Fuel injector

摘要

A fuel injector for fuel-injection systems of internal combustion engines. The valve includes an electromagnetic actuating element having a solenoid coil, a fixed core, an outer magnetic-circuit component and a movable armature to actuate a valve-closure member which cooperates with a valve-seat surface provided on a valve-seat member. The valve is characterized by its extremely small outside dimensions. The entire axially movable valve needle, including armature and valve-closure member, has a mass of only m<=0.8 g. The valve is suitable as a fuel injector, especially for use in fuel-injection systems of mixture-compressing internal combustion engines with externally supplied ignition.

主权项

1. A fuel injector, having a longitudinal valve axis, for a fuel-injection system of an internal combustion engine, comprising: a valve needle; a valve closure member; a valve-seat member; and an excitable actuator, which includes an electromagnetic circuit having a solenoid coil, an internal pole, an outer magnetic-circuit component, and an armature, movable together with the valve needle, to actuate the valve-closure member that cooperates with a valve-seat surface on the valve-seat member; wherein the valve needle has a longitudinal extension along the longitudinal valve axis which is greater than a greatest radial expanse of the valve needle, wherein the entire axially movable valve needle, including the armature and the valve-closure member, has a mass of m<=0.8; and wherein the thin-walled valve sleeve extends over the entire axial length of the fuel injector, and the internal pole is displaceable within the valve sleeve to adjust the lift, and a zone having a magnetic flux density 0.0 IT