the detent mechanism according to (1) or (2) above, (3) a plurality of notches provided in the detent plate correspond to each shift range of a plurality of shift ranges, and the detent spring is The detent plate is configured to be fitted into a notch corresponding to each shift range within the swing range of the detent plate.

  With this configuration, when the detent plate swings within the swing range linked to the operation of the operating means, the detent spring fits into the notch corresponding to each shift range formed on the detent plate. The shift range corresponding to the swing position of the detent plate can be reliably selected within the swing range.

  (4) In the detent mechanism according to any one of (1) to (3), (4) the swinging range setting means is provided along either the detent plate or the body case along the swinging direction of the detent plate. The through hole is provided with a through hole into which one end portion of the damper member is inserted, and the engaging portion is composed of both end portions in the extending direction of the through hole.

  With this configuration, when the detent plate swings within the swing range linked to the operation of the operating means, one end of the damper member moves along the through-hole formed in the detent plate or the body case.

  Further, when the detent plate swings beyond the swing range, one end portion of the damper member can be engaged with one end portion or the other end portion in the extending direction of the through hole to generate the elastic force of the damper member. Therefore, the impact applied to the detent plate can be reduced.

  (5) In the detent mechanism according to any one of (1) to (3), (5) the swing range setting unit is provided along either the detent plate or the main body case along the swing direction of the detent plate. The rail-shaped projections are provided to extend and extend from both ends of the damper member, and the engaging portions are formed from both ends of the rail-shaped projections.

  With this configuration, when the detent plate swings within the swing range linked to the operation of the operating means, one end of the damper member moves along the rail-shaped protrusion formed on the detent plate or the body case.

  Also, when the detent plate swings beyond the swing range, one end of the damper member engages with one end or the other end of the rail-shaped projection in the extending direction to generate the elastic force of the damper member. Therefore, the impact applied to the detent plate can be reduced.

  In the detent mechanism according to any one of (1) to (5), (6) the main body case is provided to face one direction side or the other direction side of the swing range of the detent plate, and the detent A stopper portion that regulates the swinging of the detent plate in one direction and the other direction by contacting the plate, the stopper portion swinging beyond the swinging range, and the damper member The detent plate abuts after the elastic range is generated by engaging with the engaging portion of the swing range setting means.

  With this configuration, when the detent plate swings beyond the swing range, one end of the damper member engages with an engagement portion provided at one end or the other end in the extending direction of the swing range setting means. Since the elastic force of the damper member is generated, the impact applied to the detent plate can be reduced. Next, when the detent plate further swings, the detent plate comes into contact with the stopper portion and the swing of the detent plate is restricted.

  When the detent plate swings beyond the swing range, the damper member can reduce the swing speed of the detent plate, so that the impact when the detent plate comes into contact with the stopper portion can be reduced. Detent plate and body case can be protected.

  In the detent mechanism according to any one of (1) to (6), the damper member has a torsion coil spring, and the torsion coil spring is slidably provided on the swing range setting means. One end portion, the other end portion fixed to the detent plate or the body case, and a winding provided between the one end portion and the other end portion of the torsion coil spring and wound around the swing shaft of the detent plate. It is comprised from what has a rotation part.

  With this configuration, when the detent plate swings beyond the swing range, one end of the torsion coil spring is engaged with the engagement portion provided at one end or the other end in the extending direction of the swing range setting means. In addition, since the elastic force of the torsion coil spring can be generated, the impact applied to the detent plate can be reduced with a simple and inexpensive configuration.

An automatic transmission having the detent mechanism according to any one of (1) to (7) above, (8) a plurality of rotating members in a power transmission path for transmitting power from a prime mover of a vehicle to a drive wheel side; ,
The rotating member in the power transmission path is interposed between the detent plate and the rotating member in the power transmission path, and when the detent plate is swung to the parking range in conjunction with the operation of the operating means. And a parking lock mechanism that mechanically releases the fixing of the rotating member when the detent plate is swung to the non-parking range in conjunction with the operation of the operating means. It is configured.

  With this configuration, when the detent plate swings beyond the swing range, one end of the damper member engages with an engagement portion provided at one end or the other end in the extending direction of the swing range setting means. Since the elastic force of the damper member is generated, the impact applied to the detent plate can be reduced.

  At this time, since the impact applied to the detent plate can be reduced, it is possible to prevent an impact from being applied to the parking lock mechanism from the detent plate when the detent plate swings to the parking range. As a result, the parking lock mechanism can be prevented from being strongly engaged with the rotating member, and the parking lock mechanism and the rotating member can be protected.

