Two-piece valve stem seal

Details Two-piece valve stem seal Two-piece valve stem seal

2005-06-07

2005-06-07

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Valve

Packing

Reexamination Certificate

active

06901902

ABSTRACT:
A two piece valve stem seal assembly including first and second generally cylindrical shells, one of which is partially axially nested or inserted within the other. The valve stem seal assembly also includes an engagement portion on the one of the shells for grippingly engaging the outer shell in order to substantially prevent or at least minimize the possibility of axial separation of the shells during subsequent assembly into an engine or other valve-containing device. The assembly may also optionally include a discontinuity on the one of the shells for axially retaining or axially interlocking the shells in order to substantially prevent or at least minimize such possibility of axial separation.

REFERENCES:
patent: 3554180 (1971-01-01), Lesser
patent: 3554562 (1971-01-01), Davis, Jr.
patent: 4909202 (1990-03-01), Binford et al.
patent: 4947811 (1990-08-01), Binford
patent: 5558056 (1996-09-01), Sakata
patent: 5775284 (1998-07-01), Kirchner et al.

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