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    • 1. 发明授权
    • Variable venturi type carburetor
    • 可变文丘里型化油器
    • US4267128A
    • 1981-05-12
    • US83830
    • 1979-10-11
    • Tatuo KobayashiNobuo Yamada
    • Tatuo KobayashiNobuo Yamada
    • F02M7/17F02M9/06
    • F02M7/17
    • A variable venturi type carburetor is provided having a vacuum generated in the venturi portion in accordance with the throttle valve opening. The vacuum is transmitted into a suction chamber through a vacuum passage so as to balance the force which is the sum of the force exerted by a suction spring and the force exerted by the atmospheric pressure introduced from an atmospheric pressure chamber. The suction piston is set to provide a cross-sectional area of the venturi portion corresponding to the intake air flow rate. The suction piston is provided with a guide groove receiving a guide roller which is rotatably mounted on a guide pin provided on the carburetor casing to oppose to the guide groove. The guide roller is adapted to roll along the guide groove to smooth the movement of the suction piston and prevents the suction piston from being rotated. The combination of the guide roller and the guide groove is free from the problem of wear, even after a long use, so as to ensure an extremely small hysteresis of behaviour of the suction piston and hence a highly accurate adjustment of the air fuel ratio. A suction spring is fixed at its both ends to the suction piston and the suction chamber in a twisted condition so as to bias the suction piston in a circumferential or rotational direction.
    • 提供了可变文丘里型化油器,其具有根据节流阀开口在文氏管部分产生的真空。 真空通过真空通道传递到吸入室中,以平衡由吸入弹簧施加的力与由大气压力室引入的大气压力所施加的力之和的力。 吸入活塞被设置成提供对应于进气流量的文氏管部分的横截面面积。 抽吸活塞设置有导向槽,该引导槽接收导向辊,该引导辊可旋转地安装在设置在化油器外壳上的引导销上以与引导槽相对。 引导辊适于沿着引导槽滚动以平滑抽吸活塞的移动并防止抽吸活塞旋转。 导辊和引导槽的组合即使在长时间使用之后也没有磨损的问题,以确保吸入活塞的行为滞后非常小,因此空气燃料比的精确调节。 吸入弹簧的两端固定在抽吸活塞和吸入室处于扭转状态,以便沿周向或旋转方向偏压吸入活塞。