Patent ID: 6446767
Filing Date: 2002-09-10
Classification: F16D

Abstract:
An improved disc braking system of the type employing two mating housings, with each housing having a pair of cylindrical piston receiving recesses, and wherein each of the piston receiving recesses is adapted to support a base mounted spring, a brake fluid inlet passage and an upstanding seal formed adjacent an opened end of the piston recess, the brake system further adapted to support a slidably positioned brake pad formed adjacent the opened ends of the piston recesses, an improved piston structure fabricated of a metallic material comprising:a cylindrical base portion formed from a major diameter, the base portion having an annular spring receiving recess formed therein with a base mounted coil spring received within the annular recess; a cylindrical recess formed within the length of the base portion, an elastomeric o-ring positioned within the recess and having an outer surface adapted to form a fluid tight seal with a cylindrical piston recess of the brake system; a cylindrical brake pad engaging portion formed from a minor diameter; a thin layer of metallic material integrally formed in the remainder of the piston adapted to engage the surface of an adjacent brake pad; a cylindrical recess formed within the length of the engaging portion and adapted to receive a peripheral edge of the upstanding seal of the braking system; and a threaded aperture extending through the thin layer of metallic material and into the adjacent portion of the piston whereby the thin layer of metallic material may be removed and replaced by a heat isolating material and retained by a bolt.