  According to the present invention, when the detent plate swings beyond the swing range, the impact applied to the detent plate can be reduced, and the detent mechanism and the automatic transmission can protect the detent plate and the main body case. Can be provided.

  Hereinafter, embodiments of a detent mechanism and an automatic transmission according to the present invention will be described with reference to the drawings.

(First embodiment)
FIGS. 1-8 is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention.

First, the configuration will be described.
In FIG. 1, the shift range switching device includes an operation unit 1 for selecting and commanding the shift range of the automatic transmission 10 by the driver operating a shift lever (not shown), and the shift range of the automatic transmission 10. A display unit 2 for displaying a switching state; a shift range switching mechanism 3 for switching a shift range incorporated in the automatic transmission 10; an actuator 4 as an operating means for driving the shift range switching mechanism 3; A drive circuit 5 for driving the actuator 4, a rotation angle sensor 6 installed on the output shaft of the actuator 4 to detect the rotation angle, a shift range switching command input from the operation unit 1, and the rotation angle sensor 6 Upon receiving the detection signal, the automatic transmission 10 is activated via the drive circuit 5 so that the shift range of the automatic transmission 10 becomes a travel range corresponding to the switching command. A control circuit 7 that drives the actuator 4 and operates the shift range switching mechanism 3 and when the actuator 4 is inoperable due to some cause and cannot be operated, that is, when the output shaft of the actuator 4 is locked. A person manually operates the shift range switching mechanism 3 and includes an auxiliary switching lever 8 for switching the shift range.

  The control circuit 7 is composed of a microcomputer composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and drives the actuator 4 to shift the automatic transmission 10. In addition to the shift range switching control for switching the range, shift range display control for displaying the shift range switching state on the display unit 2 is executed.

  The shift range switching mechanism 3 constitutes a detent mechanism, and the shift range of the automatic transmission 10 can be changed to a parking range (P), a reverse range (R), a neutral range (N), and a drive range (D). This is for switching to the range in order.

  In FIG. 2, a shift range switching mechanism 3 includes a range switching valve 11 and a manual for switching control of engagement and disengagement of a friction engagement device (not shown) in the automatic transmission 10 according to the switching state of each travel range. When the shift range is switched to the parking range, the parking gear 15 provided on an output shaft (not shown) of the automatic transmission 10 is parked. It comprises a parking rod 17 for engaging the pole 16 and stopping the rotation of the output shaft, an auxiliary switching lever 8, and a control rod 18 to which the detent plate 14 and the auxiliary switching lever 8 are fixed.

  The detent plate 14 has a plurality of notches 14a to 14d formed at the outer peripheral upper end, the notch 14a is in the parking range, the notch 14b is in the reverse range, and the notch 14c is in the neutral range. The notches 14d correspond to drive ranges (see FIG. 4).

  This shift range switching mechanism 3 causes the detent plate 14 to swing around the axis of the control rod 18 by the rotation of the control rod 18, and shifts the range switching valve 11 and the parking rod 17 connected to the detent plate 14. In this embodiment, in order to switch the shift range electrically, the output shaft of the actuator 4 (ACT output shaft 21) is directly connected to the control rod 18 in this embodiment. Yes. That is, the shift range switching mechanism 3 of the present embodiment is a so-called shift-by-wire system.

  The auxiliary switching lever 8 attached to the control rod 18 is installed so that the driver can manually turn the control rod 18 by operating the tip of the auxiliary switching lever 8 during operation. Although 8 is not normally used, it is used when shifting manually when the ACT output shaft 21 is locked.

  FIG. 3 is a diagram showing an outline of the actuator 4. In FIG. 3, the actuator 4 is directly connected to a motor 19 as a power generation source, an output rotation shaft 19 a of the motor 19, and a reduction mechanism 20 that reduces the rotation speed of the motor 19 at a predetermined reduction ratio, and a reduction mechanism 20. The ACT output shaft 21 is directly connected to the output rotation shaft 20a and is formed with a fitting hole 21a for fitting the tip end portion of the control rod 18.

  The motor 19 is a so-called brushless DC motor, and rotates in both directions by controlling the current supplied from the drive circuit 5 to a three-phase winding (not shown) constituting the stator of the motor 19 by the control circuit 7. And can be stopped at a desired rotational position.

  The rotation angle sensor 6 is attached to the ACT output shaft 21, and the tip of the control rod 18 is fitted into the fitting hole 21a, so that the ACT output shaft 21 and the control rod 18 are directly connected. .

  The shift range is switched when the detent plate 14 swings through the control rod 18, and depends on the rotation angle of the control rod 18, that is, the swing position of the detent plate 14. It is possible to switch to various shift ranges.

