Patent ID: 6478120
Filing Date: 2002-11-12
Classification: F16D

Abstract:
An actuating apparatus with automatic clearance adjustment for a vehicle hydraulic disk brake comprising:a housing including a housing base and a housing shell with an open cylinder bore; a piston, which for actuating the brake is hydraulically displaceable in the cylinder bore; and a mechanical actuating device for displacing the piston in the cylinder bore and for compensating brake lining wear, which mechanical actuating device including an expanding device acting axially in a brake actuating direction and a length adjustable strut disposed between the expanding device and the piston, which length adjustable strut formed by a first strut part with a bolt shaped end, which is screwed into a second, substantially sleeve shaped strut part, which rests with a conical flange against the piston, wherein between the bolt shaped end of the first strut part and the second sleeve shaped strut part there is a cavity, which is to be filled with brake fluid and is closed off in a fluid tight manner at one end, wherein the second sleeve shaped strut part has in the region of the cavity a plurality of radial bores, which connect the cavity to an outer peripheral surface of the second sleeve shaped strut part, and in the conical flange has a plurality of axial through bores, which are disposed relative to one another in such a way that in any rotational position of the second sleeve shaped strut part relative to the housing at least one radial bore is situated above a horizontal reference plane extending through a longitudinal center line of the length adjustable strut and a radially outer bore end thereof lies below at least one part of at least one axial through bore.