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Pump device for a brake system with a reluctance drive

  • US 10,683,857 B2
  • Filed: 04/18/2016
  • Issued: 06/16/2020
  • Est. Priority Date: 05/27/2015
  • Status: Active Grant
First Claim
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1. A pump device, comprising:

  • a housing;

    a pump piston;

    two hydraulic chambers that each include at least two fluid connections, and that are configured to cooperate with the pump piston;

    a linear drive embodied as a reluctance drive, and including;

    a longitudinally movable armature connected to the pump piston;

    a stator secured to the housing and configured to receive an applied current; and

    at least one resilient element associated with the armature, and configured to counteract a drive force of the reluctance drive,wherein the stator defines a first cylindrical face having a first axial length in a region of an air gap between the stator and the armature,wherein the armature defines a second cylindrical face having a second axial length in the region of the air gap,wherein the first axial length is equal to the second axial length,wherein the armature defines a neutral position relative to the stator in which (i) electrical current is applied to the stator and a resultant axial force is zero, and (ii) the armature and the stator are arranged at the same height with the first cylindrical face fully axially aligned with the second cylindrical face, andwherein the at least one resilient element is configured to urge the armature out of the neutral position.

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