| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve operating efficiency and reliability by lubricating a space between a cylinder and a piston with drain oil inside a casing. SOLUTION: A hydraulic rotary machine is structured so that an oil groove 15 corresponding to a seal section in which a piston 9 is always inserted is disposed on the inner periphery side of each cylinder 7, a communicating path 16 which always communicate the oil groove 15 to a drain oil chamber 4 is disposed in a cylinder block 6, and the communicating path 16 is formed in the cylinder block 6 in radial direction so that an flow inlet is open to a shaft inserting hole 6A and a flow outlet is open to an outer peripheral surface 6C. Therefore, by rotating the cylinder block 6, the oil inside the drain oil chamber 4 can be fed from the communicating path 16 to the oil groove 15 using a centrifugal force caused by this rotation, and also the space between the cylinder 7 and the piston 9 can be lubricated with the oil inside the oil groove 15.</p> |
