| 摘要 |
PROBLEM TO BE SOLVED: To ensure a resin intake manifold in an engine, which can ensure a sufficient strength without increasing the side of its structure. SOLUTION: A branch part 3 is firmly fastened to a cylindrical pipe 6 by using a fastening bolt 11 so as to prevent a curved part of the branch part 3 from being deformed. A spacer 15 having a stiffness which is higher than that of rubber or the like is interposed between the branch part 3 and the cylindrical pipe 6, and the outer periphery of the spacer 15 is sealed by means of a connecting member 19 made of rubber, and a fastener 10 for fastening the outside of the connecting member 9. Even though the branch part 3 is firmly fastened to the cylinder pipe 6 by the fastening bolt 11, an exhaust passage can be ensured by a clearance defined by the spacer 15, and by adjusting the fastening force of the fastener 10 so as to swell the connection part 9, air leaks below the pressure resistance strength of an intake manifold, thereby it is possible to prevent breakage of the intake manifold.
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