Fuel injector

Abstract

A fuel injector includes a housing extending axially along an injector axis from a proximal end to a distal end and having a nozzle at the distal end; a pintle having an axially extending pintle shaft, the pintle being axially movable between an opened position and a closed position in which it closes the nozzle; and an armature arranged to be movable along the injector axis between a proximal position and a distal position and having an axial through-hole in which the pintle shaft is received. The armature includes an annular end wall portion defining a planar surface able to come at least partially into contact with a stopping surface in a rest position, the planar surface defining a contact plane transversal to injector axis. The annular end wall portion has inner and outer sides, each having an annular edge with the planar surface. Sides having their annular edge configured to come in contact with the stopping surface include a first surface, each first surface being at an angle inferior to or equal to 90° with the contact plane; and further comprise a second surface between their annular edge and their first surface, each second surface being at an angle superior to 90° with the contact plane. A projection of each second surface onto the contact plane is a ring of which the difference between the maximum radius and the minimum radius is smaller than 20 μm.

Dependencies are inferred from the claim text.