| 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 an intake port for supplying intake air in each combustion chamber, and establishing the closing time of the auxiliary intake port to be later 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 intake, 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 port 6. The closing time of said port 9 is established to be later than that of said port 6, and the communicating passage 22 is provided with a shutter valve 23 opening at the high speed running of an engine. High pressure wave generated during the closing time of said port 6 is therefore transmitted to said port 9 and then into the communicating passage 22 communication with said port 9, and thus produces an effect on the opening time of said port 6 after several periods to improve charging efficiency. |
