A hydraulically driven springless fuel injector

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

Patent

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Details

F02M 47/00 (2006.01) F02M 47/02 (2006.01) F02M 47/04 (2006.01) F02M 57/02 (2006.01) F02M 59/10 (2006.01) F02M 59/46 (2006.01)

Patent

CA 2331163

A fuel injector which has a check valve (72) that is hydraulically controlled by a control fluid. A volume of fuel is pressurized within a fuel chamber (88) of the injector by an intensifier (86). The check valve (72) controls the flow of fuel from the fuel chamber through at least one nozzle opening (54) of a valve body. The flow of control fluid is controlled by a control valve (108) which can move between a first position and a second position. When the control valve is at its first position, the control fluid creates an hydraulic force which moves the check valve (72) to a closed position. When the control valve (108) is at its second position, the control fluid moves the check valve (72) to an open position to allow the pressurized fuel to be ejected or sprayed from the nozzle opening(s). The intensifier (86) can also be hydraulically controlled by a control valve (114).

L'invention concerne un injecteur de carburant qui comporte un clapet anti-retour (72) commandé hydrauliquement par un fluide de commande. Un volume de carburant est mis sous pression par un multiplicateur de pression (86) à l'intérieur d'une chambre à carburant (88) de l'injecteur. Le clapet anti-retour (72) commande l'écoulement du carburant depuis la chambre à carburant et son passage à travers au moins un orifice (54) de l'ajutage du corps de clapet. L'écoulement du fluide de commande est régulé par une soupape de contrôle (108) qui peut passer d'une première position à une seconde position et inversement. Quand la soupape de contrôle est dans sa première position, le fluide de commande génère une force hydraulique qui déplace le clapet anti-retour (72) de façon à l'amener en position fermée. Quand elle est dans sa seconde position, le fluide déplace le clapet anti-retour (72) de façon à l'amener en position ouverte et à permettre l'éjection ou la vaporisation du carburant sous pression par le ou les orifices de l'ajutage. Le multiplicateur de pression (86) peut aussi être commandé hydrauliquement par une soupape de contrôle (114).

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