| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing device to prevent the generation of noise due to adhesion during operation and provide a comfortable using state. SOLUTION: An oil seal 1 is fitted in the corner part 201a of the housing 201 of a brake booster 200 and the inner peripheral side is brought into seal contact with the outer periphery of the valve body part 203 of a power piston. During non-operation of a brake booster, the oil seal makes contact with a key 103 protruded from the outer periphery of a valve body part 203 and is engaged therewith to regulate axial movement of a power piston. A fabric 4 is mounted on the end face 35a on the output side (O) of the flange covering part 35 of the oil seal 1 separated during operation. |
