| 摘要 |
An electro-hydraulic control apparatus for a rear wheel steering mechanism includes a pair of electromagnetic flow control valves connected to a fluid supply passage respectively through an orifice to produce first and second pilot pressures, a directional control valve arranged to be applied with the first and second pilot pressures for selectively connecting the fluid supply passage to one of opposite fluid chambers of a hydraulic power cylinder in the rear wheel steering mechanism and connecting the other fluid chamber to a fluid reservoir in accordance with a difference between the first and second pilot pressures, and a pair of cut-off valves respectively disposed within first and second distribution passages connecting the directional control valve to the opposite fluid chambers of the power cylinder, the cut-off valves being arranged to be respectively applied with the first and second pilot pressures for permitting the flow of fluid passing through the distribution passages when the pilot pressures are maintained higher than a predetermined value and for interrupting the flow of fluid passing through the distribution passages when the pilot pressures become lower than the predetermined value.
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