  Specifically, the rotation of the ACT output shaft 21 for switching the shift range is controlled by the control circuit 7 controlling the rotation of the motor 19 via the drive circuit 5 based on the switching command input from the operation unit 1. Do.

  When a shift range switching command is input from the operation unit 1, the control circuit 7 performs PWM control on the drive circuit 5 to control the current flowing in the motor 19, thereby controlling the rotation of the ACT output shaft 21 and the control rod 18. The detent plate 14 is controlled to swing to a swing position corresponding to a desired shift range.

  The detent spring 13 is held by a valve case 25 of the manual valve 12 that forms a part of the transmission case 22 with a base end portion of the detent spring 13, and a fitting portion 13 a at the distal end portion of the notched portions 14 a to 14 d. It fits in either one.

  Then, when the control circuit 7 controls the detent plate 14 to swing to the swing position corresponding to the desired shift range, the detent spring 13 causes the notch portions 14a to 14a of the detent plate 14 corresponding to the shift range. The detent plate 14 is held at the swing position corresponding to the shift range by being fitted to any one of 14d.

  The parking lock mechanism includes a parking pole 16 and a parking rod 17 interposed between the detent plate 14 and the parking gear 15. The parking gear 15 as a rotating member is provided on the output shaft of the plurality of rotating members provided in the power transmission path of the automatic transmission 10 that transmits power from the engine, which is the prime mover of the vehicle, to the drive wheel side. The parking gear 15 is mechanically fixed, that is, locked, by the projection 16a of the parking pole 16 being fitted to the parking gear 15.

  The parking pole 16 separates the protruding portion 16a from the parking gear 15 and the engaging position where the protruding portion 16a is engaged with the parking gear 15 in accordance with the advance and retreat of the linear cam 17a provided at the end of the parking rod 17. The linear cam 17a moves back and forth in response to the swing of the detent plate 14 to which the other end portion of the parking rod 17 is fixed.

  That is, when the detent plate 14 is swung to the parking range by the actuator 4, the parking pole 16 is swung to the engaging position by the linear cam 17a and the protrusion 16a is engaged with the parking gear 15. When the parking gear 15 is locked and the actuator 4 swings to the non-parking range (shift range other than the parking range), the parking cam 16a swings the parking pole 16 to the remote position by the linear motion cam 17a to By separating the parking gear 15, the parking gear 15 is unlocked.

  On the other hand, as shown in FIG. 4, the detent plate 14 is swingably provided in a transmission case as a main body case via a control rod 18, and the detent plate 14 has a swinging direction in the detent plate 14. A through hole 23 is formed along the swing range setting means.

  One end 24a of a torsion coil spring 24 constituting a damper member is slidably inserted into the through hole 23, and the other end 24b of the torsion coil spring 24 is fixed to the valve case 25. Yes.

  Further, the torsion coil spring 24 portion between the one end portion 24a and the other end portion 24b, that is, the central portion of the torsion coil spring 24 is wound around the outer peripheral portion of the control rod 18 as a swing shaft. The one end 24a of the torsion coil spring 24 has a spring force.

  Further, both end portions in the extending direction of the through hole 23 constitute engaging portions 23a and 23b, and when the detent plate 14 swings in one direction and the other direction of the swinging direction beyond the swinging range, One end portion of the torsion coil spring 24 is engaged with the engaging portion 23a or the engaging portion 23b to generate an elastic force.

  Therefore, the through-hole 23 of the present embodiment extends so as to be located within the swing range S of the detent plate 14, and the fitting portion 13 a of the detent spring 13 has a swing range S of the detent plate 14. Inside, it fits into the notches 14a-14d of the detent plate 14 corresponding to each shift range. That is, as shown in FIG. 4, the swing range S of the detent plate 14 is set to a range from the parking range (P) to the drive range (D).

  Further, the transmission case 22 and the valve case 25 are formed with stopper portions 22a and 25a, respectively, and the stopper portions 22a and 25a face one direction side or the other direction side of the swing range of the detent plate 14. Is provided.

  The stopper portions 22a and 25a are configured to restrict the swing of the detent plate 14 by engaging the detent plate 14 when the detent plate 14 swings beyond the swing range.

Next, the operation will be described.
When a shift range switching operation is performed by the driver, for example, a switching command for switching from the parking range, neutral or drive range to the parking range is input to the control circuit 7 by the operation unit 1. The control circuit 7 sets the rotation direction and angle of the ACT output shaft 21 necessary for switching to the parking range based on this switching command.

  Next, when the control circuit 7 outputs a switching command signal to the drive circuit 5, the drive circuit 5 drives the actuator 4 to rotate the control rod 18, thereby swinging the detent plate 14.

