| 摘要 |
PURPOSE:To prevent the main fuel from being fed too late by providing an auxiliary fuel passage with its inlet directly opened to a constant oil level chamber and with its outlet opened to the portion between a venturi and throttle valve of a suction path in a carburetor with a main channel and low speed channel in a common form. CONSTITUTION:During the fuel feed, when the aperture of a throttle valve 3 is something like idling, the low speed fuel is sucked into a suction path 1 through the slow port 12 and idle port 13 of a low speed channel 6. When the aperture of the throttle valve 3 is increased and the outlet 19b of the auxiliary fuel passage 19 is located downstream the throttle valve 3, the fuel is fed from the inlet 19a opened to the constant oil level chamber 4 at a suction quantity corresponding to the suction negative pressure and the aperture area of the outlet 19b downstream the throttle valve 3. When the aperture of the throttle valve 3 is further increased and the venturi negative pressure is larger than the suction negative pressure, the fuel is gradually sucked into the suction path 1 through a main nozzle 8, and the negative pressure downstream the throttle valve 3 is made comparatively low, thereby the suction quantity from the outlet 19b is decreased. |
