Patent ID: 8573370

Claim:
A disk brake device comprising: a caliper body; a cam housing assembly, accommodated in the caliper body, configured to oscillate by rotation of an eccentric cam attached to a camshaft, and configured to press a clutch by a cam pin of the cam housing assembly; and a pair of piston assemblies accommodated in the caliper body, each of which comprising a piston adapted to slide within a sleeve, a plug being in contact with the distal end of the piston, a spindle and a nut which is screwed on the spindle, wherein the distal end of the piston and the plug are in contact with each other on concave and convex spherical surfaces so that each of the piston assemblies is oscillatably supported in a hole portion of the caliper body, wherein the piston assemblies are configured to press a brake pad through sequential pushing of the spindle, the nut and the piston by pushing the clutch by the cam pin, and wherein each of the piston assemblies is oscillatably supported by an oscillation support pin which is parallel to the cam pin and which is inserted through the sleeve and through a guide ring attached to the sleeve, so that the sleeve is adapted to be tilted with respect to the oscillation support pin.