| 摘要 |
<p>PROBLEM TO BE SOLVED: To generate no fluctuation of travel speed even in case of operaing a dozer cylinder while making a construction machine travel by providing a flow dividing valve having selector valves in a traveling motor feed oil passage position of a hydraulic circuit of a construction machine provided with a dozer cylinder and in a flow dividing oil passage position to traveling motors and the dozer cylinder. SOLUTION: In case of performing dozer work, a switch is operated on in advance. When a hydraulic remote-controlled valve 49 for a dozer is operated at the time of a travel skate, a dozer selector valve 19' is put in switching operation, and a relatively small flow quantity of pressure oil led out of a dozer cylinder output port 62 of a flow dividing valve 44 flows out to a dozer cylinder 5' to actuate an earth discharge plate 26. In this case, since oil pressure is supplied to traveling motors 6L, 6R from traveling motor output ports 56L, 56R of the flow dividing valve 44, fluctuation of travel speed is not generated even with actuation/stop operation of the dozer cylinder 5' during the travel of a hydraulic shovel.</p> |
