JPH0635678U - Multi-disc clutch - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the splines from being worn by relative rotation in the friction mechanism of the multi-plate clutch. [Structure] The clutch piston 22 has a protrusion 24 facing the friction mechanism 12, and a rubber ring 27 having a wedge-shaped leg 28 on the end face of the protrusion is a ring formed on the end face of the protrusion. The dovetail groove 25 is engaged and attached. The clutch piston contacts the drive plate 9 via the rubber ring and presses the friction mechanism to engage the clutch. At this time, the rubber ring relieves the impact when the clutch is engaged. Since there is no thin plate disc spring that engages with the spline 5 of the clutch drum 1, impact with the spline due to relative rotation does not occur, and no indentation or wear occurs on the spline.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a multi-plate clutch used in a transmission or the like.

[0002]

[Prior art]

 An example of this type of clutch structure used in a transmission is that disclosed in Japanese Utility Model Application Laid-Open No. 2-81928. As shown in FIG. 5, a spline 5 is formed on the inner peripheral surface of a clutch drum 1 as one rotating element, and a plurality of drive plates 9 having teeth engaging with the spline 5 are provided. A spline 7 is formed on the outer peripheral surface of the hub 6 serving as the other rotating element, and a plurality of friction plates 10 having teeth that engage with the spline 7 are provided. The drive plates 9 and the friction plates 10 are alternately arranged in the axial direction to form a friction mechanism 12.

A cylinder 17 is formed in the disk portion of the clutch drum 1, and a clutch piston 2 is provided so as to be movable in the cylinder 17 in the axial direction. At the rear end of the friction mechanism 12, a stopper ring 14 locked to the inner circumference of the clutch drum 1 is in contact with the drive plate 9. A disc spring 13 having teeth that engage with the spline 5 of the clutch drum is provided adjacent to the friction plate 10 at the front end facing the clutch piston 2. The clutch piston 2 has a protrusion 18 facing the friction mechanism 12, and moves when the oil chamber 20 of the cylinder 17 receives hydraulic pressure so that the protrusion 18 presses the friction mechanism 12 via the disc spring 13. To do. At this time, the disc spring 13 absorbs the impact when the clutch is engaged.

[0004]

[Problems to be solved by the device]

 By the way, when the friction mechanism 12 is pressed and the clutch is fastened, the disc spring 13 is pressed against the friction plate 10 and becomes integrated with the friction plate 10 and tries to rotate relatively to the clutch drum 1. However, in the conventional clutch structure as described above, since the disc spring 13 is made of a thin plate material that is relatively flexible for the purpose of shock absorption, the teeth of the disc spring 13 at the time of engagement are the spline 5 of the clutch drum. The spline 5 surface was abraded by impacting the spline. This wear hinders the smooth movement of the disc spring 13 as well as the drive plate 9 in the axial direction, resulting in a problem that a smooth operation of the clutch cannot be obtained. Therefore, in view of the above-mentioned conventional problems, it is an object of the present invention to provide a multi-plate clutch that does not cause wear on a spline due to relative rotation of a friction mechanism portion.

[0005]

[Means for Solving the Problems]

 Therefore, the present invention provides a plurality of first friction members that engage splines formed on the first rotating element and a plurality of second friction members that engage splines formed on the second rotating element. In a multi-plate clutch in which a friction mechanism composed of a material and a clutch piston is pressed to perform clutch engagement, an elastic body is provided at the end of the clutch piston, and the friction mechanism is pressed through the elastic body. To engage the clutch.

[0006]

[Action]

 Since the friction mechanism is pressed through the elastic body, the impact at the time of clutch engagement is mitigated, and because this elastic body is provided on the clutch piston and does not engage with the spline, the spline surface is rotated by relative rotation during engagement. Will not wear out.

[0007]

【Example】

 FIG. 1 shows a first embodiment of the present invention. An axial spline 5 is formed on the inner peripheral surface of the clutch drum 1, and a plurality of drive plates 9 having teeth engaging with the spline 5 are provided. The hub 6 as the other rotating element is formed with an axial spline 7 on its outer peripheral surface, and a plurality of friction plates 10 having teeth engaging with the spline 7 are provided. The drive plates 9 and the friction plates 10 are alternately arranged in the axial direction to form a friction mechanism 12.

A ring-shaped cylinder 17 is formed in the disk portion of the clutch drum 1, and a clutch piston 22 is provided so as to be movable in the cylinder 17 in the axial direction. At the rear end of the friction mechanism 12, a stopper ring 14 is locked to the inner periphery of the clutch drum 1 to prevent the drive plate 9 and the friction plate 10 from coming off, and is in contact with the drive plate 9. The clutch piston 22 has a protrusion 24 facing the friction mechanism 12, and a rubber ring 27 is provided on the end face of the protrusion 24. The rubber ring 27 is attached by engaging a wedge-shaped leg 28 with a ring-shaped dovetail groove 25 formed on the end surface of the protrusion 24. The clutch piston 22 moves when the oil chamber 20 of the cylinder 17 receives hydraulic pressure, and the rubber ring 27 at the tip of the protrusion contacts the drive plate 9 to press the friction mechanism 12. At this time, the rubber ring 27 absorbs the impact when the clutch is engaged.

