JPH0332428A - Method and device for manufacture clutch cover assembly - Google Patents

Abstract

PURPOSE:To prevent a supporting point ring from being deformed in the radial direction and in the upper direction at the time of bending the tip of a tab by pressing and supporting the outside peripheral end and the upper end of the supporting point ring at the time of manufacturing a clutch cover assembly. CONSTITUTION:In a state that a diaphragm spring 5 and supporting rings 6, 7 are assembled, a clutch cover body 1a is placed on the lower die 11 and the upper die 13 is allowed to descend. Subsequently, when the upper die 13 reaches the maximum descent position, a second supporting part 22 presses and supports the upper end of the upper side supporting point ring 7 from the roughly vertical upper part, and also, a first supporting part 21 presses and supports the outside peripheral end of the upper side supporting point ring 7 from the radial direction. Accordingly, flexural deformation in the radial direction and in the upper direction of the supporting pint ring 7 at the time of bending the tip part of a tab 8 is prevented. Therefore, a close state is formed between the supporting point ring 7 and the tab 8, an operation of a clutch mechanism is obtained stably and surely, and also, the durability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application: Industry, F. The present invention relates to a method and apparatus for manufacturing a clutch cover assembly for a diaphragm spring type clutch device used in automobiles and the like.

As is well known in the art, a diaphragm spring type clutch device has a structure in which the diaphragm spring for biasing the pressure plate is supported via a fulcrum ring by bending the tab of the clutch cover without using rivets. It has been known.

And to manufacture such a clutch cover assembly,
For example, as in the technique described in Japanese Patent Publication No. 61-59404, a clutch cover body is supported from below by a lower mold with a diaphragm spring and a fulcrum ring attached, and the clutch cover body is supported from below by a lower die. The tab protruding from the bottom of the press is supported from the radial direction by the tab support part of the lower die of the press, and the outer circumferential end of the upper fulcrum ring is supported by the support part provided in the form of a single line, and the tab is then The tip of the tab is bent outward to support the diaphragm spring on the clutch cover body via a pair of fulcrum rings.

Problems to be Solved by the Invention However, in the conventional method and apparatus for manufacturing a clutch cover assembly, as described above, the upper fulcrum ring has its outer peripheral end supported by the support part provided on the upper die. However, since the upper end of the fulcrum ring is not supported in any way, it is possible to prevent the fulcrum ring from deforming outward in the radial direction when the tab tip is bent.
It is not possible to prevent IE from bending deformation in the direction due to outward tensile loads, etc. Therefore, a gap is likely to occur particularly between the fulcrum ring and the bent portion of the tab, and the fulcrum ring becomes loose, making it impossible to obtain a reliable support state. As a result, there are problems such as unstable operation of the clutch mechanism and decreased durability.

Means for Solving the Problems The present invention has been devised in view of the above-mentioned conventional problems, and involves inserting a plurality of tabs provided on the inner periphery of the clutch cover body into notched holes in the diaphragm spring. At the same time, the tip of the tab is bent while supporting a pair of fulcrum rings disposed on both sides of the diaphragm spring, thereby forming a clutch cover assembly in which the diaphragm spring is supported on the clutch cover body via the fulcrum rings. In the three-dimensional manufacturing method, the clutch cover body with the diaphragm spring and fulcrum ring assembled is supported by a lower mold, and the tab tip portion protruding upward from the notch hole is folded radially outward by the upper mold. a) When the fulcrum ring is rotated, the outer peripheral end of the fulcrum ring is pressed and supported radially inward by the first support part, and the upper end of the fulcrum ring is pressed and supported from approximately vertically above by the second support part. .

In addition, in the apparatus for manufacturing a latch cover assembly as described above, while supporting the clamp, which is assembled with the diaphragm spring and the fulcrum ring, with a lower die, when bending the tip of the tab, the fulcrum ring is a first support portion that presses and supports the outer peripheral end of the
A second support ring that presses and supports one upper end of the fulcrum ring from approximately vertically above.
It is characterized in that it is provided with a support portion.

According to the present invention having the above-mentioned structure, the fulcrum ring is the first
Since its outer peripheral end is pressed and supported by the support part and its upper end by the second support part, bending deformation of the fulcrum ring outward in the radial direction and in the -L direction when the tab is bent is reliably prevented. .

