JPH0715298B2 - Method for manufacturing clutch driven plate - Google Patents

Description

The present invention relates to a method for manufacturing a clutch driven plate mainly used for a clutch disc of a dry clutch.

(Prior Art) Conventionally, a method for manufacturing a clutch driven plate for an automobile has used long fibers such as asbestos and glass fiber as a fiber base material, and the fiber base material is provided with a thermosetting resin, a rubber material, a friction modifier, etc. Was impregnated with it, wound in an annular shape for preforming, and then subjected to heat and pressure forming, after-cure, deburring, polishing and other finishing to form a woven clutch driven plate.

On the other hand, as disclosed in JP-A-61-41022 and JP-A-61-70225, a resin mold clutch facing plate composed of a non-woven fabric of asbestos, a thermosetting resin and a friction modifier is used for aluminum. Also known is a method of manufacturing a clutch driven plate that is mounted on a backup material made of a light alloy such as duralumin or magnesium and integrally thermoformed. Compared with the woven clutch driven plate manufacturing method, this clutch driven plate manufacturing method saves time and processing costs because there is no process of impregnating the fiber base material with a binder or friction modifier or winding it into a tablet for preforming. it can. Further, this clutch driven plate generally has stable quality as compared with the woven clutch driven plate, and since the strength is reinforced by the backup material, the breaking rotational speed is high.

(Problems to be solved by the invention) However, the clutch driven plate made by the above-mentioned manufacturing method, due to the difference in the thermal expansion coefficient of the backup material and the clutch facing member, and the curing shrinkage of the binder of the clutch facing member, The clutch driven plate warps in the process of integrally thermoforming.

Therefore, when riveting the clutch facing to the cushion spring of the dry clutch, the position of the rivet hole shifts, or the flywheel hits only a part of the clutch facing member when it is attached to the dry clutch for use. There was the inconvenience of uneven wear.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and includes a backup material made of a light alloy, a fiber base material and a binder,
When a clutch facing member made of a friction modifier is placed and integrally thermoformed, tensile stress is left on the joint surface of the backup material during the thermocompression molding process, and then a bending moment is applied to the backup material to provide plasticity. It is characterized by being deformed.

More specifically, the backup material of the present invention is a ring-shaped plate made of a light metal having a specific gravity of 5 or less, such as aluminum, duralumin, and magnesium, and has a surface to be a joint surface with a clutch facing member. Since it is coated with an epoxy-based, phenol-based, nitrile-phenol-based, etc. adhesive, it is roughened by shot blasting or buffing.

Further, the clutch facing member used in the present invention is a fiber base material generally used for friction materials such as asbestos, glass fiber, aramid fiber, carbon fiber, ceramic fiber, metal fiber, and thermosetting resin such as melamine resin and phenol resin. Binders commonly used for friction materials such as resins and rubber materials such as NBR and SBR, and friction materials such as cashew dust, friction dust, graphite, barium sulfate, clay, calcium carbonate, aluminum powder, copper powder, zinc powder Can be blended with the friction modifier used in.

Then, in order to place the clutch facing member on the backup material and perform thermocompression molding integrally, the molding temperature of 80 ° C or
Make sure that the tensile stress remains on the joint surface of the backup material under the conditions of 300 ° C and surface pressure of 50 kg / cm ² to 600 kg / cm ² .
It is advisable to integrally perform thermocompression molding using a mold as shown in FIG. When a clutch facing member having a coefficient of thermal expansion smaller than that of the backup material is used, the molding temperature of the clutch facing member is 80 ° C to 300 ° C,
Molded into the same ring shape as the clutch driven plate at a surface pressure of 50 kg / cm ² to 600 kg / cm ² , and then placed on a backup material coated with adhesive, molding temperature 80 ° C to 300 ° C, surface pressure 1
By using the means for integrally thermocompressing at 0 kg / cm ² to 200 kg / cm ² , the difference in thermal expansion coefficient between the backup material and the clutch facing member can be used while using the mold normally used for resin mold clutch facing. This is preferable because tensile stress can be left on the joint surface of the backup material.

Further, when a clutch facing member having a sum of curing shrinkage and thermal expansion coefficient smaller than the thermal expansion coefficient of the backup material is used, the clutch facing member having the above composition is formed into a powder form or at room temperature into the same ring shape as the clutch driven plate. Place on the backup material stored in the mold and clamp the mold, molding temperature 80 ℃ to 300 ℃, surface pressure 50k
By using the means for integrally thermoforming at g / cm ² or 600 kg / cm ² , the difference between the coefficient of thermal expansion of the backup material and the sum of the coefficient of thermal expansion of the clutch facing member and the curing shrinkage factor causes This is most preferable because the tensile stress remains in and the time can be saved.

Next, the method of applying a bending moment to the backup material to cause plastic deformation is as shown in FIG. 5, in the same manner as the three-point bending, with the backup material facing down and the clutch driven plate placed on the lower fulcrums 8a and 8b. It is also possible to use a method in which the clutch driven plate is rotated while intermittently applying a force to the upper fulcrum 9 and is continued until the clutch driven plate becomes flat.
As shown in the figure, place the clutch driven plate on the two lower rolls 6a and 6b so that the backup material is on the lower side, press the clutch driven plate with the upper roll 7 from above, and rotate the rolls. When a bending moment is applied to the clutch driven plate, the whole is uniformly plastically deformed, which is most preferable.

