| 摘要 |
An hydraulic actuation or control system for vehicles has a first system part (24) which includes an open centre valve (25) which may control operation of a power assisted steering gear (26) and a second system part (29) which has a closed centre valve (30) which may control actuation of power assistance braking or hydraulic suspension. The system parts (24 and 29) communicate with the common pump (1) by way of outlets (5 and 6) from a flow divider valve (2) which has a spool (36) displaceable in response to fluid pressure differentials detected in chambers (37 and 38) through the respective outlet ports (5 and 6) from the system parts (29 and 24 respectively). Outlet port (5) can communicate with exhaust (reservoir 20) through a biased relief valve (7) which is responsive to pressure in the system part (29) to close off communication between the outlet port (5) and exhaust when fluid pressure in the system part (29) decreases sufficiently. The system part (29) can include an accumulator (14) which is charged from outlet port (5) by way of a non-return valve (15) and the relief valve (7) is responsive to pressure in the accumulator.
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