Patent ID: 7137380
Filing Date: 2006-11-21
Classification: F02B,Y02T

Abstract:
1. An internal combustion engine comprising: a cylinder having a cylinder inner surface; a cylinder head that cooperates with the cylinder inner surface to define a combustion chamber and has a head inner surface including an intake opening through which an intake gas is introduced into the combustion chamber; an intake valve that opens and closes the intake opening; an ignition plug provided on the cylinder head; and an intake drifting mechanism that causes the intake gas to drift toward an axis of the cylinder in the intake opening and generates a vortex flow in the combustion chamber; wherein when the intake valve is opened, a minimum gap between the intake valve and the head inner surface is equal to or larger than a gap between the intake valve and the cylinder inner surface in a diametrical direction of the cylinder, and the minimum gap between the intake valve and the head inner surface in the vicinity of the cylinder inner surface is smaller than other portions of the gap between the intake valve and the head inner surface.