Adjustment mechanism for disc brake, with improved over-torque clutch

摘要

An adjustment mechanism for advancing the backing plate and friction material of a disc brake includes an over-torque clutch that provides a positive connection between inner and outer over-torque clutch members. In a preferred embodiment, spherical balls are forced into holes in both the inner and outer over-torque clutch members to allow rotation to be transmitted between inner and outer over-torque members. If the torque load exceeds a predetermined limit, then the balls move out of holes in at least one of the inner and outer over-torque clutch members. The spring force is preferably an axial force applied by a wave spring, which forces a washer to bias a plurality of balls into the holes.