| 摘要 |
<p>A master cylinder assembly comprising two separate master cylinders (1, 2) is disclosed. Pressure spaces (28) of the master cylinders (1, 2) are interconnected through outlet passages (31) and a transfer passage (30), and a transfer valve (32) is housed within each radial outlet passage (31). When the master cylinders (1, 2) are inoperative both transfer valves (32) are disposed in intermediate positions in which a limited flow can take place through both valves (32) in both directions. This prevents hydraulic fluid from being trapped in the transfer passage (30) which otherwise might cause a fracture to occur upon expansion with temperature of the fluid. Each transfer valve (32) comprises a valve member (33) which is engageable with a seating (34). The valve members (33) may be held away from the seatings (34) by the thickness of a film of hydraulic fluid therebetween. In another construction discrete resilient projections (42, 53) are provided either on the seatings (34) or on the valve members (33) to hold the valve members (33) away from the seatings (34).</p> |
