JPH0914294A - Clutch piston device - Google Patents

Abstract

PURPOSE: To reduce the circumferential dimension of the spring bearing surface so as to improve the flexural rigidity of a ring piston at this part by arranging piston pawls and springs alternately one by one in a circumferential direction. CONSTITUTION: In a ring piston 14, piston pawls 14b and springs 22 are arranged alternately one by one in a circumferential direction, and one spring bearing surface 14c is provided with only one piston 22. The circumferential dimension of the spring bearing surface 14c is thereby small, and the flexural rigidity of the ring piston 14 at this part is large. Accordingly, even if the ring piston 14 is thin, the ring piston 14 is prevented from being deformed or damaged by bending stress applied to the ring piston at the part of the spring bearing surface 4c by the spring 22. Since a protrusion 14d for supporting the spring 22 is provided in the circumferential center position of the spring bearing surface 14c, bending stress is applied to the center position part, so that flexural rigidity can be further improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch piston device.

[0002]

2. Description of the Related Art As a conventional clutch piston device,
There is one disclosed in Japanese Utility Model Laid-Open No. 60-65429.
That is, what is shown in this is that the piston main body is fitted to either one of the first member and the second member so as to be movable in the axial direction.
A plurality of notches formed in the circumferential direction of the annular spring retainer are formed so as to project in the axial direction at a plurality of positions spaced by a predetermined distance in the circumferential direction of the spring retainer. Clutch presser pawls are provided, and each clutch presser pawl can press the multi-plate clutch by advancing the clutch presser pawls.The spring seat surface formed between the clutch presser pawls adjacent to each other on the piston body and the spring Between the retainer and the retainer, a plurality of springs that constantly bias the piston body in the backward direction are provided at predetermined intervals in the circumferential direction.

[0003]

However, in the conventional clutch piston device as described above, one spring seat surface is provided with a plurality of springs at predetermined intervals in the circumferential direction. Since the circumferential dimension of the surface becomes large, the bending rigidity of the piston body at this portion is small. Therefore, the bending stress applied to the piston body at the spring seat surface by the spring may deform or damage the piston body.To avoid this, the piston body must be thickened. As a result, there is a problem that it is necessary to take a large space for disposing the piston body, and the weight of the clutch piston device increases.
The present invention is to solve such a problem.

[0004]

The present invention solves the above-mentioned problems by arranging one piston claw and one spring alternately in the circumferential direction. That is, in the clutch piston device (10) according to the first aspect of the present invention, the annular piston (14) is fitted to the clutch drum (12) so as to be movable in the axial direction, and the annular piston (14) includes: A plurality of notches (18a) formed in the annular spring retainer (18) at predetermined intervals in the circumferential direction and formed in the annular spring retainer (18) at predetermined intervals in the circumferential direction. Piston claws (14b) are respectively inserted through the piston claws (14b), and the piston claws (14b) can crimp the multi-plate clutch (20) by advancing the piston claws (14b). A spring seat surface (14c) formed between the piston claws (14b) adjacent to each other.
And a spring (22) for constantly biasing the annular piston (14) in the backward direction are provided between the spring retainer (18) and the spring retainer (18). (22) is characterized by being arranged one by one alternately in the circumferential direction. The clutch piston device (10) of the present invention according to claim 2 is capable of supporting one end of the spring (22) at a circumferential center position of the spring seat surface (14c) of the annular piston (14). Naive protrusion (14d)
Are formed so as to project in the axial direction. The reference numerals in the parentheses indicate the corresponding members of the embodiments described later.

[0005]

In the present invention as set forth in claim 1, since the piston pawls 14b and the springs 22 are arranged one by one alternately in the circumferential direction, one spring seat surface 14c has
Since only one spring 22 is provided, the circumferential dimension of the spring seat surface 14c can be reduced, and the bending rigidity of the annular piston 14 in this portion can be increased. Therefore, even if the annular piston 14 is thin, the spring seat surface 14c can be
It is possible to prevent the annular piston 14 from being deformed or damaged due to bending stress applied to the annular piston 14 in a part.
As a result, the space for disposing the annular piston 14 can be reduced, and the weight of the clutch piston device 10 can be reduced. Further, according to the present invention as set forth in claim 2, since the protrusion 14d for supporting one end of the spring 22 is provided at the center position in the circumferential direction of the spring seat surface 14c, the spring 22 is separated from the annular piston
The bending stress applied to the spring seating surface 14c is applied to the central portion in the circumferential direction of the spring seating surface 14c, so that the bending rigidity of the annular piston 14 in the spring seating surface 14c portion can be further improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A clutch piston device 10 embodying the present invention is shown in FIGS. 1, 2, 3 and 4. Clutch drum 1
An annular piston 14 is fitted in the inner diameter portion 2 so as to be movable in the axial direction, and an oil chamber 16 is formed in a portion surrounded by the back surface 14 a of the annular piston 14 and the clutch drum 12. The annular piston 14 is formed with a plurality of notches 18a formed so as to project in the axial direction at a plurality of positions spaced by a predetermined distance in the circumferential direction, and formed in the annular spring retainer 18 by a predetermined distance in the circumferential direction. The piston claws 14b are respectively inserted therethrough. The piston claws 14b can crimp the multi-plate clutch 20 provided on the clutch drum 12 by advancing these piston claws 14b. Adjacent piston pawls 14 of the annular piston 14
Spring seating surfaces 14c are formed between b, and one projection 14d is formed at each center position in the circumferential direction of each spring seating surface 14c. One end of the spring 22 is fitted to the protrusion 14d of each spring seating surface 14c, and the other end of the spring 22 is connected to the spring retainer 18
To the protrusion 18b between the notches 18a adjacent to each other,
A cylindrical connecting portion 18 formed so as to project rightward in FIG.
They are fitted and connected to the outer diameter portion of c.
As a result, the annular piston 14 is constantly urged in the backward direction by the springs 22 which are arranged alternately with the piston claws 14b in the circumferential direction.

