JPS62113920A - Clutch facing - Google Patents

Abstract

PURPOSE:To improve the burst strength by disposing a string-like base material in a disc clutch facing in such a manner as to circulate around the inner peripheral edge portion thereof and the peripheral wall portion of a rivet hole. CONSTITUTION:String-like base materials 2 formed by a glass fiber are disposed in such a manner as to circulate around the inner peripheral edge portion 13 of a disc clutch facing 1 and the peripheral wall portion 12 of a rivet hole 11 and are stacked continuously from the surface to the back in a mold. Mixture of base material and binder is poured therein, and subjected to hot-forming at 170 deg.C under pressure of 110kg/cm<2> for three minutes. In case of the thus formed clutch facing 1, at a portion where string-like base materials 2 are disposed, fibers are disposed in the peripheral direction, so that the shearing stress can be improved, and the burst strength can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the improvement of clutch facings of clutch disks used in automobiles and the like that connect and disconnect power transmission, and in particular to the improvement of dry clutch facings with excellent burst strength. Regarding.

[Prior Art] In automobiles, clutch facings are used as parts of clutch discs that connect and disconnect power between an engine and a transmission. This clutch facing 1
generally has a donut shape as shown in Fig. 1, and is attached to both sides of the disc spring 4 as shown in Fig. 3, and is pressed against a mating member such as a pressure plate to transmit power. be.

This clutch facing is made of inorganic fibers such as asbestos, carbon fibers, and glass fibers, or fibers made by combining the inorganic TL navy blue with organic fibers such as polyamide fibers, a thermosetting resin as a binder, a rubber material, Resin mold type products are known, which are formed by mixing a vulcanizing agent, a friction modifier, etc., injecting the mixture into a mold, and heating and pressurizing the mixture.

Further, a base material made of the above-mentioned fibers in the shape of felt, mat, or woven fabric is used, and this base material is impregnated with a mixed solution of a binder such as a thermosetting resin, a rubber material, a vulcanizing agent, and a friction modifier. After cutting this into an appropriate shape and stacking it into a desired circular shape,
Woven products formed by heating and pressurizing,
In addition, semi-mold type fibers are formed by forming the above-mentioned fiber into a string, impregnating it with a mixed solution containing a binder, then winding it into a spiral or thermoid shape, molding it into a desired shape, and heating and pressurizing it. Things are also known.

[Problems to be Solved by the Invention] In attaching clutch facings to both sides of a disc spring, as shown in FIG.
This is achieved by inserting a metal rivet into a rivet hole 11 that coaxially communicates the clutch facing 1 and the disc spring 3 and caulking the metal rivet.

By the way, one of the measures for evaluating the performance of clutch facing is burst strength. The burst strength is determined by rotating the clutch facing at a high speed until it breaks while gradually increasing the number of rotations, and is determined by the number of rotations at that time, and it is determined that the larger the value, the better the strength. It is also generally known that during this burst strength test, stress concentration acts on the periphery of the rivet hole and the clutch facing, and that breakage occurs starting from the rivet hole and the periphery of the clutch facing.

Unlike other types of clutch facings, resin mold clutch facings are characterized in that the composition is almost uniform in all parts, so that constant friction characteristics can always be obtained. However, on the other hand,
Since the fibers do not have a certain orientation, there is a problem that the shear strength is low, and the burst strength is also low.

The present invention has been made in view of this problem, and it is an object of the present invention to provide a resin-molded clutch facing that has even higher burst strength.

[Means for Solving the Problems] The clutch facing of the present invention has a substantially disk shape and is mainly composed of a base material such as asbestos and a binder such as a thermosetting resin, and the clutch facing extends parallel to the axial direction. In a clutch facing that has rivet holes and can be attached to a mounting member such as a clutch spring through the rivet holes, at least one of the peripheral wall of the rivet hole and the peripheral edge of the clutch facing has a string-like base material. is provided around one of the peripheral wall portion and the peripheral edge portion.

The base material used in the clutch facing of the present invention is composed of inorganic fibers such as asbestos, carbon fiber, glass am, or composite fibers made by mixing these inorganic 4H materials with polyamide resin.

Further, a small amount of metal fiber or the like can also be used together.

As the binder, thermosetting resins such as phenolic resins, phenoxy resins, epoxy resins, and unsaturated polyester resins can be used.

Phenolic resin refers to a resin obtained by condensing one or more phenols such as phenol and cresol with formaldehyde or a compound that is a source thereof. Modified phenolic resins modified with cashew nut oil, polyvinyl butyral, vegetable oil, melamine, epoxy compounds, etc. may also be used. Note that unmodified phenol resin is good in terms of heat resistance.

Additionally, a relatively large amount of rubber is generally used in clutch facings together with a vulcanizing agent, but the amount can be selected depending on the composition ratio of raw materials, intended use, etc.

Other ingredients include sterile powders such as barium sulfate, diatomaceous earth, alumina, dolomite, calcium carbonate, calcium hydroxide, and graphite, organic powders such as cashew dust and rubber dust, and gold powders such as aluminum, iron, and zinc. Friction modifiers may also be used.

The most important feature of the present invention is that a string-like base material is provided in the clutch facing base at least one of the peripheral wall of the rivet hole and the peripheral edge of the clutch facing so as to extend around the peripheral wall and the peripheral edge of the clutch facing. It's where you are. Of course, it may be provided on both sides. Further, when the shape of the clutch facing is a donut shape having a center hole, the peripheral edge portion is selected from the inner peripheral edge portion and the outer peripheral edge portion.

