| 摘要 |
<p>PURPOSE:To ensure straight running and operation of other actuators, by providing a switching valve which feeds pressure oil from a second hydraulic pump to a running motor and pressure oil from a first hydraulic pump to actuators other than that for running. CONSTITUTION:A hydraulic circuit consists of a first hydraulic pump 1, a second hydraulic pump 2, a first direction switching valve group 4, and a second direction switching valve group 5, and is provided on the upper stream side of the group 5 with a switching valve 5e. In case actuators other than that for running are operated as a vehicle runs straight, the valve 5e is switched from a position A to a position B, pressure oil from the pump 2 is fed through a line 9, a valve 5d, and a line 10 to a right running motor and is fed through a line 7, the valve 5e, and a line 10 to a left running motor to ensure straight running. Meanwhile, pressure oil from the pump 1 is fed to actuators other than that for running to ensure operation of the actuators only for running.</p> |
