Patent ID: 8616474
Filing Date: 2013-12-31
Classification: F02M,Y02T

Abstract:
1. An injector having an inlet and an outlet for injecting gaseous fuels into an internal combustion engine, the injector comprising: a valve body having an interior portion and a seat, an armature tube in the interior portion, the armature tube having a bore there-through, a valve member associated with the armature tube, a spring having an end engaging the valve member so that the valve member is biased by the spring towards the inlet into engagement with the seat, defining a closed position of the valve member, preventing fuel from exiting the outlet, an inlet tube defining the inlet of the injector, a movable, ferro-magnetic armature in the inlet tube and coupled to an end of the armature tube, the armature having a bore and an end surface, the bore of the armature communicating with the inlet and with the bore of the armature tube to provide a flow path from the inlet to the interior portion of the valve body, a calibration member engaged with the valve body and engaged with an end of the spring, opposite the end of the spring engaged with the valve member, a stator coupled to the inlet tube and having an end surface spaced from the end surface of the armature in the closed position of the injector, thereby defining a working air gap between the end surfaces, an electromagnetic coil disposed about a portion of the inlet tube, a ferro-magnetic housing surrounding at least a portion of the coil, wherein, when the coil is energized, magnetic flux across the working air gap moves the armature together with the armature tube towards the outlet so that the armature tube pushes the valve member off the seat to an open position while compressing the spring, permitting gaseous flow from the inlet to the interior portion, around the valve member and through the outlet.