JP4176727B2 - Automatic transmission parking device - Google Patents

Description

  The present invention belongs to a technical field of a parking device for an automatic transmission that locks an output shaft to restrict travel when a parking range is selected.

  In a vehicle equipped with an automatic transmission, when the parking range is selected, the parking pole is rotated in conjunction with the operation of the select lever, and the parking gear connected to the pawl of the parking pole and the output shaft of the automatic transmission One that locks the output shaft by meshing with the tooth gap is known (see, for example, Patent Document 1).

  However, in the above prior art, when the meshing between the parking gear and the parking pole is released at the time of subsequent restart, there is a problem that a shock or abnormal noise caused by the torsion torque remaining in the power transmission system occurs. was there.

As a technology to prevent the remaining torsional torque, when the select lever is operated to the parking range, a meshing prevention device that prevents the parking gear and the parking pole from meshing with each other, and a parking gear that rotates by the torsional torque, prevents meshing. There is disclosed a parking device for an automatic transmission that includes a meshing prevention release device using a cam that places a member in a prevention release position (see Patent Document 2).
Japanese Patent Laid-Open No. 61-41622 Japanese Patent No. 3197904

  However, in the above-described prior art, when the select lever is operated to the parking range in a state where the rotation speed of the parking gear is high (for example, the vehicle speed is 15 km or more), So-called ratcheting, in which the parking pole is flipped with no fluttering with the parking gear, occurs. At this time, the meshing prevention device is also kept in contact with the flap by the parking gear while being repelled, so that there is a problem that durability is deteriorated or damaged due to wear.

  In particular, the line pressure is quickly supplied from the manual valve to the reverse clutch and the low and reverse brake via the one-way valve, and the oil is gradually discharged from the reverse clutch and the low and reverse brake through the orifice. In the hydraulic circuit configuration set to (see FIG. 1), the above problem becomes significant.

  In other words, even when a quick selection operation is performed from the neutral range to the reverse range to the parking range after the vehicle stops, a large amount of line pressure is applied to the reverse clutch and the low and reverse brake when the select lever passes the reverse range position. A large torsion torque is generated. Note that the line pressure while the vehicle is stopped when the engine is idling is smaller than the line pressure while the vehicle is running, but is a sufficiently large value as the torsion torque.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to reduce noise, shock, etc. during re-starting after parking without causing deterioration or damage due to wear. It is an object of the present invention to provide a parking device for an automatic transmission capable of achieving the above.

In order to achieve the above object, in the parking device for an automatic transmission according to the present invention, a parking gear, a parking pawl having a pawl that can engage with a tooth groove of the parking gear, and a select lever for moving to a parking range. A parking pole driving means that drives the parking pole to an engagement position that interlocks and engages the claw portion with the tooth gap, a regulation means that regulates driving of the parking pole by the parking pole driving means, and the parking A release means for releasing the restriction by the restriction means in conjunction with the rotation of the gear, the parking pole driving means being connected to the select lever and movable in the axial direction of the parking rod, and the parking rod A parking pole drive unit slidably mounted in the axial direction of the rod and one end of the park A spring connected to the parking rod and having the other end abutting against the parking pole driving portion and biasing the parking pole driving portion in a direction of driving the parking pole. characterized that you are configured to regulate the movement in the direction of driving said parking pole.

In the parking apparatus of an automatic transmission according to the present invention, when operating the select lever from the reverse range to the parking range, driving movement of the parking pawl of the parking pawl driving means is regulated by the regulating means. From this state, when the parking gear by twisting torque remaining in the power transmission system rotates, releasing means, you cancel the regulation of the parking pawl driving means by the restricting means with the rotation of the parking gear. Therefore, since the residual torque can be released, it is possible to reduce abnormal noise, shock, etc. when the vehicle restarts after parking.

Further, the parking range is selection in the running line, even when the ratcheting occurs without Kamiae and the parking gear and a parking pawl, never drop or damage of durability arises due to abrasion.

  Hereinafter, the best mode for carrying out the parking device for an automatic transmission according to the present invention will be described based on Examples 1 and 2.

