| 摘要 |
PURPOSE:To enable replacement of the working oil with fresh working oil every time only in a small amount by providing a working oil supply stroke zone, in addition to an actuator reciprocating stroke zone, in a rotary cam for operating a hydraulic pump. CONSTITUTION:When a rotary can 5 is further rotated over an actuator advancing stroke zone A-B and a return stroke zone C-D and enters a working oil supply stroke zone D-A, the working oil delivered from a low-pressure oil supplier 11 is supplied to a hydraulic pump 4 through a pipeline 12 and a pipeline 8. As described above, the oil confined between a hydraulic actuator 1 and hydraulic pump 4 is circulated every time only by a small amount according to the reciprocating operation of the device, and replaced with fresh working oil. |