(Operation) Since the present invention applies a bending moment to the light alloy backup material to cause plastic deformation, the clutch driven plate becomes flat, and when assembled into a dry clutch, the displacement of the rivet hole position due to warpage or the dry clutch. It is possible to prevent uneven wear due to warpage during use.

Further, in the present invention, when a fiber base material, a binder, a clutch facing member such as a friction modifier is placed on a backup material of a light alloy and thermocompression-molded integrally, the tensile stress remains on the joint surface of the backup material. As shown in Fig. 3, since the backup material is placed in a convex state with the backup material facing downward, when the backup material is plastically deformed by applying a bending moment to flatten the clutch driven plate, compressive stress is applied to the clutch facing member. The problem that the clutch facing member is pulled and cracked during plastic deformation of the backup material does not occur.

(Examples) Examples of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows a perspective view of a clutch driven plate according to the present invention. The clutch driven plate 1 of the embodiment has an inner diameter of 130 mm and an outer diameter of 200 m.
It has a ring shape of m and a thickness of 3.5 mm. A clutch facing member 3 composed of a fiber base material, a binder, and a friction modifier is placed on a ring-shaped backup material 2 made of an aluminum alloy, thermoformed integrally, and subjected to a plastic deformation by giving a bending moment. is there. 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.

First, the backup material 2 is molded. The backup material 2 is punched out in a ring shape from an aluminum alloy plate having a thickness of 1 mm by a punching press machine. Next, the surface of the backup material 2 to be joined to the clutch facing member 3 is roughened by polishing and the surface is washed with an alkaline degreasing agent.
Subsequently, a phenol resin adhesive is applied to the surface thereof, and the adhesive is placed in the groove of the molding die 4 shown in FIG. 2 so that the applied surface is located on the upper surface.

Next, the clutch facing member 3 is formed. In other words, 10 parts of bulk Kevlar 29 (aramid fiber, DuPont trade name) that is a fiber base material, 10 parts of glass fiber, 25 parts of melamine resin that is a binder, balances such as cashew dust and magnesium carbonate that are friction modifiers, Blend and mix using Henschel.

Thereafter, the clutch facing member 3 is placed in the groove of the molding die 4 shown in FIG. As a result, the clutch facing member 3 is placed on the upper surface of the backup material 2. In this state, mold die 5 is clamped, temperature 150 ℃, surface pressure 200kg.
Thermocompression molding under the condition of / cm ² . After that, the clutch driven plate 1
Is heat-treated at 200 ° C. for curing and aging. Further, the clutch facing member 3 is polished to make the clutch driven plate 1 having a thickness of 3.5 mm. The clutch driven plate manufactured in this manner has the shape shown in FIG. 3 because tensile stress is generated in the joint surface of the backup material.

Next, as shown in FIG. 4, a clutch driven plate was placed on the lower roll and the upper roll was fixed so that the distance between the upper roll and the lower roll was 2.5 mm.

Next, the lower rolls 6a and 6b were rotated, and when the clutch driven plate rotated about 10 times, the upper roll 7 was lifted and the driven plate 1 was taken out.

The clutch driven plate 1 thus formed was a flat clutch driven plate without cracks in the clutch facing member 3.

(Effects of the Invention) As described above, in the method for manufacturing the clutch driven plate according to the present invention, the clutch facing member made of the fiber base material, the binder, the friction modifier and the like is placed on the backup material made of the light alloy. Then, when integrally thermoforming, the tensile stress is left on the backup material side in the thermoforming process, and then the backup material is plastically deformed by applying a bending moment, so there is no warp and cracks on the clutch facing surface. It is possible to obtain a good clutch driven plate having no

[Brief description of drawings]

FIG. 1 is a perspective view of a clutch driven plate, FIG. 2 is a partial sectional view of a mold for the clutch driven plate, FIG. 3 is a sectional view of the clutch driven plate, and FIGS. 4 and 5 show bending moments. FIG. 6 is a partial cross-sectional view of a forming die for the clutch driven plate, which is a principle view of the method of plastic working. Explanation of reference numerals 1 ... Clutch driven plate, 2 ... Backup material 3 ... Clutch facing member 4 ... Mold, 5 ... Mold 6a, 6b ... Lower roll, 7 ... Upper roll 8a, 6b. Lower fulcrum, 9 …… Upper fulcrum 10 …… Molding die, 11 …… Molding die

Claims (4)

[Claims] 1. A backup material made of a light alloy, on which a clutch facing member composed of a fiber base material, a binder, a friction modifier, etc. is placed and thermocompressed integrally, the backup material of the backup material is formed during the thermocompression molding process. A method for manufacturing a clutch driven plate in which tensile stress is left on the joint surface side with a clutch facing member, and then a bending moment is applied to the backup material to cause plastic deformation. 2. The method for producing a clutch driven plate according to claim 1, wherein the method of leaving the tensile stress uses a clutch facing member having a coefficient of thermal expansion smaller than that of the backup material. 3. A method of remaining tensile stress is characterized by a thermal expansion coefficient and a hardening shrinkage rate. 3. The method for manufacturing a clutch driven plate according to claim 2, wherein a clutch facing member having a sum of the above is smaller than the coefficient of thermal expansion of the backup material is used. 4. A method for applying a bending moment is such that a backup material for a clutch driven plate is placed on two rolls so that the backup material is downward and a roll is used to press the clutch driven plate to rotate the rolls to drive the clutch. The method for manufacturing a clutch driven plate according to claim 1, wherein a bending moment is applied to the plate.