Actuator arrangement and fuel injector incorporating an actuator arrangement

A fuel injector for use in an internal combustion engine, the fuel injector including:

• a valve needle (16) which is operable by means of a valve arrangement so as to control injection by the injector, and
• an actuator arrangement for controlling the valve arrangement, wherein the actuator arrangement includes 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), a first outer pole (42) for receiving at least a part of the core region (44), and an electromagnetic winding (52) for receipt within a first volume defined between the first outer pole (42) and the core region (44), wherein 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, thereby to accommodate core regions (44) of different diameter.

A fuel injector for use in an internal combustion engine, the fuel injector including:

• a valve needle (16) which is operable by means of a valve arrangement so as to control injection by the injector, and
• an actuator arrangement for controlling the valve arrangement, wherein the actuator arrangement includes 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), a first outer pole (42) for receiving at least a part of the core region (44), and an electromagnetic winding (52) for receipt within a first volume defined between the first outer pole (42) and the core region (44), wherein the collar (48) is formed from a plurality of laminates (1, 2, 3, 4, 5) stacked in the direction of a second lamination axis (A) which is perpendicular to the first lamination axis (LA).