The rubber ring 27 abuts on the drive plate 9 engaged with the spline 5 of the clutch drum 1, but there is a minute gap between the spline 5 and the teeth of the drive plate 9, and the drive plate 9 is engaged when the clutch is engaged. Even if they rotate relative to each other, they are absorbed by the rubber ring 27. Further, the clutch drum 1 and the clutch piston 22 are originally rotated integrally, but since the clutch piston 22 itself having the rubber ring 27 attached thereto is rotatable with respect to the clutch drum 1, even if there is relative rotation, this causes collision. No strikes will occur. Further, since there is no thin plate disc spring as in the past, no indentation or wear due to it is caused.

FIGS. 2 and 3 show a second embodiment of the invention, in which a disc spring is attached to a clutch piston. The friction mechanism provided between the clutch drum and the hub is the same as in the previous embodiment. The clutch piston 32 has a protrusion 34 facing the friction mechanism 12, and a disc spring 37 is provided on the end surface of the protrusion 34. The disc spring 37 is attached by engaging a plurality of claws 38 formed on the inner peripheral edge of the disc spring 37 at intervals in the circumferential direction with a recess 35 formed on the end face of the projection 34. The clutch piston 32 moves when oil pressure is applied to the oil chamber 20 of the cylinder 17, and the disc spring 37 at the tip of the projection contacts the drive plate 9 to press the friction mechanism 12. At this time, the disc spring 37 bends to reduce the impact when the clutch is engaged.

Also in this embodiment, the disc spring 37 abuts on the drive plate 9 engaged with the spline 5 of the clutch drum 1, but engages with the spline 5 of the clutch drum as in the previous embodiment. Therefore, the impact with the spline 5 due to the relative rotation does not occur. Therefore, no indentation or wear occurs on the spline.

FIG. 4 further shows a third embodiment in which a disc spring is integrated with a clutch piston. That is, a thin flange 47 is formed on the end surface of the projection 44 of the clutch piston 42 facing the friction mechanism 12 and extends obliquely in the outer diameter direction from the inner peripheral edge of the projection 44, and the flange 47 functions as a disc spring. The clutch piston 42 moves when receiving oil pressure in the oil chamber 20 of the cylinder 17, and the tip of the flange 47 extending from the end surface of the protrusion 44 contacts the drive plate 9 to press the friction mechanism 12. At this time, the flange portion 47 bends to reduce the impact when the clutch is engaged. Also in this embodiment, since the flange 47 functioning as a disc spring is not engaged with the spline 5 of the clutch drum, impact with the spline due to relative rotation does not occur, and the spline is not indented or worn. .

[0013]

[Effect of device]

 As described above, according to the present invention, the plurality of friction materials that engage with the splines of the first rotating element and the plurality of friction materials that engage with the splines of the second rotating element are pressed by the clutch piston to engage the clutch. In a multi-disc clutch to be performed, an elastic body is provided at the end of the clutch piston and the friction mechanism is pressed through the elastic body to engage the clutch. Since the elastic body does not engage with the spline, it does not wear the spline surface due to relative rotation during fastening. This ensures a smooth clutch operation for a long period of time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment.

FIG. 3 is a perspective view of a clutch piston according to a second embodiment.

FIG. 4 is a sectional view showing a third embodiment.

FIG. 5 is a diagram showing a conventional example.

[Description of Reference Signs] 1 clutch drum 2 clutch piston 5 spline 6 hub 7 spline 9 drive plate 10 friction plate 12 friction mechanism 13 disc spring 14 stopper ring 17 cylinder 18 protrusion 20 oil chamber 22, 32, 42 clutch piston 24, 34 , 44 Projection 25 Dovetail 27 Rubber ring 28 Leg 35 Recess 37 Disc spring 38 Claw 47 Flange

Claims (3)

[Scope of utility model registration request] 1. A plurality of first friction materials engaging with splines formed on the first rotating element, and a plurality of second friction materials engaging with splines formed on the second rotating element. In a multi-plate clutch that comprises a friction mechanism consisting of a clutch piston and presses the friction mechanism with the clutch piston, an elastic body is provided at an end of the clutch piston, and the friction mechanism is pressed through the elastic body. The multi-disc clutch is characterized in that the clutch is engaged with the clutch. 2. The multi-plate clutch according to claim 1, wherein the elastic body is a rubber ring attached to an end portion of the clutch piston. 3. The multi-plate clutch according to claim 1, wherein the elastic body is a disc spring attached to an end portion of the clutch piston.