| 摘要 |
An injector has an inlet and an outlet and an armature tube having passage structure and having a distal end spaced from the outlet. The passage structure communicates with the inlet. A movable, magnetic armature is coupled to the armature tube. An electromagnetic coil is associated with a stator and with the armature. A first spring is constructed and arranged, when the coil is not activated, to bias the armature tube so that the distal end engages in a sealing manner with a first seat to limit leakage of the gaseous fuel from the outlet. A second valve is movable in a valve body. A second spring is constructed and arranged, when the coil is not activated, to bias the second valve so that a seating surface thereof engages a second seat to close the outlet. |
| 主权项 |
1. An injector having an inlet and an outlet for injecting gaseous fuels into an internal combustion engine, the injector comprising:
an armature tube having passage structure and having a distal end spaced from the outlet, the passage structure communicating with the inlet, a movable, magnetic armature coupled to the armature tube to define a first valve, a stator spaced from the armature in a closed position of the injector, thereby defining a working air gap between the stator and the armature, an electromagnetic coil associated with the stator and the armature, a first seat associated with the distal end of the armature tube, a first spring constructed and arranged, when the coil is not activated, to bias the armature tube so that the distal end engages the first seat to close the passage structure and limit leakage of the gaseous fuel from the outlet, a valve body having an interior portion and a second seat at the outlet, a second valve movable in the interior portion of the valve body, and a second spring constructed and arranged, when the coil is not activated, to bias the second valve so that a seating surface thereof engages the second seat to close the outlet, wherein the first and second valves and the first and second springs are constructed and arranged such that when the coil is activated causing the armature and thus the armature tube to move with respect to the stator so that the distal end of the armature tube disengages from the first seat opening the passage structure and causing gaseous fuel to pass the first seat, pressure of the gaseous fuel causes the second valve to move against the bias of the second spring so that the seating surface disengages from the second seat to cause the gaseous fuel to exit the outlet, wherein the distal end of the armature tube includes an elastomer member constructed and arranged to engage the first seat in a sealing manner. |
