JPH0356861U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案の一実施例によるＥＧＲ機構付
内燃機関の要部断面図、第２図ａはその弁特性を
示すグラフ、第２図ｂは同じく排気圧力特性を示
すグラフ、第２図ｃは同じく出力特性を示すグラ
フ、第３図ａは従来の内燃機関の弁特性を示すグ
ラフ、第３図ｂは同じく排気圧力特性を示すグラ
フ、第３図ｃは同じく出力特性を示すグラフであ
る。 ３……シリンダ、１２……排気弁、１７……排
気カム、１７ａ……主カム面、１７ｂ……副カム
面、２６……吸気通路、２７……逆止弁。 Fig. 1 is a cross-sectional view of essential parts of an internal combustion engine with an EGR mechanism according to an embodiment of the present invention, Fig. 2a is a graph showing its valve characteristics, Fig. 2b is a graph similarly showing exhaust pressure characteristics, Fig. 2 Fig. 3 c is a graph showing the output characteristics, Fig. 3 a is a graph showing the valve characteristics of a conventional internal combustion engine, Fig. 3 b is a graph showing the exhaust pressure characteristics, and Fig. 3 c is a graph showing the output characteristics. be. 3... Cylinder, 12... Exhaust valve, 17... Exhaust cam, 17a... Main cam surface, 17b... Sub-cam surface, 26... Intake passage, 27... Check valve.

Claims (1)

【実用新案登録請求の範囲】 排気弁１２開閉用の排気カム１７に主カム面１
７ａと副カム面１７ｂを形成し、排気行程におい
て前記主カム面１７ａによつて排気弁１２を開弁
するとともに、吸気行程の終了直前に前記副カム
面１７ｂによつて排気弁１２を開弁して排気管内
の既燃ガスの一部をシリンダ３内に逆流させるＥ
ＧＲ機構付内燃機関において、 吸気行程において前記シリンダ３に導入された
新気が吸気通路２６へ逆流することを規制する逆
止弁２７を前記吸気通路２６内に配設したことを
特徴とするＥＧＲ機構付内燃機関。[Scope of Claim for Utility Model Registration] Main cam surface 1 on exhaust cam 17 for opening/closing exhaust valve 12
7a and a sub-cam surface 17b, the main cam surface 17a opens the exhaust valve 12 during the exhaust stroke, and the sub-cam surface 17b opens the exhaust valve 12 immediately before the end of the intake stroke. E to cause part of the burned gas in the exhaust pipe to flow back into the cylinder 3.
An internal combustion engine with a GR mechanism, characterized in that a check valve 27 is disposed in the intake passage 26 to restrict fresh air introduced into the cylinder 3 during the intake stroke from flowing back into the intake passage 26. Internal combustion engine with mechanism.