JPH04102723A - Clutch disc - Google Patents

Abstract

PURPOSE:To heighten bonding strength by sandwiching a cushion plate between the back sides of a pair of clutch facings and bonding the cushion plate and a reinforcing plate on the backs of the clutch facings by welding. CONSTITUTION:A cushion plate 20 is fixed on the outer periphery of a disc plate 14 and it is sandwiched by a pair of clutch facings 40. A reinforcing plate 30 is bonded with adhesive all over the backs of the clutch facings 40, and the cushion plate 20 is welded and bonded on both of the reinforcing plates 30. In this way, strength of the clutch disc is heightened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to a clutch disc for a friction clutch for a vehicle.

[Conventional technology]

This type of clutch disc employs a type in which a reinforcing plate, such as a steel plate or an aluminum plate, is bonded to the back surface of the clutch facing as a means of increasing its burst strength. However, in many cases, the seven acing and the cushioning plate are connected with rivets. In this case, since holes for fixing rivets are drilled in the facing and reinforcing plate, there is a risk of cracks occurring from these holes, and even though reinforcing plates are used, a significant improvement in burst strength cannot be expected. do not have. Additionally, the presence of rivets reduces the wear limit of the facing.

Various measures have been taken in the past to avoid such situations. For example, in the clutch disc disclosed in Japanese Utility Model Application Publication No. 56-102833, a reinforcing plate is bonded to the back surface of a clutch facing, and a cushioning plate is further bonded to this reinforcing plate. This eliminates the need for the rivet and its fixing hole.

[Problem to be solved by the invention]

Since the clutch disc disclosed in the above publication has a reinforcing plate and a cushioning plate bonded together, its strength is not reliable even when the clutch disc is exposed to severe conditions such as high rotations and high loads. Scarcity (2.

The technical problem of the present invention is to provide a clutch disc with high reliability in terms of strength and durability.

[Means for Solving the Problems; - In order to solve the above problems, the present invention is characterized in that the bonding strength between the reinforcing plate and the cushioning plate is increased.

In other words, the clutch disc of the present invention has a cushioning plate sandwiched between the back surfaces of a pair of annular clutch facings, and reinforcing plates bonded to the back surfaces of both latch face sinks. The cushioning plate 1 and the reinforcing plate are welded together.

[For production]

In the above configuration, the pair of clutch facings and the reinforcing plate have a large mutual contact area, for example, if both have substantially the same shape, they will contact over the entire surface, so that sufficient bonding strength can be maintained by adhesion. On the other hand, due to its shape, the contact area of Kusonyoninku Plate 1 with the reinforcing plate is small. However, (7) Since these are bonded to each other by welding, the bonding strength can be sufficiently increased.

〔Example:· Next, embodiments of the present invention will be described with reference to the drawings.

First Embodiment First, FIG. 1 shows a partially broken plan view of a clutch disc in a friction clutch for a vehicle, and FIG.
A sectional view taken along the line ■-■ in the figure is shown.

In these drawings, the clutch hub 10 is assembled to the outer periphery of the implant shaft of the transmission (not shown in the figure) so as to be able to transmit four rotations.Furthermore, on both sides of the flange 12 formed on the outer periphery of the clutch hub 10, , a disc plate 14 and sub disc plates 1 and 16 are assembled.These two disc plates 114. and 16 are connected to each other and have a relative angular displacement within a certain range with respect to the clutch hub 10. Furthermore, a plurality of 1-john springs 18, which are elastically deformed by mutual angular displacement, are assembled between the two discs 14 and 16 and the flange 12 of the clutch hub 10. As is well known,

A plurality of cushioning plates 20 are arranged along the circumferential direction on the outer periphery of the disk plate 14.
are fixed by rivets 24, respectively. These cushioning plays I/20 are sandwiched between a pair of annularly formed clutch facings 40. Further, reinforcing plates 30 having substantially the same shape as the facings 40 are bonded to the back surfaces of both clutch facings 40 by full-surface adhesive.

Each cushioning plate 20 is connected to both reinforcing plates 30 by welding.

The clutch facing 40 is strongly clamped between a flywheel (not shown) and a pressure plate 1 by a predetermined set load when the friction clutch is connected. When the clutch is connected and released, each cushioning plate 20 repeats elastic deformation (compression and return) to perform a cushioning function in response to the clutch operation. That is, each cushioning plate 2
As is clear from FIG. 3, which shows a perspective view of the third disc, the clutch disc 0 is bent along the circumferential direction of the clutch disc. Each cushioning plate 20 has a joint surface 22 that is welded to both reinforcing plates 30, respectively.

