| 摘要 |
<p>On an inner surface of a housing 1, a nozzle 21 for jetting operation oil is provided at a position opposite to an outer circumferential surface of a cylinder block 4. With this configuration, by spraying the operation oil from the nozzle 21 to the outer circumferential surface of the cylinder block 4 during rotation of the cylinder block 4, this operation oil can remove frictional heat generated by sliding between a piston 5 and a cylinder 40, and seizure of the piston 5 and seizure of the cylinder 40 can be prevented.</p> |
