CYLINDER HEAD STRUCTURE

To efficiently cool an EGR gas which passes an EGR passage in a cylinder head when forming the EGR passage at the cylinder head.SOLUTION: A cylinder head structure comprises an in-head EGR passage 70 which is formed in a cylinder head main body 13, a water jacket 20 in which a cooling water derivati...

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Bibliographische Detailangaben
Hauptverfasser:	IMURA ARASHI, TOMINAGA TAKAYUKI, KARIYA TAKASHI, MURAKAMI TAKEHIRO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES BLASTING COMBUSTION ENGINES COOLING OF INTERNAL-COMBUSTION ENGINES COOLING OF MACHINES OR ENGINES IN GENERAL CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES ENGINE PLANTS IN GENERAL HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF WEAPONS
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Beschreibung
Zusammenfassung:	To efficiently cool an EGR gas which passes an EGR passage in a cylinder head when forming the EGR passage at the cylinder head.SOLUTION: A cylinder head structure comprises an in-head EGR passage 70 which is formed in a cylinder head main body 13, a water jacket 20 in which a cooling water derivation part 21 is arranged at an end part in a cylinder row direction, and a water outlet 30 connected to an outlet-side wall part being a wall part at which the cooling water derivation part 21 of the cylinder head main body 13 is arranged. A recess which is formed so as to adjoin the cooling water derivation part 21 via a bulkhead part is formed at the outlet-side wall part, the water outlet 30 has a guide part for introducing a part of cooling water from the water jacket 20 to the recess, and the in-head EGR passage 70 is formed so as to be located at the lower part of the cooling water derivation part 21 and the recess.SELECTED DRAWING: Figure 7 【課題】シリンダヘッドにＥＧＲ通路を形成する場合に、シリンダヘッド内のＥＧＲ通路を通るＥＧＲガスを効率良く冷却する。【解決手段】シリンダヘッド本体１３内に形成されたヘッド内ＥＧＲ通路７０と、気筒列方向の端部に冷却水導出部２１が設けられたウォータジャケット２０と、シリンダヘッド本体１３における冷却水導出部２１が設けられた壁部である出口側壁部に接続されるウォータアウトレット３０と、を備え、出口側壁部には、冷却水導出部２１に対して、隔壁部を介して相隣接するように設けられた凹部が形成され、ウォータアウトレット３０は、冷却水の一部をウォータジャケット２０から凹部に導く案内部を有し、ヘッド内ＥＧＲ通路７０は、冷却水導出部２１及び凹部の下部に位置するように形成されている。【選択図】図７