Patent ID: 9180842
Filing Date: 2015-11-10
Classification: B60T,F16D

Abstract:
1. A multi-plate disc brake comprising interleaved rotatable and non-rotatable brake discs within a brake housing, a ball and ramp type brake actuator comprising first and second relatively rotatable annular actuator discs with actuator balls therebetween located in circumferentially ramped pockets on opposing faces of the actuator discs, a wedge-shaped actuator member and an actuating piston to displace the actuator member between confronting abutments on the respective actuator discs to relatively rotate the discs to cause the balls to rise up the ramped pockets and hence expand the actuator axially to move the brake discs into engagement, the wedge-shaped actuator member comprising a central passage to a volume between said actuator discs, through which passage said cooling oil is supplied into the brake housing through the wedge-shaped actuator member.