JPH07332415A - Elastic assembly, clutch device, and assembling method of elastic assembly - Google Patents

Abstract

PURPOSE:To reduce parts number by composing a returning elastic assembly which returns a piston to an original position in a clutch device of an automatic transmission of a coil spring which has one end having a coil diameter larger than that of other part, and a spring holding member which has a holder for holding one winding part on one side. CONSTITUTION:A returning elastic assembly 5 which is arranged between an inner periphery of a clutch piston and an input side member of a clutch device is composed of a plurality of clutch springs 11, and a disc-like spring retainer 12 holding one end of each of the springs 11. An end wiring part 11a of the clutch spring 11 at its side held by the retainer 12 has a diameter larger than those of other parts, and is held by a spring holding part 12 formed on the retainer 12. The spring holding part 12a is composed of a cylindrical part 16 projected in one direction around a hole 15, and pushing parts 17 formed at two positions oppositely to the hole 15 in a diameter direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic assembly having a coil spring and a spring holding member for holding one end of the coil spring, a clutch device having the elastic assembly, and a method of manufacturing the elastic assembly.

[0002]

2. Description of the Related Art Conventionally, for example, a clutch device used for an automatic transmission of an automobile is connected to an input side rotating body, an output side rotating body, and both rotating bodies such that they cannot rotate relative to each other and are movable in an axial direction. And a drive plate and a driven plate, a piston for bringing the driven plate and the drive plate into pressure contact with each other, and a return elastic assembly for returning the piston to its original position when the piston has finished the pressure contact. The elastic assembly is
It is provided with a plurality of coil springs and a disc-shaped retainer that supports one end of the coil springs. The inner peripheral end of the disc-shaped retainer is locked to, for example, a clutch drum. One end of the coil spring is locked in the disc retainer so as not to fall off.

The elastic assembly disclosed in Japanese Patent Laid-Open No. 1-307530 is fixed to a retainer, a coil spring in which one winding portion of one end has a larger diameter than the other winding portion, a retainer abutting against the one end of the coil spring. And a cover member that presses the one-turn portion of the coil spring.

[0004]

The above-mentioned conventional elastic assembly requires an annular cover member for connecting the disk-shaped retainer and the coil spring. Therefore, the number of parts of the elastic assembly increases. An object of the present invention is to reduce the number of parts of the elastic assembly.

[0005]

An elastic assembly according to the present invention comprises a coil spring having a coil diameter at one end larger than other coil diameters, and a holding portion for holding one winding portion on one end side of the coil spring. And a spring holding member. The holding portion preferably holds one turn of the coil spring from both the inner and outer circumferences. It is preferable that the holding portion has a cylindrical projection portion that abuts on the inner peripheral side of the one winding portion and a pressing portion that presses the one winding portion from the outer peripheral side. It is preferable that the spring holding member has a disc shape, a plurality of holding portions are formed on the spring holding member, and the coil spring is held by each of the plurality of holding portions.

The clutch device according to the present invention comprises an input side rotating body, an output side rotating body, a drive plate, a driven plate, a piston and an elastic assembly. The drive plate is connected to the input-side rotating body so as not to rotate relative to the input-side rotating body and to be movable in the axial direction. The driven plate is connected to the output-side rotating body such that it cannot rotate relative to the output-side rotating body and is movable in the axial direction, and is adjacent to the drive plate. The piston is movable in the axial direction and presses the driven plate and the drive plate into pressure contact with each other. The elastic assembly biases the piston with the drive plate in a direction away from the pin driven plate, and includes a coil spring and a spring holding member. The coil spring has one end having a larger coil diameter than the other part, and the other end arranged on the piston side. The spring holding member has a holding portion that holds one winding portion on one end side of the coil spring.

