Patent ID: 8037869

Claim:
A fuel injector, comprising: a balanced metering servovalve for an internal-combustion engine, wherein the servovalve controls a control rod for controlling injection, which is mobile along an axial cavity, said servovalve having: a valve body comprising a control chamber provided with a calibrated inlet for the fuel, and an outlet passage in communication with an exhaust duct carried by an axial stem; an open/close element carried by a bushing being mobile along said stem and being controlled by an armature plate controlled by an electro-actuator, said exhaust duct comprising at least one substantially radial stretch that gives out onto a lateral surface of said stem; said bushing being normally coupled in a fluid-tight way with said stem so as to slide axially between a position of closing and a position of opening of said stretch; said bushing being kept in said closed position by elastic means; and wherein said armature plate is separate from said bushing and in that said elastic means act upon said bushing through an intermediate body for bringing said open/close element into said closed position, engagement means being provided for bringing said open/close element into said open position by said armature plate upon actuation of said electro-actuator, said armature plate comprising a plane surface designed to engage axially projection means carried by said bushing, a predetermined axial play being envisaged between said armature plate and said engagement means or said projection means to enable a relative axial displacement between said armature plate and said bushing.