Electromagnetic actuating device

Abstract

The invention relates to an electromagnetic actuating device (10) for a valve, having an armature (28) which is arranged in a hollow cylindrical armature chamber (28) so as to be axially displaceable between two axial stops (52, 54), wherein the armature chamber (26) is delimited by a magnet yoke (18; 22), wherein an electrical coil (24) extends coaxially around the armature (28), and wherein the magnet yoke (18, 22) is at least partially arranged in a housing (12). According to the invention, the actuating device (10) is characterized in that the armature (28) has a cylindrical geometry with a base (32) remote from the housing and with a hollow cylindrical end section (40) situated axially opposite, in that the base (32), which is remote from the housing, of the armature (28) is connected to an actuating plunger (34), in that a guide sleeve (42) is mounted axially onto the hollow cylindrical end section (40) of the armature (23), and in that, on that end of the guide sleeve (42) which is remote from the actuating plunger, there is arranged or formed an adhesion prevention device (84) which prevents or at least greatly impedes axial adhesion of the armature (28) to the magnet yoke (18, 22). The guide sleeve (42), which can be produced with very high accuracy in terms of manufacturing, with integrated adhesion prevention device (84) makes it possible to realize a reduction in width of the parasitic air gap between the armature (28) and the magnet yoke in order to increase the actuation forces of the actuating device (10) with a simultaneously reduced number of components.

Description

technical field [0001] The invention relates to an electromagnetic adjusting device for a valve, which has an armature which is arranged axially displaceable in a hollow-cylindrical armature space between two axial stops. In this case, the armature space is delimited by a magnetic yoke, in which the electric coil coaxially surrounds the armature, and in which the magnetic yoke is at least partially arranged in the housing. Background technique [0002] Solenoid-actuatable valves are used in many technical fields. Such valves are required, for example, for the operation of modern brake systems, hydraulic camshaft adjustments or automatic transmissions in motor vehicles. The armature required for the mechanical actuation of the adjusting piston of an electromagnetic adjusting device of such a valve is mounted in an axially displaceable manner, for example, in an armature guide tube. As an alternative to this, it is known to provide a slide ring radially outside the armature ...

AI Technical Summary

Problems solved by technology

[0004] Although this electromagnetic adjusting device itself has a rather advantageous design, it has the disadvantage that, in order to prevent the armature from sticking axially on the bottom of the first pot-shaped yoke, the stop sleeve is fastened to the armature, and For radial support of the armature in the armature space, the sliding ring is arranged in the annular groove of the armature

In addition, the sliding ring increases the required radial installation space of the adjusting device and it can disadvantageously have manufacturing-induced dimensional deviations

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