| 摘要 |
<p>A hydraulic power steering system (1, 1') for a vehicle comprising a hydraulic fluid displacement pump (2), operated by a thermal engine (3) of the vehicle and provided with a suction port (4) and a delivery port (5), a reservoir (6) for collecting said fluid, connected to suction port (4), a double-acting hydraulic cylinder (7), capable of controlling direction of front wheels (8) of the vehicle, and a distribution unit (9) fitted with an inlet port (11), connected to delivery port (5), a vent port (13), connected to reservoir (6) and two service ports (14, 15), connected to respective chambers (18, 19) of hydraulic cylinder (7); distribution unit (9) comprising a first and a second distributor (26, 28), respectively controlled by hydraulic cylinder (7) and by a steering wheel (10) of the vehicle and movable with respect to each other; pump (2) being of the variable displacement type and system (1, 1') further comprising a flow request sensor (31) from and to chambers (18, 19) of cylinder (7) and a device (30) for adjusting displacement of pump (2), controlled by sensor (31). <IMAGE></p> |