  At this time, as shown in FIG. 5, the detent plate 14 is swung by the detent spring 13 by swinging the detent plate 14 to a position where the fitting portion 13 a of the detent spring 13 is fitted in the notch portion 14 d of the detent plate 14. Is held at the swing position corresponding to the parking range.

  At this time, since the range switching valve 11 is moved in the axial direction by the detent plate 14, known shift control of the automatic transmission 10 is performed so that the manual valve 12 is shifted to a position corresponding to the parking range.

  Further, as the detent plate 14 swings to the parking range, the linear cam 17a moves forward via the parking rod 17, so that the protrusion 16a of the parking pole 16 engages the parking gear 15, thereby The gear 15 is locked.

  Here, when the detent plate 14 swings within the normal swing range S, that is, within the swing range S between the parking range and the drive range, the one end 24a of the torsion coil spring 24 is inserted into the through hole. The detent plate 14 is swung so as not to engage with the engaging portions 23a and 23b of 23.

  However, when an abnormality occurs in the actuator 4 for some reason, a situation occurs in which the detent plate 14 swings beyond the swing range S, and the detent plate 14 exceeds the swing range S in the parking range direction. When the torsion coil spring 24 is swung, the one end portion 24a of the torsion coil spring 24 is engaged with the engaging portion 23b, so that the elastic force of the torsion coil spring 24 is generated and the swing speed of the detent plate 14 is reduced. Become.

  As shown in FIG. 7, the detent plate 14 is restricted from swinging by contacting the stopper portion 25 a of the valve case 25 while being biased by the torsion coil spring 24. At this time, since the swinging speed of the detent plate 14 is small, the impact when the detent plate 14 abuts against the stopper portion 25a is very small.

  Further, when the detent plate 14 is in contact with the stopper portion 25a, the fitting portion 13a of the detent spring 13 is slightly lifted from the notch portion 14a toward the stopper portion 25a. The hydraulic control is performed so that the parking range is set, and the parking pawl 16 is rotated to the engagement position by the linear motion cam 17a and the protrusion 16a is engaged with the parking gear 15, whereby the parking gear 15 is Locked.

  On the other hand, when the driver performs the shift range switching operation, for example, when a switching command for switching from the parking range to the drive range is input to the control circuit 7 by the operation unit 1, the control circuit 7 The rotation direction and angle of the ACT output shaft 21 necessary for switching to the drive range are set based on the above.

  Next, when the control circuit 7 outputs a switching command signal to the drive circuit 5, the drive circuit 5 drives the actuator 4 to rotate the control rod 18, thereby swinging the detent plate 14.

  At this time, as shown in FIG. 6, the detent plate 14 is swung by the detent spring 13 by swinging the detent plate 14 to the position where the fitting portion 13 a of the detent spring 13 is fitted in the notch portion 14 a of the detent plate 14. Is held at the swing position corresponding to the drive range.

  At this time, since the range switching valve 11 is moved in the axial direction by the detent plate 14, known shift control of the automatic transmission 10 is performed so that the manual valve 12 is shifted to a position corresponding to the drive range.

  Further, as the detent plate 14 swings to the drive range, the linear motion cam 17a moves backward via the parking rod 17, so that the protrusion 16a of the parking pole 16 is separated from the parking gear 15, so that the parking gear 15 is unlocked.

  Here, when the detent plate 14 swings within the normal swing range S, that is, within the swing range S between the parking range and the drive range, the one end 24a of the torsion coil spring 24 is inserted into the through hole. The detent plate 14 is swung so as not to engage with the engaging portions 23a and 23b of 23.

  However, when an abnormality occurs in the actuator 4 for some reason, a situation occurs in which the detent plate 14 swings beyond the swing range S, and the detent plate 14 exceeds the swing range S in the parking range direction. 8, when the one end 24a of the torsion coil spring 24 is engaged with the engaging portion 23b as shown in FIG. 8, the elastic force of the torsion coil spring 24 is generated, and the detent plate 14 swing speed becomes small.

  The detent plate 14 is restricted from swinging by abutting against the stopper portion 22a of the transmission case 22 while being biased by the torsion coil spring 24. At this time, since the swing speed of the detent plate 14 is low, the impact when the detent plate 14 abuts against the stopper portion 22a is very small.

  When the detent plate 14 is in contact with the stopper portion 22a, the fitting portion 13a of the detent spring 13 is slightly lifted from the notch portion 14a toward the stopper portion 22a. Hydraulic control is performed to achieve the drive range range.

