JPS6170225A - Resin mold clutch facing - Google Patents

Abstract

PURPOSE:To improve rotation burst strength without an increase in the specific gravity of a facing, by a method wherein a resin mold clutch facing is formed integrally with a backup material formed with a ring material made of a light metal. CONSTITUTION:A resin mold clutch facing 1 is formed in the shape of a disc ring and. A backup material 2, which is formed in the shape of a disc ring by the use of aluminium, being a light alloy, and has 8 triangular through-holes 4 formed at equal intervals in its peripheral surface, and a resin mold clutch facing material 3, which is formed in the shape of a disc ring by mixing cashew dust and barium sulfate in asbestos, serving as a base material, and phenol resin, serving as a binder, are laminated together to integrally form them by heating and pressure molding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin molded clutch facing used, for example, in a friction clutch of an automobile, and more specifically, to an improvement to improve rotational burst strength and reduce specific gravity. This relates to a resin molded clutch facing.

[Conventional technology]

Conventional resin-molded clutch facings are usually made by impregnating asbestos non-woven fabric with phenol resin as a binder and molding it under heat and pressure. Compared to molded woven clutch facings, the quality is generally more stable, and the temperature characteristics of the friction coefficient are much flatter, resulting in superior friction performance.

[Problem that the invention seeks to solve]

However, conventional resin molded clutch facings are inferior to woven clutch facings in terms of the degree of difficulty in causing peeling or destruction of the facing, that is, rotational burst strength, compared to clutch discs, so conventionally, rotational burst strength has not been a problem. The company had no choice but to limit its adoption to specific vehicles that did not.

Therefore, in order to improve the rotational burst strength, we developed materials such as iron, brass, etc., which have significantly higher tensile strength than nonwoven fabrics.
A method has been proposed for reinforcing the strength of the clutch facing, such as by providing a ring-shaped metal plate made of copper or the like as a backup material for the facing material. However, although these methods can improve the rotational burst strength, the specific gravity of the clutch facing itself increases significantly, which increases the inertia torque of the clutch disc and makes it difficult to smoothly shift the gears. There is a bug that causes new problems such as

[Means for solving problems]

Therefore, this invention was made to solve the above-mentioned problems, and by integrally molding a backup material made of a light metal ring material on a resin molded clutch facing material, it is possible to avoid increasing the specific gravity of the facing. , which has improved rotational burst strength.

That is, in the resin mold clutch facing according to the present invention, a bank-up material made of a light metal ring plate with a plurality of through holes formed at equal intervals is laminated on the resin mold clutch facing material and then heated and press-molded. It is molded in one piece.

The present invention is made of a light metal that has greater strength and rigidity than asbestos, has a much lower specific gravity than conventional bank amplifier materials made of metal plates, and has multiple through holes formed as a back-up material for clutch facings. This ring plate is molded on the back side of the facing, which corresponds to the clutch disc side part.

Further, in detail, the bank amplifier material of the present invention is a ring temporarily formed from a light metal such as aluminum, duralumin, or magnesium with a specific gravity of 5 or less, and its shape is the same as that of the resin molded clutch facing material. ing. Further, the thickness of the backup material is suitably the same as or less than the thickness of the resin molded clutch facing material; if it is thicker than the thickness of the resin molded clutch facing material, the specific gravity will increase, which is not preferable. In addition, a plurality of through holes are formed at regular intervals in this backup material to reduce specific gravity and improve balance. The shape of the through-hole formed in the bank-up material is not particularly limited; for example, a circular shape, an elliptical shape, a polygonal shape such as a triangle, a square, a hexagon, a trapezoid, a groove shape, etc. may be selected as appropriate. can be formed.

In addition, since the surface of the backup material that will be bonded to the resin mold clutch facing material is coated with a phenolic resin or nitrile phenol resin adhesive, it is desirable to roughen it by shot blasting or the like. The surface roughness is preferably in the range of 5 to 15 μRz. If the surface roughness is 5 μRz or less, no anchoring effect of the adhesive to the bank-up material can be expected, and if the surface roughness is 15 μRz or more, the anchoring effect will not improve even though the surface is rough. Further, when applying an adhesive to the backup material, it is desirable to sufficiently degrease the surface thereof, and the degreaser used at that time is not particularly limited.

Furthermore, the resin mold clutch facing material used in the present invention may be any facing material conventionally used for resin mold clutch facings.
-S is made of a base material such as asbestos or graphite impregnated with phenol resin as a binder. In this case, the amount of phenol resin to be blended may be, for example, at the level conventionally used. In addition to the base material and binder, the resin molded clutch facing material also contains organic fillers such as cashew dust and friction dust to adjust the coefficient of friction, as well as organic fillers to prevent friction. For example, various additives commonly used in this main facing material, such as barium sulfate, clay, and calcium carbonate, can be blended.

Furthermore, when integrally molding the laminated backup material and the resin molded clutch facing material, commonly used conditions can be used as they are, such as a molding temperature of 130°C to 280°C and a surface pressure of 50 kg.
The resin may be heated and pressure molded under conditions ranging from /- to 200 kg/ad (furthermore, after molding, an appropriate heat treatment may be applied to harden and ripen the phenol resin.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view of a resin mold clutch facing according to the present invention, FIG. 2 is an exploded perspective view of a resin mold clutch facing according to the present invention, and FIGS. 3 and 4 are a perspective view of a resin mold clutch facing according to the present invention. It shows a schematic cross-sectional view of the molding process.

