Fuel injection valve

摘要

A fuel injector for fuel-injection systems of internal combustion engines includes an electromagnetic actuating element having a solenoid coil, a fixed core, an outer magnetic circuit component, and a movable armature for actuating a valve-closure element, which cooperates with a valve-seat surface provided on a valve-seat element. The injector is characterized by its extremely small outer dimensions. The flexibility in the installation of fuel injectors of varying valve lengths, which is made possible very simply due to the special modular design, is significantly increased in this manner. An optimized dimensioning of the electromagnetic circuit allows for a DFR (dynamic flow range) greater than 17, the DFR being defined as the quotient of qmax/qmin.

主权项

1. A fuel injector for a fuel-injection system of an internal combustion engine, the fuel injector having a longitudinal axis, comprising:
a valve unit defined by a valve-closure element and a valve seat body; an excitable actuator in the form of an electromagnetic circuit having the following components:
a solenoid coil,an inner pole,an outer magnetic circuit component, anda movable armature, wherein the movable armature actuates the valve-closure element, which cooperates with a valve seat surface provided on the valve seat body; and a thin-walled valve sleeve which extends at least in the region of the electromagnetic circuit; wherein an outside diameter DM of the outer magnetic circuit component in a circumferential region of the solenoid coil is dimensioned to be 10.5 mm0.3 T, or (ii) a portion having a magnetic flux density B>0.1 T is provided in a region of a working air gap in the valve sleeve.