| 摘要 |
PURPOSE:To improve starting performance with simple construction by providing a matter having fine holes and whose ventilation is eliminated when fuel is adsorbed on an excessive fuel discharge passage communicating a fuel chamber of a diaphragm type carburetor and atmosphere. CONSTITUTION:A tickler 20 is provided on the back face of a diaphragm 10 of a diaphragm type carburetor and a porous fuel adsorbing matter 23 is provided on a chamber 22 on the way of a fuel discharge passage 21 communicating a fuel chamber 9 and atmosphere. In starting of an engine, when the tickler 20 is pressed, the diaphragm 10 releases a fuel valve 8 through a lever 13 to make fuel flow from a tank into the fuel chamber 9. Pressing of the tickler 20 is stopped by excessive fuel when it is discharged from the fuel discharge passage 21. During operation of the engine, ventilation ability is eliminated by adsorbed fuel in the porous matter 23 and air is not flowed into the fuel chamber 9. Even if fuel in the porous matter 23 is evaporated, fuel in the fuel chamber 9 enters into the porous matter 23 during working of a working machine, then air is not entered. |
