Piston with extended outer cover for use in disc brake assembly
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United States of America Patent
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Dec 8, 1998
Issued Date -
N/A
app pub date -
Apr 7, 1997
filing date -
Nov 13, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A piston for use in a vehicle disc brake assembly includes a generally hollow cylindrical body having an open end and a closed end. The body is formed from a plastic material and includes inner and outer cylindrical surfaces which extend axially between the open end and the closed end. A generally cylindrical steel cover is integrally molded about the closed end and the outer surface of the body of the piston. The cover includes an end wall, an outer side wall and an open end. The end wall of the cover extends about the closed end of the body of the piston, and the outer side wall of the cover extends axially along the outer surface of the body of the piston. The outer side wall of the cover extends past the open end of the body of the piston, in the direction of the brake shoe. Accordingly, during the braking operation it is the steel cover which urges the brake shoe against the rotor, instead of the body of the piston urging the brake shoe against the rotor. The body of the piston does not come into contact with the brake shoe. This structure effectively protects the plastic body of the piston from the heat generated during braking, and thereby greatly extends the life of the piston.
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