JPS599770B2 - friction clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm spring type friction clutch.

As shown in FIG. 1, which is a partial vertical cross-sectional view, in this type of clutch, the outer circumference of a diaphragm spring 6 comes into contact with the tip of an annular projection 5 provided on the back surface 3 of an annular pressure plate 1 on the opposite side from the friction member 2. The radially inner ends of, for example, three plate-shaped clips 7 (only one is shown) arranged at intervals in the circumferential direction are in contact with each other, and on the surface opposite to the protrusion 5 on the outer periphery of the spring 6 are arranged at intervals in the circumferential direction. are in contact.

The outer end of each clip 7 has an axial (horizontal) rivet 1 attached to the back side of the protrusion 10 on the outer periphery of the pressure plate 1.
It is fixed by 1.

12 is a clutch force bar, and 13 is two wire rings that serve as fulcrums for the spring 6.

The structure in which the clip 7 is fixed to the pressure plate 1 by the rivet 11 extending in the clutch axial direction as described above has the following advantages.

In other words, the thickness of the pressure plate 1 and the protrusion 5 (first
(length in the left-right direction in the figure) can be set without considering the rivet 11, and by reducing the thickness, the length in the axial direction of the entire clutch can be shortened.

Further, the mounting hole for the rivet 11 may be a simple hole, and there is no need to make the hole LJL, so the processing of the rivet mounting hole is easy.

Furthermore, rivet 110 head (head on the opposite side from clip 7)
It is necessary that the surface on which the holder is seated is flat, but such a flat surface is on the same side as the friction member 2 (the left side of the protrusion 10 in Fig. 1).
It is sufficient to machine the friction material 2 parallel to the surface.

Therefore, machining of the seat of the rivet head is easy.

However, in a conventional clutch, the entire rivet 11 is located outside the outer circumferential edge 16 of the friction member 2, as shown in FIG. 2, which is the portion viewed from arrow A in FIG.
Since the clutch housing 17 protrudes by a distance t from the clutch housing 17, the radius R of the clutch housing 17 also needs to be large, resulting in a problem that the entire clutch becomes bulky.

The present invention solves the above problem by fixing a clip with an axial rivet to the outer periphery of the back surface of the pressure plate opposite to the friction surface, and applying the outer periphery of the diaphragm spring to the back surface of the pressure plate using the clip. In the clutch that is brought into contact, at least a portion of the rivet is inserted inward from the outer periphery of the friction surface, a recess is provided on the outer periphery of the friction member, and the head of the rivet on the friction surface side is accommodated in the recess. In addition, it is characterized in that a space is formed within the recess into which the abrasion powder on the friction surface flows.This will be explained next with reference to FIGS. 3 and 4.

In FIGS. 3 and 4, the same reference numerals as those in FIGS. 1 and 2 indicate corresponding parts.

As is clear from Fig. 4, the center Q of the rivet 20 is
The rivet 20 is located on the outer peripheral edge 16 (on the extension line of the arcuate outer peripheral edge 16), and the inner half of the rivet 20 on the clutch center side
It's getting into the side.

Furthermore, the protrusion 21 for attaching the rivet 20 protrudes from the outer peripheral edge 16 by only a distance t1, which is about half of the distance t, and therefore the radius R1 of the clutch housing 22 is also the same as the conventional radius R.
It is possible to make it smaller.

Furthermore, a generally semicircular recess 23 that is open toward the outer peripheral edge 16 is formed in the friction surface 2, and the head 25 of a rivet 290 is inserted into the recess 23 as shown in FIG.

The recess 23 serves as a groove for discharging abrasion powder generated on the friction surface 2.

As explained above, according to the present invention, since the rivet 20 is inserted into the friction surface 2 side, the amount of protrusion of the protrusion 21 can be reduced, and therefore the radius R1 of the housing 22 can be reduced to make the clutch more compact. Can be done.

In addition, a recess 23 is provided on the outer periphery of the friction surface 2, and the head 25 of the rivet 22 on the friction surface side is accommodated in the recess 23, so that the head 2
5 never comes into contact with facing F.

Furthermore, in the present invention, a space is formed in the recess 23 into which the wear powder on the friction member 2 flows, so that the wear powder may cause the friction member 2 to slip or wear out the facing F that is in pressure contact with the friction member 2. It is possible to eliminate the problem of powder being abrasive.

Even if the concave portion 23 is provided, the area reduction rate of the friction surface 2 is very small, so the surface pressure of the friction surface 20 when the clutch is connected hardly changes compared to the conventional case, and the wear of the friction surface 2 does not increase. .

In addition, when embodying the present invention, the entire rivet 20 may be placed inside the outer peripheral edge 16 of the friction member 2 as shown in FIG.

Further, the present invention can also be applied to a coil spring type clutch.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view of the conventional product, FIG. 2 is a partial view taken in the direction of arrow A in FIG. 1, FIGS. 3 and 4 are partial views of the present invention corresponding to FIGS. 1 and 2, and FIG. The figure corresponds to FIG. 4 showing a modification. 1...Pressure plate, 2...
Friction surface, 3...Back surface, 6...Diaphragm, 16...Outer periphery, 20...Rivet, 23...Recess.

Claims (1)

[Claims] 1. In a clutch in which a clip is fixed to the outer periphery of the back surface of the pressure plate opposite to the friction surface by an axial rivet, and the outer periphery of the diaphragm spring is brought into contact with the back surface of the pressure plate by the clip, at least one of the rivets A part of the friction surface is inserted inward from the outer periphery of the friction surface, and a recess is provided on the outer periphery of the friction surface.
A friction clutch characterized in that the head of the rivet on the friction surface side is accommodated in the recess, and a space is formed in the recess into which abrasion powder on the friction surface flows.