The holding portion preferably holds one turn of the coil spring from both the inner and outer circumferences. It is preferable that the holding portion has a cylindrical projection portion that abuts on the inner peripheral side of the one winding portion and a pressing portion that presses the one winding portion from the outer peripheral side. It is preferable that the spring holding member has a disc shape, a plurality of holding portions is formed on the spring holding member, and the coil spring is held by each of the plurality of holding portions.

The method of assembling the elastic assembly according to the present invention comprises a preparation step, a protrusion forming step, a cut and raised portion forming step, an inserting step and a bending step. In the preparation step, a coil spring and a plate member are prepared. In the protrusion forming step, a cylindrical protrusion that protrudes in one direction is formed on the plate member. In the cut and raised portion forming step, the cut and raised portion is formed on the outer peripheral side of the protrusion. In the inserting step, one winding portion on one end side of the coil spring is inserted between the cylindrical protrusion and the cut and raised portion. In the bending step, the cut-and-raised portion is bent, and the outer peripheral side of the coiled portion of the coil spring is pressed.

The coil diameter of one winding portion of the coil spring is preferably larger than the coil diameters of the other winding portions. It is preferable that the protrusion forming step includes a hole forming step of forming a hole in the plate member and a bending step of forming a cylindrical protruding portion around the hole. It is preferable that the cut and raised portion forming step includes a cutting step of forming a cut in the plate member and a raising step of forming the cut and forming the cut and raised portion.

[0010]

In the elastic assembly according to the present invention, the one turn portion of the coil spring is held by the holding portion of the spring holding member. Since the holding portion of the spring member directly holds the coil spring, the conventional cover member is omitted and the number of parts is reduced. When the holding portion holds the one turn portion of the coil spring from both the inner and outer circumferences, the coil spring is less likely to come off the holding portion. When the holding portion has the cylindrical protrusion and the pressing portion, the coil spring is more difficult to come off from the holding portion.

In the clutch device according to the present invention, when the piston moves axially to bring the driven plate and the drive plate into pressure contact, the torque of the input side rotating body is transmitted to the output side rotating body. When the force pushing the piston is released, the elastic assembly returns the piston to its original position. The operation of the elastic assembly is similar to that of the elastic assembly. In the method of assembling the elastic assembly according to the present invention, first, the coil spring and the plate member are prepared in the preparing step. Next, in the protrusion forming step, a cylindrical protrusion protruding in one direction is formed on the plate member. In the cut and raised portion forming step, the cut and raised portion is formed on the outer peripheral side of the protrusion. In the inserting step, one winding portion on one end side of the coil spring is inserted between the tubular protrusion and the cut and raised portion. In the bending step, the cut-and-raised part is bent and the outer peripheral side of the coiled portion of the coil spring is pressed. In this method of assembling the elastic assembly, since the plate member is directly processed to hold the one winding portion on one end side of the coil spring, the conventional cover member is unnecessary and the number of parts is reduced. Furthermore, since the inner circumferential side of the one turn portion of the coil spring is supported by the cylindrical protrusion and the outer circumferential side is pressed by the cut and raised portion,
The coil spring is hard to come off from the plate member. When the coil diameter of one coil portion of the coil spring is larger than the coil diameter of the other coil portion, the coil spring is stable during assembly, and as a result, distortion after assembly is reduced. When the projecting portion forming step includes the hole forming step and the bending step, the holding portion can be formed by simple processing. When the cut-and-raised portion forming step includes the cut-in step and the raising step, the holding portion can be formed by a simple working formation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A clutch 1 shown in FIG. 1 is used in an automatic transmission of an automobile. Here, O-O is the center axis of rotation of the clutch 1. The clutch 1 is mainly composed of a clutch drum 2, a clutch portion 3, a clutch piston 4, a return elastic assembly 5, and an input side member 7. The clutch drum 2 is a tubular member. Yes, the inner cylinder 2a and the outer cylinder 2b
It consists of and. The inner cylindrical portion 2 a is arranged around the intermediate shaft 6. Outer tube part b
A spline groove 2c is formed on the lower inside of the figure.

