| 摘要 |
<p>A carburetor comprises a main body portion (12) defining a venturi (2) having an air intake side and an engine outlet side, a throttle shutter (10) mounted within the venturi (2) between the air intake side and the engine outlet side, a fuel chamber (14) for supplying fuel into the venturi (2) via a main discharge port (27) and at least one idle discharge port (11), the main discharge port (27) opening into the venturi (2) on the air intake side of the throttle shutter (10), a choke feed passage (31) extending from the fuel chamber (14) to the venturi (2), the choke feed passage (31) opening into the venturi (2) on the opposite side of the throttle shutter (10) to the main discharge port (27), and means (32, 34) for selectively opening and closing the choke feed passage (31). The fuel chamber (14) comprises a metering diaphragm (17) and the choke feed passage (31) supplies pure fuel to the venturi (2), the carburetor being responsive to a lower pressure in the venturi (2) on the engine outlet side of the throttle shutter (10) than on the air intake side, when the throttle shutter (10) is in a partially opened position and the choke feed passage (31) is open, to cause fuel to be drawn from the fuel chamber (14) primarily through the choke feed passage (31) into the venturi (2) on the engine outlet side of the throttle shutter (10).</p> |
