SELF-ADJUSTING BRAKE DEVICE

摘要

A predetermined clearance (A) between a disc (36) and a brake pad (34) in a disc brake calliper (10) is maintained by a selfadjusting device (24). A screw (48) is screwed into the block (26) and a spring sleeve (50) fits tightly in a bore (20) in the calliper and loosely around the screw shank but is trapped by the head (52) of the screw. In the state shown, the sleeve (50) abuts the block (26) but a small gap (A) exists between the sleeve (50) and the screw head (52), establishing the same clearance (A) between the pad (34) and disc (36). When the brake is applied the sleeve (20) is drawn out to the extent necessary to maintain the clearance (A) as the pad 34 wears. Embodiments are described with a return spring, e.g. a stack of Belleville washers, which acts between the sleeve (50) and the head (52) and is compressed solid when the brake is applied.