Gas introducing structure of intake path

摘要

A gas introducing structure of an intake path includes a gas introducing path (10, 12, 14, 16) introducing a gas into an intake airflow in the intake path of an internal combustion engine, wherein an inner peripheral surface of the gas introducing path (10, 12, 14, 16) is made of a bottom surface (10a, 12a, 14a, 16a) appearing as a straight line at a lower side of a perpendicular cross section of the inner peripheral surface and a curved wall surface (10b, 12b, 14b, 16b) appearing as a convex curved line, connecting with each end of the straight line at an angle, at an upper side of the perpendicular cross section of the inner peripheral surface.