Valve seat structure of engine

Abstract

Abstract PURPOSE:To improve the gas exchange efficiency of a combustion chamber by bringing the inner circumference surface of a valve inserting part provided on the combustion chamber side from a seating part in a valve seat, close to a valve outer edge part through a small clearance. CONSTITUTION:The heating part 31 of a valve seat 30 is provided by being set back from a combustion chamber inner wall surface 5a. And an insert part 32 for insertion of a valve 11 is formed toward the combustion chamber side from the seating part 31. Further, the inner circumference surface 32a of the insert part 32 is formed so as to near the outer edge part 11c of the valve 11 through a small clearance 1. Thereby, when the valve outer edge part 11c is separated from the inner circumference surfaces 32a of the insert part 32, or titted thereto, a real valve lift is increased immediately, or reduced nearly zero respectively. Therefore, a valve lift changing rate becomes large so as to make the opened area of the valve large in relation to a time, so that the gas exchange efficiency of the combustion chamber is improved.

Inventors

• 👤 Kenji Kashiyama
• 👤 謙二 樫山
• 👤 Mitsuo Hitomi
• 👤 光夫 人見
• 👤 Kazuaki Umezono
• 👤 和明 梅園
• 👤 Toshio Nishikawa
• 👤 西川　俊雄
• 👤 Fumio Hitase
• 👤 日當瀬　文雄
• 👤 Nobuo Takeuchi
• 👤 暢男 竹内

Bibliographic Details