In this case, it is preferable to provide a string-like base material at least on the inner peripheral edge. This is because if a crack occurs starting from a point on the inner peripheral edge, the crack will tend to grow toward the outer peripheral edge due to centrifugal force during rotation.

The string-like base material may be arranged, for example, in a part of the clutch facing surface layer, or may be arranged continuously in the axial direction from the front surface to the back surface. The burst strength improves as the amount of the string-like base material arranged increases, but if the amount is too large, it becomes difficult to obtain uniform friction characteristics, so it is preferable to set the amount to 5 to 3 QVO1% of the clutch facing base material.

The string-like base material may be made of inorganic fibers such as asbestos, carbon m\#, or glass II, composite fibers made by mixing these inorganic fibers with polyamide resin, or a small amount of metal fibers that constitute the base of the clutch facing. Fibers of the same type or different types can be used and can be obtained by making strings. Its diameter can be selected depending on the shape of the clutch facing and is not particularly limited.

A typical method of manufacturing the clutch facing of the present invention will be described below.

First, a fibrous base material and a mixed solution containing a binder are thoroughly mixed. Then, a separately prepared string-like base material is placed at a predetermined position in a mold, and the mixture is injected into the mold and molded under heat and pressure. As a result, the string-like base material is partially impregnated with the binder, and the string-like base material becomes integrally bonded and held with the clutch facing base. The clutch facing of the present invention can be easily manufactured in this way.

[Operations and Effects of the Invention 1] In the clutch facing of the present invention, a string-like base material is disposed around at least one of the peripheral wall of the rivet hole and the peripheral edge of the clutch facing. Therefore, in the area where the string-like base material is placed, the fibers are oriented in the circumferential direction, so the shear strength improves and burst strength is achieved.Also, most parts of the clutch facing The composition is similar to that of conventional products, and the uniform friction characteristics characteristic of resin mold systems are hardly lost.

[Example] The following is a concrete explanation using Examples. Note that the % described below means % by weight unless otherwise stated.

(Example) 25% of the base material made of glass fiber, 30% of the binder made of phenolic resin, 20% of calcium carbonate as a friction modifier, and 20% of metal powder (brass powder) were thoroughly mixed. In addition, using glass fiber, diameter 3III
A string-like base material was prepared by making a string in the form of III. Next, the above-mentioned string-shaped base material is stacked at a predetermined position in the mold so that it goes around the peripheral wall of the rivet hole and the inner peripheral edge of the donut-shaped clutch facing, and continues from the front surface to the back surface of the clutch facing. It was placed as follows. After injecting the mixture into the mold, the mixture was heated at 170°C and 110°C.
Thermoforming was carried out for 3 minutes at a pressure of kg/csu.

Rivet holes were drilled at predetermined positions in the obtained molded body to obtain a clutch facing. As shown in FIGS. 1 and 2, the obtained clutch facing 1 has a plurality of rivet holes 11 with an inner diameter of 6111R and an outer diameter of 224 mff1. It is a donut-shaped resin mold type clutch facing 1 with an inner diameter of 160 mm,
A cord-like base material 2 is disposed on the peripheral wall portion 12 and inner peripheral edge portion 13 of the rivet hole 11 and is integrally connected to the clutch facing base body.

(Conventional example) A clutch face sink of the conventional example was manufactured by using the same raw materials as in the example except for not arranging the string-like base material, thermoforming under the same conditions, and forming rivet holes in the same manner. .

(Evaluation) The tensile strength and burst strength in the radial direction were measured for each of the above two superior clutch facings. As a result, the tensile strength of the example was 3k (1/cn+
2. The weight of the conventional example was 2 kg/ca12, and the weight of the example was 1.5 times higher. In addition, the rotation speed at which the clutch facing broke in the burst test was 1200 orpm for the example and aooorpm for the conventional example, and the clutch facing of the example of the present invention had approximately 50% burst strength compared to the conventional one. It was improving.

It is clear that these results are due to the effect of arranging the string-like base material.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the clutch facing. FIG. 2 is a sectional view of a main part of the clutch facing of the embodiment of the present invention, taken along the line A--A in FIG. 1. FIG. 3 is a sectional view showing the state in which the clutch facing is attached to the clutch disk. 1... Clutch facing 11... Rivet hole 12... Peripheral wall portion 13 Inner peripheral edge portion 2...
・String-shaped base material 3...Clutch spring patent applicant Toyota Motor Corporation agent Patent attorney Hirodo Okawa Patent attorney Akio Maruyama Figure 1 Figure 3 Figure 2

Claims (3)

[Claims] (1) It has an approximately disk shape and is mainly composed of a base material such as asbestos and a binder such as a thermosetting resin, and has rivet holes that penetrate parallel to the axial direction, through which clutch springs, etc. can be attached. In a resin-molded clutch facing that can be attached to a member, a string-like base material is attached to at least one of the peripheral wall of the rivet hole and the peripheral edge of the clutch facing. A clutch facing characterized by being provided around one side. (2) The clutch facing according to claim 1, wherein the clutch facing has a substantially donut shape with a central hole in the center, and the string-like base material is provided along the inner peripheral edge. (3) The string-like base material is 5 to 3 of the clutch facing base material.
The clutch facing according to claim 1, wherein the clutch facing is provided so as to be 0 vol%.