WHEEL CYLINDER FOR DRUM BRAKE AND DRUM BRAKE FOR VEHICLE

摘要

In the present invention a vehicle brake is, for example, equipped with: a movable component that includes a first piston for pressing a first brake shoe and a second piston for pressing a second brake shoe, and that is interposed between the first brake shoe and the second brake shoe so as to be able to move integrally inside a cylinder hole in a state in which a pressure chamber is in a non-pressurized state; a ratchet mechanism that rotationally displaces the first piston or the second piston such that the angle of rotation around an axis with respect to a housing increases as the stroke between the non-pressurized state and the pressurized state increases; and multiple extension mechanisms that increase the length of the movable component in the axial direction as the angle of rotation increases. One of the extension mechanisms is arranged between the one piston that is rotationally displaced by the ratchet mechanism and the brake shoe pressed by that piston, and the other extension mechanism is arranged between the first piston and the second piston.