PULSMODULIERTES HYDRAULIKVENTIL

摘要

A fast acting, electromagnetically actuated three-way miniature valve which is specifically useful for applications in automobile technology; for example, the electronically controlled pressure regulation in automatic transmissions. An example of the invention is characterized by the combination of: armature and obturator are a single solid unit, preferably manufactured out of one piece, and with a total mass of only a few grams; the valve stroke is significantly less than 0.5 mm, preferably 0.05-0.2 mm; the bearing arrangement for the valve obturator is such that a radial clearance of less than 0.05 mm is involved and the valve obturator is movable in the direction of the axis, and this bearing arrangement simultaneously guides the armature and also serves to separate two spaces of differing pressure; the valve obturator coordinates with two alternately closing valve seats; the seating surfaces of the armature, in both directions of movement, are exclusively defined by the valve obturator; the seating surfaces of the armature are perfused by the main oil stream prior to the armature reaching its final position; the valve seats feature approximately the same radius as the armature bearing, where the average radius of the valve seats does not deviate by more than +/--1 mm from that of the armature bearing, and where this deviation of the radii of the valve seats preferably shall not exceed 0.4 mm.