Self-pumping hydropneumatic suspension strut unit

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

2005-02-08

2008-09-09

Siconolfi, Robert A. (Department: 3683)

Spring devices

Vehicle

Comprising compressible fluid

C188S315000, C188S322140

Reexamination Certificate

active

07422199

ABSTRACT:
Self-pumping hydropneumatic suspension strut unit with internal level control, with an oil-filled working cylinder subject to the pressure of gas cushions and with a damping piston, which is free to slide inside the cylinder and is mounted at the end of a hollow piston rod, the cavity of which serves as a pump cylinder for a pump rod attached to the working cylinder. Oil is drawn from a reservoir space when the piston rod travels outward, whereas the oil is conveyed into the working space when the piston rod travels inward. The pump rod passes through the end wall of the working space and is held axially in position by an end-mounted disk formed as a Belleville washer, which acts as a universal joint for the rod. The disk engages in a groove in the pump rod and is held in place by its outer circumference axially between the working cylinder and the end wall of the working cylinder. The disk has a slot to accept the pump rod, the first area of this slot having a diameter corresponding to the base of the groove, whereas the second area has a diameter corresponding to the outside diameter of the pump rod.

REFERENCES:
patent: 972434 (1910-10-01), Blomberg
patent: 3592164 (1971-07-01), Schultze
patent: 4502672 (1985-03-01), Meller et al.
patent: 4577840 (1986-03-01), Meller et al.
patent: 5797594 (1998-08-01), Sekine et al.
patent: 5826862 (1998-10-01), Beck
patent: 5826863 (1998-10-01), Beck
patent: 5857665 (1999-01-01), Beck
patent: 5988655 (1999-11-01), Sakai et al.
patent: 33 18 939 (1984-11-01), None
Wikipedia, the free encyclopedia, “Belleville washer”, pp. 1-3.

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