Patent ID: 9051632
Filing Date: 2015-06-09
Classification: C22C,F16B,F16D

Abstract:
1. A brake disc composed of two different materials, comprising: a disc plate made of a first material, the disc plate having an insert aperture formed through a central portion thereof, with a plurality of coupling depressions formed around a circumferential inner edge of the insert aperture, and a first rivet aperture formed in each of protrusion portions provided between the coupling depressions; a hat part made of a second material, the hat part being inserted into the insert aperture of the disc plate and provided with a plurality of coupling protrusions provided around a circumferential outer edge of the hat part, the coupling protrusions having a shape corresponding to a shape of the coupling depressions, with a second rivet aperture formed in the each of the coupling protrusions; a plurality of straps disposed in such a way that each of the straps passes over both the corresponding first rivet aperture of the disc plate and the corresponding second rivet aperture of the hat part; and a plurality of rivets inserted into the corresponding straps and the corresponding first and second rivet apertures to fix the straps, the disc plate and the hat part together, wherein each of the rivets has a cylindrical shape having a predetermined length, and opposite ends of the rivet are pressed into flange shapes when coupling the rivet to the disc plate and the hat part, wherein the flange-shaped opposite ends respectively come into close contact with the disc plate and the hat part under pressure, and wherein opposite ends of each of the straps are located on the corresponding first rivet apertures of the disc plate, and a medial portion thereof is located on the corresponding second rivet aperture of the hat part.