The clutch portion 3 is composed of a plurality of drive plates 8, a driven plate 9 and a dish plate 10. The drive plates 8 and the driven plates 9 are ring-shaped and are alternately arranged. The clutch drum 2 is provided at the inner peripheral end of the driven plate 9.
Spline teeth that fit into the spline groove 2c are formed. As a result, the driven plate 9 is non-rotatable relative to the outer cylinder 2b of the clutch drum 2 and movable in the axial direction. On the other hand, the input side member 7 has a cylindrical portion 7a extending upward in the drawing, and a spline groove 7b is formed on the outer periphery of the cylindrical portion 7a. Spline teeth that fit into the spline grooves 7 b of the input side member 7 are formed on the inner periphery of the drive plate 8. This allows
The drive plate 8 is non-rotatable relative to the input side member 7 and movable in the axial direction. The dish plate 10 is arranged above the drive plate 8 and the driven plate 9 in FIG. The dished plate 10 has a dish shape and absorbs shock when the clutch is engaged.

The clutch piston 4 is an aluminum annular member, and is disposed inside the clutch drum 2 on the inner side (upper side in FIG. 1) of the clutch portion 3. The inner and outer circumferences of the clutch piston 4 are in contact with the inner tubular portion 2a and the outer tubular portion 2b of the clutch drum 2, respectively. Further, seal rings 20 are arranged at the abutting portions, respectively. In addition,
An operating hydraulic pressure from another hydraulic device (not shown) can be sent to the upper side of the clutch piston 4 in the drawing. On the outer circumference of the clutch piston 4, a pressing portion 4a that can contact the dish plate 10 is formed.

A return elastic assembly 5 is arranged between the inner peripheral portion of the clutch piston 4 and the input side member 7. The return elastic assembly 5 is composed of a plurality (eight in this embodiment) of clutch springs 11 and a disk-shaped spring retainer 12 that holds one end of the plurality of clutch springs 11. Each clutch spring 11 is a coil spring that extends spirally, one end of which is held by the spring retainer 12 and the other end of which is arranged on the clutch piston 4 side. The end winding portion 11a of the clutch spring 11 on the side held by the spring retainer 12.
2, the coil diameter is larger than the coil diameters of the other winding portions.

As shown in FIG. 4, the spring retainer 12 is formed with eight spring holding portions 12a. 4 is a plan view of the spring retainer 12 before the clutch spring 11 is attached. Figure 2
As shown in, each spring holding portion 12a has a circular hole 15. A cylindrical portion 16 is formed around the hole 15 so as to project in one direction. The inner peripheral part of the end winding part 11 a of the clutch spring 11 is in contact with the outer peripheral side of the tubular part 16. Further, there are holding portions 17 formed by being cut and raised at two locations facing each hole 15 in the radial direction. The holding portion 17 is in contact with the upper portion on the outer peripheral side of the end winding portion 11a of the clutch spring 11. As described above, the end winding portion 11 a of the clutch spring 11 includes the tubular portion 16 and the pressing portion 1.
It is held from both inside and outside by 7
Since it is also pressed from the upper side by 7, it is difficult for it to come off from the spring holding portion 12a.

Next, a method of assembling the return elastic assembly 5 will be described. First, the clutch spring 11
A disk-shaped plate member (12) is prepared. Then, holes 15 are formed in a plurality of portions where the spring holding portions 12a are to be formed by punching. As is clear from FIG. 5, the holes 15 are substantially circular and are opposed to each other in the radial direction.
A cutout portion 15a that is further cut out on the outer peripheral side is provided at the location. Next, the notches 18 are formed on both sides of the notch 15a in the outward direction. Then, the cylindrical portion 16 is formed on the edge of each hole 15 by burring. Further, as shown in FIG. 8, the pressing portion 17 is formed by raising the portion where the notch 18 is formed. At this time, the pressing portion 17 stands upright from the plate member (12). As a result, the spring retainer 12 before the clutch spring 11 is assembled, as shown in FIGS. 4 and 8, is completed.

