| 摘要 |
<p>PURPOSE:To prevent any possible liquid leak from occurring in a simple and accurate manner by fitting the projection of a bearing in a long groove of a swash plate shaft, dividing the long groove into plural volumetric parts, while setting an opening area of the long groove so as to make such a force as floating a swash plate by dint of hydraulic pressure to be taken into the volumetric part, become the specified value. CONSTITUTION:A swash plate shaft 2 with a convex curved surface of a swash plate 1 is supported free of sliding motion by a concave curved surface 3a of a bearing 3. In addition, a cylinder block 4 fitted with a piston 5 is connected to a main shaft 6 piercing through the swash plate 1. Further the piston 5 is connected to the swash plate 1 via a shoe 7. In this case, a long groove 15 extending in a sliding direction is formed on the convex curved surface 2a, while a projection 16 adhering to the long groove 15 is formed on a concave curved surface 3a, and then the long groove 15 is divided into plural parts in the longitudinal direction. By the way, discharge pressure is made to act on a volumetric part 15a-1 on one side, where the long groove 15 is divided, and the swash plate 1 is turned round in an A direction, while another discharge pressure is made to act on another volumetric part 15a-2 on the other, thereby turning the swash plate 1 round in a B direction as well.</p> |
