JPS5912892B2 - Method for manufacturing a cover assembly for an automobile clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a cover assembly for an automobile clutch.

More particularly, the present invention relates to a method of manufacturing a cover assembly including a fulcrum member disposed in contact with a diaphragm from both sides.

In other words, this type of clutch generally has a primary plate, which is a reaction plate or flywheel, which is rotatably fixed on the primary shaft that constitutes the drive shaft, and a secondary plate that is generally fixed to the secondary shaft that constitutes the driven shaft. an axially movable latch plate supported by the reaction plate to allow the clutch plate to move axially relative to the reaction plate for engaging and disengaging the clutch between the sheet piles; The assembly is composed of a secondary side plate that constitutes a pressing plate, and a cover assembly, and the assembly includes a cover whose outer periphery is held by the reaction plate outside the clutch plate and the pressing plate, and a cover that is attached to the cover. The diaphragm is attached to the cover so as to be movable back and forth using a small circular cylinder, and this diaphragm is attached from both sides via, for example, a flange-like fulcrum member, and the diaphragm exerts a pressing action on the pressing plate. It consists of a peripheral part forming a Belleville-type elastic thin plate for disengaging the clutch, and a central part dividing this peripheral part in the radial direction for disengaging the clutch.

Generally, this fulcrum member is a ring constituted by a large-diameter annular body with a circular cross section, and this ring is maintained in contact with the diaphragm by a small cylinder.
Its role is to securely attach the diaphragm to the cover.

Therefore, although the assembly of the cover, this ring, and the diaphragm is relatively strong so as to hold the ring accurately against the small cylinder, the quality of the ring sandwiched in between may deteriorate and and/or prone to play leading to irregular and uncertain fulcrum conditions that reduce life and increase diaphragm fatigue.

Additionally, these two rings in combination with a single diaphragm may be eccentric from one side to the other, from one side of the diaphragm to the other, resulting in supplementary restraint of the diaphragm as the diaphragm moves back and forth.

These types of rings themselves have a structure that is relatively easy to break, and if these rings suddenly break, the clutch to which they are attached will become unusable unless repaired, and the rings will have to be replaced.

□Instead of the above-mentioned ring, it has also been proposed to arrange at least one ring between the cover and the diaphragm by means of an annular projection formed on the cover;
It is impossible to form such a protrusion in a case where the cover is quite thick, such as a clutch for a heavy vehicle.

Furthermore, it is difficult to provide a desired level of smoothness on the fulcrum formed by such a protrusion.

It has also been proposed that instead of the above-mentioned ring, a fulcrum member, which generally has a circular outer shape, may be divided into flower ring-shaped segments and used.

However, it is known that in this known type, it is necessary to allow for a certain degree of elasticity when the cover, diaphragm and support members on both sides are assembled together.

That is, with this combination, it is impossible to firmly tighten the diaphragm, and as a result, residual stress and hysteresis are generated in the diaphragm when the clutch is released.

In order to provide the above-mentioned elasticity, either the cross-sectional shape of the fulcrum member itself has a large elastic characteristic, or another elastic means is combined with the fulcrum member.

However, making the support member from a material that possesses good elastic properties can be expensive and complex.

The present invention has been made in view of the above problems.

It is based on the opposite viewpoint to the generally known idea, and the fulcrum member has a sufficient deformation capacity so that the fulcrum member does not have to apply a particularly large tightening force to the diaphragm during installation.
That is, an object of the present invention is to provide a method of manufacturing a cover assembly for an automobile clutch that uses a fulcrum member that does not have elasticity.

Another object of the present invention is to provide a method of manufacturing a cover assembly for an automobile clutch in which manufacturing errors in the fulcrum member are automatically absorbed.

A further object of the present invention is to provide a method of manufacturing a cover assembly for an automobile clutch in which the diaphragm is supported by the fulcrum member without any play, thereby reducing wear on the fulcrum member and related mechanisms.

In order to achieve the above object, the present invention has the following structural features.