First, the configuration will be described.
[Hydraulic circuit configuration]
FIG. 1 is a diagram illustrating a main part of a hydraulic circuit of the automatic transmission according to the first embodiment.
An oil pump 1 driven by the engine, a pressure regulator valve 2 that regulates the discharge pressure of the oil pump 1 as a line pressure, and a first oil passage 4 that supplies the hydraulic pressure discharged from the pressure regulator valve 2 to the manual valve 3 A second oil passage 6 for supplying the hydraulic pressure discharged from the manual valve 3 to the reverse clutch 5 and a third oil passage 8 for supplying the hydraulic pressure of the second oil passage 6 to the low and reverse brake 7 are provided. .

  In the second oil passage 6, a one-way valve 6 a that allows a flow from the manual valve 3 to the reverse clutch 5 and prevents a flow from the reverse clutch 5 to the manual valve 3 and an orifice 6 b are provided in parallel. ing. The third oil passage 8 includes a one-way valve 8 a that allows a flow from the second oil passage 6 to the low and reverse brake 7 and prevents a flow from the low and reverse brake 7 to the second oil passage 6. The orifice 8b is provided in parallel.

  The drain port 3a of the manual valve 3 is set to close only when the reverse range is selected. Therefore, when the reverse range is selected, the reverse clutch 5 and the low-and-reverse brake 7 are engaged by the line pressure supplied from the manual valve 3, and in other cases, they are released.

  Further, the one-way valves 6a and 8a and the orifices 6b and 8b provided in the second oil passage 6 and the third oil passage 8 quickly supply the engagement hydraulic pressure to the reverse clutch 5 and the low and reverse brake 7, and the river The hydraulic pressure is gradually discharged from the scratch 5 and the low and reverse brake 7. Thereby, when the reverse range is selected, the reverse clutch 5 and the low and reverse brake 7 are quickly engaged, so that torque can be prevented from being lost. On the other hand, when another range is selected from the reverse range, the hydraulic pressure is gradually released from the reverse clutch 5 and the low-and-reverse brake 7, so that a shift shock can be reduced.

[Configuration of parking device]
FIG. 2 is a perspective view illustrating the parking apparatus according to the first embodiment.
The parking apparatus according to the first embodiment includes a parking gear 11, a parking pole 12, a manual shaft 13, a manual plate 14, a parking rod 15, a cone 16, and a regulating means 17.

  The parking gear 11 rotates together with the output shaft of the automatic transmission, and a tooth groove 11a is formed in the peripheral portion. The parking pole 12 has a claw portion 12 a that can be engaged with the tooth groove 11 a of the parking gear 11. The manual shaft 13 switches the oil passage of the manual valve 3 shown in FIG. 1 according to the driver's selection operation.

  The manual plate 14 is disposed on the first shaft 13 a of the manual shaft 13 and rotates integrally with the manual plate 14. The manual plate 14 is formed with a mountain valley portion 14a corresponding to each range (parking range, reverse range, neutral range, drive range, second speed range, first speed range) of the automatic transmission. A detent pin 14c provided at the tip of the detent spring 14b is engaged with the position corresponding to the current range in the mountain valley 14a to prevent the manual plate 14 from rotating and to determine the range position. Yes.

  The parking rod 15 and the cone 16 are interlocking with the manual plate 14 and are parking pole driving means for engaging the parking pole 12 and the parking gear 11 when the parking range is selected and releasing the engagement at other times. is there.

Parking rod 15, the proximal portion 1 5a is manual plate 14 and is rotationally coupled, is configured to axially move in accordance with the rotation of the manual plate 14. The cone 16 is attached to the vicinity of the distal end portion 15 b of the parking rod 15 via a coil spring 18 so as to be slidable in the axial direction, and is supported by a cone support member 19 on the lower side and the side surface.

  The cone 16 has a large-diameter portion 16a at the center in the axial direction, and tapered portions 16b and 16c are set at both ends thereof. Further, a step portion 16d facing the large diameter portion 16a is formed between the large diameter portion 16a and the tapered portion 16c.

  The cone support member 19 has a substantially U-shaped cross section, supports the cone 16 so as to be movable in the axial direction, and receives torque of the output shaft from the parking pole 12 via the cone 16. (See FIG. 3).

