| 摘要 |
PURPOSE:To relatively speedily decelerate an oil hydraulic motor, by supplying pressurized oil to the upstream of a relief valve in an outlet side circuit for preventing decrease of pressure. CONSTITUTION:A branch passage 6 is closed by, for instance, a selector valve 8 simultaneously pressurized oil is fed to an outlet side circuit 4 by a pressurized oil supply pump 9 or the like. As a result, a pressure drop of the circuit 4 due to opening of a relief valve 5 can be prevented, even after the opening of the relief valve 5, further deceleration of an oil hydraulic motor 1 is performed. Or if a variable throttle 10 and check valve 11 are parallelly interposed in the circuit 6, a selector valve 3 is operated such that pressurized oil in the circuit 4 is returned to a tank through the valve 11 during driving of the motor 1 while pressurized oil of a main pump 2 is supplied to the circuit 4 through the throttle 10 at deceleration. |
