JPH01178425A - Manufacture of clutch driven plate - Google Patents

Abstract

PURPOSE:To obtain a clutch driven plate whose manufacturing period of time can be shortened and the thickness and compounding of materials are fixed, by a method wherein a toruslike center plate is arranged within an injection molding tool and molding is performed by injecting a clutch facing member composed of a heat-resistant fibril, thermosetting resin, a rubber material and a friction improving agent. CONSTITUTION:A toruslike center plate 5 and clutch facing member 4 are molded integrally by arranging the toruslike center plate 5 within injection molding tools 1, 2 and injecting a clutch facing member 4 comprised of a heat- resistant short fiber, thermosetting resin, a rubber material and the other friction improving agent within the molding tools 1, 2. It is preferable as the title driven plate is superior in shudder resistance and heat resistance by making use of melamine resin and NBR rubber respectively as a frictional material and rubber material. Bursting strength is not spoiled as circumferential stress due to a rotation is absorbed by the center plate 5 and a manufacturing method is of injection molding, premolding period of time can be shortened and irregularity in a clutch facing material is little, in the clutch driven plate molded integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a driven plate used primarily for a clutch disc of a dry clutch.

[Conventional technology]

Traditionally, the manufacturing method for automobile clutch driven plates has been to use asbestos fiber,
Using a long fiber such as glass fiber as a base material, the base material contains a thermosetting resin, a rubber material, a low friction improver, etc., is preformed into an annular shape, and then heated and pressure molded in a mold, Finishing such as after-curing, deburring, and polishing is performed to form the clutch facing, and then the clutch facing is sandwiched between both sides (corresponding to the pressure plate side and the flywheel side) of the center plate attached to the disc plate, and then fixed with rivets. The installation is manufactured using adhesive.

Also, JP-A No. 58-46231 and JP-A No. 61-2
A method of manufacturing a clutch driven plate in which a center plate and a clutch facing are integrally molded is also known, as disclosed in Japanese Patent No. 54315.

These are methods of manufacturing a clutch driven plate by sandwiching a center plate between two clutch facings formed by molding the above-mentioned materials into a tablet shape, and applying heat and pressure.

[Problems to be Solved by the Invention] The method for manufacturing the driven plate disclosed in the above-mentioned publication has the following disadvantages.

Before pressure molding, asbestos or glass fiber, which is the base material of the clutch facing, contains a thermosetting resin, rubber material, or other friction improver, or the parts produced in this way are preformed into a tablet shape. Since it is necessary, it takes time to manufacture it. Another drawback is that the clutch facing material becomes uneven during the process of incorporating thermosetting resin, rubber material, etc. into the base material.

The present invention aims to eliminate the above-mentioned drawbacks, and provides a method for manufacturing a clutch driven plate that uses a uniform clutch facing material, can shorten manufacturing time, and has performance equivalent to that of conventional clutch driven plates. It is intended for this purpose.・[Means for solving the problems] The structure of the present invention for achieving the above object will be explained using FIGS. 1 to 3 corresponding to the embodiments. ), an annular center plate (5) is placed inside (2), and a clutch facing member (4) made of heat-resistant short fibers, thermosetting resin, rubber material, and other friction improvers is placed in mold (1). , (2), a technical measure has been taken in which the center plate and clutch facing member (4) are integrally molded.

It is preferable to use melamine resin as the friction material since it has excellent shudder resistance. Furthermore, it is preferable to use NBR rubber as the rubber material since it has excellent heat resistance.

[Effect]

Further, according to the present invention, injection molding is possible by using a flowing member made of a heat-resistant short fiber, a thermosetting resin, a rubber material, and other friction-improving agents as a clutch facing member. Therefore, the clutch facing member is injected onto both the front and back surfaces of a center plate placed in a heated mold, and the thermosetting resin contained in the member is cured. In this way, the clutch driven plate formed into a negative body does not lose its burst strength because the center plate absorbs the circumferential stress caused by rotation. Furthermore, the friction characteristics are also the same as before.

Since the manufacturing method is injection molding, the conventional preforming time can be shortened and the clutch facing material has less unevenness.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

Trill rubber) 20-t96 was heated in an open kneader for 1 hour while adding triclene, and then 5.1% sulfur, a vulcanizing agent, and Ba80a 15"" 9
6.-Wollastonite (Callog, N Y 0
Mix 10-t96 for 2 hours. And graphite 10. t96, friction dust 5wt%
Then, melamine 35wz96 was added and mixed for 15 minutes to obtain a clutch facing member.

Injection mold 1.2(7)-1 showing the above members in Figure 1
- Injected into the cavity through the runner 8 of the mold 2.3. A center plate having an elongated size and a round hole for riveting to the disk plate was set between the molds 1.2 as shown in the center plate 5 in FIG. At this time, rivet holes were set in the center plate guide bin 6 to prevent the center plate from shifting.

Also, the temperatures before and after the cylinder of the injection molding machine were 90°C and 50°C, the temperature of the injection mold was 160°C, and the injection pressure was 1000 b/cnL! : Shita.

The properties of the clutch facing formed in this way were investigated, and tests were conducted on rotational fracture strength, coefficient of friction, degree of wear, and shudder resistance, and the results were comparable to those of conventional products.

〔Effect of the invention〕

As explained above, the production method of integrally molding the clutch driven plate of the present invention involves arranging a circular center plate in an injection mold, and using heat-resistant single fibers, thermosetting resin, rubber material, and other materials to improve friction. Since the clutch facing member made of the agent is injection molded into a mold, the conventional tablet manufacturing process and blasting time can be shortened, and a clutch driven plate with a constant thickness and material composition can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of the injection mold for the clutch driven plate;
FIG. 2 is a plan view showing an embodiment of the clutch driven plate of the present invention, and FIG. 3 is a sectional view taken along line A in FIG. Explanation of symbols 1...Molding die 2...Molding die 3...Molding die 4...Clutch facing 5.
...Center plate 6...Center plate guide pin 7...Gate 8...Runner Fig. 1\〆Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A circular center plate is placed in an injection mold, and a clutch facing member made of heat-resistant short fibers, thermosetting resin, rubber material, friction improver, etc. is injected into the mold. A method for manufacturing a clutch driven plate, characterized in that a center plate and a clutch facing member are integrally molded. 2. The method for manufacturing a clutch driven plate according to claim 1, wherein the thermosetting resin is a melamine resin.