Four-stroke internal combustion engine

Details Four-stroke internal combustion engine Four-stroke internal combustion engine

1994-04-01

1996-12-03

McMahon, Marguerite

Internal-combustion engines

Four-cycle

Crankcase compression of air or combustible mixture to be...

123 9038, F02B 7502

Patent

active

055797350

ABSTRACT:
A four-stroke engine comprising an engine frame including a block and a head, the block forming at least one cylinder and a crankcase. A piston is mounted for reciprocation in the cylinder, and a crank and connecting rod are mounted in the crankcase and connected to the piston. The crankcase includes a fuel inlet port and an outlet port, and a duct connects the outlet port to an intake passage in the head. The inlet port is connected to a supply of a combustible mixture comprising fuel, lubricating oil and air. During engine operation, the mixture flows through the crankcase, the duct, and the air intake passage to the cylinder. Valves and valve actuating mechanisms control the flow of the mixture to the cylinder and the flow of exhaust from the cylinder. The oil in the mixture lubricates the engine parts in the crankcase, the valves and the valve actuating mechanisms. The duct preferably forms a plenum or surge tank containing the mixture under pressure. The engine may include more than one cylinder and piston, such as a two-cylinder engine having pistons which move in synchronism to produce crankcase compression.

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