Friction material

Abstract

The purpose of the present invention is to provide a friction material which is used in a disc brake for an automobile or the like, is obtained by molding a friction material composition of an NAO material, and is capable of suppressing braking vibration during high-temperature braking. In order to achieve this purpose, a friction material obtained by molding a friction material composition comprising a binding material, a fiber base material, an organic friction adjusting material, an inorganic friction adjusting material, a lubricating material, and an NAO material that does not contain a copper component uses a friction material composition, the friction material composition contains a binder in an amount of 5-9% by weight relative to the total amount of the friction material composition, and also contains a silicone rubber-modified phenolic resin in an amount of 1-4% by weight relative to the total amount of the friction material composition as a part of the binder. The friction material composition further contains 1-4 wt% of cashew nut shell oil friction powder as an organic friction adjusting material and 0.5-3 wt% of fused silica having an average particle diameter of 15-40 [mu] m as an inorganic friction adjusting material relative to the total amount of the friction material composition. And electrofused zirconium silicate beads having an average particle diameter of 10-30 [mu] m in an amount of 0.1-2% by weight relative to the total amount of the friction material composition as an inorganic friction adjusting material.

Description

technical field [0001] The present invention provides a kind of friction material, which is used for disc brake pads. It is composed of NAO (Non- Asbestos-Organic: Friction material composition of asbestos-free (organic) material is molded. Background technique [0002] Conventionally, a disc brake is used as a brake device for a car, and a disc brake pad obtained by affixing a friction material to a metal base member is used as the friction member. [0003] Friction materials used in disc brake pads are mainly classified into the following three types. [0004] <Semi-Metallic Friction Material> [0005] A friction material containing 30% by weight or more and less than 60% by weight of steel fibers as a fiber base material relative to the total amount of the friction material composition. [0006] <Metal-less friction material> [0007] A friction material that contains steel fibers in a part of the fibrous base material and contains steel fibers in an amoun...

AI Technical Summary

Problems solved by technology

[0019] However, the friction materials described in Patent Documents 1 and 2 are so-called low-steel friction materials that contain steel fibers as the fiber base material, and there is a problem that wheel rust and brake noise are easily generated.

[0020] In Patent Document 3 etc., it is known that a friction material that does not contain steel fibers such as steel fibers or stainless steel fibers as a fiber base material, that is, a so-called NAO material friction material, wheel rust and brake noise in NAO material friction materials Although the occurrence of high-temperature braking is rare, there is no established means to solve the problem of brake vibration during high-temperature braking

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