Valve stem seal assembly

Details Valve stem seal assembly Valve stem seal assembly

1992-06-18

1993-08-24

Wolfe, Willis R.

Internal-combustion engines

Valve

Packing

F01L 308, F16J 1532

Patent

active

052379710

ABSTRACT:
A valve stem seal assembly for installation about a valve stem surrounded by a valve guide includes a sleeve-like elastomer body having the following four components: (1) an annular, outer, oil-sealing lip for sealingly surrounding the valve stem in the installed state of the seal assembly; (2) an annular, inner, gas-sealing lip for sealingly surrounding the valve stem in the installed state of the seal assembly; (3) a diaphragm situated axially between the oil-sealing lip and the gas-sealing lip and being connected to the oil-sealing lip; and (4) a generally cylindrical mounting part for surrounding and engaging the valve guide in the installed state of the seal assembly. The gas-sealing lip is directly connected with the mounting part externally of a region of the diaphragm. The seal assembly further has a rigid housing surrounding and contacting the mounting part; and a pressure-stable zone between the gas-sealing lip and the diaphragm for separating the oil-sealing lip from the gas-sealing lip with respect to vibrations.

REFERENCES:
patent: 4325558 (1982-04-01), Poggio
patent: 4336945 (1982-06-01), Christiansen et al.
patent: 4508020 (1985-04-01), Szcupak
patent: 4527673 (1985-07-01), Szcupak
patent: 4747605 (1988-05-01), Antonini
patent: 4947811 (1990-08-01), Binford
patent: 4993379 (1991-02-01), Viazzi
patent: 5167419 (1992-12-01), Robertson
patent: 5174256 (1992-12-01), Binford
patent: 5178243 (1993-01-01), Hamada et al.
patent: 5186472 (1993-02-01), Romero et al.
"Valve Stem Seals Handle Oil Metering and Wear", 372 Automotive Engineering, vol. 90 (Jan.-1982), No. 1, pp. 75-78.
GOETZE Ventilschaftdichtringe, Sep. 1981, 4 pages (cover pages and pp. 8,9).

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