Subsequently, as shown in FIG. 9, the end winding portion 11a of each clutch spring 11 is fitted onto the outer periphery of the cylindrical portion 16. As a result, the clutch spring 11 is positioned. Since the coil diameter of the end winding portion 11a is larger than the coil diameters of the other winding portions, the posture of the clutch spring 11 is stable. The pressing portion 17 cut and raised from the state shown in FIG. 9 is bent and brought into contact with the outer peripheral side upper portion of the end winding portion 11a of the clutch spring 11. As a result, the assembly is completed as shown in FIG.

In the elastic assembly 5 for return and the assembling method thereof as described above, the spring retainer 12 is used.
Since it directly holds the clutch spring 11, the conventional cover member is omitted. As a result, the number of parts is reduced. Further, since the pressing portion 17 is in contact with the upper portion on the outer peripheral side of the end winding portion 11a of the clutch spring 11, the clutch spring 11 is unlikely to come off from the spring holding portion 12a of the spring retainer 12. Further, since the end winding portion 11a of the clutch spring 11 is positioned by the tubular portion 16 during the assembling, the clutch spring 11 is accurately positioned.
Further, since the end winding portion 11a of the clutch spring 11 has a larger diameter than the other winding portions, the posture of the clutch spring 11 at the time of assembling is stable, and the clutch spring 11 is assembled in an accurate posture. Further, since the end winding portion 11a of the clutch spring 11 has a larger diameter than the other winding portions, the bending operation of the pressing portion 17 is facilitated.

Next, the operation of the clutch 1 will be described. When an operating oil pressure is sent from the hydraulic operating device (not shown) into the clutch drum 2, the clutch piston 4 moves to the position shown in FIG.
And the drive plate 8 and the driven plate 9 are pressure-bonded to each other. Then, the torque of the input side member 7 is transmitted to the clutch drum 2 and further transmitted to the output side member (not shown).

When the hydraulic pressure in the clutch drum 2 is released by a hydraulic actuator (not shown), the elastic force of the clutch spring 11 returns the clutch piston 4 to the upper position in FIG. As a result, the pressure contact between the drive plate 8 and the driven plate 9 is released, and the power transmission is cut off.
At the time of the above operation, the clutch spring 11 is accurately positioned with respect to the spring retainer 12 and has a straight posture, so that a uniform pressing force is applied to the clutch piston 4 in the circumferential direction.

[0022]

In the elastic assembly according to the present invention, the one winding portion of the coil spring is held by the holding portion of the spring holding member. Since the holding portion of the spring member directly holds the coil spring, the conventional cover member is omitted and the number of parts is reduced. When the holding portion holds one turn of the coil spring from both the inner and outer circumferences, the coil spring is less likely to come off the holding. When the holding portion has the cylindrical protrusion and the pressing portion, the coil spring is more difficult to come off from the holding portion.

In the clutch device according to the present invention, when the piston moves in the axial direction to bring the driven plate and the drive plate to the end, the torque of the input side rotating body is transmitted to the output side rotating body. When the force that biases the piston is removed, the elastic assembly returns the piston to its original position. The operation of the elastic assembly is similar to that of the elastic assembly. In the method of assembling the elastic assembly according to the present invention, since the plate member is directly processed to hold one winding portion on one end side of the coil spring,
The conventional cover member is unnecessary and the number of parts is reduced. Further, since the inner circumferential side of the one turn portion of the coil spring is supported by the cylindrical protrusion and the outer circumferential side is pressed by the cut-and-raised portion, the coil spring is hard to come off from the plate member.

