| 摘要 |
PURPOSE:To improve charging efficiency by providing an auxiliary intake port which is closed to the open air and communicates with other cylinders besides and intake port for supplying intake air in each combustion chamber, and establishing the opening time of the auxiliary intake port to be earlier than that of the intake port for supplying the intake air. CONSTITUTION:The combustion chamber of each cylinder 2 has an intake port 6 which communicates with an air cleaner 14 and makes air intaking action, and is provided with an auxiliary intake port 9 which communicates mutually with other cylinders through a communicating passage 22 closed to the open air and an intake air diffusing chamber 21 besides said intake port 6 in each combustion chamber. The opening time of said port 9 is established to be earlier than that of said port 6. Thus pressure vibration generated in the communicating passage 22 can produce dynamic effect in said port 6 through the combustion chamber to improve charging efficiency through synergetic action with the dynamic effect in an intake system. |
