Patent ID: 6244393
Filing Date: 2001-06-12
Classification: F16D

Abstract:
Disc brake caliper comprising:a hydraulic actuating device which includes a brake cylinder with an open end,a brake piston, which is axially movably arranged therein, the actuating device having an elastic sealing mounted in a circumferential annular groove in the inside of the brake cylinder and being in frictional abutment for sealing an external peripheral surface of the brake piston, wherein said circumferential annular groove includes groove walls, and wherein at least one of the groove walls of the annular groove includes a circumferential recess in the area of transition between the cylinder surface of the brake cylinder and the groove wall of the annular groove, into which recess the sealing ring is urged elastically by the brake piston, which is moved in an axial direction when the brake is applied, whereinthe circumferential recess is arranged at the groove wall of the annular groove that is closest to the open end of the brake cylinder, and in its cross-section is defined by a contour line, which, starting from the groove wall of the annular groove adjacent to the recess at a right angle between the contour line and the cylinder surface, passes from a convex curvature over into a concave curvature, and the sectionwise different radii of curvature of the contour line of the cross-section of recess tangentially pass into one another.