| 摘要 |
PURPOSE:To improve operation performance at low and high speeds and at acceleration, by providing an auxiliary throttle valve and a main throttle valve in an intake passage so that the auxiliary throttle valve is located upstream to the main throttle valve and by interlocking both the valves with each other through a linkage and using the intake pressure between both the valves to open and close the auxiliary throttle valve. CONSTITUTION:An auxiliary throttle valve 9 and a main throttle valve 3 are provided in an intake passage 2 so that the auxiliary throttle valve 9 is located upstream to the main throttle valve. A fuel injector comprising a Venturi part 10a and a fuel nozzle 10b is provided in a notch made at one end of the auxiliary throttle valve 9. The shafts of both the throttle valves 3, 9 are interlocked with each other through links 31a-31c. An auxiliary lever 41 secured on the auxiliary throttle valve shaft 40 is pushed to open the auxiliary throttle valve 9. The links 31 are set so that the angle of opening of the auxiliary throttle valve 9 is smaller than that of the main throttle valve 3. A diaphragm unit 38 is coupled to the auxiliary throttle valve shaft 40 through a lever 39 and a rod 33 so that the auxiliary throttle valve 9 is opened when the intake pressure between both the throttle valves 3, 9 has become lower than a prescribed level. |