  As described above, in the present embodiment, the detent plate 14 is formed with the through holes 23 extending in the swinging direction of the detent plate 14 and having the engaging portions 23a and 23b at both ends in the extending direction. A torsion coil spring 24 that engages with the engaging portions 23a and 23b to generate an elastic force when the detent plate 14 swings in one direction and the other direction of the swing direction beyond the swing range S; The torsion coil spring 24 includes one end 24a slidably provided in the through hole 23, the other end 24b fixed to the valve case 25, and one end 24a and the other end of the torsion coil spring 24. 24b, and includes a winding portion 24c wound around the control rod 18 of the detent plate 14. Therefore, the detent is within a swing range linked to the operation of the actuator 4. When the plate 14 swings, the torsion one end 24a of the coil spring 24 can be positioned in the extending direction range of the through hole 23, thereby the detent plate 14 smoothly.

  Further, when the detent plate 14 swings beyond the swing range, the one end portion 24a of the torsion coil spring 24 engages with the engaging portion 23a or the engaging portion 23b of the through hole 23, thereby twisting. Since the elastic force of the coil spring 24 can be generated, the impact applied to the detent plate 14 can be reduced.

When the detent plate 14 swings beyond the swing range S, the swing speed of the detent plate 14 can be reduced by the biasing force of the torsion coil spring 24. The impact at the time of contacting the stopper portion 25a can be reduced. As a result, the detent plate 14, the transmission case 22, and the valve case 25 can be protected.
In particular, the shift control according to the present embodiment employs a shift-by-wire system in which the shift range is selected by swinging the detent plate 14 by the actuator 4, and therefore, when an abnormality occurs in the actuator 4 for some reason. In addition, when the detent plate 14 swings beyond the swing range S, the impact applied to the detent plate 14 can be reduced.

  In the present embodiment, since the torsion coil spring 24 is used as the damper member, the impact applied to the detent plate 14 can be reduced with a simple and inexpensive configuration.

  In the present embodiment, the plurality of notches 14a to 14d provided at the outer peripheral end of the detent plate 14 correspond to the parking range, reverse range, neutral range, and drive range, respectively. Since the fitting portion 13a is fitted into the notches 14a to 14d corresponding to the respective shift ranges within the swing range S of the detent plate 14, the swing of the detent plate 14 is within the swing range S of the detent plate 14. The shift range according to the position can be selected reliably.

  Further, in the present embodiment, when the detent plate 14 is interposed between the detent plate 14 and the parking gear 15 in the power transmission path of the automatic transmission 10 and the detent plate 14 is swung to the parking range by the actuator 4, A parking lock mechanism that mechanically fixes the parking gear 15 in the transmission path and mechanically releases the parking gear 15 when the actuator 4 swings the detent plate 14 to the non-parking range; Since the impact applied to the detent plate 14 when the detent plate 14 swings beyond the swing range S can be reduced, when the detent plate 14 swings to the parking range, the parking lock mechanism is operated from the detent plate 14. Can prevent the shock .

  For this reason, it can prevent that the engaging part 16a of the parking pole 16 of a parking lock mechanism strongly engages with the parking gear 15, and can protect the parking pole 16 and the parking gear 15.

(Second Embodiment)
FIG. 9 and FIG. 10 are views showing a second embodiment of the detent mechanism and the automatic transmission according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and described. Omitted.
9 and 10, the detent plate 14 is formed with a rail-shaped protrusion 31 as a swing range setting means along the swing direction of the detent plate 14. The protrusion 31 is a torsion coil spring. The one end 24a of 24 is surrounded.

  Further, the protrusion 31 of the present embodiment extends so as to be located within the swing range S of the detent plate 14, and the fitting portion 13 a of the detent spring 13 is within the swing range S of the detent plate 14. In FIG. 4, the cutout portions 14a to 14d of the detent plate 14 corresponding to the parking range, reverse range, neutral range and drive range are fitted.

  Further, both end portions of the protrusion 31 constitute engaging portions 31a and 31b, which are twisted when the detent plate 14 swings in one direction and the other direction of the swing direction beyond the swing range S. One end of the coil spring 24 is engaged with the engaging portion 31a or the engaging portion 31b to generate an elastic force.

  In the present embodiment, the detent plate 14 is formed with protrusions 31 extending in the swing direction of the detent plate 14 and having engaging portions 31a and 31b at both ends in the extending direction. Since the one end portion 24 a of the torsion coil spring 24 is surrounded by 31, the end portion 24 a of the torsion coil spring 24 protrudes when the detent plate 14 swings within the swing range S linked to the operation of the actuator 4. Thus, the detent plate 14 can be made smooth.

  Further, when the detent plate 14 swings beyond the swing range S, the one end portion 24a of the torsion coil spring 24 is engaged with the engaging portion 31a or the engaging portion 31b of the protrusion 31, thereby twisting. Since the elastic force of the coil spring 24 can be generated, the impact applied to the detent plate 14 can be reduced.

