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    • 10. 发明专利
    • INTAKE DEVICE FOR INTERNAL COMBUSTION ENGINE
    • JPS57102518A
    • 1982-06-25
    • JP17708880
    • 1980-12-17
    • TOYOTA MOTOR CO LTD
    • NOHIRA HIDETAKAMATSUI HIDEAKIFURUYA MASAYUKI
    • F02B31/00F02D9/02F02M35/10
    • PURPOSE:To sufficiently heighten the velocity of combustion in the operation of an engine under low and medium load, by providing shutoff valves in an accessory intake passage branched from the upstream side of the throttle valve of a carburetor, so that the shutoff valves act in response to the negative pressure in a main intake passage. CONSTITUTION:A second throttle valve 14 is provided in each main intake passage 10 downstream to the throttle valve 12 of a carburetor. An accessory intake passage 37 is branched from the upstream side of the throttle valve 12 and connected to a common communication passage 34. Shutoff valves 38, 39, which act in response to the negative pressure between the throttle valves 12, 14, are provided. In the operation of an engine under low load, a mixture is ejected from the common communication passage 34 due to the pressure difference between intake ports 5 so that intense turbulence is caused in a combustion chamber 4. In the operation of the engine under medium load, the shutoff valve 39 is fully opened to eject a mixture from the accessory intake passage 37 toward the intake port 5 to cause intense turbulence in the combustion chamber 4. According to this constitution, the velocity of combustion is heightened.