Next, the operation of the above embodiment will be described. When pressure oil is supplied to the oil chamber 16, the annular piston 14
Moves forward (moves leftward in FIG. 2) against the elastic force of the spring 22, and the tip of the piston claw 14b moves to the multi-plate clutch 2.
By pressing 0, the multi-plate clutch 20 is crimped. on the other hand,
When the pressure oil is discharged from the oil chamber 16, the spring seat surface 14c of the annular piston 14 is pressed by the elastic force of the spring 22 and moves backward (moves to the right in FIG. 2), and the non-operation shown in FIG. It becomes a state. As a result, the piston claw 14
The tip of b is separated from the multi-plate clutch 20, and the multi-plate clutch 20 is released. As described above, the elastic force of the spring 22 applies a rightward force in FIG. 2 to the spring seat surface 14c of the annular piston 14,
4 is configured such that one piston claw 14b and one spring 22 are alternately arranged in the circumferential direction, and since only one spring 22 is provided on one spring seat surface 14c, the spring seat surface The circumferential dimension of 14c is small, and the bending rigidity of the annular piston 14 in this portion is large. Therefore, even if the annular piston 14 is made thin, deformation and damage of the annular piston 14 due to bending stress applied to the annular piston 14 at the spring seat surface 14c portion by the spring 22 are prevented. Further, since the protrusion 14d for supporting the spring 22 is provided at the circumferential center position of the spring seat surface 14c, the bending stress applied from the spring 22 to the annular piston 14 is the circumferential center position of the spring seat surface 14c. It will be added to the part, the spring seat surface 14c
It is possible to further improve the bending rigidity of the partial annular piston 14. In addition, one spring seat surface 14c
Since the two springs 22 are provided, even if the spring 22 falls down, there is no possibility of interfering with the other springs 22, so that damage to each component can be prevented. Further, since the shapes of the annular piston 14 and the spring retainer 18 are only changed so that the piston claws 14b and the springs 22 are alternately arranged one by one in the circumferential direction, the layout space of the conventional clutch piston device 10 is reduced. The strength of the clutch piston device 10 can be improved without any change.

[0008]

According to the first aspect of the present invention, since the circumferential dimension of the spring seat surface can be reduced and the bending rigidity of the annular piston in this portion can be increased, the annular piston can be made thinner. Also, it is possible to prevent the annular piston from being deformed or damaged due to the bending stress applied to the annular piston at the spring seat surface portion by the spring. Therefore, the space for arranging the annular piston can be reduced, and the weight of the clutch piston device can be reduced. Further, according to the present invention as set forth in claim 2, since the bending stress applied from the spring to the annular piston is applied to the circumferential center portion of the spring seat surface, the bending rigidity of the annular piston is further improved. Can be made.

[Brief description of the drawings]

1 is a view of the clutch piston device taken along line 1-1 in FIG. 2;

FIG. 2 is a front view showing a state where an annular piston, a spring retainer and a spring are assembled.

FIG. 3 is a partial perspective view of FIG.

FIG. 4 is a front view of a spring retainer.

[Explanation of symbols]

 10 Clutch Piston Device 12 Clutch Drum 14 Annular Piston 14b Piston Claw 14c Spring Seating Surface 14d Protrusion 18 Spring Retainer 18a Notch 20 Multi-disc Clutch 22 Spring

Claims (2)

[Claims] 1. An annular piston (14) is fitted onto a clutch drum (12) so as to be movable in the axial direction, and the annular piston (14) has a plurality of circumferentially spaced predetermined intervals. It is formed to protrude in the axial direction at the position,
The annular spring retainer (18) is provided with piston claws (14b) which respectively insert a plurality of notches (18a) formed at predetermined intervals in the circumferential direction, and each of the piston claws (14b) is provided. The multi-plate clutch (20) can be crimped by advancing them, and a spring seat surface (14) formed between the piston claws (14b) adjacent to each other of the annular piston (14).
c) and the spring retainer (18),
A clutch piston device is provided with a spring (22) that constantly urges the annular piston (14) in a backward direction, wherein the piston pawl (14b) and the spring (22) are provided.
Are arranged alternately one by one in the circumferential direction, and the clutch piston device is characterized in that. 2. A protrusion (14d) capable of supporting one end of the spring (22) is formed at an axially central position of the annular bearing surface (14c) of the annular piston (14) so as to project in the axial direction. The clutch piston device according to claim 1, which is provided.