[Composition of regulatory measures]
FIG. 3 is a perspective view showing the detailed structure of the restricting means 17 of the first embodiment.
The restricting means 17 is disposed on the second shaft 21a parallel to the parking rod 15 so as to be rotatable and axially movable, and has a lever member 21 having a first end 21b and a second end 21c at both ends. And a coil spring (first urging means and second urging means) 23. The first end portion 21b of the lever member 21 is set so as to engage with the stepped portion 16d of the cone 16 in the axial direction at an initial position where the cone 16 becomes the reverse range compatible position. Further, the second end portion 21 c rotates in the rotation direction together with the parking gear 11 when moving from the initial position together with the cone 16 toward the parking range corresponding position (parking pole drive position).

  An engaging portion 21e that protrudes toward the parking gear 11 is formed at the second end portion 21c of the lever member 21. A plurality of engagement step portions (engaged portions) 11b are provided on the side surface of the parking gear 11 at positions corresponding to the engagement portions 21e (see FIG. 5). The engagement step portions 11b are set at equal pitches at positions corresponding to the teeth of the parking gear 11.

  The lever member 21 is supported by the casing 20 of the automatic transmission via a bolt (support shaft) 22, and the coil spring 23 and the lever member 21 are sequentially inserted into the bolt 22 as shown in FIG. 4. Yes. A through hole 21 d for allowing the bolt 22 to be inserted is formed in the center of the lever member 21. The screw portion 22 b of the bolt 22 is screwed into a screw hole 20 a formed at a predetermined position of the casing 20.

  One end of the coil spring 23 is fixed to the bolt head 22 a of the bolt 22, and the other end is fixed to the lever member 21. The coil spring 23 urges the lever member 21 in a direction away from the parking gear 11 (initial position direction), and rotates the lever member 21 in one direction from the engagement position with the cone 16 shown in FIGS. When moved, the first end portion 21b of the lever member 21 is set to return to the original position where it abuts on the stepped portion 16d of the cone 16 by twisting of the spring.

Next, the operation will be described.
[Residual torque release action]
FIGS. 5-8 is a figure which shows a residual torque release effect | action when a select lever is operated from a reverse range to a parking range.

  As shown in FIG. 3, when the select lever is in the reverse range position, the lever member 21 is in the initial position (see FIG. 3) by the biasing force of the coil spring 23, and the engaging portion 21e of the second end 21c. Is separated from the parking gear 11. The first end 21b of the lever member 21 is in contact with the large diameter portion 16a of the cone 16 (FIG. 5).

  When the driver selects the select lever from the reverse range to the parking range, the parking rod 15 and the cone 16 move in the direction corresponding to the parking range corresponding to the manual plate 14. At this time, the lever member 21 is pulled out from the initial position by the first end 21b being pushed by the stepped portion 16d of the cone 16, and until the engaging portion 21e of the second end 21c contacts the side surface of the parking gear 11. Move to the parking range compatible position and stop. Therefore, the cone 16 is in a state in which the movement in the direction in which the parking pole 12 is engaged with the parking gear 11 is restricted, and stops before the parking range corresponding position. Therefore, the parking gear 11 and the parking pole 12 are not engaged.

  Since the parking rod 15 and the cone 16 are connected via a coil spring 18, the parking rod 15 can move in the direction of engaging the parking pole 12 with the parking gear 11 in conjunction with the manual plate 14. The driver's selection operation is not hindered.

  Here, when the torsional torque remains in the power transmission system, the parking gear 11 rotates in the direction of the arrow in FIG. 6 due to the torsional torque. At this time, the engaging step portion 11b of the parking gear 11 comes into contact with the engaging portion 21e of the lever member 21 and pushes down the second end portion 21c. Therefore, the lever member 21 rotates in conjunction with the rotation of the parking gear 11. (FIG. 7).

  When the lever member rotates a predetermined amount, the first end portion 21b is separated from the stepped portion 16d of the cone 16, so that the restriction of the movement of the cone 16 by the lever member 21 is released, and the cone 16 is elastically accumulated in the coil spring 18. The parking pole 12 is moved in a direction to engage the parking gear 11 by force, and the parking pole 12 is pushed up. Thereby, the parking pole 12 and the parking gear 11 mesh, and the output shaft is locked.

  The lever member 21 is separated from the cone 16 and is simultaneously returned to the initial position by the elastic force of the coil spring 23. At this time, the first end portion 21b of the lever member 21 is in contact with the tapered portion 16c of the cone 16 (FIGS. 8 and 9).

