IMPROVEMENTS IN OR RELATING TO VENTILATED DISC BRAKE ROTORS

摘要

A ventilated disc brake rotor (1) has an inner flange portion (4) containing a plural number N of axial fixing holes (5). This flange portion (4) extends radially outwards into an integral annular braking portion having axially opposed friction surfaces (6). The rotor contains at least 6N ventilation channels (7a, 7b) passing between its inner periphery (2) and outer periphery (3), the axial widths of these channels not exceeding one quarter of the axial thickness of the annular braking porion. The inner ends of the channels are preferably arranged to meet in groups of six or more at air collection recesses (8). The high ventilated surface area of the rotors results in a particularly high heat transfer coefficient combined with good mechanical strength and structural integrity.