MANUFACTURING METHOD OF ENGINE CYLINDER HEAD AND ENGINE CYLINDER HEAD MANUFACTURED BY THE SAME

• Main Authors: WADA YOSHITAKA, MATSUMAE HIROKAZU, NAKAHARA KOJI, KAJIYAMA YOSHINORI, IKEDA YUICHIRO, NABETANI YUKI, SUZUKI YOHEI, KISHIDA TAKAO
• Format: Patent
• Language: English; Japanese
• Published: 13.10.2016
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; BORING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; TURNING; WEAPONS

PROBLEM TO BE SOLVED: To increase a tumble flow of intake air, flowing into a combustion chamber through an air-intake port of a molten cylinder head, as much as possible.SOLUTION: A combustion chamber opposing wall surface, positioned opposite to a combustion chamber with respect to a central axis of a cylinder at a throat section 25 of an air-intake port 12 when the number of the air-intake port 12 mounted on each cylinder is one or of one or both of the two air-intake ports 12 when the two air-intake ports 12 are mounted on each cylinder, is manufactured with a first tool 92 inserted through an opening section of the air-intake port 12 of a cylinder head to the combustion chamber along a central axis line L1 of an air-intake valve 14 which opens and closes the opening section. A combustion chamber side wall surface, positioned at a side of the combustion chamber at the throat section 25 of the air-intake port 12 in the central axis direction of the cylinder, is manufactured with a second tool 93 inserted through the opening section along the central axis line L1 of the air-intake valve 14.SELECTED DRAWING: Figure 8 【課題】鋳造により成形されたシリンダヘッドの吸気ポートから燃焼室に流入する吸気のタンブル流を出来る限り強くする。【解決手段】気筒毎の吸気ポート１２の数が１つである場合の該１つの吸気ポート、又は２つである場合のいずれか１つの吸気ポート１２若しくは両方の吸気ポート１２のスロート部２５における、気筒の中心軸方向の反燃焼室側に位置する反燃焼室側壁面を、シリンダヘッドにおける該吸気ポート１２の燃焼室への開口部から、該開口部を開閉する吸気弁１４の中心軸線Ｌ１に沿って挿入した第１工具９２により加工するとともに、該加工する吸気ポート１２のスロート部２５における、気筒の中心軸方向の燃焼室側に位置する燃焼室側壁面を、上記開口部から上記吸気弁１４の中心軸線Ｌ１に沿って挿入した第２工具９３により加工する。【選択図】図８