In the case where torque Ri twisted in a power transmission system does not remain, since the movement restriction of the cone 16 is not released, the output shaft is not locked, the wheel during stop moves a predetermined angle, in conjunction with the parking gear 11 Then, since the lever member 21 rotates in one direction and the engagement between the lever member 21 and the cone 16 is released, the output shaft can be locked.

[Self-lock prevention action]
When the driver selects the select lever from the parking range to the reverse range, the parking rod 15 and the cone 16 move in a direction to release the engagement between the parking pole 12 and the parking gear 11 in conjunction with the manual plate 14. At this time, since the tapered portion 16c is set at the contact position of the cone 16 with the first end portion 21b, the first end portion 21b biased toward the cone 16 side is large along the tapered portion 16c. Relative movement can be made to an initial position in contact with the diameter portion 16c. Therefore, it is possible to avoid the occurrence of self-locking in which the lever member 21 prevents the cone 16 from moving in the direction in which the parking pole 12 and the parking gear 11 are disengaged.

[Torsion torque remaining in power transmission system]
In a vehicle equipped with an automatic transmission, it is known that torsional torque remains in the power transmission system when the select lever is operated from the reverse range to the parking range. Due to this remaining torsional torque, inconveniences such as shocks and abnormal noises may occur during subsequent restarts.

While the automatic transmission is connected to the engine via a torque converter, torque is constantly input to the automatic transmission during operation of the engine. For this reason, when a driving range such as a drive range or reverse range is selected, power is always input to the automatic transmission even when the drive wheels are locked by a brake device such as a foot brake or parking brake. , torsional deformation occurs from the automatic transmission in a power transmission system leading to the brake device, torsional Ri torque will remain.

  On the other hand, in a vehicle configured to fix the parking gear integrated with the output shaft of the automatic transmission by a lock mechanism and maintain the vehicle in a stopped state, the parking range is selected and adjacent to the parking range. When the select lever is operated from the reverse range to the parking range, power is input to the automatic transmission while the rotation of the output shaft is fixed by the lock mechanism. Therefore, torsional deformation occurs in the engine side of the lock mechanism in the power transmission system, and torsional torque remains.

  If the drive range or reverse range is selected from the parking range while the residual torsion torque is large, the torsion torque remaining in the power transmission system is released by releasing the lock mechanism, so that the torsion torque is It acts suddenly on the side and causes inconveniences such as shock and abnormal noise.

[Parking lock prevention action by corn movement restriction]
In the restricting means 17 of the first embodiment, after the select lever is placed in the parking range, the lever member 21 is engaged with the cone 16 and pulled out from the initial position, and the engaging portion 21e contacts the parking gear 11, Parking lock is prevented. At this time, if the torsional torque remains in the power transmission system, the lever member 21 rotates in conjunction with the rotation of the parking gear 11, so that the movement restriction of the cone 16 is released, and the parking pole 12 and the parking The output shaft is locked by engagement with the gear 11. The lever member 21 returns to the initial position at the same time as the movement restriction of the cone 16 is released.

  That is, when the select lever is selected from the reverse range to the parking range, the lever member 21 restricts the movement of the cone 16 once and immediately returns to the initial position. Therefore, the parking range is selected during traveling, and the parking gear 11 Even if ratcheting occurs without meshing with the parking pole 12, it does not come into contact with the parking gear 11, so there is no deterioration or damage due to wear.

[Case assembling action of regulating means]
In the first embodiment, the coil spring 23 and the lever member 21 are sequentially inserted into the support portion 22, and then the screw portion 22 b of the support portion 22 is screwed with the screw hole 20 a of the casing 20, thereby the lever member 21 and the coil. The spring 23 can be assembled to the casing 20 at the same time. Therefore, it is not necessary to separately assemble the lever member 21 and the coil spring 23 to the casing 20, and the assembly can be easily performed.

Next, the effect will be described.
In the parking device for the automatic transmission according to the first embodiment, the following effects can be obtained.

