Patent ID: 8069961
Filing Date: 2011-12-06
Classification: F16D

Abstract:
1. A disk brake apparatus, comprising: a piston accommodated on a leading end opening side of a cylinder hole formed in a caliper body; a thrust conversion mechanism disposed on a bottom side of the cylinder hole; an adjuster which comprises an adjust nut and an adjust bolt and is interposed between the thrust conversion mechanism and the piston and a parking brake which pushes the piston from the thrust conversion mechanism through the adjuster, wherein the thrust conversion mechanism comprises: the adjuster comprises a thrust transmission plate provided on an end portion of the adjust nut or the adjust bolt at in the bottom side of the cylinder hole, the thrust transmission plate facing the drive side cam plate, a substantially cylinder housing accommodates the fixed side cam plate, the drive side cam plate, the thrust transmission plate, a cam spring which energizes the thrust transmission plate toward the drive side cam plate, engaging grooves, extending in the cylinder hole axial direction, are formed on the bottom side of the cylinder hole and a circumferential groove is formed to connect the engaging grooves at middle portions thereof in the cylinder hole axial direction, the housing comprises: the circumferential groove is formed to be deeper than the engaging grooves in a radial direction of the cylinder hole; and a liquid passage hole is formed on the caliper body to be connected to the corresponding one of the engaging grooves and the circumferential groove.