IMPROVEMENTS IN ELECTRICALLY-OPERATED DISC BRAKE ASSEMBLIES FOR VEHICLES

摘要

An electrically operated disc brake assembly for vehicles of the kind in which a friction member (9) is adapted to be applied to a rotatable brake disc (2) by a brake applying means which includes an electric motor (3) and a transmission means which is adapted to apply an axially directed brake applying force to the friction member (9) in response to operation of the motor (3) so that the transmission means acts on the friction member (9) at circumferentially spaced locations. This produces a substantially even loading across the friction member/disc interface, reducing the magnitude of the reaction torque. In one embodiment, the transmission means comprises a pair of axially spaced screw devices (4, 5) which are rotatable by the motor (3) acting through a common gear train (6), and the motor may further be provided at the centre of mass of the brake.