Carburettors

F - Mech Eng,Light,Heat,Weapons – 02 – M

Patent

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Details

F02M 19/04 (2006.01) F02D 11/04 (2006.01) F02M 3/10 (2006.01) F02M 7/24 (2006.01)

Patent

CA 2687998

A carburettor includes a primary air passage (19), an adjustable throttle valve (8) situated within the primary air passage, a fuel supply nozzle (28) communicating with the primary air passage and connected to a fuel metering valve for varying the amount of fuel discharged through the nozzle. The fuel metering valve comprises an elongate sleeve (32) movably accommodating an elongate valve member (33). The sleeve and valve member define a fuel inlet space (35). A fuel inlet (37) communicates with the fuel inlet space. A fuel outlet (39) passes through the wall of the sleeve (32) and communicates with the fuel supply nozzle (28). A portion of the outer surface of the valve member (33) is so profiled that the valve member (33) is movable relative to the sleeve (32) such that the area of communication between the fuel inlet space (35) and the outlet (39) varies progressively between a maximum and a minimum value.

La présente invention concerne un carburateur comportant un passage d'air primaire (19), une soupape d'étranglement (8) réglable située à l'intérieur du passage d'air primaire, une buse d'amenée de carburant (28) communiquant avec le passage d'air primaire et raccordée à un doseur de carburant destiné à modifier la quantité de carburant évacué à travers la buse. Le doseur de carburant comprend un manchon allongé (32) logeant de manière mobile un élément de doseur allongé (33). Le manchon et l'élément de doseur définissent un espace d'admission de carburant (35). Une entrée de carburant (37) communique avec l'espace d'admission de carburant. Une sortie de carburant (39) passe à travers la paroi du manchon (32) et communique avec la buse d'amenée de carburant (28). Une partie de la surface externe de l'élément de soupape (33) est profilée de sorte que l'élément de soupape (33) est mobile par rapport au manchon (32) de telle sorte que la zone de communication entre l'espace d'admission de carburant (35) et la sortie (39) varie progressivement entre une valeur maximale et une valeur minimale.

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