| 摘要 |
A vacuum operable differential servo-motor adapted for use on motor vehicles to operate, for example, an anti-skid brake control system, a brake booster and the like, including a housing, a power piston movable therein and dividing the interior of the housing into two chambers one on each side of the power piston, a conduit member fluidly connecting one of the chambers to an engine intake manifold, a solenoid valve for controlling a pressure differential between the chambers in response to an input signal and a failure sensing switch member having a casing outside of the housing and a plunger operatively connected to the power piston and a diaphragm seal member with its peripheral bead clamped between the casing and the housing with a central portion being sealed to the plunger.
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