| 摘要 |
PURPOSE:To maintain the flow inertia of intake air in an intake passage and increase the charging efficiency of the intake air to improve the engine output by providing a fuel mixture passage having an enlarged enclosed chamber on the downstream side of a throttle valve in the intake passage. CONSTITUTION:An intake passage 6 is communicated through a spacer 10 to a throttle valve 11 and a carburetor 12. The spacer 10 is formed with a hole 14, and a pipe 13 is fitted with the hole 14. The pipe 13 is connected with a pipe 16 having an enlarged enclosed chamber 15 at one end. The pipes 13 and 16 form a fuel mixture passage 18. An end opening 17 of the fuel mixture passage 18 is located at a position deflected from the center of an intake valve 8 in the vicinity of the intake valve 8. With this arrangement, the volume in the intake passage 6 downstream of the throttle valve 11 is increased, and a fuel mixture continues to be supplied through the throttle valve 11 to the downstream side thereof even after closing of the intake valve 8. Thus, the flow inertia of intake air in the intake passage 6 is maintained until the intake valve 8 is opened again. |
