Patent ID: 7533831
Filing Date: 2009-05-19
Classification: F02M

Abstract:
1. A fuel injector for use in an internal combustion engine, the fuel injector having an injection nozzle comprising: a nozzle body being provided with a nozzle bore; an outer valve received within the nozzle bore and being engageable with a first seating to control fuel delivery through a first set of one or more nozzle outlets, the outer valve being provided with an outer valve bore; an inner valve received within the outer valve bore and being engageable with a second seating to control fuel delivery through a second set of one or more nozzle outlets; an injection control chamber for fuel; a pressure control arrangement for controlling the pressure of fuel within the injection control chamber; a first surface associated with the inner valve which is exposed to fuel pressure within the injection control chamber; and a second surface associated with the outer valve which is exposed to fuel pressure within the injection control chamber; wherein the first and second surfaces are arranged such that when the pressure of fuel within the injection control chamber is increased to a relatively high pressure, one of the outer valve or the inner valve is caused to disengage its respective seating and when the pressure of fuel with the injection control chamber is reduced to a relatively low pressure, the other of the outer valve or the inner valve is caused to disengage its respective seating; and wherein the inner valve is coupled to an inner valve carrier, the first surface being defined by the carrier.