Abstract: A shut off valve arrangement for use in a fuel injection system includes a shut off valve member operable between a closed position in which the shut off valve member is engaged with a shut off valve seating and an open position in which the shut off valve member is disengaged from the shut off valve seating to control the supply of fuel to the injector through a fuel supply passage. The shut off valve member includes a first surface that is exposed to fuel pressure within a shut off valve control chamber, a second surface exposed to fuel within the fuel supply passage and a third surface exposed to fuel pressure in a balance chamber, wherein the shut off valve arrangement is provided with a control valve for controlling the pressure of fuel within the shut off control chamber, thereby to control movement of the shut off valve member between the open and closed positions.

Abstract: A control valve arrangement for use in controlling fuel pressure within a control chamber (30) includes a control valve member (32) which is movable between a first position in which the control chamber (30) communicates with a source of high pressure fuel, and a second position in which the control chamber (30) communicates with a low pressure fuel drain and communication between the control chamber (30) and the source of high pressure fuel is broken. The control valve arrangement also includes restricted flow means (55, 70, 86) for restricting the rate of flow of fuel from the control chamber (30) to the low pressure fuel drain when the control valve member (32) is moved from the first position to the second position.

Abstract: An actuator arrangement for use in a fuel injector of an internal combustion engine, including an inner core (40) comprising a collar (48) and a core region (44) having a plurality of laminates (140) stacked in the direction of a first lamination axis (LA) and a first outer pole (42) for receiving at least a part of the core region (44). An electromagnetic winding (52) is received within a first volume defined between the first outer pole (42) and the core region (44). The collar (48) is formed from at least two collar parts (48a, 48b) which are adjustable relative to one another to alter the separation between them so as to accommodate core regions (44) of different diameter. The collar (48) is formed from a plurality of laminates (1, 2, 3, 4, 5) having a second lamination axis (A) which is perpendicular to the first lamination axis (LA).

Abstract: An actuator arrangement for use in a fuel injector of an internal combustion engine includes an inner core (30) comprising a plurality of laminates (30a) and a first outer pole (32) for receiving at least a part of the inner core (30), wherein the inner core (30) and the outer pole (32) together define a first volume (46) for receiving a first electromagnetic winding. An injector is provided in which the actuator arrangement controls a valve arrangement, either a spill valve or a nozzle control valve, or both, so as to control injection by the injector.

Abstract: A cam arrangement for use with a high pressure fuel pump arrangement for delivering fuel to an associated engine, the cam arrangement including at least two cams (28) that are mounted, in use, upon an engine camshaft and each of which is arranged to drive a respective pumping plunger (16) of the fuel pump arrangement, wherein each plunger is driven to perform a pumping stroke, against return biasing means (32), during which fuel within a pump chamber (22) associated with each plunger is pressurised, and whereby said return biasing means (32) effects a plunger return stroke, and wherein each cam (28) is oriented relative to the or each other cam and has a surface (50) shaped such that the associated plunger return stroke is interrupted to define at least one step of plunger movement that is substantially synchronous with the pumping stroke of another of the plungers (16) of the pump, thereby to reduce negative torque loading of the camshaft

Abstract: A fuel injector including a control valve arrangement for controlling fuel pressure within a control chamber comprises a control valve member which is movable between a first position in which the control chamber communicates with a source of high pressure fuel and a second position in which the control chamber communicates with a low pressure fuel drain and communication between the control chamber and the source of high pressure fuel is broken. The control valve arrangement includes a restricted flow path for restricting the rate of flow of fuel from the source of high pressure fuel to the control chamber when the control valve member is moved towards its first position. The provision of the restricted flow path prevents unbalanced hydraulic forces acting on the control valve member when the control valve member is moved towards its first position, which can otherwise lead to valve needle dither between injecting and non-injecting states.

Abstract: A fuel injector including a control valve arrangement for controlling fuel pressure within a control chamber comprises a control valve member which is movable between a first position in which the control chamber communicates with a source of high pressure fuel and a second position in which the control chamber communicates with a low pressure fuel drain and communication between the control chamber and the source of high pressure fuel is broken. The control valve arrangement includes a restricted flow path for restricting the rate of flow of fuel from the source of high pressure fuel to the control chamber when the control valve member is moved towards its first position. The provision of the restricted flow path prevents unbalanced hydraulic forces acting on the control valve member when it moves towards its first position, which can otherwise lead to valve needle dither between injecting and non-injecting states.

Abstract: A fuel injector including a control valve arrangement for controlling fuel pressure within a control chamber comprises a control valve member which is movable between a first position in which the control chamber communicates with a source of high pressure fuel and a second position in which the control chamber communicates with a low pressure fuel drain and communication between the control chamber and the source of high pressure fuel is broken. The control valve arrangement includes a restricted flow path for restricting the rate of flow of fuel from the source of high pressure fuel to the control chamber when the control valve member is moved towards its first position.