| 摘要 |
PURPOSE:To enable both actuators to be steered in the relationship of 1:1 by interconnecting the front wheel actuator and fear wheel actuator hydraulically while equalizing pressure receiving areas of rack pistons of both actuators to each other. CONSTITUTION:The downstream side ports 28, 29 of a rotary valve 25 communicate to pressure chambers 23, 24 of a first front wheel actuator F1. The pressure chambers 23, 24 are formed with realy ports 34, 35 respectively which are connected to the upstream side ports 37, 38 of a changeover valve 36. The downstream side port 46 of change-over valve 36 is connected to a pressure chamber 51 of a second front wheel actuator F2 and the other port 47 is connected to a port 50 of the change-over valve 48. The first and second front wheel actuators F1, F2 have rack pistons 22, 53 which have the pressure receiving areas formed equally to each other. |
