Secondary piston seal

Details Secondary piston seal Secondary piston seal

2007-03-13

2007-03-13

Pickard, Alison (Department: 3673)

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

C277S437000, C277S453000, C277S454000

Reexamination Certificate

active

11036670

ABSTRACT:
A secondary seal is provided for an internal combustion engine having a piston, cylinder bore, ring seal, secondary seal, and leak path. Forces are applied from the combustion side of the piston through a cylinder gap and a leak path to the secondary seal. The secondary seal, seated on the piston and ring seal, transmits the forces generally axially to the piston and ring seal, thereby controllably limiting the radial force between the ring seal and cylinder bore.

REFERENCES:
patent: 2052077 (1936-08-01), Bristow
patent: 2631907 (1953-03-01), Johnson, Jr.
patent: 2967745 (1961-01-01), Stevens
patent: 4669369 (1987-06-01), Holt et al.
patent: 5001965 (1991-03-01), Ruddy et al.
patent: 5253877 (1993-10-01), DeBiasse et al.
patent: 5474307 (1995-12-01), DeBiasse et al.
patent: 6705616 (2004-03-01), Fujii et al.
patent: 1515792 (2004-07-01), None
patent: 2117868 (1983-10-01), None
patent: 60-109668 (1985-06-01), None
English Abstract for CN-1515792-A (1 page).

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