| 摘要 |
PROBLEM TO BE SOLVED: To eliminate trouble with a cup seal in a power steering device even if a second valve for communicating and shutting off an outlet is provided in addition to a first valve for communicating and shutting off an inlet. SOLUTION: A valve that switches an outlet 120 and a reservoir tank 70 from a mutually shut-off state to a mutually communicated state is provided as a third valve which operates in response to the stop of the supply of hydraulic fluid from a main pump to an inlet 110, so that even when no hydraulic fluid is supplied by the main pump, a power steering device can be replenished with the hydraulic fluid. Also, a means 20 located on the side of the inlet 110 and including a piston which makes a stroke when the hydraulic fluid flows in is adopted as a switch means which, when detecting the failure of a first hydraulic fluid supply system including the main pump, operates a second hydraulic fluid supply system including an emergency pump 90. |
