Outward-opening gas-exchange valve system for an internal...

Details Outward-opening gas-exchange valve system for an internal... Outward-opening gas-exchange valve system for an internal...

2008-05-27

2008-05-27

Kwon, John T. (Department: 3747)

Internal-combustion engines

Valve

Valve seat relation

C123S07900R

Reexamination Certificate

active

07377249

ABSTRACT:
An outwardly-opening gas-exchange valve assembly for an internal combustion engine. The valve assembly includes a port in a firing chamber in an engine head, the port having a valve seat on a side opposite from the firing chamber. A piston-shaped poppet valve head slides in a bore in the engine head for mating with the valve seat to occlude passage of gas across the valve seat. Withdrawal of the poppet valve head from the seat opens the firing chamber to communication with an intake or exhaust manifold runner in the engine head. The poppet valve head may be actuated by an overcenter lever arrangement actuated selectively by hydraulic pressure or mechanical actuation. In a preferred embodiment, OO intake and exhaust valves are radially arranged in a hemispherical fire deck and may include an adjustable pitch helical channel to induce swirl to the incoming gas.

REFERENCES:
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patent: 5709178 (1998-01-01), Feucht
patent: 5819693 (1998-10-01), Curtil
patent: 6223846 (2001-05-01), Schechter
patent: 7104230 (2006-09-01), Fujii et al.
patent: 7200889 (2007-04-01), Vohra
Regueiro, Jose F. and Kosina, Vladimir; “Rotular Tappet Valve Trains for Hemispherical Combustion Chambers”; SAE Technical Paper Series 960058; Reprinted from: Applications of New Diesel Engine and Component Design (SP-1158); International Congress & Exposition; Detroit, MI; Feb. 26-29, 1996.
Mello, J. P., and Linna, J.R.; “Homogeneous Charge Compression Ignition (HCCI)—The Pathway to Clean Diesel Engines?”; TIAX, LLC; Cambridge, Mass; Jan. 30, 2003.

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