Self-energizing disc brakes

摘要

In a self-energizing disc brake of the spreading type the recesses in the pressure plates in which the balls are housed, are machined directly into the material of the plates on pitch circles in the two plates of corresponding diameters. Each recess comprises an inclined ramp surface terminating at opposite ends in first and second end portions of which the end portion at the deeper end is engaged by the ball in an "off" position of brake, and the second portion is engaged by the ball to preclude further relative angular movement between the plates in brake-applying direction, thereby indicating a "wear stop". In addition ramp surfaces of different slopes may be located between the end portions so that an increased brake-applying effort towards a fully worn lining condition provides a wear warning device.