| 摘要 |
A hydraulic master cylinder assembly of the type including a reservoir in which a diaphragm is disposed to divide the reservoir chamber into a hydraulic fluid chamber outside of the diaphragm and in communication with the pressure chamber of the master cylinder and a gas chamber within the diaphragm. The diaphragm is generally tubular with an open end and a closed end, and in a cross section transverse to the central axis of the diaphragm, includes a plurality of radially extending arms arranged about the central axis of the diaphragm and each including a pair of side walls defining therebetween a portion of the volume of the gas chamber. The diaphragm is movable between an expanded condition in which it assumes a substantially circular configuration in cross section and a collapsed condition in which each of the pairs of side walls of the arms are collapsed with respect to each other to reduce the volume of the chamber. In the disclosed embodiment, the arms are arrayed about the central axis of the diaphragm in symmetrical fashion and four arms are provided to define a cross or crucifix configuration.
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