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    • 2. 发明授权
    • Variable venturi carburetor
    • 可变文丘里化油器
    • US4489014A
    • 1984-12-18
    • US540627
    • 1983-10-11
    • Tadashi NagaiEiichi OhnishiGiichi ShioyamaYutaka Matayoshi
    • Tadashi NagaiEiichi OhnishiGiichi ShioyamaYutaka Matayoshi
    • F02M7/17F02M9/06
    • F02M7/17
    • In a prior-art variable venturi carburetor in which the cross-sectional area of venturi is automatically varied according to the amount of intake air to keep the flow rate of intake air or the vacuum generated at the venturi at a constant level, since the cross section of venturi changes rectangularly, fuel is concentratedly jetted only near the middle portion of the venturi, so that fuel is not uniformly mixed with air passing through the venturi. To overcome these drawbacks, a wall having a reverse trapezoidal recess is provided near the nozzle and further a pair of triangular slots or cutouts are formed near the lower end surface of the suction piston obliquely and symmetrically so as to slidably engage with the wall, with the result that the cross section of the venturi changes trapezoidally and therefore a stable mixture is obtained even when the engine is running at a low speed or being idled.
    • 在现有技术的可变文丘里化油器中,文丘里管的横截面积根据进气量而自动变化,以将进气的流量或文丘里管上产生的真空保持在恒定水平,因为十字 文氏管的一部分长方形变化,燃料集中喷射在文丘里管的中部附近,使得燃料与通过文丘里管的空气不均匀混合。 为了克服这些缺点,在喷嘴附近设置具有倒梯形凹部的壁,并且在抽吸活塞的下端面附近形成一对三角形槽或切口,倾斜和对称地形成为与壁壁可滑动地接合, 即使在发动机以低速行驶或空转的情况下,文丘里管的横截面也能够梯形变化,因此得到稳定的混合物。
    • 3. 发明授权
    • Fuel supply system
    • 燃油供应系统
    • US4699110A
    • 1987-10-13
    • US854411
    • 1986-04-21
    • Hiroshi IwanoTadahiro YamamotoTadaki OtaHiroshi OganeEiichi OhnishiAtsushi Yonezawa
    • Hiroshi IwanoTadahiro YamamotoTadaki OtaHiroshi OganeEiichi OhnishiAtsushi Yonezawa
    • F02M11/02F02M13/04F02M69/04F02M69/08F02M51/00
    • F02M69/08F02M11/02F02M13/046F02M69/041
    • A primary passage and a secondary passage in a parallel relation to each other are disposed between an air cleaner and a branch passage collecting portion of an intake manifold. The primary passage is smaller in diameter than the secondary passage and has at the downstream end thereof a laval nozzle through which air flows at the speed of sound even under low-speed low-load engine operating conditions. The laval nozzle is connected to a carburetion chamber which is elongated straightly in the direction downstream of the laval nozzle. A fuel injection valve is disposed in the primary passage at a place upstream of the laval nozzle. A pressure control valve is adapted so that a vacuum higher than a predetermined value is developed in the carburetion chamber at any time. A primary throttle valve and a secondary throttle valve are interconnected so that the secondary throttle valve is held closed unless the primary throttle valve is fully open. The primary throttle valve is movable in response to an engine operating condition.
    • 在空气滤清器和进气歧管的分支通道收集部分之间设置有彼此平行关系的主通道和次通道。 主通道的直径比二次通道的直径小,并且在其下游端有一个拉链喷嘴,即使在低速低负载发动机运行条件下,空气以声速流过。 喷泉喷嘴连接到在油槽喷嘴的下游方向上直线延伸的化油室。 燃料喷射阀设置在主通道中,在喷嘴喷嘴的上游位置。 压力控制阀适于在任何时候在化油室中产生高于预定值的真空。 主节流阀和辅助节流阀相互连接,使得次级节流阀保持关闭,除非主节流阀完全打开。 主节流阀可响应于发动机工作状态而运动。