| 摘要 |
PROBLEM TO BE SOLVED: To start up a hydraulic motor.SOLUTION: This hydraulic motor 7 includes a start-up means 15 for rotating a crankshaft, based on a motor starting-up command from a stopped state, in the hydraulic motor 7 including power parts provided plurally corresponding to rotational positions of a crank of the crankshaft, and for rotating the crankshaft by conducting a reciprocation operation between an expansion stroke and a contraction stroke with supply of a hydraulic oil, to rotate and move the crank, the first supply port opening and closing valve for opening and closing the first hydraulic oil supply port provided in such a manner as supplying the pressurized hydraulic oil to each power part, and a discharge port opening and closing valve for opening and closing a hydraulic oil discharge port provided in such a manner as discharging the hydraulic oil from each power part, and constituted to opening-operate the first supply port opening and closing valve by internal pressure of the power part in a contraction process. |
