| 摘要 |
<p>A brake drum which is used for a drum brake, wherein the drum (3) has a plurality of the projections (6) at the outer circumferential surface (5), the 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. A height of the projections is 0.3 to 5.0 mm, while the number of projections is 5 to 100/cm 2 . The brake drum is produced by centrifugal casting.</p> |
