JPH024251Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a friction plate used for transmitting or braking power in a power coupling device such as a clutch or brake, and is particularly applicable to a fixed plate of a power coupling device. This invention relates to an improvement of a friction plate that rotates between the actuating plate and the actuating plate.

[Conventional technology]

Conventionally, as an example of a power coupling device, a brake has been proposed in which a friction plate 3 rotates between a fixed plate 1 and an actuating plate 2, as shown in the longitudinal cross-sectional side view of the upper half of FIG. In this device, a friction piece 5 is fitted into a through hole 4 formed in a friction plate 3, and the friction piece 5 is moved by the action of an actuating plate 2 connected to a rotating shaft R. Since braking is performed by being pressed against the fixed plate 1, it is necessary for the friction piece 5 to always slide smoothly within the through hole 4 during braking or when returning to the driving state. It is required that the dimensional error with respect to the hole be extremely small.

Therefore, in the above device, a friction piece 5 having a shape as shown in the plan view of FIG. Partially cut out 2
It is made up of two members a and b joined together at their cut surfaces c and c'.

[Problem that the invention attempts to solve]

Such a friction piece is made of a cylindrical member, so it is relatively easy to manufacture and it is easy to improve the dimensional accuracy, but it is also necessary to improve the dimensional accuracy of the through hole that receives it. For this type of friction plate, in which the friction piece slides within the through-hole with the entire outer surface of the friction piece along the entire inner surface of the through-hole, the dimensions of the friction piece and the through-hole must be matched extremely precisely. This problem still cannot be avoided, and since such dimensional tolerances are extremely small, dimensional discrepancies between the two are likely to occur, and in such cases, friction pieces are likely to wear out and generate heat. Additionally, there is generally a problem in that the friction piece hits the inner circumferential surface of the through hole during driving and braking, causing noise.

[Means for solving problems]

This idea fundamentally solves the above-mentioned problems, that is, eliminates the troublesome dimensional accuracy required between the friction piece and the through hole, as well as the wear and heat generation of the friction piece. The purpose of this friction plate is to provide a friction plate that generates less impact noise during driving and braking, and has a plurality of through holes in which friction pieces are fitted so as to be slidable in the axial direction.A friction plate for power coupling devices. In this step, the friction piece is press-fitted into an elastic member having an engaging portion projecting outward, and the engaging portion of the elastic member is engaged with an engaging groove formed in a through hole of the friction plate. , the friction piece is slidably fitted into the through hole of the friction plate via the elastic member, and between the outer peripheral surface of the non-engaging part of the elastic member and the inner peripheral surface of the through hole of the friction plate. It is characterized by having a gap formed between.

〔Example〕

Next, embodiments of the friction plate of this invention will be described with reference to the drawings.

FIG. 1 is a partial plan view showing an embodiment of the friction piece according to this invention, and FIG. 2 is a longitudinal sectional side view taken along the line X--X in FIG. The friction plate 6 obtained by press forming or machining an aluminum plate has a plurality of through holes 7 (which have two grooves 7a, 7a in the axial direction formed on the inner peripheral surface as engagement grooves). (only one is shown as they all have the same shape and dimensions) are drilled therein.

Each of the above-mentioned grooves 7a includes a protruding part 8a as an engaging part protruding to the outside of a bush-shaped elastic member 8 made of a beryllium copper plate, a stainless steel plate, rubber, etc., and a bent part formed at the separated part. 8b and 8b are slidably engaged with each other, and an arc-shaped gap S is formed between the inner circumferential surface of the through hole other than the groove portion and the outer circumferential surface of the elastic member.

On the other hand, a cylindrical friction piece 9 made of, for example, a resin molded product containing asbestos is press-fitted inside the annular elastic member 8, and the protrusion 8a
By sliding the bent portion 8b within the groove portion 7a, the friction piece 9 is slidably fitted into the through hole 7 integrally with the elastic member 8.

