EGR DEVICE FOR INTERNAL COMBUSTION ENGINE

• Main Author: MITO YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 10.12.2020
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; COMBUSTION ENGINES; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

To prevent the residence of condensed water while achieving the compact figure of an internal combustion engine by forming an EGR internal passage in a cylinder head.SOLUTION: An EGR internal passage 20 consists of a laterally long first part 21 formed on a lower part of a cylinder head, a vertically long second part 22 rising from a terminal end of the first part 21, and a downwardly inclining third part 23 communicated with an upper part of the second part 22. In a rear face 12 of the cylinder head, a mounting hole 35 communicated with the second part 22 is bored, and an EGR valve 29 is mounted in the mounting hole 35. A starting end of the first part 21 is opened to an exhaust side face of the cylinder head. Even when condensed water is generated in any site of the EGR internal passage 20, the condensed water flows down from the starting end of the first part 21 to an exhaust system or flows down from a terminal end of the third part 23 to a surge tank or the like. So, there is no possibility that the condensed water resides in the EGR internal passage 20 to corrode the cylinder head.SELECTED DRAWING: Figure 6 【課題】シリンダヘッドにＥＧＲ内部通路を形成して内燃機関のコンパクト化を図りつつ、凝縮水が溜まることを防止する。【解決手段】ＥＧＲ内部通路２０は、シリンダヘッドの下部に形成された左右長手の第１部分２１と、第１部分２１の終端から立ち上がった上下長手の第２部分２２と、第２部分２２の上部に連通した下向き傾斜の第３部分２３とで構成されている。シリンダヘッドの後面１２には、第２部分２２と連通した取り付け穴３５が空いており、取り付け穴３５にＥＧＲバルブ２９が取り付けられている。第１部分２１の始端はシリンダヘッドの排気側面に開口している。ＥＧＲ内部通路２０のどの部位に凝縮水が発生しても、凝縮水は、第１部分２１の始端から排気系に流下するか、第３部分２３の終端からサージタンク等に流下するため、凝縮水がＥＧＲ内部通路２０に溜まってシリンダヘッドを腐食させるようなことはない。【選択図】図６