INTERNAL COMBUSTION ENGINE

摘要

An intake port of an internal combustion engine is connected to a combustion chamber and includes a connecting portion having a passage cross-sectional area that increases as the connecting portion approaches the combustion chamber, and an upstream portion connected to an upstream end of the connecting portion. The connecting portion is provided at its downstream end with a valve seat with which an umbrella part of an intake valve is brought into contact. At least one recess extending in an extending direction of the intake port and included in the connecting portion and the upstream portion is provided at least at one of two portions, the two portions located on both sides in an extending direction of an output shaft, of a peripheral surface of the intake port.

主权项

1. An internal combustion engine that is configured to introduce intake air to a combustion chamber and generate a tumble flow in the combustion chamber, the internal combustion engine comprising:
a cylinder head including an intake port connected to the combustion chamber; an intake valve including an intake umbrella part; and an output shaft,wherein
the intake port includes a connecting portion and an upstream portion, the connecting portion has a passage cross-sectional area that increases as the connecting portion approaches the combustion chamber, and the upstream portion is connected to an upstream end of the connecting portion, the intake port includes a valve seat provided at a downstream end of the connecting portion, and the intake umbrella part of the intake valve is configured to contact the valve seat, and the intake port has at least one recess provided at least at one of two portions, the two portions located on both sides in an extending direction of the output shaft, of a peripheral surface of the intake port, the at least one recess extends in an extending direction of the intake port and is included in the connecting portion and the upstream portion.