| 摘要 |
PROBLEM TO BE SOLVED: To reduce an impact and make the improvement of return of a steering wheel in the vicinity of a neutral position and high speed straight advance stability compatible when reverse inputting from the dirigible road wheel side such as a kick back is done. SOLUTION: A steering damper 10 of a power steering device is provided with a flow passage selector valve CV for selectively switching and connecting a pump P, a tank T, and left and right chambers CL, CR of a power cylinder P/C in accordance with steering operation and a pair of cylinder passages 3, 4 for connecting the flow passage selector valve with the left and right chambers of the power cylinder. It is provided with variable throttle valves 6, 7 provided on the halfway of each cylinder passage to limit in flow to the flow passage selector valve from the power cylinder and check valves 8, 9 connected to the variable throttle valves in parallel to allow in flow to the power cylinder from the flow passage selector valve. Furthermore, it is provided with third valves 11, 12 closed by a flow from the flow passage selector valve and opened by a flow of a small flow rate from the power cylinder and fixed restrictions 13, 14 for allowing in flow to the flow passage selector valve from the power cylinder when the third valves are opened. |
