Patent ID: 9127633
Filing Date: 2015-09-08
Classification: F02M,Y10T

Abstract:
1. An actuator arrangement for an electromagnetically operated fuel injector, the arrangement comprising: a generally cylindrical actuator core having a longitudinal axis and defining, at an end thereof, an inner pole face of the actuator arrangement, the actuator core being formed of a bespoke magnetic material having a relatively high magnetic permeability; a wire coil disposed around the actuator core and arranged to be connected to a power source in use so as to generate a magnetic field around the coil; a pole member formed of a high strength material having a relatively low magnetic permeability and defining an aperture for receiving the actuator core, the pole member defining an outer pole face of the actuator arrangement, the outer and inner pole faces being substantially co-planar; and an armature moveable in a direction parallel to the longitudinal axis in response to the magnetic field in use of the actuator arrangement wherein, in use of the actuator arrangement, the magnetic field passes (i) into the armature in the region of the inner pole face and (ii) into the armature in the region of the outer pole face.