4-cycle engine

Details 4-cycle engine 4-cycle engine

F - Mech Eng,Light,Heat,Weapons

02

B

F02B 25/00 (2006.01) F01L 7/02 (2006.01) F02B 33/26 (2006.01) F02B 33/30 (2006.01) F02B 3/06 (2006.01) F02B 75/02 (2006.01)

Patent

CA 2071458

The known 4-cycle internal combustion engine including a crankcase, a cylinder, a cylinder head, a piston adapted to reciprocate within the cylinder, a combustion chamber formed by the piston, the cylinder and the cylinder head, and a crankshaft connected to the piston via a connecting rod, is improved in order to enhance a thermal efficiency, to lower an exhaust level of fuel and to make it possible to arbitrarily select-an operation attitude of a 4-cycle engine. The improved 4-cycle engine comprises an intake passage and an exhaust passage provided in the cylinder head, a rotary valve rotating synchronously with the crankshaft at a speed one-half of that of the latter for communicating the intake passage and the exhaust passage with the cylinder respectively at the time of an intake stroke and at the time of an exhaust stroke, a check valve communicating the intake passage with a crankcase chamber to allow only a flow directed towards the intake passage, and fuel feed means for feeding mixture gas of air, fuel and lubricant oil into the crankcase chamber. Thereby, suction of the mixture gas into the crankcase chamber as well as feed of the mixture gas into within the crankcase chamber to the intake passage are made possible by variation of the pressure within the crankcase chamber caused by reciprocating motion of the piston.

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