Timing advancement for exhaust valve in internal combustion...

Details Timing advancement for exhaust valve in internal combustion... Timing advancement for exhaust valve in internal combustion...

2006-05-09

2006-05-09

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090160, C123S090170

Reexamination Certificate

active

07040264

ABSTRACT:
An internal combustion engine having a timing device for advancing operation of an exhaust valve, and a method of operating the exhaust valve, wherein, for the case of a conventional automotive engine, the timing device opens the exhaust valve less than 90 degrees before bottom dead center in a terminal portion of the power stroke of the engine, but more than approximately 30 degrees before the bottom dead center. The engine is a four-stroke engine, and the open interval of the exhaust valve extends from a terminal portion of the power stroke into the exhaust stroke. The advancement in the opening of the exhaust valve reduces fuel consumption.

REFERENCES:
patent: 3703164 (1972-11-01), Weaving
patent: 4205634 (1980-06-01), Tourtelot, Jr.
patent: 4382428 (1983-05-01), Tourtelot, Jr.
patent: 4438737 (1984-03-01), Burandt
patent: 4805571 (1989-02-01), Humphrey
patent: 5205247 (1993-04-01), Hoffman
patent: 6601563 (2003-08-01), Funke et al.

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