EXHAUST GAS RECIRCULATION DEVICE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide an exhaust gas recirculation device for an internal combustion engine that can reduce unburned gas flowing into a cooler and pressure loss at a merging portion of an exhaust gas recirculation passage.SOLUTION: An EGR device 10 includes: an EGR passage 11 for connecting two exhaust manifolds with an intake manifold: and an EGR cooler 12 disposed in the EGR passage 11 to cool EGR gas flowing in the EGR passage 11. The EGR passage 11 includes: an individual passage 13A connected to one exhaust manifold; an individual passage 13B connected to the other exhaust manifold; and a merging passage 14 for connecting a connection portion M between the individual passage 13A and the individual passage 13B with the EGR cooler 12. The individual passage 13B includes: a main passage section 17; and a narrowed passage section 18 having a diameter smaller than that of the main passage section 17. At the connection portion M between the individual passage 13A and the individual passage 13B, an angle α between the individual passage 13A and the individual passage 13B is 90 degrees or less.SELECTED DRAWING: Figure 2 【課題】クーラに流れ込む未燃ガスを低減すると共に、排気再循環通路の合流部の圧力損失を低減することができる内燃機関の排気再循環装置を提供する。【解決手段】ＥＧＲ装置１０は、２つの排気マニホールドと吸気マニホールドとを接続するＥＧＲ通路１１と、ＥＧＲ通路１１に配設され、ＥＧＲ通路１１を流れるＥＧＲガスを冷却するＥＧＲクーラ１２とを備え、ＥＧＲ通路１１は、一方の排気マニホールドと接続される個別通路１３Ａと、他方の排気マニホールドと接続される個別通路１３Ｂと、個別通路１３Ａと個別通路１３Ｂとの接続部ＭとＥＧＲクーラ１２とを接続する合流通路１４とを有し、個別通路１３Ｂは、主通路部１７と、主通路部１７よりも径が小さい絞り通路部１８とを有し、個別通路１３Ａと個別通路１３Ｂとの接続部Ｍにおいて個別通路１３Ａと個別通路１３Ｂとのなす角度αが９０度以下である。【選択図】図２