Electromagnetic hydraulic valve, in particular a proportional valve for controlling a device for adjusting the rotation angle of a camshaft relative to the crankshaft in an internal combustion engine, and a method for the production thereof

Abstract

An electromagnetic hydraulic valve (), which including an electromagnet () with an armature () and of a valve housing () with an axial bore () and a piston valve () located therein is provided. The valve housing () includes several annular grooves () in which several radial openings () are located, which open into the axial bore (), through which the hydraulic valve () has a fluid connection with a pressure connection (P), a tank connection (T) and two consumer connections (A, B). The piston valve () is acted upon by the armature () of electromagnet () and includes two ring-shaped control sections (), which connect alternatively the pressure connection (P) and the tank connection (T) with one of the consumer connections (A, B) through axial movement of piston valve (). According to the invention, the radial openings () in valve housing () are provided as windows having a rectangular cross section. The cross section surface, released from the control sections () of piston valve () form circular segments and can be changed in such a way that that flow through radial openings () in all of the positions of piston valve () is linear to each position of the armature () of the electromagnet ().