Patent ID: 8783224

Claim:
A crankshaftless internal combustion engine, comprising: an engine block having a plurality of cylinders each having a reciprocating power system and controlled in a deactivated state and an activated state, a cylinder head including a valve system for exhausting air as well as supplying fuel required in each cylinder, and an oil pan provided below the cylinder head; a power shaft unit converting a power generated from a power system of an activated cylinder into an engine output and transferring the engine output to a transmission without transferring the engine output to a power system of a deactivated cylinder; a cylinder separator controlled by an ECU operating the plurality of cylinders as the deactivated cylinder and the activated cylinder and controlled by the ECU to separate the power system of the deactivated cylinder from the power shaft unit; and a compression changing unit controlled by the ECU so as to vary a compression ratio of the activated cylinder in multistage.