| 摘要 |
PROBLEM TO BE SOLVED: To provide the negative pressure type servo unit which can restrict the output in accordance with the actuation of actuator to or below the maximum power. SOLUTION: This negative pressure type servo unit 10 comprises a housing 14, moving walls 17, 20, a power piston 22, an input member 28, a breather valve seat, a negative pressure valve seat, a control valve 36 with an atmospheric seal portion and a negative pressure seal portion, an output rod 53, a reaction disc 52, a slider valve 42, and an actuator 45. In this case, a key member 29 is disposed which moves the power piston 22 and the input member 28 as one body in accordance with the actuation of the actuator 45 when the input member 28 is not operated and restrains the retreat of the input member 28 by the reaction disc 52. |
