Proportional magnet for a hydraulic directional control valve and method for the production thereof

A proportional magnet for a hydraulic directional control valve, comprising:

• a coil unit including a cylindrical coil with a cylindrical opening, a pot-like open magnet casing that surrounds the coil and has a base with an opening and an open end face, an annular yoke disk arranged at the open end face of the magnet casing, and a housing;
• and
• a bearing unit including a yoke with a first bearing point, a pole core with a second bearing point, an armature unit with a magnet armature and a pressure pin, a centering sleeve coaxially orientating the first bearing point, the second bearing point and the armature unit, the centering sleeve being a separate element from the yoke and the pole core, the bearing unit being inserted into the cylindrical opening in the coil unit.

A method for producing a proportional magnet, comprising the following steps:

• manufacturing a coil unit from a housing part, a yoke disk, an electrical coil and a magnet casing;
• manufacturing a bearing unit from an armature unit having a magnet armature and a pressure pin, a yoke, a pole core, and a centering sleeve, with the armature unit being mounted in a first bearing point in the yoke and in a second bearing point in the pole core, and the yoke and pole core being separately arranged on the centering sleeve so that the centering sleeve coaxially orientates the first bearing point, the second bearing point and the armature unit;
• assembling the proportional magnet by inserting and axially fixing the bearing unit into a cylindrical opening in the coil unit and fixing a pole disk on the coil unit by press-fitting, adhesive bonding, welding or soldering so that a magnetic circuit is closed by means of the pole core, the pole disk, the magnet casing, the yoke disk and the yoke, and the bearing unit is axially fixed in the coil unit.