Self-pumping hydropneumatic spring strut

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

2006-07-25

2009-08-04

Burch, Melody M (Department: 3657)

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

C267S064170, C267S217000

Reexamination Certificate

active

07568562

ABSTRACT:
A self-pumping hydropneumatic spring strut includes an oil-filled working cylinder which is divided into two working spaces by a working piston carried by a hollow piston rod. Two high-pressure chambers connectable to the cylinder in such that the piston rod is selectively supported in both directions of movement either on a gas cushion provided by the first high-pressure chamber, the second high-pressure chamber, or both high-pressure chambers. Further, the spring strut includes a piston pump driven by the movements of the piston rod and for conveying oil from a low-pressure chamber to the working space which is connected to at least one of the high-pressure chambers. Moreover, a control channel connects the working space, which is connected to at least one of the high-pressure chambers, to the low-pressure chamber via a control opening, which can be closed as a function of the position of the working piston in the working cylinder.

REFERENCES:
patent: 3610656 (1971-10-01), Klees
patent: 5062616 (1991-11-01), Sommer
patent: 5941508 (1999-08-01), Murata et al.
patent: 6092816 (2000-07-01), Sekine et al.
patent: 6220584 (2001-04-01), Meyer
patent: 6871845 (2005-03-01), Beck
patent: 196 48 859 (1998-05-01), None

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