| 摘要 |
PURPOSE:To permit variation of rotational speed of a load driving hydraulic motor to be suppressed even if a load is varied, by connecting the output shaft of a pilot hydraulic motor for providing a switch valve, with a pilot signal, to the output shaft of the load driving hydraulic motor. CONSTITUTION:The output shaft of a load driving hydraulic motor 1 is connected to the output shaft of a pilot hydraulic motor 13. The pressurized oil from a controlling hydraulic pump 9 is supplied to the pilot hydraulic motor 13 from conduits 15 and 16 through a switch valve 14 with which the flow rate and direction can be varied continuously. Pilot lines 17 and 18 extend from conduits 15 and 16 respectively and go to the pilot ports on both sides of a direction switching valve 2 of pilot system, style. When the amount of inclination of a lever 10 is kept constant, the number of revolution of the hydraulic motor can be maintained approximately constant even if the load is varied. |
