Patent ID: 9441690
Filing Date: 2016-09-13
CPC Classification: F16D

Claim Text:
1. A piston cap assembly particularly adapted for use in a disc brake caliper, comprising: a piston body slidably movable within a caliper bore along a central axis and having an end in contact with hydraulic fluid, a piston cap having a retention portion resting on an annular ledge within the piston body, a contact portion opposite from the retention portion that contacts a brake pad assembly, and an intermediate portion connecting the retention portion with the contact portion, wherein exterior surfaces of the contact portion, intermediate portion and retention portion define a heat transfer path between said brake lining and piston body, and wherein an air gap is defined between a top edge of the piston body and an undersurface of the contact portion of the piston cap allowing air to circulate over the heat transfer path, the heat transfer path between said brake lining and said piston body extended by the shape of the piston cap so that it is longer than a linear path parallel to said axis between the contact portion and the piston body, wherein the contact portion of the piston cap includes a central recess or opening such that only an outer periphery of the contact portion contacts a brake lining, and wherein the intermediate portion is formed from solid metal and functions as a heat sink for heat received from the contact portion of the piston cap.