As shown in FIGS. 1 and 2, the resin mold clutch facing 1 (hereinafter simply referred to as facing 1) of the embodiment has a disc ring shape, and is formed from light alloy aluminum into a disc ring shape. A disk is made by mixing back-up material 2 with eight triangular through holes 4 formed at equal intervals on its circumferential surface, asbestos as a base material, phenol resin as a binder, cashew dust, and barium sulfate. A ring-shaped resin molded clutch facing material 3 (hereinafter simply referred to as facing material 3) is laminated and integrally molded by heating and pressure molding. The facing 1 is used by pasting the bank-up material 2 on both sides of a clutch disk of a disk clutch (not shown) with the bank-up material 2 facing the disk side.

Next, a method of manufacturing this facing 1 will be explained with reference to FIGS. 1 to 4.

In FIGS. 1 and 4, 10 is a fixed type,
A disk ring-shaped groove 11 is formed on the upper surface of the fixed mold 10, and a flat surface 12 is formed around the groove 11. Also,
A movable mold 13 is disposed above the fixed mold 10, and a ring-shaped protrusion 14 is formed on the lower surface of the movable mold 13 at a position opposite to the groove 11 formed in the fixed mold 10. Then, when the movable mold 13 is clamped to the fixed cylindrical mold 10, the movable mold 1
The protrusion 14 of No. 3 is fitted into the groove 11 of the fixed mold 10.

Then, the back amplifier material 2 is molded first.

First, a bank-up material 2 formed in the shape of a disc ring is punched out from a coiled aluminum plate using a press machine (not shown). At this time, triangular through-holes 4 whose vertices are located on the outside and the bottoms are located on the inside are simultaneously bored at equal intervals on the circumferential surface. Next, the surface of the backup material 2 to be joined to the facing material 3 is roughened by an average of 10 μRz by shot blasting, and the surface is cleaned with an alkaline degreaser. Subsequently, an adhesive 5 made of phenolic resin is applied to the surface of the fixed mold 10, and the circular ring-shaped groove of the fixed mold 10 shown in FIG. It can be stored in 11.

Next, facing 1 is formed. That is, after impregnating asbestos with a predetermined amount of phenol resin as a binder, and then adding cashew dust and barium sulfate,
Facing material 3 made into the same shape as backup material 2
Preform. Thereafter, as shown in FIG. 3, the facing material 3 is placed so as to face the Jll of the fixed mold 1 in which the bank-up material 2 has been molded. As a result, the facing material 3 is placed a on the top surface of the hack-up material 2.

In this state, as shown in FIG.
/cat under heating and pressure molding, and the molded product as it is for 20
Heat treatment is performed at 0° C. for 4 hours to harden and ripen. Further, the facing material 3 is polished to form a facing 1 of a predetermined thickness, and finally an integrally molded facing 1 as shown in FIGS. 1 and 2 is formed.

When the rotational burst strength of the facing 1 molded in the above process was examined, it was confirmed that the rotational burst strength of the facing 1 was significantly improved compared to conventional resin molded clutch facings. In addition, when we conducted a specific gravity measurement test, we found that facing 1
The specific gravity was much lower than that of conventional metal plate resin molded clutch facings.

In this embodiment, the triangular through-hole 4 is formed in the bank-up material 2, but the present invention is not limited to the triangular shape; for example, as shown in FIGS. Partial plan view of figure (a) and its b-
It can have a shape as shown in the cross-sectional view of line b (bl).

That is, in FIG. 5, long groove-shaped through holes 4a and 4b with curvature are formed on the outer and inner circumferential surfaces of the backup material 2, respectively, at equal intervals so that they partially overlap. Further, in FIG. 6, trapezoidal through holes 4c are formed on the circumferential surface of the backup material 2 at equal intervals.

〔Effect of the invention〕

As explained above, in the resin mold clutch facing according to the present invention, a bank up material in which a plurality of through holes are formed at equal intervals in a ring plate of a light metal layer is laminated on the resin mold clutch facing material. Since it is integrally molded, the rotational burst strength can be improved without increasing the specific gravity of the facing.

Further, in the resin molded clutch facing of the present invention, since the specific gravity does not increase, it is possible to smoothly change the speed change gear, and there is an effect that the clutch facing can be applied to various types of vehicles.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a resin mold clutch facing according to the present invention. FIG. 2 is an exploded perspective view of a resin molded clutch facing according to the present invention. 3 and 4 are schematic cross-sectional views of the molding process of the resin mold clutch facing according to the present invention. FIG. 5 and FIG. 6 are explanatory diagrams showing the surface shape of the bank-up material according to the present invention. 1.--Resin mold clutch facing 2.--Backup material 3.--Resin mold clutch facing material 4
−・−・−Through hole 5・−・−・Adhesive Applicant Toyota Motor Corporation No. 2rA Figure 3 Figure 4(a) Figure 6

Claims (1)

[Claims] It is characterized by being integrally formed by laminating a back-up material made of a light alloy ring plate with a plurality of through holes formed at equal intervals on a ring-shaped resin molded clutch facing plate and molding it under heat and pressure. Resin mold clutch facing.