In this way, in this invention, only the outer surfaces of the protruding portion 8a and the bent portion 8b of the elastic member 8, and the inner surface of the groove portion 7a serve as sliding surfaces. Not only the outer circumferential surface of the friction piece 9 which is separated from the inner circumferential surface of the friction piece 7 but also the gap S
The tolerance for dimensional accuracy of the inner circumferential surface of the through hole 7, which is separated from each other by In addition, it becomes easier to form the elastic member and the friction piece, and even if the pressing force in the rotational direction of the friction piece is applied to the elastic member due to the rotational force of the rotating member that acts during driving or braking, the elastic member and the friction piece can be easily formed. A gap is formed between the elastic member and the inner peripheral surface of the through hole, and since one of the members is an elastic member, the contact between the elastic member and the inner circumferential surface of the through hole is buffered, and the contact between the two is cushioned. The sound is significantly reduced,
Further, since the friction piece itself has no sliding surface at all, abrasion and heat generation of the friction piece are naturally avoided.

Although the cross-sectional shape of the friction piece 9 is circular in this embodiment, the cross-sectional shape of the friction piece 9 can be any shape other than a circle, such as an ellipse, a square, or a fan shape. One protruding part and two bent parts are formed as the engaging part, but when the friction piece is fitted into the through-hole of the friction plate via the elastic member, the friction piece will not fit into the elastic member. Since it is sufficient that the elastic member is press-fitted and fixed, for example, two protruding parts and two bent parts, or no protruding part and four bent parts can be formed on the elastic member. The number of protruding parts and bent parts in the elastic member can be appropriately selected within the above-mentioned range. Furthermore, it goes without saying that the materials for the friction plates, elastic members, and friction pieces may be appropriately selected from materials other than those exemplified above.

[Effect of idea]

As is clear from the above explanation, according to this invention, the outer periphery of the friction piece is surrounded by an elastic member, and the sliding part when the friction piece slides is connected to the groove of the through hole and the groove part of the through hole. Since a gap is formed between the elastic member and the inner circumferential surface of the through hole, it is limited to the protruding portion and the bent portion of the elastic member.
Friction pieces that do not form sliding parts, elastic member parts other than protrusions and bent parts, and the dimensions and shapes of the inner circumferential surfaces of through holes other than grooves do not need to be matched as precisely as conventional ones. Manufacturing is facilitated, abrasion and heat generation on the side surfaces of the friction piece are completely prevented, and the impact noise between the elastic member and the inner circumferential surface of the through hole that occurs during driving and braking is significantly reduced.

Furthermore, since the member interposed between the friction piece and the inner circumferential surface of the through hole has elasticity, dimensional errors in the groove and the protrusion and bending part of the elastic member engaged therein are absorbed, and The above-mentioned effect of reducing the hit noise is further promoted.

[Brief explanation of the drawing]

Fig. 1 is a partial plan view showing an embodiment of the friction plate according to this invention, Fig. 2 is a longitudinal cross-sectional side view taken along the line X-X in Fig. 1, and Fig. 3 is an upper half showing a conventional brake. A vertical side view, and FIG. 4 is a plan view showing a part of the friction plate used in the brake of FIG. 3. In the drawings, 1... fixed plate, 2... operating plate, 3, 6... friction plate, 4, 7... through hole, 5, 9... friction piece, 8...
...Elastic member, 7a...Groove, 8a...Protrusion, 8
b...Bending part.

Claims (1)

[Scope of utility model registration request] In a friction plate for a power coupling device having a plurality of through holes into which friction pieces are slidably fitted in an axial direction, the friction pieces are press-fitted into an elastic member having an engaging portion projecting outward. , by engaging the engaging portion of the elastic member with an engaging groove formed in the through hole of the friction plate, the friction piece can be freely slid into the through hole of the friction plate via the elastic member. 1. A friction plate for a power coupling device, wherein the friction plate is fitted together and a gap is formed between the outer circumferential surface of the non-engaging portion of the elastic member and the inner circumferential surface of the through hole of the friction plate.