Actuator arrangement for use in a fuel injector

摘要

An actuator arrangement for use in a fuel injector of an internal combustion engine includes an inner core (40) comprising a collar (48) and a core region (44) having a plurality of laminates (140) stacked along a first lamination axis (LA), a first outer pole (42) of annular form 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). 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.