Patent ID: 8905202
Filing Date: 2014-12-09
Classification: F16D

Abstract:
1. A brake drum which is used for a drum brake, wherein the brake drum has a plurality of projections at the outer circumferential surface of the brake drum said plurality of the projections are formed at the outer circumferential surface as a whole when casting a brake drum, and at least part of the projections have thin-waisted shapes such that said at least part of the projections have a substantially domed tip part distal to the outer circumferential surface, a base part proximal to the outer circumferential surface, and a middle part located between the domed tip part and the base part and having a thinnest portion of the projection, wherein the middle part is gradually thinner toward the outer circumferential surface from a thickest portion of the domed tip part to the thinnest portion of the projection and gradually thicker toward the outer circumferential surface from the thinnest portion of the projection to a lowest middle portion, the lowest middle portion having a thickness equal to a thickness of the thickest portion of the domed tip part to define the thin-waisted shapes, and wherein the base part is gradually thicker from the lowest middle portion to the outer circumferential surface.