| 摘要 |
The present invention provides a swash plate type hydraulic actuator comprising cylinders provided with an inner oil passage, an outer oil passage, cylinder bores, radial valve holes extending between the inner oil passage and the outer oil passages, and ports opening into the cylinder bores and the valve holes, respectively. Distributing valves are slidably fitted in the valve holes for connecting the ports alternately to the inner oil passage and the outer oil passage. Swash plate holders, swash plates and eccentric rings supported on the swash plate holders so as to be engaged with the outer ends of the distributing valves respectively, are provided. Plungers are slidably fitted in the cylinder bores, respectively, in which the displacement can be changed whether or not the inclination of the swash plates is variable. Eccentric radius changing mechanisms for changing the effective stroke of plungers by changing the eccentric radii of eccentric rings relative to cylinders are connected to the eccentric rings capable of being moved radially of the cylinders.
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