| 摘要 |
PURPOSE:To improve the idling stability of engine thus to improve the fuel consumption by arranging a throttle valve to be operated through an accelerator operating chip in the intake path trunk where a high speed intake path and a longer low speed intake path are connected in parallel at the upstream end. CONSTITUTION:An intake path trunk 7 is connected to the intake port 3 of an internal-combustion engine E while high speed intake path 8 and longer low speed intake path 9 are connected in parallel to the upstream end and the inlets of both intake paths 8, 9 are opened to common intake chamber 10. A gate valve 13 to be operated through an operating machine 15 is provided in the high speed intake path 8. While a throttle valve 12 to be operated through an accelerator operating chip 14 is provided in the intake path trunk 7. The intake path volume in the interval between an intake valve 5 and the throttle valve 12 can be set low without influenced by said paths 8, 9 through selection of the installing position of the throttle valve 12. Consequently, the idling of engine E can be stabilized. |
