Brakes – Elements – Shoes
Reexamination Certificate
1999-05-10
2001-04-24
Oberleitner, Robert J. (Department: 3613)
Brakes
Elements
Shoes
C428S446000
Reexamination Certificate
active
06220404
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a non-asbestos disc brake pad for automobiles (hereinafter referred to as “disc brake pad”).
As a braking system for automobiles, there are used disc brakes, in which a disc brake pad is used as a braking part.
Some known disc brake pads use asbestos (e.g. JP-A 49-21544, Junkatsu vol. 19, no. 9, p. 625-631 (1974)). In contrast, JP-A 2-132175 discloses a non-asbestos friction material which is a mixture comprising a fibrous base material such as metal fibers, inorganic fibers and organic fibers; a binder including a thermosetting resin such as a phenol resin; and as a friction adjusting agent a lubricant such as graphite, antimony trisulfide, etc, a powder of metal such as iron, copper, brass, etc., a filler such as barium sulfate, calcium carbonate, etc. and/or an organic friction adjusting agent such as cashew dust, acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), etc. Such a mixture is subjected to molding with heating under pressure to give a disc brake pad.
But automobiles using these prior art disc brake pads generate a noise which is so-called “creep groan”. This noise seems to be derived from the generation of stick slip vibration when a creep torque of an automatic transmission is applied to a disc brake, said stick slip vibration being resonated to produce a noise. The frequency of this noise is usually about 200 to 300 Hz. When a car is driven again after parking the car for a long period of time, particularly after parking (allowing to stand) the car overnight with a large change in temperature and/or humidity, the phenomenon of the creep groan occurs abruptly with a large amount at an initial stage of driving, which makes a driver uneasy and unpleasant.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a disc brake pad capable of lowering a sound pressure of the creep groan by preventing a transfer film, which is obtained by attaching a part of the disc brake pad to oppositely placing disc rotor when braked, from water, or removing the water once adsorbed from the transfer film.
The present invention provides a disc brake pad for automobiles obtained by using a composition comprising a fibrous base material except for asbestos, a binder and a friction adjusting agent, wherein a silicone modified resin is contained as a part or whole of the binder, and zeolite is contained as a part of the friction adjusting agent.
REFERENCES:
patent: 5078909 (1992-01-01), Shigeta et al.
patent: 5344899 (1994-09-01), Enomoto et al.
patent: 5387564 (1995-02-01), Takeuchi et al.
patent: 5563196 (1996-10-01), Kitahara et al.
patent: 6027708 (2000-02-01), Rayalu et al.
patent: 0807766A1 (1997-11-01), None
patent: 49-21544 (1974-02-01), None
patent: 2-132175 (1990-05-01), None
Junkatsu, vol. 19., No. 9, pp. 625-631, 1974.*
Database WPI, Section Ch., Week 9807, AN98-075487, Jun. 10, 1997 (Abstract of RU 2081133).
Database WPI, Section Ch., Week 8931, AN89-223360, Jun. 21, 1989 (Abstract of JP 01-158238).
Database WPI, Section Ch., Week 9087, AN98-075484, Jun. 10, 1997 (Abstract of RU 2081129).
Hara Yasuhiro
Inoue Mitsuhiro
Mibe Takahiro
Nakanishi Hiroyuki
Oyama Takeshi
Antonelli Terry Stout & Kraus LLP
Hitachi Chemical Company Ltd.
Oberleitner Robert J.
Rodriguez Pamela J.
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