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, the outline of the three-dimensional structure of the clutch cover 1 will be explained based on FIG. 2. It covers from
Further, the outer peripheral portion of an annular diaphragm spring 5 is in contact with the rear projection 4a of the pressure plate 4. A pair of fulcrum rings 6.7 constituting fulcrums of the diaphragm spring 5 are in contact with both side surfaces of the diaphragm spring 5 near the outer periphery. This fulcrum ring 6
．． 7 is supported by the tab 8 of the clutch cover l from the inner peripheral side and the opposite side to the diaphragm spring 5.

A release bearing 9 is disposed on the inner circumference of the diaphragm spring 5 and faces the pressure plate 4 on the opposite side.

A plurality of the tabs 8 are provided on the inner peripheral edge of the annular main body 1a of the clutch cover 1 at predetermined intervals in the circumferential direction,
It extends to the pressure plate 4 side by passing through notch holes 5a formed corresponding to the diaphragm springs 5. Further, the tip portion 8b of the tab 8 is bent substantially radially outward, and the fulcrum ring 6.7 is held between the tab 8 and the diaphragm spring 5 in a pinched state.

The material for the clutch cover 1 is then sent to the bending process shown in FIG. 1 through a blanking process, restriking process, etc. To be more specific, numeral 11 is a lower mold that is placed and fixed on a base 121, and 13 is an upper mold that is fixed to the lower surface of a support 14 and is driven up and down by a hydraulic drive device (not shown). The clutch cover 1 is placed on the lower mold ll with the tab body 8a protruding toward the L direction, and
The diaphragm spring 5 is placed substantially horizontally with the tab tip 8b inserted into the notch hole 5a. Also,
A fulcrum ring 6.7 is arranged on both sides of the outer circumferential side of the diaphragm spring 5.

Furthermore, the tab main body 8a at the initial stage of the bending process is bent at a substantially right angle to the clutch cover main body 1a, as shown by the two-dot chain line.

That is, the lower mold 11 has a worksheet 1 in the center of the upper part.
5, and an annular work support portion 24 on the outer periphery of the work sheet 15. The work sheet 1-15 supports the lower surface of the inner peripheral side of the diaphragm spring 5 from below with its flat upper surface. are doing. Further, the work support part 24 supports the lower surface of the outer circumferential side of the diaphragm spring 5 from below on its upper surface, supports the inner circumferential portion of the clutch cover main body 1a from below at the stepped portion 24a on the upper outer circumference, and supports the tab main body. 8a from inside in the radial direction. Furthermore, a base 12 is provided at the outer peripheral end of the lower mold 11.
A positioning pin 16 is mounted and fixed at the positioning pin 16, and the tip 16a of this positioning pin 16 pushes through a hole at the outer peripheral end of the clutch cover 1 to position the clutch cover 1 in the rotational direction. ing.

The upper mold 13 is provided with a substantially annular spring support part 17 on the outer peripheral side that presses and supports the outer peripheral end of the diaphragm spring 5 from the vertical -L direction to flatten it, and also has the tab tip part 8b as shown in the solid line. It is provided with a punch 18 having a tapered tip and serving as a pressing portion that is bent into a substantially doglegged shape. This punch 18 is provided so as to be movable up and down with respect to the die 13 via a regulating member 20 and a cylindrical guide portion 25, which will be described later, by a predetermined drive mechanism. Moreover, - a cylindrical regulating member 20 is provided at the center of the upper mold 13 and abuts against a cylindrical stopper 19 provided at the center of the lower mold 11 to restrict the maximum downward movement position of the upper mold 13;
is provided.

Further, the upper mold 13 has a first support portion 2 on the outside of the punch 18.
1 is arranged, and the spring support part 17
A second support portion 22 is arranged on the inner peripheral side. Said first
The support part 21 is provided so as to be movable in the radial direction of the upper die 13 via a ring cam 23 provided on the lower surface of the outer peripheral side of the support body 14, and has a tip part 21a bent in a substantially dogleg shape to support the upper fulcrum ring 7. The outer peripheral end is pressed and supported from the outside in the radial direction. On the other hand, the second support part 22 has a substantially cylindrical shape, and is adapted to press and support the upper end of the -L upper fulcrum ring 7 from the upper direction of the vehicle with its lower surface 22a, and its axial height dimension is as described above. When the regulating member 20 abuts the stopper 19 and the upper die 13 is at its maximum downward movement position, the fulcrum ring 7 is set to come into light contact with the surface of the diaphragm spring 5h.

