Patent ID: 8616473
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 in the form of a hollow tube having an interior portion, a hollow, non-metallic armature tube in the interior portion, a seal disk carried by the armature tube, a coil compression spring having a portion disposed in the armature tube, the spring having a first end associated with the seal disk, a seat, having a bore there-through defining the outlet, the seat including an annular seat surface engaged with the seal disk that is biased by the spring, when the injector is in a closed position, preventing fuel from exiting the outlet, a movable, ferro-magnetic armature coupled to an end of the armature tube, the armature having a bore and an outer periphery, a second end of the spring being received in the bore, an adjusting tube engaging the second end of the spring to adjust compression of the spring, a hollow, ferro-magnetic inlet tube defining the inlet, the adjusting tube being disposed in an interior of the inlet tube, an end surface of the inlet tube, opposite the inlet, being spaced from the periphery of the armature in the closed, thereby defining a gap between the end surface and the periphery, an electromagnetic coil disposed about a portion of the inlet tube, a ferro-magnetic flux member associated with the coil, and a housing covering at least a portion of coil, wherein, when the coil is energized, magnetic flux across the gap pulls the armature together with the armature tube towards the inlet so that the periphery of the armature engages the end surface of the inlet tube, thereby lifting the seal disk off of seat surface while compressing the spring, permitting gaseous flow from the inlet through the outlet.