  As a result, when the detent plate 14 swings beyond the swing range S, the swing speed of the detent plate 14 can be reduced by the urging force of the torsion coil spring 24, and the detent plate 14 can move to the stopper portion 22a or The impact at the time of contacting the stopper portion 25a can be reduced. As a result, the detent plate 14, the transmission case 22, and the valve case 25 can be protected. In addition, as other functions and effects, the same functions and effects as those of the first embodiment can be obtained.

(Third embodiment)
FIG. 11 is a diagram showing a third embodiment of the detent mechanism and the automatic transmission according to the present invention. The same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted.
In FIG. 11, the valve case 25 is formed with a through hole 36 as a swing range setting means along the swing direction of the detent plate 14. One end portion 37 a of a torsion coil spring 37 constituting a damper member is slidably inserted into the through hole 36, and the other end portion 37 b of the torsion coil spring 37 is fixed to the detent plate 14. Yes.

  Further, the torsion coil spring 37 portion between the one end portion 37a and the other end portion 37b, that is, the central portion of the torsion coil spring 37 is wound around the control rod 18 to constitute a winding portion 37c. One end portion 37a of the torsion coil spring 37 has a spring force.

  Further, both end portions of the through hole 36 in the extending direction constitute engaging portions 36a and 36b, and when the detent plate 14 swings in one direction and the other direction of the swinging direction beyond the swinging range S. The one end portion of the torsion coil spring 37 is engaged with the engaging portion 36a or the engaging portion 36b to generate an elastic force.

  Therefore, the through hole 36 of the present embodiment extends over the length that is located within the swing range S of the detent plate 14, that is, the swing range S 1. The part 13a fits into the notches 14a to 14d of the detent plate 14 corresponding to the parking range, reverse range, neutral range and drive range within the swing range S of the detent plate 14.

  In the present embodiment, the valve case 25 is formed with the through holes 36 extending in the swinging direction of the detent plate 14 and having engaging portions 36a and 36b at both ends in the extending direction. When the detent plate 14 swings within the swing range S interlocked with the operation of the actuator 4, the one end portion 37 a of the torsion coil spring 37 can be positioned within the extending direction range of the through hole 36. Can be made smooth.

  Further, when the detent plate 14 swings beyond the swing range S, the one end portion 37a of the torsion coil spring 37 is engaged with the engaging portion 36a or the engaging portion 36b of the through hole 36, thereby twisting. Since the elastic force of the coil spring 37 can be generated, the impact applied to the detent plate 14 can be reduced.

  As a result, when the detent plate 14 swings beyond the swing range S, the swing speed of the detent plate 14 can be reduced by the urging force of the torsion coil spring 37, and the detent plate 14 can move to the stopper portion 22a or The impact at the time of contacting the stopper portion 25a can be reduced. As a result, the detent plate 14, the transmission case 22, and the valve case 25 can be protected.

  In addition, as other functions and effects, the same functions and effects as those of the first embodiment can be obtained. Although the through hole 36 is provided in the valve case 25 in the present embodiment, it may be provided in the transmission case 22.

(Fourth embodiment)
FIGS. 12 and 13 are diagrams showing a fourth embodiment of the detent mechanism and the automatic transmission according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and described. Omitted.
12 and 13, the valve case 25 is formed with a rail-like protrusion 41 as a swing range setting means along the swing direction of the detent plate 14. The protrusion 41 is a torsion coil spring. The one end 42a of 42 is surrounded.

  The other end portion 42b of the torsion coil spring 42 is fixed to the detent plate 14, and the torsion coil spring 42 portion between the one end portion 42a and the other end portion 42b, that is, the central portion of the torsion coil spring 42 is The wound portion 37c is wound around the control rod 18, and one end portion 37a of the torsion coil spring 37 has a spring force.

  Further, the protrusion 41 of the present embodiment extends over a length that is located within the swing range S of the detent plate 14, that is, the swing range S 1. 13a fits into the notches 14a to 14d of the detent plate 14 corresponding to the parking range, reverse range, neutral range and drive range within the swing range S of the detent plate 14.

  Further, both end portions of the projection 41 constitute engaging portions 41a and 41b, which are twisted when the detent plate 14 swings in one direction and the other direction of the swing direction beyond the swing range S. One end portion of the coil spring 42 is engaged with the engaging portion 41a or the engaging portion 41b to generate an elastic force.