  (1) In conjunction with the movement of the select lever to the parking range, the parking gear 11 is engaged and the movement of the cone 16 to the parking range compatible position (parking pole driving position) is restricted, and the parking gear 11 is rotated. Accordingly, there is provided restriction means 17 for releasing the movement restriction of the cone 16 and releasing the engagement with the parking gear 11. Therefore, since the torsional torque remaining in the power transmission system can be released, it is possible to reduce noise, shock, and the like when the vehicle restarts after parking. The lever member 21 is supported by the casing 20 of the automatic transmission, and when the parking gear 11 rotates, the engagement with the parking gear 11 is released, so that the parking range is selected during traveling, and the parking gear Even when ratcheting occurs without engaging the parking pole 11 and the parking pole 12, there is no possibility that durability is deteriorated or damaged due to wear.

  (2) The restricting means 17 is formed with a first end 21a for locking the cone 16 and a second end 21b for engaging with the parking gear 11, and swings at an intermediate portion between the both ends 21a and 21b. A lever member 21 is provided which is supported in a movable manner along the moving direction of the cone 16. Therefore, the movement restriction of the cone 16 at the time of parking range selection and the release of the movement restriction of the cone 16 after releasing the torsional torque can be realized with a simple configuration (one swinging lever member 21).

  (3) The second end portion 21b is configured to be engaged with the side surface of the parking gear 11, and an engagement step portion 11b that engages with the second end portion is formed on the side surface of the parking gear. Therefore, the movement restriction of the cone 16 can be reliably released according to the rotation of the parking gear 11 caused by the remaining torsional torque.

  (4) The restricting means 17 includes a coil spring 23 as a first urging means for urging the lever member 21 in a direction away from the parking gear 11 along the moving direction of the cone 16. Therefore, after the movement restriction of the cone 16 is released, the lever member 21 can be immediately returned to the initial position by the elastic force of the coil spring 23, and wear due to contact with the parking gear 11 can be minimized. Further, the lever member 21 can be automatically returned to the position where the parking lock is performed next time.

  (5) The restricting means 17 includes a coil spring 23 as a second urging means that urges the lever member 21 in a direction in which the first end 21 a engages the cone 16. Therefore, at the time of the next parking lock, the movement of the cone 16 can be reliably regulated by the first end portion 21b, and the residual torque can be released.

  (6) The restricting means 17 is mounted on the bolt 22 and the bolt 22 that swingably and slidably supports the lever member 21, and has a spring 23 having the functions of the first urging means and the second urging means. And. Therefore, it is not necessary to separately assemble the coil spring 23 and the lever member 21 to the casing 20, and the assembly can be easily performed. Further, since the coil spring 23 having both functions of the first urging means and the second urging means is provided, the number of parts can be reduced as compared with the configuration in which the first urging means and the second urging means are provided separately. Can reduce costs.

  FIG. 10 is a perspective view of the regulating means 17a of the second embodiment. FIG. 11 is a perspective view of the support portion 24. In the second embodiment, the shape of the support portion 24 that supports the lever member 21 on the casing 20 is the first embodiment. And different.

  The support portion 24 includes a bracket portion 24a and a support shaft portion (support shaft) 24b. A bolt hole 24c for fixing the support portion 24 to a predetermined position of the casing 20 is formed in the bracket portion 24a. A coil spring 23 and a lever member 21 are inserted through the support shaft portion 24b. One end of the coil spring 23 is fixed to the bracket portion 24 a, and the other end is fixed to the lever member 21. The support shaft portion 24 b is accommodated in a recess 20 b formed at a predetermined position of the casing 20.

[Lever member casing assembly operation]
FIG. 12 is a perspective view showing a casing assembling method of the lever member 21. First, the coil spring 23 is inserted into the support shaft portion 24b of the support portion 24, and one end of the coil spring 23 is fixed to the bracket portion 24a. Subsequently, the support shaft portion 24 b is inserted into the through hole 21 d of the lever member 21, and the other end of the coil spring 23 is fixed to the lever member 21. Next, the support shaft portion 24 b of the support portion 24 is inserted into the recess 20 b formed at a predetermined position of the casing 20, and finally, the bracket portion 24 a is bolted to the casing 20.

  That is, after the lever member 21 and the coil spring 23 are assembled to the support portion 22 in advance, the support portion 24 is bolted to the casing 20, so that the coil spring 23 is attached to the casing 20 and then the lever member 21 is attached to the coil spring 23. Compared with the case of attachment, assembly can be performed easily. Further, since the support shaft portion 22b of the support portion 22 is housed in the recess 20b formed in the casing 20, the dead space in the casing 20 can be effectively used to make the device compact.