In addition, the ends of each cushioning plate 20 following the respective joint surfaces 22, that is, both ends of the cushioning plate 20, have folded portions 2 bent in opposite directions.
It is 3. Moreover, each cushioning plate has 20
A part of the inner peripheral side of the cushioning plate 2
0 to the disc plate 1/14 with a rivet 24 as described above (7).

Next, a procedure for connecting the cushioning plate 20, reinforcing plate 30, and clutch facing 40 will be explained with reference to FIGS. 4 to 8. First, the cushioning plates 20 are arranged between two reinforcing plates 30 as shown in FIG. 4, and then stacked as shown in FIG. 5(A). Therefore, as shown in FIG. 5(B), the joint surfaces 22 of each cushioning plate 20 are welded to the back surfaces of both reinforcing plates 30 using an inner electrode 50 and an outer electrode 51 for spot welding. . This spot welding is performed at three or more locations on each joint surface 22 of the cushioning plate 20. Further, it is desirable to set the distance between adjacent welding points in consideration of the shunting effect of spot welding.

As shown in FIG. 5(C), the inner electrode 50 has a shape that allows it to be easily inserted into the gap formed on the back surface of the joint surface 22 between the reinforcing plate 30 and the cushioning plate 20.
Further, the back side of the electrode is an insulating portion 50a.

After completion of spot welding, Fig. 6 (A) (B)
As shown in the figure, the surfaces of both reinforcing plates 30 (the adhesive surfaces with the clutch facing 40) have irregularities due to welding. Therefore, these irregularities are removed by polishing.

Subsequently, adhesive is applied to the back surfaces of both clutch facings 40, and these are bonded to the surface of the reinforcing plate 30, respectively, as shown in FIGS. 7(A) and 7(B).

Since this adhesion is performed under high temperature and high pressure for a long time, a spacer 52 is inserted into the gap formed on the back side of the joint surface 22 of each cushioning plate 20 as shown in FIG. 7(B). Let me intervene.

After the adhesion is completed, the spacer 52 is removed as shown in FIGS. 8(A) and 8(B), and a semi-finished clutch disc is completed.

As mentioned above, the spot welding points of the joining surface 22 of the cushioning plate 20 to the reinforcing plate 30 should be three or more, but in the case of four-point welding, as shown in FIG. In the case of three-point welding in Figure (B), the 9th
Figure (C) shows the welding points of the joint surface 22 in the case of Daikoku welding.

Second Embodiment In the embodiment shown in FIGS. 10(A) and 10(B), the folded portions 23 formed at both ends of the cushioning plate 20 of the first embodiment are eliminated. .

Third Embodiment In the embodiment shown in FIG. 11, the coupling portion 21 of each cushioning plate 20 is eliminated, and instead, the disk Connecting portion 3 fixed to plate 14 with rivets etc.
2 is formed.

In the second and third embodiments, parts that are considered to have the same or equivalent configuration as those in the first embodiment are given the same reference numerals in the drawings of the respective embodiments, and redundant explanations will be omitted.

〔Effect of the invention〕

As described above, in the present invention, by welding the reinforcing plate and the cushioning plate to increase their mutual bonding strength, the strength of the clutch disc is increased, and reliability with respect to durability can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway plan view of a clutch disc, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. A perspective view of one cushioning plate. Figures 4 to 8 show the procedure for connecting the cushioning plate, reinforcing plate, and clutch facing. Figure 4 shows the cushioning plate and reinforcing plate. FIG. 5(A) is a perspective view showing the arrangement of the cushioning plate and reinforcing plate for welding, and FIG. 5(B) is a perspective view showing the arrangement with the plates.
) is a sectional view showing details during welding, FIG. 5(C) is a perspective view showing a part of the inner electrode used for spot welding, FIG. 6(A) is a perspective view after welding is completed, and FIG. Figure 6 (B) is a cross-sectional view 4 showing the details, Figure 7 (A) is a perspective view showing the arrangement for gluing the clutch facing, and Figure 7 (B) is the details of the gluing work. Cross-sectional view, Figure 8 (A
) is a perspective view after completion of adhesion, and FIG. 8(B) is a sectional view showing details thereof. 9(A), 9(B), and 9(C) are respective explanatory views showing examples of changes in the welding points of the cushioning plate to the reinforcing plate, and 1.theta.(A) is the cushioning of the second embodiment. FIG. 10(B) is a plan view showing the blade, FIG. 20... Cushioning plate 1 30... Reinforcing plate 40... Clutch leaf J-sink

Claims (1)

[Scope of Claims] A clutch disc of a type in which a cushioning plate is sandwiched between the back surfaces of a pair of annularly formed clutch facings, and reinforcing plates are bonded to the back surfaces of both clutch facings, comprising: A clutch disc characterized by a reinforcing plate and a reinforcing plate being joined together by welding.