| 摘要 |
Apparatus for equalizing pressure and absorbing shock to prevent single wheel lock-up in a pneumatic braking system including a pneumatic source coupled by air lines to two brake actuators and being subject to the presence of contaminants of the water droplet and particulate type, the apparatus comprising a walled housing including an inner surface forming an elongated cavity having a first port for connection to the pneumatic source and a second port for connection to one of the actuators, the cavity being configured to form a first chamber that communicates with the first and the second port and to form a second chamber, a rigid piston having a first end and an opposed second end, an elongated resiliently yieldable, shock absorbing member disposed within the cavity between the second end and an opposite wall of the cavity, the member having an outer surface and a transverse cross-sectional dimension less than the corresponding transverse cross-sectional dimension of the cavity such that the separated outer surface of the member and the inner surface of the housing form the second chamber, and a resilient covering extending from the periphery of the inner surface over the first end, the covering serving to seal the piston, member and second chamber from the contaminants, whereby an increase in pneumatic pressure in the first chamber is transmitted through the covering to the piston, causing the piston to deform the member into the second chamber.
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