| 摘要 |
A double-acting hydraulic piston comprises a cylinder which has a first piston disposed therein in such a manner as to divide the cylinder into first and second fluid chambers. The first piston is attached to a shaft which extends through one end of the cylinder and is reciprocable within the cylinder. The first and second fluid chambers are connected to each other by a connecting mechanism so that fluid is able to pass from the first chamber to the second chamber, and visa versa, as the first piston is reciprocated within the cylinder. A second piston is disposed within the connecting mechanism. The second piston has a passage therethrough to allow for transfer of fluid from one fluid chamber to the other as the first piston is reciprocated within the cylinder. The second piston moves in response to movements of the first piston, thereby effectively altering the capacity of the first and second fluid chambers to accommodate fluid as it is forced from one fluid chamber to the other by the movement of the first piston. A mechanism is provided to compensate for the change in the length of the shaft as the first piston is reciprocated within the cylinder. The double-acting hydraulic piston is operable in both the "push" and "pull" directions.
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