JPH01238927A - Manufacture of clutch facing - Google Patents

Abstract

PURPOSE:To inexpensively obtain a clutch facing having no generation of a noise by employing glass fiber to which at least solid lubricant adheres as a base material fiber. CONSTITUTION:Glass fiber or glass fiber and asbestos fiber are employed as a base material fiber. As solid lubricant adhering to the surface of the fiber, molybdenum disulfide, graphite, antimony sulfide, etc., are employed, the glass fiber is dipped in solution in which it is dispersed in dispersing medium such as water, alcohol, or the dispersion solution is sprayed on the glass fiber. This is formed in a yarnlike or tapelike state or the like, pastelike filler is pressurized and adhering, and then dried. This is preliminarily molded by a cross winding method, a spirally winding method. etc., in a laminate state, heated and compressed to be molded in a metal mold, and baked to obtain a product. Thus, a stable frictional performance is obtained, thereby preventing it from generating noise at the time of clutch operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is directed to a method of manufacturing clutch facings used in automobiles, industrial machinery, etc.

[Conventional Technology Issues] Conventionally, clutch facings have been made using base fibers mainly made of asbestos fibers in the form of yarn, tape, roving, cross, etc., and a thermosetting resin such as phenolic resin or a rubber material such as natural rubber. Alternatively, impregnating the resulting base fiber with a mixture of a thermosetting resin and a rubber material, a rubber material, a thermosetting resin, a vulcanizing agent, a vulcanization accelerator, a curing agent, a lubricant 1, an inorganic short fiber, After mixing and dispersing friction modifiers etc. with a mixer etc., adhering the resulting paste filler, and preforming it into a laminate,
It is manufactured by heating and compressing it in a mold, etc., and then hardening it by post-firing.

By the way, the clutch facings obtained as described above had drawbacks such as a low coefficient of friction, low v1 mechanical strength, and a short lifespan of the clutch facings.

In order to compensate for these problems, clutch facings have recently been manufactured by combining asbestos & R male with glass fibers, etc., using the same method as above.This clutch facing has excellent mechanical strength, high friction coefficient 1, and long lifespan. It has also been widely used for a long time.

However, such a clutch facing made of a combination of asbestos fiber and glass fiber generates squeal (abnormal noise) when the clutch is engaged, which not only causes discomfort to the driver, but also causes noise due to the vibration of the squeal. , there is a drawback that it has a negative effect on the parts around the clutch, and if the squeal gets worse,
This may cause running problems such as shudder. In order to improve this drawback, there is a method of replacing all or part of the asbestos fibers and glass fibers with aromatic polyamide fibers, carbon fibers, etc., but these methods are both expensive and impractical.

The present invention has been made to solve the problems associated with conventional clutch facings as described above.
The purpose of this is to prevent squealing by applying a solid lubricant to the surface of base fibers such as glass fibers before manufacturing clutch facings in the normal clutch facing manufacturing process. The purpose is to provide clutch facings at low cost.

[Means for Solving the Problems] Therefore, the present invention impregnates a base fiber with a thermosetting resin, a rubber material, or a mixture of a thermosetting resin and a rubber material, and then:
A base material 1 obtained by attaching a pasty filler containing a thermosetting resin or a mixture of a thermosetting resin and a rubber material! In a method for manufacturing a clutch facing, which comprises preforming fibers into an M-enhanced shape, heating and compressing the obtained preform, and post-sintering, glass fibers to which a solid lubricant is attached are used as at least the base fibers. The present invention provides a method for manufacturing a clutch facing.

1 Effect] Hereinafter, the method for manufacturing a clutch facing according to the present invention will be described in detail.

At least glass fiber is used as the base fiber used in manufacturing the clutch facing according to the method of the present invention. That is, as the base fiber, glass fiber can be used alone or glass fiber and asbestos fiber can be used together, but asbestos u! Instead of I-fiber, IFI of mineral fiber, metal fiber, carbon fiber, inorganic fiber such as ceramic & A-fiber, aromatic polyamide fiber, organic fiber such as cotton, hemp, rayon, etc. or a combination of two or more may be used. good.

A feature of the present invention is that a solid lubricant is attached to the surface of the glass fiber used as the base fiber.

Examples of solid lubricants that can be used in the present invention include molybdenum disulfide, graphite, and antimony sulfide. A solid lubricant can be prepared by dipping the glass fibers in a solution in which the solid lubricant described above is dispersed in a dispersion medium such as water, alcohol, mineral oil, ester, ketone, etc., or by spraying the dispersion solution onto the glass fibers. can be attached to the glass fiber surface. The concentration of the solid lubricant in the dispersion solution prepared at this time is preferably 0.1 to 20% by weight,
An adhesive can also be added to the dispersion solution to enhance the adhesive effect of the lubricant. Examples of adhesives that can be used include PVA, epoxy resins, vinyl acetate resins, etc., and the amount used is about 0.1 to 5% by weight of the dispersion solution. The amount of solid lubricant attached to the glass fibers is preferably 0.1% by weight or more, and if the amount is less than 0.1% by weight, it is not preferable because the solid lubricant has no treatment effect.

Further, it is preferable to treat glass fibers to which a solid lubricant has been attached by immersing them in a rubber solution. Rubbers that can be used include butadiene rubber (BR), styrene-butadiene rubber (SBR), and acrylonitrile-butadiene rubber (N
Synthetic rubber such as BR) or natural rubber can be mentioned. These rubbers can be dissolved in a solvent such as toluene to form a solution. It is desirable to immerse the glass fibers to which the solid lubricant is attached in a rubber solution having a concentration of about 0.5 to 10% by weight. In this way, the rubber is attached to the glass fibers. The amount of rubber adhered is preferably about 0.5 to 10 weight percent.

