| 摘要 |
PURPOSE:To prevent the infiltration of foreign matters by forming an opening of a pressure release port formed in an intake manifold at the upstream side of the openings of an exhaust gas reflux port provided in the intake manifold and a blow-by gas purging port with a stage between these openings. CONSTITUTION:An intake manifold 20 is formed with an exhaust gas reflux port 6, a flow-by gas purging port 7, distribution sections 8 and an opening 10. Such manifold 20 is formed with an opening 21a of a pressure release port 21 at the upstream side of an opening 6a of said port 6 and an opening 7a of said port 7. Also, this opening 21a is spaced by a stage 22 from the wall surface 20a of intake manifold 20 formed with the openings 6a, 7a to be disposed located more inside than the opening 6a, 7a. Thus, foreign matters such as water content, carbon or oil in exhaust gas and blow-by gas are effectively prevented from infiltrating into the pressure release port 21. |
