Self-pumping hydropneumatic spring strut

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

2008-09-08

2011-11-08

Williams, Melanie Torres (Department: 3657)

Spring devices

Vehicle

Comprising compressible fluid

C188S313000, C267SDIG003, C267S064190

Reexamination Certificate

active

08052128

ABSTRACT:
A self-pumping hydropneumatic spring strut with internal leveling control, particularly for motor vehicles, has an outer tube having an oil-filled high-pressure work space in the work cylinder, which high-pressure work space is under pressure by at least one gas cushion which is arranged in a high-pressure chamber and acts as a spring, a second work space on the piston rod side, and a piston which is supported by a hollow piston rod and which is axially displaceable in the work cylinder in a sealed manner, a piston pump which is driven by the spring movement of the vehicle and pumps oil out of a low-pressure chamber into the work space connected to the high-pressure chamber and which comprises a pump rod and a pump cylinder which is formed by the hollow piston rod, and the high-pressure chamber can be connected to the atmosphere by a flow connection which is arranged in the piston rod guide and has a closing element. The piston rod is sealed in the piston rod guide by means of at least two seals which are arranged one behind the other axially. A flow connection extends from between two adjacent seals into the low-pressure chamber. The flow connection is acted upon by a check valve which passes damping medium only in direction of the low-pressure chamber.

REFERENCES:
patent: 4624346 (1986-11-01), Katz
patent: 5713562 (1998-02-01), Beck
patent: 6648309 (2003-11-01), Beck
patent: 7036802 (2006-05-01), Beck
patent: 7370849 (2008-05-01), Beck
patent: 101 04 358 (2002-10-01), None

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