Automatic shoe clearance adjusting device in shoe drum brake

摘要

An automatic shoe clearance adjusting device in a shoe drum brake of the type including a first strut member, a second strut member telescopically projecting from the first strut member, an adjusting nut rotatably mounted on the first strut member and engaging in screw threaded engagement with the second strut member, a member for rotating the adjusting nut in one direction, and a structure for controlling the rotation of the adjusting nut in the opposite direction. The rotation control structure is associated with a heat responsive element such that when the temperature in the brake exceeds a predetermined level, the adjustment of shoe clearance will not be effected.