Fuel injector with vop loss resistant valve spring for...

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

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F02M 63/00 (2006.01)

Patent

CA 2581470

A fuel injector assembly for an emissions-based EMD 710 locomotive diesel engine. The fuel injector assembly includes a needle slidably positioned within a bore of a valve body of the injector assembly, where fuel pressure introduced into a bore chamber causes the needle to open a spray tip. A spring mounted within the bore forces the needle to close the spray tip when the fuel is not being applied. The spring is a dead coil spring including inactive coils where at least portions of the coils at both ends of the spring are in intimate contact with each other so as to reduce spring wear during operation of the assembly. Because the dead coil spring has reduced wear, the VOP set point of the fuel injector assembly can be reduced, which reduces NOx emissions.

Ensemble injecteur de carburant pour moteur diesel de locomotive EMD à base d'émissions (710), comprenant une aiguille placée de manière à coulisser dans un alésage ménagé dans un corps de valve de l'ensemble injecteur, la pression du carburant introduite dans une chambre d'alésage provoquant l'ouverture d'une buse d'injecteur au moyen de l'aiguille. Un ressort, monté dans l'alésage, sollicite l'aiguille qui referme la buse d'injecteur lorsque le carburant n'est pas appliqué. Le ressort est du type à enroulement mort comprenant des enroulements inactifs dont au moins des parties sur les deux extrémités du ressort sont en contact intimes de manière à réduire l'usure du ressort pendant le fonctionnement de l'ensemble. En raison de cette usure réduite, le point de réglage VOP de l'ensemble injecteur de carburant peut être réduit, ce qui se traduit par une réduction d'émissions NOx.

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