BLOW-BY GAS CIRCULATION DEVICE FOR INTERNAL COMBUSTION ENGINE, CIRCULATING BLOW-BY GAS TO ENGINE CYLINDER

摘要

PURPOSE: A blow-by gas circulation device for an internal combustion engine is provided to have a blow-by gas passage uniformly distributing blow-by gas to an engine cylinder without increasing the size of components cooperating with each other to form a bow-by gas passage and the cylinder. CONSTITUTION: A blow-by gas circulation device for an internal combustion engine circulates blow-by gas to engine cylinders each having suction ports(6). The blow-by gas circulation device includes a cylinder head cover(2) having a first wall defining a first passage(11) and a first flange extended outward from the first wall, and a cylinder head(1) having a second wall and a second flange constituting an adjacent surface by cooperating with the first flange. A second passage(13) is arranged to the second flange. The second passage is connected to the first passage and is extended in a direction of a line of the engine cylinder. The second wall defines plural third passages(14) opened to the second flange. The third passage has one end communicating with the second passage and the opposite end opened to the suction port of each engine cylinder.