CRANK SHAFTLESS INTERNAL COMBUSTION ENGINE

PURPOSE: An internal combustion engine without a crank shaft is provided to solve decrease in fuel efficiency by variably operating a cylinder according to a vehicle condition. CONSTITUTION: An internal combustion engine without a crank shaft comprises an engine block(1), a power shaft(10), and a cylinder separator(30). The engine block is in a driving or dormant sate, and comprises a plurality of cylinders with a power system. The engine block comprises a cylinder head with a valve system for combustion exhaust and fuel supply, and comprises an oil pan at the lower part. A power shaft unit converts the power from the power system into engine output to be delivered to a transmission. The power from the power system is not converted into the engine output when the engine output is in a dormant state. The cylinder separator separates the power system from the power shaft unit by an engine control unit(60) which operates a plurality of cylinders. [Reference numerals] (AA) Vehicle information; (BB) Battery; (CC) Output Tb