Unit injector optimized for reduced exhaust emissions

Details Unit injector optimized for reduced exhaust emissions Unit injector optimized for reduced exhaust emissions

F - Mech Eng,Light,Heat,Weapons

02

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F02M 61/04 (2006.01) F02M 57/02 (2006.01) F02M 59/46 (2006.01) F02M 61/10 (2006.01) F02M 61/18 (2006.01) F02M 65/00 (2006.01)

Patent

CA 2200488

A diesel unit injector of the EMD type is provided with a tip (30a) whose radius (R4) is centered below the center of radius (R5) of the sac which it encloses, and the sac volume is minimized. Th e lower face (31a, 33a) of the nozzle body (10a) of the injector is faired in such a manner as to maintain a strong wall cross section. A system utilizing a set of potential substitute spring seats (S) is used to reset the opening pressure, as upon rebuilding, within narrow tolerances. The nozzle body (10a) is shortened and the check valve cage (6a) correspondingly lengthened to reduce the length of the injector valve proper. Trapped volume is reduced consistently with fuel flow requirements.

L'invention porte sur un injecteur diesel unitaire du type EMD dont l'extrémité (30a) présente un rayon (R4) centré sous le centre du rayon (R5) de la chambre qu'il enferme, et dont le volume se trouve ainsi réduit. La face inférieure (31a, 33a) du corps (10a) de la buse de l'injecteur est carénée de manière que la section de la paroi reste importante. L'invention porte également sur un système utilisant un ensemble de sièges (S) de ressorts de remplacement potentiels, qui permet de rétablir la pression d'ouverture en deçà de tolérances étroites, lors de leur remise en état. Le corps (10a) de la buse est raccourci et la cage (6a) de la soupape de retenue allongée proportionnellement, ce qui réduit la longueur de la soupape d'injection proprement dite. Le volume emprisonné se trouve réduit en accord avec les impératifs de circulation du carburant.

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