F - Mech Eng,Light,Heat,Weapons – 02 – B
Patent
F - Mech Eng,Light,Heat,Weapons
02
B
171/17
F02B 25/16 (2006.01) F01L 3/20 (2006.01) F02B 25/22 (2006.01) F02B 33/04 (2006.01) F02B 33/44 (2006.01) F02B 75/02 (2006.01)
Patent
CA 1248027
ABSTRACT OF THE DISCLOSURE The two-cycle internal combustion engine has a crankcase, a combustion chamber including an exhaust port, a fuel intake port and a pair of air-intake ports located on the opposite sides of the fuel intake port, and a piston movable relative to the combustion chamber between top dead center and bottom dead center positions. The crankcase has separate air and fuel inlets and includes interior portions defining an air crankcase portion which communicates with the crankcase air inlet and with two air transfer passages which communicate with the air intake ports and a separate fuel crankcase portion which communicates with the crankcase fuel inlet and a fuel transfer passage which communicates with the fuel intake port. Air is drawn through the crankcase air inlet into the air crankcase portion and a fuel-air mixture is drawn through the crankcase fuel inlet into the fuel crankcase portion during the upstroke of the piston toward top dead center. During the downstroke of the piston toward bottom dead center, air flows from air crankcase portion into both air transfer passages and the fuel-air mixture is kept separate from the air as it flows from the fuel crankcase portion into the fuel transfer passage. The exhaust, air intake and fuel intake ports are located relative to each other so that the air intake ports are uncovered to admit air into the combustion chamber for scavenging the exhaust gases through the exhaust port before the fuel intake port is uncovered.
498855
Outboard Marine Corporation
Smart & Biggar
LandOfFree
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