Spring devices – Vehicle – Comprising compressible fluid
Reexamination Certificate
2006-10-05
2008-03-18
Schwartz, Christopher P. (Department: 3683)
Spring devices
Vehicle
Comprising compressible fluid
C267S064160
Reexamination Certificate
active
07344127
ABSTRACT:
The self-pumping hydropneumatic spring strut with an internal level control includes a cylinder having a high-pressure chamber and a low-pressure chamber, both chambers being at least partially filled with oil, the high-pressure chamber further comprising a gas cushion acting as a spring element. The spring strut also has an axially movable hollow piston rod arranged within the cylinder and carrying a working piston separating two working spaces arranged in the cylinder, one of the working spaces being connected to the high-pressure chamber, and a piston pump, which is driven by movements of the spring element, thus conveying oil from the low-pressure chamber to the working space connected to the high-pressure chamber. The piston pump includes a flow connection, which connects the high-pressure chamber to the low-pressure chamber. An adjustable valve is arranged in the flow connection, the valve opening as a function of pressure and thus allowing the oil to pass from the high-pressure chamber to the low-pressure chamber.
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Cohen Pontani Lieberman & Pavane LLP
Schwartz Christopher P.
ZF Friedrichshafen AG
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