ADJUSTMENT DEVICE OF DRUM BRAKE

摘要

PURPOSE: An adjustment device of a drum brake is provided to reduce the manufacturing cost and the friction loss and to improve the responsibility of braking by modifying an adjustment devise. CONSTITUTION: An adjustment device of a drum comprises: a male push rod (63) to be connected with a nut (66); a first female push rod (61) and a second female push rod (62) to maintain intervals between a leading shoe (30) and a trailing shoe by the male push rod; if a lining is worn away, the nut is rotated by a spiral spring (65) in a center of the male push rod, and a length of an adjustment device is elongated.