| 摘要 |
Composite brake disc 20 having hub 22 securable to a road wheel or vehicle axle and made of a first material, and brake member comprising integrally formed annular friction ring 24 (having inner and outer radii 20a, 20b) and axially extending hollow cylindrical flange 28, made from a second material. The first material has lower density and melting point, and possibly a higher coefficient of linear thermal expansion, than the second material. Hub 22 is formed by casting the first material over flange 28. The first and second materials may be aluminium alloy and cast iron respectively. Friction ring 24 and flange 28 may be integrally formed by casting. Annular friction flange may have radial / axial castellations (28a), nubs (28b), and or holes (28c). Hub 22 may extend through the inner radius 20a, and axially outward, of friction ring 24. A method of manufacture is also included, including performing, moulding, casting, machining, and forming holes. |
