Optimized armature assembly guidance for solenoid valves

Abstract

The invention relates to a fuel injector having a solenoid valve which actuates a multi-part armature assembly. The armature assembly comprises an armature bolt (10), an armature bolt (10) which is acted on by a valve spring (24), and an armature plate (70). As a result of the lifting motion of the armature bolt (10), a closing element (6) is opened or closed, whereby an injection valve member (60) can be actuated, in order to relieve the pressure in a control space (48). The armature plate (70) is guided, decoupled from the armature bolt (10), on an armature guide (28).

Description

technical field [0001] The invention relates to an optimized armature group guide for solenoid valves. Background technique [0002] DE 196 50 865 A1 describes a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve such as a common rail injection system. The stroke movement of the valve piston is controlled by the fuel pressure in the control chamber, by means of which the injection openings of the injection valve are opened or closed. The solenoid valve consists of an electromagnet, a movable armature and a valve element which moves with the armature and is loaded in the closing direction by the valve closing spring, which cooperates with the valve seat of the solenoid valve and thus controls the fuel flow from the control chamber. discharge. [0003] A common rail injector with a two-piece armature is known, which is attracted by a solenoid valve. The armature applies the closing force to the valve ball in the absence of current. ...

AI Technical Summary

Problems solved by technology

[0005] In current series production there is the problem that the valve spring, which exerts the closing force on the armature pin, introduces a lateral force component into the assembly consisting of the armature plate and the armature pin

[0007] Furthermore, it has been found that due to the above-mentioned overall tilting of the armature plate and the armature pin with respect to the main axis of the injector at the tilting angle α, a small residual air gap between the armature plate and the magnet armature can result in a Collisions between the armatures, on the other hand, also generate a magnetic force distributed unevenly over the circumference when the remaining air gap does not extend uniformly

This increases the randomly generated friction and thus affects the quantity of fuel injected with the fuel injector into the combustion chamber of the internal combustion engine

Inhomogeneously distributed magnetic forces also lead to bending of the armature pin and thus to poor armature guidance, since a greater frictional force component develops

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