Combustion chamber system having an improved valve arrangement

F - Mech Eng,Light,Heat,Weapons – 02 – F

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F02F 1/42 (2006.01) F01L 1/26 (2006.01) F02B 23/08 (2006.01) F02F 1/24 (2006.01) F02P 15/08 (2006.01) F02B 3/06 (2006.01)

Patent

CA 2286693

An intake and exhaust system that uses two intake valves (14) and one exhaust valve (16) for each engine combustion chamber (12) spaced around the cylinder centerline in the cylinder head (10). One or more spark plugs (18) or other ignition devices are provided in the head (10) on the cylinder centerline and/or between pairs of adjacent valves. Preferably, the ratio of exhaust valve diameter to intake valve diameter is from about 0.95:1 to 1:1.2. A substantially hemispheric depression may be provided for each valve (14, 16). Squish areas are preferably provided around the periphery of combustion chamber (12).

Cette invention se rapporte à un système d'admission et échappement qui utilise deux soupapes d'admission (14) et une soupape d'échappement (16) pour chaque chambre de combustion (12) du moteur, disposées à distance l'une de l'autre autour de l'axe du cylindre dans la culasse (10). La culasse est équipée d'au moins une bougie d'allumage (18) ou autre dispositif d'allumage, sur l'axe du cylindre et/ou entre des paires de soupapes adjacentes. De préférence, le rapport du diamètre de la soupape d'échappement au diamètre de la soupape d'admission est compris entre 0,95:1 et 1:1,2. Chacune des soupapes (14, 16) peut être logée à l'intérieur d'une dépression sensiblement hémisphérique. Des zones de pression de fin de compression sont de préférence disposées sur la périphérie d'une chambre de combustion (12).

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