Device for sensing a displacement for a linear drive, and linear drive

US7423421B2 · kind B2 · utility

Assignee

• WOCO Industrietechnik GmbH · DE

Inventors

• Uwe Reichert · Schlüchtern, DE
• Jurgen Schrepfer · Idstein, DE
• Ralf Sablotny · Bad Soden am Taunus, DE
• Stephan Thomas · Großkrotzenburg, DE
• Christoph Engel · Bad Orb, DE

Key dates

• Filing date: Feb 17, 2006
• Grant date: Sep 9, 2008
• Expiry date: May 4, 2026

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B15/2861
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A device for sensing the linear axial displacement of an actuator comprises, in one embodiment, a movable, elongated magnet coupled to the actuator and a fixed Hall sensor. A one-dimensional bearing for the magnet is designed to receive bearing forces in a direction radial to the axial direction by permitting a displacement and pivoting movement of the magnet around the one-dimensional bearing. Arranging the Hall sensor in the region of the one-dimensional bearing ensures that the spacing or gap between the magnet and the Hall sensor remains constant, even in case of a pivoting and/or radial movement of the actuator and of the magnet connected thereto along the full length of displacement of the actuator. Accordingly, the results in sensing the linear displacement of the actuator are not adversely affected by admissible deflections of the actuator from the axial direction of linear displacement.