INTAKE PORT STRUCTURE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an intake port structure for an internal combustion engine improving intake efficiency of intake air to a combustion chamber by improving passage structure of the intake port. SOLUTION: In the internal combustion engine in which an intake valve 10 opens and closes a combustion chamber opening 6 with slidably supported at a valve stem 10a thereof by a valve guide 11 fixed on an outer curved wall in a middle of an intake port 7 bored from a side of a cylinder head, curved and reaching the combustion chamber opening 6, passage section area of a downstream part 7L of the intake port 7 reduces as it goes back to an upstream side from the combustion chamber opening 6. The passage section area of a position P10going back to the upstream side from the combustion chamber opening by about 10% of whole length of the suction port 7 is 0.8 times of area of the combustion chamber opening or less. COPYRIGHT: (C)2006,JPO&NCIPI