| 摘要 |
<p>As the operator turns his steering wheel, the hand pump forces signal fluid into one end-cap atctuator and drains signal fluid from the other. The pressurized actuator moves and shifts the main spool in a given direction. The main spool shifts and pressurized fluid from the main pump is directed into the rod end of one of the steering cylinders and is directed into the head end of the other. As the vehicle completes its turn in the direction indicated by the hand pump, the cancelling device places the end-cap actuators in fluid communication with a reservoir. The main spool is returned to its neutral position by any suitable biasing, e.g., a spring.</p> |
