| 摘要 |
<p>A nozzle (21) for spraying hydraulic oil is provided at the inner surface of a housing (1) at a position facing the outer peripheral surface of a cylinder block (4). During the rotation of the cylinder block (4) hydraulic oil is applied to the outer peripheral surface of the cylinder block (4) from the nozzle (21) and the hydraulic oil can draw frictional heat generated by the sliding between pistons (5) and cylinders (40). Consequently the seizure between the pistons (5) and the cylinders (40) can be prevented.</p> |
