Arrangement in a hydraulic cylinder
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United States of America Patent
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Jul 28, 1998
Grant Date -
N/A
app pub date -
Mar 13, 1997
filing date -
Mar 15, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic actuator includes three cylinder spaces: a first cylinder space (6) located between a ring piston and a cylinder; a second cylinder space (7) between the ring piston and an auxiliary piston inside a hollow piston rod connected to the ring piston; and the third cylinder space (8) formed between the ring piston, the cylinder and the hollow piston rod. The hydraulic actuator includes a non-return valve (11) mounted in the ring piston between the second cylinder space and the third cylinder space, allowing flow from the second cylinder space into the third cylinder space when pressure in the second cylinder space exceeds pressure in the third cylinder space; a non-return valve (10) mounted in the ring piston between the second cylinder space and the first cylinder space, allowing flow from the second cylinder space into the first cylinder space when pressure in the second cylinder space exceeds pressure in the first cylinder space; and a pressure limit valve (14) for controlling fluid flow into the cylinder spaces depending on pressure in the first channel when the actuator is lengthened.
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