Disc Brake And Caliper Body

Abstract: Provided are a disc brake and a caliper body that prevent the caliper body from increasing in size toward a disc leading edge and a disc trailing edge by bulging portions provided at completion positions of friction stir welding. Two cylinders 4 are provided to an action unit 3a of a caliper body 3 disposed on one side portion of a disc rotor 2. The cylinders 4 each include a cylinder bore 4a formed therethrough in a disc axial direction, and a lid member 4b that closes an opening of the cylinder bore 4a on a side opposite to the disc rotor side and forms a bottom portion of the cylinder 4. The lid member 4b is friction stir welded to the opening over the entire periphery thereof. The completion positions of the friction stir welding are each provided in a region surrounded by two tangents T1, T1 connecting outermost peripheries of the cylinders 4, 4 adjacent to each other and the outermost peripheries of the cylinders adjacent to each other.

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