Therefore, according to this embodiment, when the upper mold 13 is lowered until the regulating member 20 comes into contact with the stopper 19 with the clutch cover 1 etc. placed on the lower mold 11 as shown in the figure, the maximum Spring support part 1 from near the lowering position
7 moderately presses the outer peripheral end of the diaphragm spring 5 to flatten it.

When the upper mold 13 reaches the maximum lowered position, the second support part 22 presses one end of the upper support ring 7 and supports the upper surface of the diaphragm spring 5 with pressure. At the same time, the first support part 21 presses and supports the outer circumferential edge of the -L upper fulcrum ring 7 from the radially outward direction at the tip 21a. Thereafter, the punch 18 further descends and bends the tab tip 8b into a substantially dogleg shape as shown in the figure along its tapered surface. When bending the tab tip 8b, the outer periphery of the upper fulcrum ring 7 is reliably supported by the first support part 21 as well as the upper end by the second support part 22 as described above, so that the fulcrum Flexural deformation of the ring 7 in the radial direction and in the upward direction are prevented. Therefore, each fulcrum ring 6.7 has tab body 8 a + tab tip 8
b and the diaphragm spring 5, it is firmly and reliably held without any gaps.

Furthermore, the diaphragm spring 5 is shown in worksheet 15.
and is supported from below by the workpiece support part 24, and its outer peripheral upper surface is supported in a pinched state by the spring support part 17 and the tip part 21a of the first support part 21, so that displacement of the device in the radial direction is prevented. It will be LL. Furthermore, since the lower half of the tab body 8a is reliably supported by the stepped portion 24a of the workpiece support portion 24 from the side opposite to the lower fulcrum ring 6, displacement of the tab body 8a in the radial direction is also prevented. .

The present invention is not limited to the above-mentioned embodiment, and it is also possible to change the support structure of the tab body 8a, etc.

Effects of the Invention As is clear from the explanation in Section L, according to the present invention, the outer peripheral end of the fulcrum ring is pressed and supported from the outside in the radial direction by the first support part, and the outer peripheral end of the fulcrum ring is supported by the second support part. Since the upper end is compressed and supported from approximately vertically above, the fulcrum ring is reliably prevented from being bent radially outward and upward when the tab tip end is bent. Therefore, the fulcrum ring and the vicinity of the tab folding portion are in close contact with each other, thereby preventing the occurrence of gaps, backlash, etc. As a result, stable and reliable operation of the clutch mechanism is obtained, and durability is improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a device used in an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a clutch cover assembly. ■... Clutch cover 1a... Clutch cover body, 5... Diaphragm spring, 5a... Notch hole, 6.7... Fulcrum ring, 8... Tab, 8b...
・Tab tip, 11...lower mold, 13...E type, 18
... Punch (pressing part), 21... First support part, 22
...Second support part. 3 people outside Figure 2

Claims (2)

[Claims] (1) Insert the plurality of tabs provided on the inner periphery of the clutch cover body into the notch holes in the diaphragm spring, and insert the tips of the tabs into the pair of fulcrum rings placed on both sides of the diaphragm spring. In the method of manufacturing a clutch cover assembly in which a diaphragm spring is supported by a fulcrum ring on the clutch cover body by bending the clutch cover body while holding the diaphragm spring, the clutch cover body is molded into a lower mold with the diaphragm spring and fulcrum ring assembled. At the same time, when the tab tip protruding upward from the notch hole is bent radially outward with an upper mold, the outer peripheral end of the fulcrum ring is pressed and supported radially inward by the first support part. The method for manufacturing a clutch cover assembly is further characterized in that the upper end of the fulcrum ring is press-supported from substantially vertically above by the second support portion. (2) Insert the plurality of tabs provided on the inner periphery of the clutch cover body into the notch holes in the diaphragm spring, and insert the tips of the tabs into the pair of fulcrum rings placed on both sides of the diaphragm spring. In an apparatus for manufacturing a clutch cover assembly in which a diaphragm is supported by a fulcrum ring on the clutch cover body by being bent while being held, the clutch cover to which the diaphragm spring and fulcrum ring are assembled is supported by a lower mold. On the other hand, when bending the tab tip, a first support part presses and supports the outer peripheral end of the fulcrum ring radially inward, and a second support part presses and supports the upper end of the fulcrum ring from approximately vertically above. A manufacturing device for a clutch cover assembly, characterized in that each is provided with a clutch cover assembly.