JPS597002A - Cork friction material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention provides cork with almost no damage to its M1 detecting properties.
Moreover, it relates to a roux 1 oil that significantly improves abrasion resistance and increases oil leaching.

Conventionally, Nr-, which is made by crushing cork that has the excellent characteristics of natural products, especially its excellent coefficient of friction, has been compressed and bonded with an adhesive to make friction plates.
It was often used for knee songs, pre-knees, etc. However, cork has low physical strength, and has drawbacks such as squeaking noise when the clutch or brake is activated, a strange odor due to frictional heat, and abnormal wear caused by a partially engaged clutch, resulting in low f6θ.

Therefore, as a method to solve this problem, oil is impregnated into the intergranular spaces of a cork friction material made by integrally molding cork particles with an adhesive to improve wear resistance. As the adhesive agent used was phenolic resin, urea resin, vinyl acetate Md resin, etc., and the cork particles were compressed and bonded, there were very few voids between the cork particles and the adhesive. Even if the material is impregnated with hI by heating or pressurized impregnation, the amount of oil impregnated is extremely small at less than 10%, and the desired wear resistance (1) cannot be obtained much. , and oil impregnation is concentrated on the surface of the friction 44, and during long-term use, the surface nl!
The problem was that the oil was removed and only a small amount of oil remained, resulting in a significantly lower wear resistance.

Therefore, as a method to increase the amount of oil impregnated, cork grains and oil are mixed and stirred in advance.
A method was devised in which a cork friction material was obtained by adding oil to the material, mixing it with a phenolic adhesive, stirring it, putting it in a mold, and fixing it in one piece. However, the amount of oil impregnated in this material is slightly higher than that of the cork friction material mentioned above, but it does not affect the adhesion of the adhesive. Under severe conditions such as clutch facing and pre-kneeling, the cork polishing will be destroyed, and the agitation of cork particles, oil, and adhesive will take a long time. In addition, there were disadvantages such as problems with uniform stirring and strength.

The present invention eliminates these drawbacks and improves the working efficiency by applying oil-impregnated cork friction material not only to the surface area but also to the center area. It provides:

The present invention is a cork friction material obtained by integrally molding cork particles of appropriate size, substantially 10 to 80 m thick, using an adhesive using a conventional method, and a cork friction material obtained by adding oil (vegetable oil, mineral oil, etc.) to the cork friction material. This is a cork friction material impregnated with (but not limited to) a urethane-based adhesive.

The use of a urethane adhesive as a binder in the cork friction material of the present invention means that when the cork friction material using the urethane adhesive is immersed in an oil bath or impregnated under vacuum or pressure, the oil will be absorbed into the cork. Of course, the urethane lubricant itself is impregnated with a lot of oil, not only in the gaps between the grains and the adhesive, but also in the gaps between the particles and the adhesive. It is possible to easily obtain a cork friction material impregnated with oil with a weight ratio of 25 to 60% to the individual cork particles. Depending on the application, a weight ratio of 15 to 50% is appropriate, and the optimum weight ratio is 25 to 60%, but according to the present invention, it is possible to easily obtain a weight ratio of 25 to 60%.

In addition, if the cork friction material is affixed to metal substrates such as clutches and brakes in advance and then impregnated with oil, it can be used to create clutch facings and brake knees that have adhesive strength between cork and metal substrates and have excellent friction properties. It is also possible to easily obtain oJ.

Furthermore, since the cork friction material of the present invention gives priority to the bonding between the cork and the adhesive, even if it is impregnated with oil, the adhesive strength will not be impaired in the slightest.

Furthermore, in order to fully achieve the purpose of the present invention, fine particles E of a material having fine voids such as foamed urethane are pre-impregnated with oil into the fine voids, and then dispersed in the urethane adhesive. What if we include them together to form a cork friction material? 11i is uniformly impregnated with adhesive and has sufficient adhesive strength, so 7(
I get caught.

Of course, even if Rth7F- such as urethane foam is first dispersed to form a cork friction material, oil can be soaked into the fine voids of the fine particles P without any problem and the same effect can be obtained. It is something.

Next, the present invention will be explained by examples.

cork? , use 2r-30 to 70 meters,
Add urethane adhesive to the dirt and stir for 5 to 10 minutes.
The desired material is placed in a mold and allowed to shrink to harden the adhesive, and then taken out from the mold to obtain a cork friction material in the desired shape.

The obtained cork friction material was vacuum impregnated with turbine oil #200 for 1 hour at 3 mar 4 g 1" to obtain a cork friction material with a weight ratio of oil to cork grains of 288% by weight. 2 hours at Hgding, Tha Hin/ll #
200 was vacuum impregnated, a cork friction material having a weight ratio of oil to cork particles of 34.2% was obtained.

Therefore, adjust the vacuum impregnation time and pressure. 1
The impregnation amount of 11 is 0%, 5%, 15%, 20%, 25%,
Make cork friction materials of 30%, 65%, 45%, and 60% respectively.
σ)'' I had a few good ones like 7 rough.

In addition, next to oil is 111 or 60% or more 1. Field A can only be kept inside the shrine for more than 2 hours, and the oil will leak out into the shrine, so it is practically impossible to make one.

The friction coefficient in Table 1 is 711 even for children! The coefficient fl! :
'F is for rowing (in dispute, the friction characteristics are J (without 1,
And as shown in Table 2σ), the friction H711 due to the addition of 7111
It has been significantly reduced by 15% from the old one, and its effect is clearly visible. Due to the action of 7111 which has been considered, the friction coefficient can be greatly increased by 1-1- without decreasing the coefficient of friction, and the (J 6; of -1 Luk 1 + I/heating material can be maintained at Nagato). 1. Since the distribution of oil is uniform, the same effect can be obtained even with 414J, which could not be obtained by cutting 11 #j JII from a straight long cut, and using the conventional Jj method. It is an excellent J-LUC friction material that cannot be obtained.

[Brief explanation of the drawing]

Table 1 is a graph comparing the friction coefficients of the cork friction materials of the present invention. Table 2 is a graph comparing the wear 1.1' of the cork friction materials of the present invention. / N1 person for patent Fuji 1) Mata 3 Jakyoku ♂ Immersion Eating procedure amendment 1 Indication of case Patent application No. 116006 of 1988 2, Name of invention Cork friction material 3, Person who makes i'+li correction 5 Arrest A column for a detailed explanation of the invention, a column for a brief explanation of the drawings, and the drawings in the subject specification. 6h Lo, page 7, line 20 of the detailed description of contents [4. Brief explanation of the drawings] and page 8, lines 1 to 4f te, ``Table 1 compares the friction amount of this product. It is a graph.” is deleted. Table 1. and Table 2" are included at the end of the detailed description of the invention on page 8.

Claims (1)

[Scope of Claims] 1. A cork friction material formed by molding cork particles into a body through an adhesive and impregnating it with oil, wherein the adhesive is a urethane adhesive and the oil is A cork friction material characterized by a cork heavy storm ratio of 15-50%. 2. The urethane thread thinning agent according to claim 1, characterized in that fine particles of urethane foam or the like impregnated with oil are dispersed in the urethane adhesive. Cork friction material.