| 摘要 |
PURPOSE:To prevent the opening of an auxiliary throttle valve from being changed due to vibration by a structure wherein a throttle valve and the auxiliary throttle valve are coupled with each other by means of a link mechanism. CONSTITUTION:A partially protruded part, in which a fuel injection part 11 forming a small venturi 12 is provided, is provided in a suction air passage 2 at a location between a venturi part 4 and a throttle valve 3. An auxiliary throttle valve 10 is provided in the suction air passage 2 at a location near the fuel injection part 11 and formed in the sectional form of the suction air passage 2 with the part of the fuel injection part 11 is removed so as to clog the greater part of the suction air passage 2 during the running with small suction air quantity, resulting in passing the suction air through the small venturi part 12 and consequently accomplishing the atomization of fuel. Furthermore, an auxiliary throttle valve shaft 9 and a throttle valve shaft 8 are coupled with each other by means of a link mechanism 15, resulting in rendering not to change the opening of the auxiliary throttle valve due to vibration. |