Alternatively, glass fibers coated with a solid lubricant can be treated by immersing them in a liquid resin made by dissolving a thermosetting resin such as cashew resin, melamine resin, or phenolic resin in a diluting solvent such as methanol, water, or toluene. can. 0.
It is desirable to immerse glass fibers with a solid lubricant attached thereto in a liquid resin having a concentration of about 5 to 30% by weight. In this way, the liquid resin is attached to the glass fibers. The amount of resin deposited is preferably about 0.5 to 30% by weight. Even when asbestos fibers are used as a base material, it is desirable to carry out the above treatment in the same way as glass fibers. This treatment for 0-asbestos fibers is a conventional pretreatment. , and can use commonly used operations. Note that the above-mentioned fibers other than the stone wire fibers can also be subjected to the same pretreatment.

The glass fibers treated as described above or the glass fibers and other fibers are used as base fibers and processed into yarns, tapes, rovings, cloths, etc.

Next, a paste filler is added to the obtained base fiber processed product.
After applying pressure, measure the amount of adhesion through a nozzle and dry. The amount of paste filler attached after drying is 20% to 8
The paste filler, which is preferably about 0%, is used in normal clutch facing manufacturing operations, and is suitable for rubber materials such as synthetic rubbers such as styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), natural rubbers, and thermosetting rubbers. Resin such as phenolic resin, melamine resin, curing agent such as hexamine, vulcanizing agent such as sulfur, vulcanization accelerator such as DM, inorganic short fiber such as asbestos, friction: A
It consists of a conditioner such as cashew dust, a lubricant such as graphite, and a solvent such as toluene. In order to maintain stable productivity and anti-failure properties, the paste filler has a ratio of rubber material to thermosetting resin of 10% to thermosetting resin.
It is preferable that 40 to 200 parts by weight of rubber material is blended into the pasty filler.Furthermore, inorganic fibers such as asbestos, rock wool, glass-combined ceramic fibers, or Organic fibers such as aromatic polyamide fibers, bulbs, and rayon are added.

The paste-like filler-adhered base fiber processed product thus obtained is molded into a laminate using a conventional method such as a cross-winding method.
It is preformed using a helical winding method, etc., and then put into a mold and rolled under a pressure of 100 to 200 kgr/cm2.
It is molded by heating and compression under a temperature condition of ~200°C. The compact can then be post-fired at 150-200° C. for 3-15 hours and then polished to form a clutch facing product.

Example 1: Asbestos fibers were treated with 10% liquid phenol resin, one of the glass fibers was immersed in a liquid of solid lubricant (graphite) dispersed in water, and dried. After the weight percent was deposited, it was treated with 8% liquid phenol resin, and the obtained roving-like asbestos fibers and glass fibers were used as base fibers.

A paste-like filler having the blending ratio shown below was attached to this base fiber.

Inorganic short fiber (asbestos 60.04) 5% by weight Rubber (NBR) 15% by weight Resin (
Phenol: PR51778/Sumitomo Durets) 25% by weight Hardening agent (hexamine) 1% by weight Vulcanizing agent (sulfur) 9-layer J! T? 6 Friction modifier (cashew dust: 8203-cashew stock) 5
Weight% Lubricant (graphite) 5% by weight Inorganic filler 351! if% At this time, the ratio of the paste filler to the base material m fiber is approximately 1 in terms of heavy violet ratio.
: Adjusted to 1.

After attaching the paste filler, a preform was obtained by cross-winding, further molded at 150° C. and 150 kyf/cm 2 , and then post-fired at 170° C. for 5 hours and polished to obtain a clutch facing.

The performance of the obtained clutch facings is shown in Table 1 below.

Oiyokutsuki-L Two glass fibers were used as the base fibers, and after adhering 0.5% by weight of graphite as a solid lubricant to both glass fibers by the same operation as in Example 1, 3% A clutch facing was obtained by applying the same paste filler as in Example 1 to the obtained roving-shaped glass fibers and following the same operations as in Example 1.

The performance of the obtained clutch facings is shown in Table 1 below.

The asbestos fibers were treated with 10% liquid phenolic resin, and one of the glass fibers was treated with 8% liquid phenolic resin without adhering a solid lubricant, resulting in roving-like asbestos fibers and glass fibers. A paste-like filler similar to that in Example 1 was applied to the clutch, and a clutch facing was obtained by the same operations as in Example 1. The performance of the obtained clutch facings is shown in Table 1 below.

Similar to Example 2, two glass fibers were used as base fibers and treated with 3% liquid phenol resin without adhering solid lubricant, resulting in a low pink glass. A paste filler similar to that in Example 1 was attached to the fibers, and a clutch facing was obtained by the same operations as in Example 1.

[Effects of the Invention] The clutch facings produced by the method of the present invention have a solid lubricant attached to the surface of the glass fiber used as the base fiber, and as a result, the performance of the obtained clutch facing is as follows. You can get an effect like this.

Since the lubricity of the glass fiber surface is destroyed, stable friction performance is continuously obtained, and there is no squealing when the clutch is activated, and there is no negative effect on the parts around the clutch, and the squealing noise does not cause discomfort to the driver. This also eliminates the problem of running problems.

Claims (1)

[Claims] The base fiber is impregnated with a thermosetting resin or a rubber material or a mixture of a thermosetting resin and a rubber material, and then a pasty filler containing a thermosetting resin or a mixture of a thermosetting resin and a rubber material is attached. In the clutch facing manufacturing method, which comprises preforming the obtained base fibers into a laminate shape, heating and compressing the obtained preform, and post-sintering, a solid lubricant is used at least as the base fibers. A method for manufacturing a clutch facing characterized by using attached glass fiber.