Patent ID: 8672100
Filing Date: 2014-03-18
Classification: B23K,F15B,F16D,Y10T

Abstract:
1. A disk brake comprising a caliper in which pistons are caused to slidingly move in bores of cylinders under application of a hydraulic pressure and thereby press brake pads against a disk, the cylinders being disposed at both sides of the disk in opposing relation to each other, and one of the cylinders being provided with a pair of vehicle mounting portions extending in a radial direction of the disk for receiving mounting bolts in positions that are perpendicular to lines extending in an axial direction of the disk so as to radially mount the caliper on a non-rotatable portion of a vehicle, the other of the cylinders being disposed at an opposite side of the disk relative to the one of the cylinders, the other of the cylinders comprising: a covering member, which is made of aluminum and is provided in a bottom portion of the cylinder; and a cylinder body which is made of aluminum and has an opening that is closed by the covering member and has an inner diameter that is smaller than that of an internal diameter portion of the bore, wherein an outer circumferential portion of the covering member and an inner circumferential portion of the opening of the cylinder body are friction stir welded to each other along the entire periphery of the covering member to form a connecting portion that surrounds the covering member in the form of a closed loop, wherein the connecting portion and the pair of vehicle mounting portions are located on opposite sides of the disk from each other.