Brakes – Elements – Cooling and lubricating
Patent
1991-12-20
1995-01-03
Oberleitner, Robert J.
Brakes
Elements
Cooling and lubricating
188251R, F16D 6900, F16D 6902
Patent
active
053777921
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a friction pad of a disc brake which is mounted on a vehicle, such as an automobile or a motorcycle.
2. Description of the Related Art
In a disc brake for controlling the action of a brake disc by a pair of friction pads, the brake disc is made of cast iron or a steel plate and the friction pads are made of a resin mold. Improvement in durability of the brake disc and the friction pads to a heat crack and fade, and their lightening in weight have been desired.
As disclosed in Japanese Unexamined Patent Publication No. 1-320328, for example, a carbon-carbon composite or a carbon-fiber reinforced carbon composite has been proposed as the materials for the brake disc and the friction pads.
Carbon fibers impregnated with a carbon matrix are subjected to carbonization and high densification treatment to provide the carbon-carbon composite. This composite has a great friction coefficient when combined with the same type of a material, and a small friction coefficient in a combination with a different type of a material. The carbon-carbon composite is therefore used for both the brake disc and the friction pads.
The carbon-carbon composite has a large friction coefficient in a high temperature range of about 100.degree. C. or higher, and has excellent heat resistance, thermal shock resistances, and heat conductivity. This composite however has a great wear by oxidation rate in such a high temperature range, so as to deteriorate the durability of the friction pads and easily transmit heat caused by a braking operation to a hydraulic system.
Further, since the carbon-carbon composite is hardly bonded or fusion-bonded to other materials, the entire friction pad is integrally formed of the carbon-carbon composite as disclosed in the Japanese publication (No. 1-320328). This type of friction pad is inferior in rigidity to those provided with metal back plates, and will therefore be deformed by the pressure of a piston, or impart a soft brake feeling to a driver. Also as the carbon-carbon composite has high heat conductivity, an excellent insulator has to be attached to the back surface of the friction pad as a countermeasure for vapor-lock.
In this respect, it has been proposed to provide a friction pad which has a back plate of a different material coupled to a carbon-carbon composite lining by rivets or the like. Since a plurality of heavy rivets are used for this friction pad, the total weight of the pad increases even with the use of the carbon-carbon composite.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide friction pads of a disc brake for a vehicle, which can prevent an oxidative damage, and have excellent heat insulation.
A friction pad according to the present invention comprises a lining friction-engageable with a brake disc; and a coating layer formed on a back surface of the lining and a torque receiving surface on a side of the lining. The lining is formed of a carbon composite material, and the coating layer is made of either glass or a heat resistant resin.
According to another friction pad embodying the present invention, the coating layer is formed on the side of the lining in addition to the torque receiving surface.
The carbon composite material for the friction pad of the present invention is preferably a carbon-carbon composite or a glass-impregnated carbon material.
The carbon-carbon composite can be provided by subjecting the carbon-matrix impregnated carbon fibers to the carbonization and high densification treatment, as described above.
The glass-impregnated carbon material can be yielded by impregnating glass components into the carbon pores of the carbon-carbon composite.
Glass for the friction pad of the present invention is desirably borosilicate glass.
With the above structure, the friction pads of the present invention have enhanced rigidity and resistance against the pressure from a piston and a retarding torque, providing a good and strong brake feeling to
REFERENCES:
patent: 2158337 (1939-05-01), Rasmussen
patent: 2554548 (1951-05-01), Albagnac
patent: 2801714 (1957-08-01), Dott
patent: 4022302 (1977-05-01), Janssen
patent: 4373615 (1983-02-01), Melinat
patent: 4742948 (1988-05-01), Fisher et al.
patent: 5103942 (1992-04-01), Schmitt
Nissin Kogyo Kabushiki Kaisha
Oberleitner Robert J.
Poon Peter M.
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