JPH0518421A - Manufacture of moved plate member of clutch - Google Patents

Abstract

PURPOSE:To make flat the moved plate member of a clutch and stabilize motion of the moved plate member by constructing the clutch in a double structure from a backup member of light alloy and a friction material, making the roller on the backup member side with a dia. greater than that of the roller on the friction disc side, permitting to pass between the two rollers, and thereby eliminating possible warp of the moved plate member of the clutch. CONSTITUTION:The moved plate member 1 of a clutch is embodied in a ring form, and a friction material 3 is placed on a backup member 2 made of Al allow and they are heat shaped as in a single piece, through which a bending moment is given, and they undergo plastic deformation. Thus the intended shape is achieved. The warp produced at the time of heat shaping is corrected by passing the material between a plurality of roller couples 4, 5, upper and lower. Therein the backup member 2 is deformed plastically while the friction material 3 is formed elastically, and therefore, the backup member 2 must be deformed effectively. Therefore, the dia. of the roller 5 on the backup member 2 side shall be formed greater by an amount corresponding to the thickness of the friction material 3 than the dia. of the roller 4 on the friction material 3 side. This eliminates possible warp of the moved plate member 1 of the clutch to achieve its flatness, nullifies dislocation of rivet boring, and enables uniform polishing. Thus a stable moved plate member 1 can be fabricated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a clutch driven plate used for a clutch disc of a dry clutch.

[0002]

2. Description of the Related Art Conventionally, a method for manufacturing a clutch driven plate for an automobile has been based on long fibers such as asbestos and glass fiber or a string as a fiber base material, and a thermosetting resin, a rubber material, and other friction modifiers on the fiber base material. It was impregnated with the above materials, wound in an annular shape, preformed, and then thermocompression-molded. On the other hand, JP-A-61
As disclosed in Japanese Laid-Open Patent Publication No. 41022 and Japanese Patent Laid-Open No. 61-70225, a resin mold clutch facing plate made of asbestos non-woven fabric, a thermosetting resin and a friction modifier is used for aluminum, duralumin, magnesium, etc. There is also known a method of manufacturing a clutch driven plate which is mounted on a backup material made of the above light alloy and integrally thermocompressed. Compared with the above-mentioned manufacturing method, this clutch driven plate manufacturing method does not have a step of impregnating a fiber base material with a binder or a friction modifier and a step of winding the tablet on a tablet for preforming, and thus time and processing cost can be saved. Further, since the clutch driven plate has stable quality and is reinforced by the backup material, the rotational strength of the clutch driven plate can be increased.

[0003]

However, the clutch driven plate produced by the above-mentioned manufacturing method has a thermal expansion coefficient due to the difference in the thermal expansion coefficient between the backup material and the friction material and the curing shrinkage of the binder of the friction material. There is a problem that the clutch driven plate warps in the process of pressure forming. Therefore, only the part where the rivet hole position shifts when machining the hole for riveting the clutch driven plate to the cushion spring of the dry clutch, or when the clutch driven plate is warped when polishing to the specified thickness There was a problem that it could not be scraped off so much that the entire thickness was uniform.

[0004]

The present invention has been made in view of the above problems, and a friction material composed of a fiber base material, an organic binder and a filler is placed on a backup material made of a light alloy. In the manufacturing method of the clutch driven plate of the double-layer structure, in which the backup material is subjected to thermo-compression molding and bending strain is applied to the backup material to correct the warp generated in the thermo-compression molding process, the correction method is the upper and lower rollers. This is a method of correcting the bending strain by passing it through a clutch driven plate in between, and is characterized in that the strain given from the backup material side is smaller than the strain given from the friction material.

More specifically, the backup material of the present invention is a light alloy having a specific gravity of 5 or less, such as aluminum, duralumin, and magnesium, which is easily plastically deformed by applying bending strain. The surface of the light metal plate to be joined to the friction material is roughened by shot blasting, buffing, chemical etching, etc., and an epoxy resin-based, phenolic resin-based, nitrile rubber-modified phenolic resin-based adhesive or the like is applied.

