INTERNAL COMBUSTION ENGINE RECIRCULATED EXHAUST GAS INTRODUCTION DEVICE

PROBLEM TO BE SOLVED: To provide an internal combustion engine recirculated exhaust gas introduction device capable of saving manufacturing cost, preventing an output reduction at a time of full load operation, and yet ensuring stable combustion even if a large quantity of recirculated exhaust gas is introduced.SOLUTION: An internal combustion engine recirculated exhaust gas introduction device comprises: an intake passage 20 to which intake air is supplied; a combustion chamber 14 including intake-side opening portions 23a and 23b communicating with the intake passage 20; and an EGR gas supply passage 40 connecting the intake passage 20 to an exhaust passage 30, and recirculating exhaust gas from the exhaust passage 30 to the intake passage 20 as EGR gas, the EGR gas supply passage 40 including EGR gas introduction pipes 41 and 42 provided along a wall surface 22c of the intake passage 20 and introducing the EGR gas toward the intake-side opening portions 23a and 23b, respectively, a flow passage cross-sectional area of each of the EGR gas introduction pipes 41 and 42 being set smaller than a flow passage cross-sectional area of the EGR gas supply passage 40, and a central axis of each of the EGR gas introduction pipes 41 and 42 being oriented toward a central axis of the combustion chamber 14.SELECTED DRAWING: Figure 3 【課題】製造コストを削減することができると共に、全負荷運転時の出力低下を防止するだけでなく、排気還流ガスを多量に導入しても、燃焼を安定して行うことができる内燃機関の排気還流ガス導入装置を提供する。【解決手段】吸入空気が供給される吸気通路２０と、吸気通路２０に連通する吸気側開口部２３ａ，２３ｂを有する燃焼室１４と、吸気通路２０と排気通路３０との間を接続し、排気ガスをＥＧＲガスとして排気通路３０から吸気通路２０に還流させるＥＧＲガス供給通路４０とを備え、ＥＧＲガス供給通路４０は、吸気通路２０の壁面２２ｃに沿って設けられ、ＥＧＲガスを吸気側開口部２３ａ，２３ｂに向けて導入するＥＧＲガス導入管４１，４２を有し、ＥＧＲガス導入管４１，４２の各流路断面積を、ＥＧＲガス供給通路４０の流路断面積よりも小さく設定し、ＥＧＲガス導入管４１，４２の各中心軸を、燃焼室１４の中心軸側に指向させる。【選択図】図３