Internal combustion engine fuel injector
AssigneeC.R.F. Societa Consortile per Azioni
InventorMario Ricco
Life of this patent
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Abstract
A fuel injector has a fuel inlet, and a metering valve which is activated by an electromagnetic actuator to open and close an injection nozzle; the metering valve has a control chamber communicating with the inlet and defined by an end wall, in which is formed an outlet hole closed by a shutter moved along an axis by the actuator; the end wall and the shutter are defined by respective parallel, facing surfaces which rest against each other to compress the film of fuel issuing from the hole during closure by the shutter, and which have channeling formed about the hole to generate, in use, a counterpressure for the outflowing fuel.
Claims19
1) A fuel injector (1) for an internal combustion engine;
- the injector comprising a fuel inlet (5);
- actuating means (8);
- and a metering valve (15) activated by said actuating means (8) to open and close an injection nozzle, and comprising a control chamber (16) communicating with said inlet (5) and defined by an end wall (20) having a hole (22) permitting fuel outflow from said control chamber (16), a shutter (28) activated by the actuating means (8) to move along a longitudinal axis (3) with respect to said end wall (20), and mating means (32) for mating said shutter (28) and said end wall (20) to close said hole (22) in fluidtight manner;
- said mating means (32) comprising a first (33) and a second (26) surface carried by said shutter (33) and said end wall (20) respectively, and which extend about said hole (22) facing and parallel to each other, and mate by resting one on the other;
- characterized in that said mating means (32) also comprise channeling means (35) formed about said hole (22) in at least one (26) of said first and second surfaces.
Dependencies are inferred from the claim text.