The friction material of the present invention comprises a fiber base material generally used for friction materials such as asbestos, glass fiber, aramid fiber, carbon fiber, ceramic fiber and metal fiber, and thermosetting resin such as melamine resin and phenol resin. , NBR,
A commonly used organic binder such as rubber material such as SBR,
It may be blended with a friction modifier generally used for friction materials such as cashew dust, graphite, barium sulfate, clay, calcium carbonate, aluminum powder, copper powder, zinc powder and the like. Then, in order to integrally thermocompress the backup material and the friction material, the molding temperature is 120 ° C. to 200 ° C. and the surface pressure is 5
It is advisable to carry out under conditions of 0 kg / cm ^{2 to} 600 kg / cm ² .

Next, the warp correction of the molded clutch driven plate will be described. FIG. 2 shows the correction method of the present invention. This method is a method in which a clutch driven plate is passed between a plurality of upper and lower rollers to correct the bending distortion.
The amount of strain is set to be the largest on the roller inlet side and less on the outlet side. Then, the strain applied from the backup material side is made smaller than the strain applied from the friction material side. For that purpose, the diameter of the backup material side roller is made smaller than the diameter of the friction material side roller as shown in FIG.

The clutch driven plate flattened by this method is riveted and the friction material is polished to a predetermined thickness.
Next, in order to perform after-cure of the friction material, 200 ℃
Heat treatment is performed at a temperature of 300 ° C. to 300 ° C. At this time, a warp occurs due to the hardening of the friction material again, but it is advisable to perform the correction in the same manner as the above method. By the above method, a flat clutch driven plate can be obtained.

[0009]

When the roller straightening method of the present invention is used, the light alloy plate of the backup material is plastically deformed, and the clutch driven plate can be straightened by the plastic deformation. The principle of correction by rollers is described in the literature by Fumio Hibino: Plasticity and Machining, 2 (166
1) 357, that is, as shown in FIG. 3, the roller is bent into irregularities and is corrected while applying tensile strain and compression strain. The amount of distortion is set so that it is the largest on the roller entrance side and becomes smaller as it goes to the exit side. By doing so, the residual stress is subdivided and the plate can be flattened as shown in FIG.
By the way, in the case of the clutch driven plate, since the friction material is elastically deformed and the backup material is plastically deformed in a two-layer structure of the friction material and the backup material, the backup material must be effectively deformed.

FIG. 4 shows the clutch driven plate (a) when the friction material side roller diameter and the backup material side roller diameter are the same.
A model in which the backup material side is convex (b) and the backup material side is concave is shown. The deformation of the clutch driven plate is symmetrical with respect to (a) and (b). However, focusing on the backup material that undergoes plastic deformation, considering this deformation, the deformation with the concave backup material side has a smaller radius of curvature than the deformation with the convex backup material side. Therefore (R ₀₁ > R ₀₂ ), the backup material side is concavely plastically deformed.

FIG. 5 shows a deformation of the clutch driven plate when the backup material side roller diameter is made larger than the friction material side roller diameter by the thickness of the friction material, in which (a) the backup material side is convex (b) the backup material side. A model of concave deformation is shown. The deformation of the clutch driven plate is larger in (a).
However, considering this deformation by paying attention to the plastically deformable backup material, the radius of curvature of the deformation is almost the same (R ₁₁
= R _12). Therefore, by increasing the roller radius on the side of the backup material by the thickness of the friction material, it is possible to apply plastic deformation as in the case where the backup material has no friction material. Then, the clutch driven plate can be flattened by passing between the rollers having the roller diameters according to the above method. afterwards,
If rivet hole processing and polishing processing are performed, the rivet hole position can be accurately set and the friction material can be uniformly polished.