  In the present embodiment, the valve case 25 is formed with protrusions 41 extending in the swing direction of the detent plate 14 and having engaging portions 41a and 41b at both ends in the extending direction. Since one end portion 42 a of the torsion coil spring 42 is surrounded by 41, when the detent plate 14 swings within the swing range S interlocked with the operation of the actuator 4, the one end portion 42 a of the torsion coil spring 42 projects. Thus, the detent plate 14 can be made smooth.

  Further, when the detent plate 14 swings beyond the swing range S, the one end portion 42a of the torsion coil spring 42 is engaged with the engaging portion 41a or the engaging portion 41b of the protrusion 41, thereby twisting. Since the elastic force of the coil spring 42 can be generated, the impact applied to the detent plate 14 can be reduced.

  As a result, when the detent plate 14 swings beyond the swing range S, the swing speed of the detent plate 14 can be reduced by the biasing force of the torsion coil spring 42, and the detent plate 14 can be The impact at the time of contacting the stopper portion 25a can be reduced. As a result, the detent plate 14, the transmission case 22, and the valve case 25 can be protected.

  In addition, as other functions and effects, the same functions and effects as those of the first embodiment can be obtained. In the present embodiment, the protrusion 41 is provided on the valve case 25, but it may be provided on the transmission case 22.

(Fifth embodiment)
FIG. 14 is a diagram showing a fifth embodiment of the detent mechanism and the automatic transmission according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the first to fourth embodiments, a part of the transmission case 22 is shown. The transmission case 22 is provided so as to cover the shift range switching mechanism 3.

In FIG. 14, a protrusion 22b is provided on the side wall of the transmission case 22 facing the detent plate 14, and the protrusion 22b has a base end portion of a bar spring 45 (shown by a broken line) as a damper member. The other end is attached, and a pin 45a made of resin, metal or the like is provided at the tip (one end) of the bar spring 45.
The reason why the protruding portion 22 b is provided is to reduce the distance when there is a distance between the transmission case 22 and the detent plate 14. Further, the side wall of the main body case 22 is provided on the front side with respect to the detent plate of FIG. 1, and the operation of the detent plate 14 will be described with reference to FIG.

The bar spring 45 is configured not to engage with the engaging portions 23a and 23b within the swing range S of the detent plate 14, and the detent plate 14 exceeds the swing range S in one direction of swing and When the pin 45a of the rod spring 45 is engaged with the engaging portion 23a or the engaging portion 23b when the rod spring 45 swings in the other direction, the rod spring 45 generates an elastic force.
In the present embodiment, when the detent plate 14 swings within the swing range interlocked with the operation of the actuator 4, the pin 45 a of the bar spring 45 may be positioned within the extending direction range of the through hole 23. The detent plate 14 can be smoothly swung.

  When the detent plate 14 swings beyond the swing range S, the pin 45a of the bar spring 45 engages with the engaging portion 23a or the engaging portion 23b of the through hole 23, so that the elasticity of the bar spring 45 is reached. Since a force can be generated, the impact applied to the detent plate 14 can be reduced.

  As a result, when the detent plate 14 swings beyond the swing range S, the swing speed of the detent plate 14 can be reduced by the biasing force of the bar spring 45, and the detent plate 14 can be stopped by the stopper portion 22a or the stopper portion. The impact at the time of contacting with 25a can be reduced. As a result, the detent plate 14, the transmission case 22, and the valve case 25 can be protected.

  Further, as other operational effects, in addition to being able to obtain the same operational effects as in the first embodiment, in the present embodiment, the damper member is composed of the rod spring 45, so that it is simpler. In addition, the impact applied to the detent plate 14 can be reduced by a cheaper configuration.

In each of the above embodiments, the detent mechanism is applied to a shift-by-wire automatic transmission. However, the present invention is not limited to this, and is applied to an automatic transmission in which a shift lever and a detent plate 14 are connected by a wire cable. May be.
When the detent mechanism is applied to this automatic transmission, an excessive load is applied to the detent plate 14 from the shift lever through the wire table by the driver when a shift operation is performed in the parking range or the drive range. In such a case, the impact applied to the detent plate 14 can be reduced, and the same effects as those in the above embodiments can be obtained.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the detent mechanism and the automatic transmission according to the present invention can reduce the impact applied to the detent plate when the detent plate swings beyond the swing range. The detent mechanism has an effect that it can be protected, and is useful as a detent mechanism, an automatic transmission, and the like that reduce an impact when a detent plate that performs a shift operation of the automatic transmission overstrokes in the swinging direction.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a whole block diagram of the shift range switching apparatus of an automatic transmission. It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a schematic block diagram of a detent mechanism. It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a schematic block diagram of an actuator. It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a front view of a detent plate. It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a figure which shows the state which the detent plate rock | fluctuated to the parking range. It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a figure which shows the state which the detent plate rock | fluctuated to the drive range. It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a figure which shows the state which the detent plate contacted the stopper part exceeding the parking range. It is a figure which shows 1st Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a figure which shows the state which the detent plate contacted the stopper part exceeding the drive range. It is a figure which shows 2nd Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a front view of a detent plate. It is a figure which shows 2nd Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a figure which shows the positional relationship of a torsion coil spring and a rail-shaped protrusion. It is a figure which shows 3rd Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a front view of a detent plate. It is a figure which shows 4th Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a front view of a detent plate. It is a figure which shows 4th Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a figure which shows the positional relationship of a torsion coil spring and a rail-shaped protrusion. It is a figure which shows 5th Embodiment of the detent mechanism and automatic transmission which concern on this invention, and is a figure which shows the positional relationship of a bar spring and a through-hole.

