JPS5934897B2 - friction plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction plate used in a wet multi-plate clutch of an automatic transmission, etc. The invention relates to a friction plate.

The facings provided on conventional friction plates are manufactured by impregnating a paper-like base material made of cellulose and inorganic fillers with a thermosetting resin such as phenolic resin, and then hardening this resin by heat treatment. has been done.

However, when this acing is used under conditions where a large surface pressure is applied, a so-called buckling phenomenon may occur and it may be destroyed.

This buckling can be prevented by increasing the hardness by increasing the impregnation ratio of the resin contained in the facing, but there is a drawback that as the hardness increases, the original frictional performance decreases.

The present invention provides a friction plate that can effectively prevent buckling without reducing friction performance by making the resin impregnation rate higher in the peripheral edge of the facing than in other parts. It is an object.

Next, an embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 indicates a ring-shaped core metal used in a wet multi-disc clutch of an automatic transmission for automobiles, and by providing facings 2 on both sides of this core metal 1, a friction plate can be formed. It is configured.

Each facing 2 consists of a ring-shaped low impregnation part 2a arranged near the axis of the core metal 1 and a ring-shaped high impregnation part 2b arranged outside the ring-shaped part 2a.

In this example, the low impregnated area 2a and the highly impregnated area 2b are formed by impregnating a paper-like base material punched into a predetermined shape with a thermosetting resin, and aligning it with the core metal 1 coated with a thermosetting adhesive. They are the same in that they are formed by a subsequent heat treatment process, but they differ in that the highly impregnated part 2b contains a higher proportion of resin than the low impregnated part 2a.

Facings 2 with different resin impregnation rates are made by aligning a base material uniformly impregnated with resin to the core bar 1, and then removing only the peripheral portion, which should become the highly impregnated portion 2b, as shown in Fig. 3. It can also be obtained by immersing it in resin liquid 3 and then heat-treating it.

According to the experimental results, Facing 2, in which only the peripheral edge contains a higher proportion of resin than the other parts, has approximately the same frictional performance as one that contains resin in a uniform proportion. It was confirmed that the material had extremely high resistance to buckling failure.

Two types of samples based on the present invention and a comparative sample without the highly impregnated portion 2b were prepared, and the results of tests on high surface pressure durability and friction performance are shown below.

(Sample 1) A paper-like sheet obtained by making paper using a normal method from a dispersion of linter pulp and an inorganic filler in water is punched out to form a low impregnation area 2a and a high impregnation area 2b, respectively. Two types of ring-shaped base materials were prepared, and each base material was impregnated with a phenolic resin solution common in this field at a predetermined ratio, and then dried and heat-treated.

Next, this impregnated sheet was fitted onto a metal core and thermoformed according to a conventional method to obtain a friction plate.

The resin impregnation rates for the base material corresponding to the low impregnation area 2a and the high impregnation area 2b are 30% and 38% by dry weight, respectively.
%Met.

(Sample 2) The resin impregnation rate for the base material corresponding to the highly impregnated part 2b was set to 42
It was prepared by performing the same operation except that it was made into %.

(Comparative sample) A sample was prepared by performing the same operation except that the resin impregnation rates of the base materials corresponding to the low impregnation area 2a and the high impregnation area 2b were both set to 30%.

Test 1 1 Average surface pressure 60 for sample 1.2 and comparative sample
kg/c4. A high surface pressure durability test was conducted under the conditions of an oil temperature of 120°C and a cycle of 30 seconds.

The number of times until buckling failure of the facing was as follows.

Sample 1: 67,000 ~ Sample 2: 88,000 ~ Comparative sample: To 21,000 Test 2 Samples 1.2 and the comparative sample were installed in an automatic transmission, and the rotational inertia mass 2 was measured at an oil temperature of 120°C and a cycle of 30 seconds.
．． Pressing load 31 with rotational energy (approximately 1786kg・m) of 52kg・mine・5ec2, rotation speed 360 orpm
The wear amount and dynamic friction coefficient of each sample were measured by applying 3 kg to the friction plate to brake and stop the sample.

The measurement results are shown in Table 1 below.

As described above, in the friction plate of the present invention, since the amount of resin impregnated in the facing is increased only at the peripheral edge, the friction plate as a whole maintains friction performance comparable to conventional ones.
Durability against buckling fracture has been significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a front view of a friction plate according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 shows an impregnation process for obtaining the friction plate of the present invention. It is an explanatory diagram. 1...Core metal, 2...Facing, 2
a...Low impregnation part, 2b...High impregnation part,
3...Resin liquid.

Claims (1)

[Claims] 1 Consists of a ring-shaped core metal and ring-shaped facings provided on both sides of the core metal, and each facing is
A friction plate characterized in that its outer peripheral edge has a highly impregnated part containing a resin at a higher proportion than other parts.