| 摘要 |
A pneumatic booster includes a casing, a valve body axially movably disposed in the casing and having a tubular portion extending backward to the outside of the casing and open at the rear end thereof, a set of a power piston and a diaphragm fixedly mounted on the valve body and partitioning the interior of the casing into a constant pressure chamber communicating with a negative pressure source and a variable pressure chamber adapted to selectively communicate with the negative source and the ambient air, a valve unit disposed in the tubular portion of the valve body for selectively placing the variable pressure chamber in communication with the negative pressure source and the ambient air, an input rod extending into the tubular portion of the valve body for actuating the valve unit, and an output rod connected to the valve body. The pneumatic booster further includes a plurality of silencers disposed in the tubular portion between the valve unit and the rear open end of the valve body and a partitioning member disposed in the tubular portion for defining a plurality of air passages for separately directing air to the respective silencers.
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