초록 ▼

The injector comprises a balanced metering servovalve for controlling a rod for opening/closing a nebulizer. The servovalve has a valve body having a control chamber provided with an outlet passage that is opened/closed by an axially mobile open/close element. The open/close element is made of a sin

The injector comprises a balanced metering servovalve for controlling a rod for opening/closing a nebulizer. The servovalve has a valve body having a control chamber provided with an outlet passage that is opened/closed by an axially mobile open/close element. The open/close element is made of a single piece with a bushing separate from an armature plate of an electromagnet. The bushing is coupled to a stem in an axially slidable way for closing an exhaust duct in communication with the outlet passage The open/close element is kept in a closed position by a spring that acts upon the bushing through an intermediate body connected thereto. The armature plate can be displaced with respect to the bushing between a flange of the intermediate body and a shoulder of the bushing, for eliminating the rebounds of the open/close element upon closing of the servovalve.

대표청구항 ▼

The invention claimed is: 1. 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

The invention claimed is: 1. 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; andwherein 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.