| 摘要 |
PROBLEM TO BE SOLVED: To prevent increase of a differential pressure of a power cylinder in the vicinity of the neutral position of a steering wheel so as to improve neutral rigidity of the steering wheel. SOLUTION: A power steering device is provided with a first control unit, in which variable throttles V1-V4 are respectively provided in a flow path connected to a pump 10 and to a reservoir 11, and a second control unit, which is connected to the first control unit in parallel and is provided with variable throttles V5-V8 in a flow path respectively connected to both hydraulic chambers for the pump 10 and the power cylinder 12 and to the reservoir 11. Among the variable throttles V5-V8 in the second control unit, the variable throttles V7, V8 on the reservoir 11 side are constructed of center close valves. |
