BRAKING DEVICE

摘要

A braking device includes a guide piston which surrounds the outer periphery of a rod part of a second slave piston, a cup seal which is mounted on the second slave piston, and a seal member which is provided on the guide piston. The second slave piston includes an enlarged diameter portion which comes into contact with an axial-direction surface of the guide piston when the second slave piston is in the initial position, and the enlarged diameter portion is provided with a cut-out section which extends in the internal diameter direction of the second slave piston.

主权项

1. A braking device comprising:
a master cylinder that generates a brake hydraulic pressure by operation of a brake operation unit; a slave cylinder that displaces a slave piston by an electric motor which is driven in response to operation amount of the brake operation unit and generates a brake hydraulic pressure, and has a slave cylinder body provided with an opening section into which the slave piston can be inserted from outside; a guide piston that blocks the opening section of the slave cylinder body and surrounds an outer periphery of the slave piston; a first seal member that is provided on the slave piston and seals in sliding contact with an inside wall of the slave cylinder body; and a second seal member that is provided on the guide piston and seals in abutment against the inside wall of the slave cylinder body, wherein the slave piston includes an enlarged diameter portion which comes into contact with an axial-direction surface of the guide piston when the slave piston is in an initial position, and at least one of the enlarged diameter portion of the slave piston and the axial-direction surface of the guide piston is provided with a cut-out section which extends in an internal diameter direction.