Importance

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Abstract

The invention relates to a hat-shaped brake disc made from a castable metal for vehicle wheels. It has, within the friction ring, a nave with a nave casing and nave bottom, the latter having screw-passage holes for screwing the brake disc to the wheel hub. The friction ring contains indentations rounded out on both sides in the region of transition to the nave casing. The brake disc consists completely, up to and including that immediate surface of the friction ring which is subjected to frictional stress during braking, of a particle reinforced composite aluminum material with intercalated hard-material particles of ceramic, particularly of aluminum oxide or silicon carbide (so-called Al-MMC=Aluminum-Metal-Matrix-Composite) and/or of a hypereutectic Al/Si alloy with intercalated silicon crystals. It is designed and produced as a die casting, all the surface parts of the casting being cast with a very small shape and dimension deviation. Only the frictionally-stressed surfaces of the friction ring and, where appropriate, a frictionally-stressed hollow-cylindrical brake surface inside the nave need to be machined by cutting. A radially projecting flange is arranged on the outside of the nave at the transition from the nave bottom to the nave casing, via which flange the brake disc can be secured axially in or on a workpiece holder during machining.

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First Claim