Self-pumping hydropneumatic suspension strut

Details Self-pumping hydropneumatic suspension strut Self-pumping hydropneumatic suspension strut

2006-05-02

2006-05-02

Torres, Melanie (Department: 3683)

Spring devices

Vehicle

Comprising compressible fluid

C267S064190, C267S064230, C267S064260, C267S064280

Reexamination Certificate

active

07036802

ABSTRACT:
A suspension strut includes an outer tube having a first filling opening and a second filling opening, an intermediate wall received in the outer tube and separating a high pressure chamber from a low pressure chamber, a working cylinder located concentrically inside the outer tube in the high pressure chamber, and a gas filled separating envelope located between the working cylinder and the outer tube for pressurizing damping medium in the high pressure chamber. An axially displaceable piston divides the working cylinder into a first working space and a second working space, the first working space being connected to the high pressure chamber. A hollow piston rod passing through the second working space transports damping medium from the low pressure chamber to the first working space. A pump rod fixed to the intermediate wall and received in the hollow piston rod forms a pump cylinder, the pump rod having a suction tube extending into the low pressure chamber for transporting damping fluid from the low pressure chamber to the piston rod. A gas lock device fitted to suction tube prevents flow of gas from the low pressure chamber into the suction tube when the low pressure chamber is filled with damping medium and gas, and the suspension strut is vertically oriented with the low pressure chamber at the top.

REFERENCES:
patent: 3033556 (1962-05-01), Wossner
patent: 3218052 (1965-11-01), Peterson
patent: 4502672 (1985-03-01), Meller et al.
patent: 4624346 (1986-11-01), Katz
patent: 5062616 (1991-11-01), Sommer
patent: 5564680 (1996-10-01), Sano et al.
patent: 6648309 (2003-11-01), Beck
patent: 2002/0105118 (2002-08-01), Beck

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