| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a reservoir built-in type actuator capable of exhibiting a stable performance without being influenced by an external force acting on the actuator and capable of attaining the miniaturization of an entire EHA device. <P>SOLUTION: By arranging a stand pipe so as to be fitted with an inner peripheral surface of a piston rod with a hollow structure and by incorporating a reservoir into the inside of the stand pipe, it becomes possible to attain miniaturization of the entire EHA device. Besides, since the reservoir is separated from an annulus-side oil chamber and a bore-side oil chamber, a stable reservoir performance can be expected without being influenced by fluid pressure which is attributable to an external force. Further, by providing the stand pipe, the difference between the amount of fluid required per unit stroke in the annulus-side oil chamber and that in the bore-side oil chamber becomes smaller, thus making it possible to miniaturize the reservoir oil chamber. Accordingly, it is possible to provide the effective EHA device in which an amount of energy consumed during compression and that consumed during elongation are hardly different from each other. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
