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AssigneeC.R.F. Societa Consortile per Azioni
InventorsMario Ricco, Raffaele Ricco, Antonio Gravina, Marcello Gargano, Sergio Stucchi, Onofrio De Michele
Estimating the term…
The injector comprises a balanced metering servovalve to control a rod for the opening/closing of a nozzle. La servovalve has a valve body with a control chamber radially delimited by a tubular portion and fitted with an outlet passage that is opened/closed by an axially movable shutter. The servovalve is also integral with an axial stem, provided with a lateral surface, through which the outlet channel exits. The shutter is coupled to the stem in an axially sliding manner and, when it closes the outlet passage, it is subjected to substantially null axial fuel pressure. The outlet passage has a calibrated segment distanced from the shutter and close to a bottom wall of the control chamber. The calibrated segment is carried by an element fixed to the valve body in correspondence to an axial segment of the outlet passage.
Fuel injector with balanced metering servovalve, for an internal combustion engine, in which the servovalve controls a control rod movable along an axial cavity for opening/closing an injection nozzle, said servovalve having a valve body comprising a control chamber delimited, axially, by said control rod and, radially, by a tubular portions of said valve body, said control chamber having a calibrated inlet for fuel and an outlet passage comprising a calibrated segment, said valve body being integral with an axial guide stem for a shutter carried by a sleeve controlled by an electro-actuator, said outlet passage comprising at least one substantially radial segment that exits through a lateral surface of said stem, said sleeve being coupled in a fluid-tight manner with said stem in order to axially slide between a closed position and an open position of said substantially radial segment to control the axial movement of said control rod, wherein said calibrated segment is arranged in said outlet passage at a distance from said shutter.
Dependencies are inferred from the claim text.