Gas spring with tubular shell seal

Spring devices – Vehicle – Comprising compressible fluid

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Details

188298, 188315, 18832217, 267122, 277 3, 277 27, F16F 904

Patent

active

043424473

ABSTRACT:
A gas spring comprises a piston assembly slidable in a cylinder closed at one end and open at the other with a rod connected to the piston assembly and projecting through the open end of the cylinder. This open end is sealed by a sealing assembly and the interior of the cylinder contains a body of oil and a gas under pressure. The sealing assembly includes a shell of resilient material with one annular portion in sealing engagement with the rod, a second annular portion in sealing engagement with the inner wall of the cylinder, and a cavity containing a reservoir of oil. When the pressure in the cavity is less than the pressure in the cylinder, the inner portion of the shell collapses and, when the pressure differential is reversed, the inner end of the shell opens to permit oil to flow from the cavity to the cylinder. In either case, however, the action of the shell is such as to maintain the sealing action of each annular portion of the shell.

REFERENCES:
patent: 3415162 (1968-12-01), Willis et al.
patent: 3750855 (1973-08-01), Peddinghaus
patent: 3865356 (1975-02-01), Wossner
patent: 4005769 (1977-02-01), Itoh
patent: 4044866 (1977-08-01), Ishida
patent: 4079925 (1978-03-01), Salin
patent: 4108423 (1978-08-01), Skubal
patent: 4189033 (1980-02-01), Katsumori

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