When the coil diameter of one coil portion of the coil spring is larger than the coil diameter of the other coil portion, the coil spring is stable at the time of assembling, and as a result, distortion after assembling is reduced.
When the projecting portion forming step includes the hole forming step and the bending step, the holding portion can be formed by simple processing. When the cut-and-raised portion forming step includes a cutting step,
The holding portion can be formed by simple processing.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a clutch according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a view on arrow III in FIG.

FIG. 4 is a plan view of a clutch retainer.

FIG. 5 is a view showing a state in the assembly of the return elastic assembly.

FIG. 6 is a view showing a state in the assembly of a return elastic assembly.

FIG. 7 is a view showing a state in the assembly of the return elastic assembly.

FIG. 8 is a diagram showing a state in the assembly of the elastic assembly for return.

FIG. 9 is a view showing a state in the assembly of the return elastic assembly.

[Explanation of symbols]

 1 Clutch 2 Clutch Drum 3 Clutch Part 4 Clutch Piston 5 Elastic Assembly for Return 7 Input Side Member 11 Clutch Spring 11a End Winding Part 12 Spring Retainer 12a Spring Holding Part 15 Hole 16 Cylindrical Part 17 Pressing Part 18 Notch Part

Claims (12)

[Claims] 1. An elastic set comprising: a coil spring having a coil diameter at one end larger than a coil diameter at the other portion; and a spring holding member having a holding portion for holding one winding portion of the coil spring on the one end side. Three-dimensional. 2. The elastic assembly according to claim 1, wherein the holding portion holds the one winding portion of the coil spring from both inner and outer circumferences. 3. The holding portion has a cylindrical projection portion that abuts on an inner peripheral side of the one winding portion and a pressing portion that presses the one winding portion from an outer peripheral side. The elastic assembly according to. 4. The spring holding member has a disc shape, a plurality of the holding portions are formed on the spring holding member, and the coil springs are held by the plurality of holding portions, respectively. 4. The elastic assembly according to any one of 3 to 3. 5. An input side rotating body, an output side rotating body, a drive plate connected to the input side rotating body such that the input side rotating body is relatively non-rotatable and axially movable, and an output side rotating body is relatively non-rotatable. And a driven plate adjacent to the drive plate and movably in the axial direction, and a piston that is movable in the axial direction and presses the driven plate and the drive plate into contact with each other. A coil spring in which the coil diameter at one end is larger than the coil diameter at the other portion and the other end is arranged on the piston side, and one turn of the coil spring at the one end side. An elastic assembly including a spring holding member having a holding portion that holds the portion. 6. The clutch device according to claim 5, wherein the holding portion holds the one winding portion of the coil spring from both inner and outer circumferences. 7. The holding portion has a cylindrical projection portion that abuts on the inner peripheral side of the one winding portion, and a holding portion that presses the one winding portion from the outer peripheral side. The clutch device according to 1. 8. The spring holding member has a disc shape, a plurality of the holding portions are formed on the spring holding member, and the coil springs are held by the plurality of holding portions, respectively. The clutch device according to any one of 5 to 7. 9. A preparatory step of preparing a coil spring and a plate member, a projection forming step of forming a cylindrical projection protruding in one direction on the plate member, and a cut-and-raised portion on the outer peripheral side of the projection. Forming a cut-and-raised part, an insertion step of inserting one winding part of the coil spring between the tubular protrusion and the cut-and-raised part, bending the cut-and-raised part to form the coil spring. A method of manufacturing an elastic assembly, comprising: a bending step of pressing the outer peripheral side of the one winding portion. 10. The method for manufacturing an elastic assembly according to claim 9, wherein the coil diameter of the one winding portion of the coil spring is larger than the coil diameters of the other winding portions. 11. The projecting portion forming step includes a boring step of boring a hole in the plate member, and a bending step of forming the tubular projecting portion around the hole.
0. The method for manufacturing the elastic assembly according to item 0. 12. The cut and raised portion forming step includes a cut step of forming a cut in the plate member and a raising step of raising the cut to form a cut and raised portion. The method for manufacturing the elastic assembly according to any one of claims.