Position measuring system for hydraulic cylinders

摘要

The system has permanent magnets (20) and a piston rod (10) with a metallic core (13) having higher magnetic susceptibility. A groove structure (11) is provided in an axial direction, where the structure is filled with a metal and comprises grooves. The magnetic susceptibility of the metal is less than that of the core, so that a sensor (30) measures the magnetic field of the magnets based on the position of the structure. An independent claim is also included for a method for manufacturing a piston rod.