| 摘要 |
Rotational movements of the bodies (12, 14) of a rail vehicle are synchronised by two hydraulic actuators (20, 22) interconnected by two conduits (50, 52). To keep the conduits full of oil, an accumulator (87) is connected to the conduits through two non-return valves (82, 84). To keep the actuators in step, even if leakages occur, a spool valve (44) is provided, which opens correcting flow paths in dependence on the difference, if any, between the positions of the pistons (24, 25) of the two actuators. Such a flow path bypasses one or other of the non-return valves (82, 84), so that the direction of flow is controlled by the other non-return valve. As soon as the external forces on the bodies are such as to bring the actuators back into step, a correcting flow occurs. A spring device (54) allows the actuators to move out of step, under spring control; no correcting flow occurs under these conditions. <IMAGE> |
