| 摘要 |
A common rail fuel injector includes a control valve member unattached to, but trapped between, a push pin and a seat of an injector body. The push pin has a head that includes a contact surface and a crown that includes a stop surface. An air gap surface of an armature is located between a top of the head and the stop surface of the crown when the contact surface of the push pin is in contact with the armature. The stop surface of the crown is located between an air gap plane of a stator assembly and the air gap surface of the armature. The push pin, the armature and the control valve member are movable among a rest configuration, an injection configuration, and an over travel configuration. |
| 主权项 |
1. A fuel injector comprising:
an injector body defining a common rail inlet, a nozzle outlet and a drain outlet; a solenoid actuator disposed in the injector body and including an armature that moves with respect to a stator assembly, which includes a pole piece and a stop pin that are flush at an air gap plane; a control chamber disposed in the injector body; a check valve member with a closing hydraulic surface exposed to fluid pressure in the control chamber, and being movable between a closed position blocking the nozzle outlet and an open position fluidly connecting the common rail inlet to the nozzle outlet; and a control valve member unattached to, but trapped between, a push pin and a seat of the injector body, and being movable between a closed position in contact with the seat, and an open position out of contact with the seat to fluidly connect the control chamber to the drain outlet; the push pin has a head that includes a contact surface below a top of the head, and a crown that includes a stop surface, the contact surface being an undersurface of the head and configured to contact the armature in a rest configuration, the top being below an air gap surface of the armature; the air gap surface of the armature is located between the top of the head and the stop surface of the crown when the contact surface of the push pin is in contact with the armature; the stop surface of the crown is located between the air gap plane and the air gap surface of the armature; and the push pin, the armature and the control valve member being movable among the rest configuration, an injection configuration and an over travel configuration, and the contact surface of the push pin being out of contact with the armature in the over travel configuration. |
