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Electromagnetic actuating unit for a hydraulic directional control valve and method for the assembly thereof

  • US 8,350,652 B2
  • Filed: 10/19/2009
  • Issued: 01/08/2013
  • Est. Priority Date: 11/26/2008
  • Status: Active Grant
First Claim
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1. An electromagnetic actuating unit for a hydraulic directional control valve, comprising:

  • a housing for conducting a magnetic flux;

    a coil for generating a magnetic field in the housing;

    a yoke unit having a yoke in the coil, a yoke plate axially adjacent the coil and a first bearing point;

    a pole core unit having a pole core in the coil and a second bearing point;

    an armature unit arranged in the coil having an armature and a pressure pin acting as an actuator, the armature unit is mounted, so as to be slidable in a direction of a longitudinal axis, in the first bearing point and in the second bearing point;

    wherein, in a first assembly state of the actuating unit, at least one of the first bearing point or the second bearing point is radially movable and, in a second assembly state, after a coaxial alignment of the first bearing point and the second bearing point, at least one of the first bearing point and the second bearing point is fixed; and

    a centering sleeve arranged in the coil, the centering sleeve servers for a radial alignment of the first bearing point and the second bearing point during assembly.

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