Explanation of symbols

3 Shift range switching mechanism (detent mechanism)
4 Actuator (operating means)
DESCRIPTION OF SYMBOLS 10 Automatic transmission 13 Detent spring 14 Detent plate 14a-14d Notch 15 Parking gear (rotating member)
16 Parking pole (parking lock mechanism)
17 Parking rod (parking lock mechanism)
22 Transmission case (main body case)
22a, 25a Stopper portion 23, 36 Through hole (oscillation range setting means)
23a, 23b, 36a, 36b Engaging portion 24, 37, 42 Torsion coil spring (damper member)
24a, 37a, 42a One end 24b, 37b, 42b The other end 24c, 37c, 42c Winding part 25 Valve case (main body case)
31, 41 Protrusion (oscillation range setting means)
31a, 31b, 41a, 41b Engagement portion 45 Bar spring (damper member)

Claims (8)

The detent plate is provided so as to be swingable in conjunction with the operation of the operation means, and selects a plurality of shift ranges according to the swing position, and is fitted into a notch provided in the outer peripheral portion of the detent plate, In a detent mechanism comprising a detent spring that holds the swing position of the detent plate according to a shift range, and a main body case that swingably supports the detent plate.
A swing range setting means provided on either the detent plate or the main body case, extending over the swing direction of the detent plate, and having engaging portions at both ends in the extending direction;
One end is slidably provided on the swing range setting means, and the other end is provided on the other of the detent plate or the main body case, and the detent plate moves beyond the swing range in the swing direction. And a damper member that generates an elastic force by engaging with an engaging portion of the swing range setting means when swinging in one direction and the other direction. 2. The detent mechanism according to claim 1, wherein the operation unit includes an actuator that swings the detent plate by operating according to a shift range selected by a driver. A plurality of notches provided in the detent plate correspond to each shift range of a plurality of shift ranges,
3. The detent mechanism according to claim 1, wherein the detent spring is fitted into a notch corresponding to each shift range within a swing range of the detent plate. The swing range setting means is provided in either the detent plate or the main body case so as to extend along the swing direction of the detent plate, and has a through hole through which one end of the damper member is inserted. Have
The detent mechanism according to any one of claims 1 to 3, wherein the engaging portion includes both end portions in the extending direction of the through hole. The swing range setting means is provided on either the detent plate or the main body case so as to extend along the swing direction of the detent plate, and from a rail-shaped protrusion surrounding one end of the damper member. The detent mechanism according to any one of claims 1 to 3, wherein the engaging portion includes both end portions in the extending direction of the rail-shaped protrusion. The main body case is provided facing one direction side or the other direction side of the swing range of the detent plate, and restricts swinging of the detent plate in one direction and the other direction by contacting the detent plate. Having a stopper,
The stopper portion swings the detent plate beyond the swing range, and after the damper member engages with the engaging portion of the swing range setting means and generates an elastic force, the detent plate touches the stopper portion. The detent mechanism according to any one of claims 1 to 5, wherein the detent mechanism contacts with each other. The damper member has a torsion coil spring, and the torsion coil spring has one end slidably provided on the swing range setting means, and the other end fixed to the detent plate or the body case. 7. A winding portion provided between one end portion and the other end portion of the torsion coil spring and wound around a swing shaft of the detent plate. The detent mechanism according to any one of claims. An automatic transmission having the detent mechanism according to any one of claims 1 to 7,
A plurality of rotating members in a power transmission path for transmitting power from the prime mover of the vehicle to the drive wheels;
The rotating member in the power transmission path is interposed between the detent plate and the rotating member in the power transmission path, and when the detent plate is swung to the parking range in conjunction with the operation of the operating means. And a parking lock mechanism that mechanically releases the fixing of the rotating member when the detent plate is swung to a non-parking range in conjunction with the operation of the operating means. Automatic transmission featured.

Images