DRUM BRAKE WHEEL CYLINDER

摘要

A wheel cylinder of a drum brake is provided to prevent contamination of equipments by preventing brake oil from being leaked in the case of operation of a wheel cylinder. A wheel cylinder(20) of a drum brake pushing a pair of brake shoes whose one side is hinged to a backing plate through a rod(23), comprises: a body(21) fixed to the backing plate, a pair of pistons(22) slidely installed inside the body, a pair of seal members(24) equipped with a groove in one side, which are respectively installed between the pistons and prevent leakage of brake oil from the body, a pressurization spring(25) whose ends are respectively held by the grooves in a state elastically supporting the seal members, the pair of rods whose one side is respectively supported to an outer side of the pistons and the other side is supported to the brake shoe and a pair of covers(26) connected in both sides of the body by pressing so as to seal the pistons, the seal members and pressurization spring.