(Other examples)
The best mode for carrying out the present invention has been described based on the first and second embodiments. However, the specific configuration of the present invention is not limited to each embodiment, and the gist of the invention is as follows. Design changes and the like within a range that does not deviate are also included in the present invention.

FIG. 3 is a diagram illustrating a main part of a hydraulic circuit of the automatic transmission according to the first embodiment. It is a perspective view which shows the parking apparatus of Example 1. FIG. It is a perspective view which shows the detailed structure of the control means of Example 1. FIG. 3 is a perspective view showing a support part of Example 1. It is a figure which shows a residual torque release effect | action. It is a figure which shows a residual torque release effect | action. It is a figure which shows a residual torque release effect | action. It is a figure which shows a residual torque release effect | action. It is a perspective view which shows the state of the parking apparatus at the time of parking lock. It is a perspective view which shows the control means of Example 2. FIG. 6 is a perspective view showing a support part of Example 2. It is a perspective view which shows the casing assembly method of the control means of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil pump 2 Pressure regulator valve 3 Manual valve 3a Drain port 4 Oil path 5 Reverse clutch 6 Oil path 6a One-way valve 6b Orifice 7 Low and reverse brake 8 Oil path 8a One-way valve 8b Orifice 11 Parking gear 11a Tooth groove 11b Engagement Stepped portion 12 Parking pole 12a Claw portion 13 Manual shaft 13a First shaft 14 Manual plate 14a Mountain valley portion 14b Detent spring 14c Detent pin 15 Parking rod 15a Base end portion 15b Tip end portion 16 Cone 16 Parking rod 16a Large diameter portion 16b Tapered portion 16c Taper portion 16d Stepped portions 17 and 17a Restricting means 18 Coil spring 19 Cone support member 20 Casing 20a Screw hole 21 Lever member 21a Second shaft 21b First end portion 21c First End 21d through hole 21e engaging portion 22 supporting portion 22a bolt head 22b threaded portion 22c bolt hole 22b support shaft portion 23 coil spring

Claims (7)

Parking gear,
A parking pole having a pawl portion engageable with the tooth gap of the parking gear;
Interlocking with the movement of the select lever to the parking range, a parking pole driving means for driving the parking pole to an engagement position for engaging the claw portion with the tooth gap;
Restricting means for restricting driving of the parking pole by the parking pole driving means;
Release means for releasing the restriction by the restriction means in conjunction with the rotation of the parking gear ,
The parking pole driving means includes a parking rod coupled to the select lever and movable in the axial direction of the parking pole, a parking pole driving unit attached to be slidable in the axial direction of the parking rod, and one end of the parking rod A spring connected to the other end of the parking pole driving unit and biasing the parking pole driving unit in a direction of driving the parking pole.
The parking device for an automatic transmission, wherein the regulating means is configured to regulate movement of the parking pole driving unit in a direction for driving the parking pole. In the automatic transmission parking device according to claim 1 ,
The regulating means and the releasing means are supported so as to be able to swing an intermediate part of the regulating means and move along the moving direction of the parking pole driving means, and to be engaged with the parking pole driving part. A parking device for an automatic transmission comprising a lever member having a second end portion engageable with the parking gear. In the automatic transmission parking device according to claim 2 ,
The lever member is configured to be moved by the parking pole driving unit to a position where the second end is engaged with the parking gear in a state where the first end is engaged with the parking pole driving unit. A parking device for an automatic transmission. In the automatic transmission parking device according to claim 2 or 3 ,
The second end portion is configured to be engaged with a side surface of the parking gear, and an engaged portion that engages with the second end portion is formed on the parking gear side surface. Automatic transmission parking device. The parking apparatus for an automatic transmission according to any one of claims 2 to 4 ,
A parking device for an automatic transmission, comprising: first urging means for urging the lever member in a direction away from the parking gear along a moving direction of the parking pole driving unit. In the automatic transmission parking device according to claim 5 ,
A parking device for an automatic transmission, comprising: a second urging means for urging the lever member in a direction in which the first end and the parking pole driving unit are engaged. In the automatic transmission parking device according to claim 6 ,
And wherein the lever member is attached to the support shaft and the support shaft for swinging and slidably supported, and a spring having both the functions of the first biasing means and the second biasing means Automatic transmission parking device.

Images