[0012]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a perspective view of a clutch driven plate according to the present invention. The clutch driven plate 1 has an inner diameter of 130 mm and an outer diameter of 2.
It has a ring shape of 00 mm and a thickness of 3.5 mm. Then, the clutch driven plate is formed by placing a friction material 3 composed of a fiber base material, a binder, and a positive value adjusting agent on a 1 mm backup material 2 made of an aluminum alloy, integrally thermocompressing the plastic material, and applying a bending moment. It has been transformed. The clutch driven plate 1 is used by riveting a backup material 2 toward both sides of a cushion spring of a dry clutch (not shown) with the backup material 2 facing the cushion spring.

The backup material 2 was punched out in a ring shape from a 1 mm aluminum alloy plate, and the joint surface with the friction material 3 was chemically etched with hydrochloric acid. Then, a phenol resin adhesive was applied to the joint surface with the friction material 3. Friction material 3
Is 17 parts of glass fiber, Kevlar 29 (aramid fiber:
DuPont trade name) 3 parts, NBR and vulcanizing agent 25
Parts, carbon, cashew dust, barium sulfate and the like were mixed and the mixture was mixed using a Henschel mixer.

Next, the friction material 3 was placed on the backup material 2 and integrally thermoformed. Molding conditions are temperature 150
° C., and a surface pressure of 200kg / cm ^2, 15 minutes. The formed clutch driven plate has a thickness of 4.3 mm and a warp of about 0.
It was 8 mm.

Warping was corrected by the method shown in FIG.
The roller radius was 20 mm on the friction material side and 22.8 mm on the backup material side. There were 5 rollers on the friction material side and 6 rollers on the backup material side. The roller was set so that the distortion amount was about 3 mm on the roller inlet side and about 0.5 mm on the outlet side. While changing the direction of the clutch driven plate, the roller was passed several times to correct it. As a result, the warp of the clutch driven plate was about 0.1 mm or less, and it could be within a range where there was no problem in polishing and rivet hole processing.

Then, a rivet hole is drilled at a predetermined position with a drilling machine, and a belt polishing machine is used to obtain a thickness of 3.55.
Polished to mm. The clutch driven plate after polishing was heat-treated in a high-temperature furnace at 230 ° C. for 5 hours to perform after-curing. At this time, pressure was applied from both sides so that the warpage due to curing would not increase. Since the clutch driven plate after after-curing had warped about 1.2 mm, it was corrected by a method similar to the above method.

[0017]

As described above, in the method for manufacturing the clutch driven plate according to the present invention, since the clutch driven plate having the two-layer structure is corrected by the rollers having different roller diameters, the clutch driven plate can be made flat. There is no rivet hole misalignment and it can be ground uniformly. Therefore, a flat and stable clutch driven plate can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a clutch driven plate according to the present invention.

FIG. 2 is a schematic side view showing a method for correcting a clutch driven plate according to the present invention.

FIG. 3 is a principle diagram showing a method for correcting a clutch driven plate.

4A and 4B are principle diagrams showing a method for correcting a clutch driven plate.

5A and 5B are principle views showing a method for correcting a clutch driven plate.

[Explanation of symbols]

1 Clutch driven plate 2 Backup material 3 Friction material 4 Friction material side roller 5 Backup material side roller

Claims (2)

[Claims] 1. A backup material made of a light alloy, a fiber base material,
Friction material consisting of organic binder and filler is placed and thermo-formed integrally, and further bending stress is applied to the backup material to correct the warpage generated in the hot-press forming process. In the manufacturing method, the straightening method is a method in which the clutch driven plate is passed between the upper and lower rollers and straightening is performed while giving bending strain, and the strain given from the backup material side is more than the strain given from the friction material. A method for manufacturing a clutch driven plate characterized by being small. 2. A method for straightening a bending strain is a method of passing a clutch driven plate between a plurality of upper and lower rollers.
2. The method of manufacturing a clutch driven plate according to claim 1, wherein a roller whose roll radius on the friction material side is smaller than the roll radius on the backup material side by the thickness of the friction material is used.