Abstract The carburetor has a fuel/air mixture supply circuit constituted by the sequence of an ascending channel connected to a float chamber through an immersed calibrated orifice and a descending channel with an opening into the intake pipe of the carburetor downstream of the main throttle member of this pipe. The descending channel is controlled by a member which opens it only during periods of deceleration of the engine. The linking zone between the two channels is above the constant level of the float chamber and connected through an air passage having a second calibrated orifice, to an air intake zone of the carburetor other than that connected to the upper portion of the float chamber. The ascending channel has a further calibrated orifice above the constant level and communicates with the space above the constant level through a passage of small cross-section opening into the ascending channel between its two calibrated orifices and also itself above the constant level. The assembly reduces the suction in the ascending channel to an extent insufficient or sufficient to stop the fuel being sucked into the descending channel according as the closure member is open or not.
Carburetor for internal combustion engines, which comprises a circuit for the supply of fuel mixed with air constituted by the sequence of an ascending channel which is connected to a constant level chamber through an immersed calibrated orifice and of a descending channel with an opening into the intake pipe of the carburetor downstream of the main throttle member of this pipe and which descending channel is controlled by an obturating member adapted to free it only during periods of deceleration of the engine, the linking zone between the two channels being situated above said constant level and connected, through an air passage provided with a second calibrated orifice, to an air intake zone of the carburetor different from that by which the upper portion of the float chamber is connected to this air intake zone through an equilibrating passage in order to be subjected to a pressure substantially equal to atmospheric pressure, characterized by the fact that the ascending channel comprises, in addition to the immersed calibrated orifice, a calibrated orifice situated above the constant level of the fuel in the reservoir and communicates with the portion of the reservoir situated above said constant level through a passage of small section opening into said ascending channel between its two calibrated orifices and itself situated also above the constant level, the assembly being such that said passage reduces the suction existing in the ascending channel to an extent insufficient or sufficient to prevent the fuel from being aspirated to the descending channel according as the obturating member of the latter is open or not respectively.
Claim 2
Dependent Claim
265 words
Carburetor for internal combustion engines, which comprises a circuit for the supply of fuel mixed with air constituted by the sequence of an ascending channel which is connected to a constant level chamber through an immersed calibrated orifice and of a descending channel with an opening into the intake pipe of the carburetor downstream of the main throttle member of this pipe and which descending channel is controlled by an obturating member adapted to free it only during periods of deceleration of the engine, the linking zone between the two channels being situated above said constant level and connected, through an air passage provided with a second calibrated orifice, to an air intake zone of the carburetor different from that by which the upper portion of the float chamber is connected to this air intake zone through an equilibrating passage in order to be subjected to a pressure substantially equal to atmospheric pressure, characterized by the fact that the ascending channel comprises, in addition to the immersed calibrated orifice, a calibrated orifice situated above the constant level of the fuel in the reservoir and communicates with the portion of the reservoir situated above said constant level through a passage of small section opening into said ascending channel between its two calibrated orifices and itself situated also above the constant level, the assembly being such that said passage reduces the suction existing in the ascending channel to an extent insufficient or sufficient to prevent the fuel from being aspirated to the descending channel according as the obturating member of the latter is open or not respectively.