Self-pumping hydropneumatic spring strut unit

Details Self-pumping hydropneumatic spring strut unit Self-pumping hydropneumatic spring strut unit

2008-05-13

2008-05-13

Torres, Melanie (Department: 3683)

Spring devices

Vehicle

Comprising compressible fluid

C267S064140, C267SDIG003, C188S313000

Reexamination Certificate

active

11240345

ABSTRACT:
A self-pumping hydropneumatic spring strut unit includes a working cylinder filled with oil under pressure and a piston and rod unit displaceable in the cylinder so as to define two working spaces in the cylinder, and high-pressure and low pressure chambers surrounding the cylinder. The strut unit further has a piston pump operable to transport a working medium from the low-pressure chamber into the one working space which is in flow communication with the high-pressure chamber. The piston pump has a cylinder defined by the inner surface of the piston rod unit, and a hollow pump rod coupled to the working cylinder and having a flow channel in communication with the low-pressure chamber. The flow channel has a deregulating opening on the working space and a throttle in flow communication with the deregulating opening. A filter device protects the throttle from impurities carried by the oil during flow from the deregulating opening to the low pressure chamber.

REFERENCES:
patent: 3658313 (1972-04-01), Hahn
patent: 3837444 (1974-09-01), Allinquant et al.
patent: 3904183 (1975-09-01), Allinquant et al.
patent: 4657228 (1987-04-01), Lautzenhiser
patent: 5217212 (1993-06-01), Chorkey et al.
patent: 6202993 (2001-03-01), Wilms et al.
patent: 6494442 (2002-12-01), Beck et al.
patent: 198 57 595 (1999-10-01), None

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