Intake structure of internal combustion engine with bypass intake passage for mounting air flow meter

An intake structure for an internal combustion engine comprising:

• a first body having therein a main passage through which intake air is introduced to said engine and a bypass passage bypass a portion of said main passage and accommodating an air flow sensor therein;
• a second body connected to said first body and having therein an intake passage in which is disposed a throttle valve;
• locating projection means provided on the joint surface of one of said first body and said second body;
• and
• locating recess means formed in the joint surface of the other of said first and second bodies, said locating projection means and said locating recess means being adapted to fit each other and being determined such that, when said locating projection means and said locating recess means fit each other, said first and second members are positioned substantially coaxially to each other, wherein said locating projection means includes a pair of cylindrical projections, while said locating recess means includes a cylindrical hole for engaging one of said cylindrical projections and an elongated hole for engaging the other of said cylindrical projections.