AIR INTAKE AND EXHAUST DEVICE OF ENGINE

摘要

PROBLEM TO BE SOLVED: To increase the output of an engine by increasing the filling efficiency of fresh intake air. SOLUTION: An air intake port 14 guiding the fresh intake air to a combustion chamber 12 and an exhaust gas port 15 exhausting a burned exhaust gas to the outside are formed in a cylinder head 10 fitted to a cylinder 11 reciprocatingly storing a piston. The air intake port 14 is opened and closed by an intake valve 16, and the exhaust gas port 15 is opened and closed by an exhaust valve 17. The opening parts 14a and 15a of the intake port 14 and the exhaust gas port 15 on the combustion chamber 12 side are formed nearer the center part of the combustion chamber 12. The tilt angleθi of the center shaft I of the intake valve 16 relative to a core center axis O is set larger than the tilt angleθe of the center axis E of the exhaust gas valve 17. A bulge part is formed on the inner surface of the intake port 14 opposed to a valve guide 18 movably guiding the intake valve 16. COPYRIGHT: (C)2005,JPO&NCIPI