That is, the present invention includes a cover fixed to a reaction plate of a flywheel, and a diaphragm mounted on the cover so as to be swingable about the fulcrum member by a small cylinder via fulcrum members on each side of the diaphragm. , said diaphragm has a Bellevue-type washer-like periphery which acts on the pressure plate to force the clutch plate towards the reaction plate or flywheel, and said diaphragm transfers the force applied to the suppression plate to the diaphragm. A method of manufacturing a cover assembly for an automobile clutch having a central portion divided into radial fingers for release by a peripheral portion, wherein at least one of the fulcrum members is made of a material with low elasticity, such as mild steel. a member, the fulcrum member comprising:
A hole for the small cylinder, a flat part formed around the hole to be supported by the shoulder of the small cylinder, and an arch-shaped rib raised from the flat part to be supported by the diaphragm. When the flat part is fixed to the small cylinder, the fulcrum member undergoes permanent deformation at the bow-shaped lip, and the force required to deform the fulcrum member is the maximum force required to disengage the clutch. configured to be greater than the force.

The above objects, features and advantages of the invention will become apparent from the following description, by way of example, with reference to the accompanying conceptual drawings.

The clutch cover assembly of the present invention, which is shown as an embodiment in the accompanying drawings, includes a cover 10 whose outer periphery 11 is attached to a reaction plate or flywheel (not shown). A hole 12 is provided for mounting.

A plurality of small cylinders 13 are attached to the center of the cover 10 in an annular manner, and a diaphragm 14 moves back and forth with respect to the cover via a member 15 with a circular outer shape constituting a fulcrum member on both sides. It is attached to this small cylindrical column 13 like this.

Both ends of the central body 16 formed in each small cylinder 13 terminate at two shoulders 17, on which the fulcrum member 15 is supported, and from both shoulders 17 An end 18 of reduced diameter projects.

One end portion 18 passes through the fulcrum member 15 and the cover 10 through a hole 20 formed in the fulcrum member 15 and a hole 21 formed in the cover 10, and is locked with a rivet 22 on the outside of the cover. There is.

The other end 18 of the small cylinder 13 is the other fulcrum member 15
It passes through this fulcrum member through a hole 20 formed in the fulcrum member 15, and is locked onto the fulcrum member 15 by a rivet 24 on the outside thereof.

The diaphragm 14 includes a Belleville type trailing plate for applying a tightening action to a pressing plate (not shown) suitable for pressing a clutch disk (not shown) against the reaction plate combined therewith. A hole 26 is formed in the peripheral portion 25 to engage with the small cylindrical column 13 with play.

The diaphragm 14 further has a central portion 28 divided into radial fingers 29 for loosening the peripheral portion 25 .

Each fulcrum member 15 of the present invention is preferably made of a low modulus material, such as mild steel.

In the embodiment of the invention, this fulcrum member 15 is constituted by a plurality of regularly circularly divided metal pieces (brackets) 30, each metal piece 30 forming an annular segment.

One of the metal pieces 30 described above is shown in FIG.

On one side 31 of the small metal piece is the hole 2 which engages with the small cylinder 18 and is supported by the corresponding shoulder 17.
at least one flat portion 32 provided around 0;
In order to support the diaphragm 14, a support lip 33 in the form of a protrusion facing the flat portion 32 and extending in the circumferential direction is provided.

In the example shown in FIG. 2, the flat portions 32 are formed at a distance from each other in the circumferential direction of each metal piece 30, and each flat portion extends to the outside of the support lip 33.

The circumferentially continuous support lip 33 is formed by pressing a small metal piece 30, and the circumferential tip 35 of this extracted portion is rounded as shown in Figures 2 and 3. .

Of course, it is also possible to form the flat portions 32 continuously over the entire length of the metal piece 30 in the circumferential direction.

In the example shown in FIGS. 2 and 3, the width of the flat portion 32 in the radial direction is relatively narrow, and the extension portion 3 having a circular outer shape is perpendicular to the flat portion 32.
7 is formed on the metal piece 30, and the upper surface 38 of this extension 37 is shaved off obliquely (Figs. 2 and 4).
.

