AIR INTAKE DEVICE OF MULTICYLINDER ENGINE

摘要

PURPOSE:To facilitate incorporation of a fuel injection valve by dividing an air intake expansion chamber to which one end of each independent air intake passage whose the other end is connected to each cylinder is connected into upper and lower sides on a position lower than a central extending line of the fuel injection valve. CONSTITUTION:Each independent air intake passage 6 is opened to a combustion chamber 5 of each cylinder 4 through an intake port 7 formed in a cylinder head and forming a lower steam end unit. And each upper stream end is connected to an or intake expansion chamber 8 extending in parallel with engine longitudinal direction respectively. And an air intake system structure 12 for forming the chamber 8 and each passage 6 is divided into upper and lower portions on a position lower than acentral extension line l of the fuel injection valve 19 in a tank portion 13 on which the chamber 8 is formed, and composed of an upper side divided body 12a forming the tank portion 13 and respective upper half portions of respective integral air intake units 14 integrally, and a lower side divided body 12b forming the lower half portions of the units 14 and respective branched intake pipe units 15 and flanges 16 integrally.