Patent ID: 7565897

Claim:
An internal combustion engine, comprising: a piston slidably fitted in a cylinder bore; a combustion chamber formed between a cylinder block and a cylinder head, a top portion of said piston fronting said combustion chamber; an intake valve port that is opened and closed by an intake valve, said intake valve port being provided in said cylinder head to open into the combustion chamber on one side of a plane containing an axis of the cylinder bore; an exhaust valve port that is opened and closed by an exhaust valve, said exhaust valve port being provided in said cylinder head to open into the combustion chamber on the other side of said plane; and a spark plug having a tip end that fronts a substantially central portion of said combustion chamber, said spark plug being attached to said cylinder head and being disposed between said intake valve and said exhaust valve, wherein an operation axis of said intake valve is set to be substantially parallel to the axis of said cylinder bore, and wherein a ceiling surface of said combustion chamber is provided, between said spark plug and said intake valve port, with a partition wall projecting toward said piston.