Corresponding to the flat part 32 of the surface 31 of the small metal piece 30,
A flat surface 42 formed on the opposite surface 40 extends beyond the support lip 33 and parallel to said flat surface 32.

One aspect of the invention is that, as shown in FIG. When the two shoulders 17 of the small cylinder 13 are parallel to
The distance D1 between the two fulcrum members 1 attached to it
This point is smaller than the distance D2 between the flat parts 32 of No. 5 before riveting.

Therefore, when the ends of the small cylinders 13 are riveted at one side of the fulcrum member 150, that is, on the suppressing plate side and on the opposite side of the cover 10, as shown in FIG. 1, the lip of each fulcrum member 15 is deformed.

However, tightening the diaphragm 14 between the support members under these conditions is limited only by the elastic limits of the material of which the support members are constructed.

The material and dimensions of this support member are preferably such that the tightening condition slightly exceeds the maximum value of the clutch release load.

The above-described structure provides the advantage of being able to compensate for the manufacturing tolerances of the fulcrum member described above, as well as the various advantages described below.

In the modification shown in FIGS. 6 and 7, the average dimension of the flat portion 32 of the small metal piece 30 constituting the fulcrum member 15 is such that the small metal piece does not need to be extended in a right angle direction from the flat portion. There is.

In the embodiment shown in FIG. 8, two metal pieces are connected to each other, for example by an overlapping fit.

For this purpose, a male extension 46 having a circular outer shape, for example, is formed at one end of each metal piece 30, and a female cutout 47 that mates with the extension is formed at the other end.

In the special embodiment described above, one support metal piece 15
constitutes only a portion of one circle, and a plurality of these metal pieces are arranged circumferentially at predetermined positions on the corresponding surface of the diaphragm.

Of course, it is also possible for the metal pieces to be continuous in the circumferential direction to form an overall annular body, in which case it is sufficient for one metal piece to engage the relevant surface of the diaphragm.

This facilitates installation during assembly.

This modified embodiment is shown in FIG.

In this variant embodiment shown in FIG. 9, the diaphragm 1
As a means for moving the diaphragm 14 in the direction of the cover 10, an annular body 50 is provided on one side of the diaphragm 14 facing towards the cover 10.

To prevent rotation of the annular body 50, the cover 10 has a shoulder 5 which is perpendicular to the corresponding surface of the cover.
1 is provided such that an annular member 50 is held between this shoulder and the small cylindrical assembly that it surrounds from the outside.

This shoulder 51 can be formed by deforming it by the same thickness as the cover 10, as shown.

On the opposite side of the diaphragm 14 opposite to the cover 10,
As a means for moving together with this diaphragm, the above-mentioned supporting metal piece made of mild steel is provided, and on the surface facing the diaphragm of this supporting metal piece are provided the four sides of the hole 20 that engages with the small cylinder 13. At least one engaging flat surface 32 is formed which is supported on the small cylinder by a shoulder 17 and has a lip 33 projecting from this flat surface 32 extending in the circumferential direction. , the supporting metal piece 15 is in contact with the diaphragm 14 via this lip.

In this embodiment, the supporting metal piece 15 is made independently as a continuous circumferentially extending annular body.

Further, in this embodiment, the flat surface 32 is annularly continuous in the circumferential direction like the metal piece, and the support lip 33 is also continuous in the same manner.

As already mentioned, when the end portion 18 of each small cylinder 13 is riveted to the side surface of the fulcrum metal piece 15 and the side surface of the cover 10 on the opposite side, the supporting metal piece deforms and absorbs manufacturing errors. At the same time, the fulcrum metal piece 15
The diaphragm 14 will be tightened depending solely on the elastic limit of the mild steel plastic material of which it is constructed.

It is clear that the present invention is not limited to the above-described embodiments, but includes all modifications thereof.

