Engine construction

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

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Details

F02F 7/00 (2006.01) F02B 61/04 (2006.01) F02B 75/24 (2006.01)

Patent

CA 2321099

An in-line opposed cylinder engine (10) constructed of a pair of half blocks (42, 44) which when combined form a pair of spaced cylinder heads (46, 48) and an intermediate crankcase (50) and in which the cylinder heads (46, 48) and the intermediate crankcase (50) are tied together by a plurality of spaced elongated through bolts (56) which extend through the cylinder heads (46, 48) and through the half blocks (42, 44). Each cylinder head (46, 48) is integral with the remainder of the half block (42, 44) and is preferably of a composite construction with a core (70) of steel or the like which forms the cylinder bore (22, 24, 122, 124), the firing deck (72), the exhaust ports (74) and the valve guide (76) as well as the main bearing supports. A matrix structure (78) of lighter material such as aluminum is cast around the core (70) and forms the induction air passages to the intake ports, the coolant passages (80), oil passages, and the main bearing bosses (82).

L'invention concerne un moteur (10) à cylindres opposés en ligne constitué d'une paire de demi-blocs (42, 44) qui, une fois combinés, forment une paire de culasses (46, 48) espacées, et d'un carter (50) intermédiaire. Dans ce moteur, les culasses (46, 48) et le carter (50) intermédiaire sont assemblés à l'aide d'une pluralité de tirants (56) allongés et espacés traversant les culasses (46, 48) et les demi-blocs (42, 44). Chaque culasse (46, 48), formée d'une seule pièce avec le reste du demi-bloc (42, 44), est constituée, de préférence, d'un corps composite dont la partie centrale (70) en acier ou autre métal forme l'alésage (22, 24, 122, 124) du cylindre, le plancher (72) d'allumage, les orifices (74) d'échappement et le guide-soupape (76), ainsi que les supports de palier principaux. Une structure matricielle (78) légère en poids telle que l'aluminium est coulée autour de la partie centrale (70) pour former les passages d'air à induction conduisant vers les orifices d'entrée, les passages (80) de refroidissement, les passages d'huile et les protubérances (82) de paliers principales.

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