Self-pumping, hydropneumatic suspension strut unit

Details Self-pumping, hydropneumatic suspension strut unit Self-pumping, hydropneumatic suspension strut unit

2005-03-29

2005-03-29

Siconolfi, Robert A. (Department: 3683)

Spring devices

Vehicle

Comprising compressible fluid

C267S064260

Reexamination Certificate

active

06871845

ABSTRACT:
A self-pumping, hydropneumatic suspension strut unit with an internal level control for a vehicle includes a low pressure chamber and a high pressure chamber for storing a damping medium under pressure. The high pressure chamber includes a gas cushion for displacing the damping medium therefrom when the damping medium is under less than a predetermined pressure. A working cylinder has a piston that defines a first volume of the working cylinder in fluid communication with the high pressure chamber. A piston rod is axially displaceable in inward and outward relative to the working cylinder. A pumping rod is axially mounted at one end in the working cylinder and a regulating bore is disposed at a first location of the pumping rod. The bore is closed when the first location is received in the piston rod and places the low pressure chamber in two-way fluid communication with the first volume when the regulating bore is open. A cavity is located axially in the piston rod for receiving the pumping rod and provides a one-way fluid communication from the low pressure chamber to the first volume. A bypass is disposed at a second location on the pumping rod and is closed when the second location is received in the piston rod for placing the cavity in fluid communication with the first volume when the bypass is open. The piston rod is elastically urged in the inward direction so that when the pressures in the low and high pressure chambers are equal, the piston rod and pump rod cooperatively increase the high pressure chamber pressure to the predetermined pressure whereupon the damping medium displaces the piston outward until the regulating bore hole is open to equalize the pressure of the low and high pressure chambers.

REFERENCES:
patent: 5062616 (1991-11-01), Sommer
patent: 5423402 (1995-06-01), de Kock
patent: 5464079 (1995-11-01), Lohberg et al.
patent: 5826862 (1998-10-01), Beck
patent: 6494441 (2002-12-01), Beck et al.

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