BRAKE CALIPER PISTON ACTUATION DEVICE

摘要

A brake caliper piston actuation device comprises a caliper housing (20) including a bore (22) extending through the caliper housing (20). An end cap closes the bore (22) and has an end cap extension (28) and a fluid port (32). A piston (40) is disposed in the bore (22). An actuation member (48) has an inner surface and an outer surface and is disposed in the bore (22) and extends axially over the piston (40) to slidably support and guide the piston (40). The inner surface of the actuation member (48) and the fluid end of the piston (40) and the end cap extension (28) define a fluid chamber (54) for containing a hydraulic fluid entering from the fluid port (32). A parking brake mechanism engages the actuation member (48) for causing axial movement of the actuation member (48). The piston (40) moves in response to the hydraulic fluid entering the fluid chamber (54) and by the parking brake mechanism advancing the actuation member (48) and pushing the piston (40) axially.

主权项

1. A brake caliper assembly for use in a vehicle comprising;
a caliper housing including a bore extending between an open end and a closed end with and having an inner diameter and a length extending through said caliper housing along a center axis, an end cap closing said closed end of said bore and having an end cap extension extending axially and centrally into said bore, said end cap including a fluid port establishing fluid communication of a hydraulic fluid through said end cap and into said bore, a piston having a pad end extending from said open end of said bore and a fluid end and disposed in said bore for movement along said center axis for providing braking force in response to the hydraulic fluid entering said bore through said fluid port and against said fluid end to move said piston axially, an actuation member being tubular in shape and having an outer surface and an inner surface and a first end and a second end and disposed along said center axis inside of said bore and extending axially over said end cap extension to move said piston axially, a parking brake mechanism engaging said outer surface of said actuation member for causing axial movement of said actuation member within said bore along said center axis, and characterized by said actuation member extending axially over said fluid end of said piston toward said open end of said bore and extending axially over said end cap extension and defining a fluid chamber between said fluid end of said piston and said inner surface of said actuation member and said end cap extension for containing and separating the hydraulic fluid entering through said fluid port from said outer surface of said actuation member and said parking brake mechanism.