In particular, instead of the annular body 50 of the modified example shown in FIG. 9, a supporting metal piece made of mild steel similar to the metal piece provided on the opposite side of the diaphragm is used, and this metal piece is shown in FIG. As explained above, it is also possible to continue the ring in a circular manner in the circumferential direction.
Alternatively, it is also possible to divide it into a plurality of small pieces in the circumferential direction as described with reference to FIGS. 1 to 8.

It is also clear that all materials with a small elastic limit can be used as supporting metal pieces in the present invention.

[Brief explanation of the drawing]

FIG. 1 is a partial axial cross-sectional view of a control assembly for a clutch according to the present invention. FIG. 2 is an enlarged plan view of a small metal piece forming an annular body used in the control assembly. FIG. 3 is a partial cross-sectional view of the small metal piece taken along the line ■-■ in FIG. FIG. 4 is a lateral cross-sectional view taken along line IV-■ in FIG. 2. FIG. 5 is a diagram showing the relative dimensions of the diaphragm, the fulcrum member, and the shoulder of the small cylinder of the present invention before the small cylinder is riveted. FIG. 6 is a partial plan view similar to FIG. 2 showing a modification of the present invention. FIG. 7 is a lateral cross-sectional view taken along the line ■-■ in FIG. 6. FIG. 8 is a partial plan view showing how a plurality of metal pieces forming an annular body are connected to each other. FIG. 9 is a diagram similar to FIG. 1 showing another modification of the present invention. Reference symbol, 10...Cover, 12...Mounting hole, 13
... Small cylinder, 14... Diaphragm, 15... Fulcrum member, 16... Center body, 17... Shoulder, 18...
...Reduced diameter end, 20... Hole, 22.24... Rivet, 28... Diaphragm center portion, 30... Metal piece, 32... Flat part, 33... Support lip, 37・
... Extension part, 46... Male type extension part, 47... Female type notch part, 50... Annular body.

Claims (1)

[Scope of Claims] 1. A cover fixed to the reaction plate of the flywheel, and a small cylindrical column mounted on the cover so as to be swingable about the fulcrum members via fulcrum members on each side of the diaphragm. Consists of a diaphragm. The diaphragm has a bellevue-type washer-like periphery that acts as a restraint plate to force the clutch plate toward the reaction plate or flywheel. and the diaphragm has a center portion divided into radial fingers in order to release the force applied to the suppression plate by the peripheral portion of the diaphragm, in the method of manufacturing a cover assembly for an automobile clutch, at least one of the fulcrum members one includes a fulcrum member made of a material with low elasticity such as mild steel, the fulcrum member having a hole for the small cylinder and formed around the hole to be supported by a shoulder of the small cylinder; and an arcuate rib protruding from the flat part to be supported by the diaphragm, and when the flat part is fixed to the small cylinder, the fulcrum member is permanently attached to the arcuate rib. 1. A method of manufacturing a cover assembly for an automobile clutch, wherein the fulcrum member is deformed, and the force required to deform the fulcrum member is greater than the maximum force for disengaging the clutch. 21 Each of the small cylinders has two shoulders, one shoulder supporting a fulcrum member on the side of the diaphragm, the other shoulder supporting the other fulcrum member of the diaphragm, and the small cylinder having riveted at both ends beyond said shoulder, one end of said small cylinder being riveted beyond one of said fulcrum members, and the other end being riveted beyond said cover; The distance between the shoulders of the small cylinder is smaller than the distance between the flat parts of the fulcrum member to be joined, and the fulcrum member is caused by the deformation of the bow-shaped rib of the fulcrum member during riveting of the small cylinder. A method of manufacturing a cover assembly for an automobile clutch according to claim 1, wherein the cover assembly is supported so as to engage with the cover assembly. 3. The fulcrum member on one side of the diaphragm forms a circumferentially continuous annular body, and the fulcrum member on the other side of the diaphragm is a donut-shaped annular body. A method of manufacturing an automobile clutch cover assembly. 4. Claim 1, wherein the fulcrum member on one side of the diaphragm is an annular body divided in the circumferential direction, and the support member on the other side of the diaphragm is a donut-shaped annular body. A method of manufacturing a cover assembly for an automobile clutch as described.