JP2897566B2 - Parking device for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking device for an automatic transmission for a vehicle, and more particularly to an improvement in a torsion spring for urging a parking pawl.

[0002]

2. Description of the Related Art Conventionally, a parking device used in an automatic transmission for a vehicle is a transmission output gear meshed with a large gear of a differential mechanism of the automatic transmission as disclosed in Japanese Patent Application Laid-Open No. 58-20751. Are located on the bottom in the vicinity of. In this case, the parking pawl is locked from the lower part to the higher part, so the torsion spring is urged from the higher part to the bottom part of the parking pawl, and the reaction force element when the pawl engages with the output gear. It is what becomes.

[0003]

However, in the case where the parking pawl is disposed at the high part of the output gear due to the relation with other components, the parking pawl may serve as a reaction force element when the parking pawl is engaged. On the other hand, at the time of release, it plays a role of urging the pole toward the high part and keeping it in the disengaged state.

However, in this case, if the coil spring is wound from the rotation center side of the pole and the tip end is bent to make contact with the lower part of the pole, the distance between the contact part and the rotation center is short. In some cases, the pole may not be properly positioned due to the rotation deviation of the pole.
In order to perform accurate positioning, a method of increasing the spring force is conceivable.However, since the pole is usually assembled last as an assembling procedure, use the empty space of other assembled components, It is necessary to dispose the spring once, and it is desirable that the spring force be as small as possible from the viewpoint of improving the operability when the shift lever operates in the parking range.

Therefore, the present invention reduces the force of the torsion spring as much as possible and shortens the distance from the center of rotation of the pole to bias the pole toward the non-engagement side so as to properly stabilize the pole surface. An object of the present invention is to provide a parking device provided with a torsion spring.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a transmission case 1, a hole 2 formed in the case, and a groove 3 formed perpendicular to the hole. And a pin hole 4, a claw 5, which is inserted into the groove.
A parking pole 7 having a cam contact portion 6 and the hole 2
A pin 8 for rotatably supporting the parking pawl 7 inserted into the groove 3 and inserted into the groove 3.
And one end is locked by the case 1 and the other end extends from the center of rotation of the pole in the axial direction of the pole and is bent perpendicularly to the rotation radius. At least, the torsion spring 10 is formed so as to contact the lower surface 9 of the pawl, and the parking gear 20 is locked from above by the pawl of the pawl. In the extending portion 13 extending to the other end 12, a first bent portion 14 is provided on the winding portion side and a second bent portion 15 is provided on the other end portion, and the second bent portion 15 contacts the lower surface of the pole. It has a structure arranged near the contact part.

[0007]

According to the present invention, since the torsion spring is wound around the center of rotation of the parking pawl 7 and has two bent portions 14 and 15 in its extending portion, the first and second bent portions are provided. Since the interval between the portions and the interval from the second bent portion 15 to the other end portion 12 are short, sufficient durability to stabilize the positioning of the lower surface 9 of the pole against the rigidity of the spring and the engaging force of the pole 7 is achieved. Can be secured.

More specifically, the parking pawl 7 is inserted into the groove 3 in the case. At this time, there is a clearance (gap) (not shown) in the groove. The lower surface is not always stable.

The torsion spring 10 is wound around the pin 8 and the extending portion 13 has first and second bent portions 14 and 1.
5, the distance between the bent portions (14 and 15) and from the second bent portion 15 to the other end 1 is reduced.
The rigidity of the springs up to 2 is improved, and as a result, the springs abutting on the lower surface 9 of the pole are uniformly loaded, so that the pole can be prevented from tilting.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a bottom view of the present invention, and FIG. 2 is a front view of the present invention.

Case 1 covers the entire transmission. The hole 2 is formed in the inner filling portion 1 'of the case 1, and is provided in parallel with the axial direction of the transmission. The groove 3 is formed in the inner filling portion 1 ′ perpendicular to the hole 2. The parking pawl 7 is inserted into the groove 3 and has a claw 5 and a cam contact portion 6. The pin 8 is inserted into the hole 2 and rotatably supports the pole 7. The torsion spring 10 has a winding portion 11 around the pin 8, a first locking portion 10a, an extending portion 13, a first bent portion 14, a second bent portion 15, and the other end portion 12.
The spring between the second bent portion 15 and the other end 12 is brought into contact with the lower surface 9 of the pole. The second bent portion is formed near the contact portion of the pole lower surface 9, and the first bent portion 14 is spaced from the second bent portion so that the position of the spring corresponding to the contact portion with the pole lower surface 9 is stabilized. I have. The pawl 5 is locked to the parking gear 20.

The operation of the present invention will be described below.

When the parking rod 11 is moved to the left in the figure, the cam contact surface 6 is pushed downward while being locked by the stopper pin 12a, and the pawl 5 of the parking pawl 7 is fitted into the parking gear 20. It becomes a parking state.

Conversely, when the parking rod 11 is moved rightward in the figure, the cam 12 is released from the state of contact with the cam contact surface 1, and the parking rod is pushed upward in the figure by the torsion spring 10 and is stopped by the stopper pin 13. Locked.

At this time, since the torsion spring 10 is wound around the center of rotation of the parking pole and has two bent portions 14 and 15 in the extending portion 13, the first and second bent portions 14 and 15 are provided. And the interval from the second bent portion 15 to the other end are short, so that the rigidity of the spring increases and the positioning of the lower surface 9 of the pole with respect to the engagement of the pole 7 is stabilized.

The parking pawl 7 is inserted into the groove 3 in the case, and there is a gap in the groove. Depending on the positioning of the spring for urging the lower surface of the pawl, the pawl is rotated with the rotation of the pawl. The lower surface can be prevented from becoming unstable.

[Brief description of the drawings]

FIG. 1 is a bottom view of a parking device according to the present invention.

FIG. 2 is a front view of the parking device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission case 1 'Inner filling part 2 Hole 3 Groove 4 Pin hole 5 Claw 6 Cam contact part 7 Parking pole 8 Pin 9 Pole lower surface 10 Torsion spring 10a One end of spring 11 Winding part 12 Other end of spring 13 Spring extension part 14 First bent part 15 Second bent part 20 Parking gear

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fumitomo Yokoyama Examiner, Aisin AW Co., Ltd. 10 Takane, Fujii-cho, Anjo-shi, Aichi Pref. Naoya Oku (56) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60T 1/06

Claims (1)

(57) [Claims] A parking pawl having a transmission case, a hole formed in the case, a groove formed perpendicular to the hole, a pin hole inserted into the groove, a claw, and a cam contact portion. A pin for rotatably supporting the parking pole fitted in the hole and inserted in the groove, and wound between the pin and the case, one end of which is locked by the case, and the other end is A torsion spring that extends from the center of rotation of the pole in the axial direction of the pole and is bent perpendicularly to the rotation radius to form a contact with the lower surface of the pole; The other end of the torsion spring is a first bent portion on the winding portion side and the other end portion side in the extending portion from the winding portion to the other end. And a second bent portion, the second is the bent portion parking device for an automatic transmission, characterized in that allowed disposed in abutment portion near the pole bottom surface.