EP 2226514 B1 20111221 - Device for measuring the axial position of a piston rod relatively to a cylinder housing
Title (en)
Device for measuring the axial position of a piston rod relatively to a cylinder housing
Title (de)
Vorrichtung zur Messung der axialen Position einer Kolbenstange bezüglich eines Zylindergehäuses
Title (fr)
Dispositif de mesure de la position axiale d'une tige de piston par rapport à un boîtier de cylindre
Publication
Application
Priority
EP 09003286 A 20090306
Abstract (en)
[origin: EP2226514A1] The device has circular structures of bulges and recesses formed in a mantle surface of a piston rod (18), and a sensor device (28) for contactlessly scanning the structures using sensors e.g. magneto-resistive sensors, inductive sensors, eddy current sensors and ultrasound sensors, for determining an axial position of the rod. A wear-resistant cover guides the structures into a cylinder housing (10), where the structures concentrically surround the rod. The cover is formed as a pipe (26) that is coaxially pushed into the rod, and the structures form an absolutely coded solid unit. The piston rod is made of soft magnetic material or ultrasound reflecting material, and the pipe is made of magnetically transparent material or non-magnetic stainless steel e.g. austenitic steel, or ultrasound permeable material.
IPC 8 full level
F15B 15/28 (2006.01)
CPC (source: EP US)
F15B 15/2861 (2013.01 - EP US); F15B 15/2884 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 2226514 A1 20100908; EP 2226514 B1 20111221; AT E538317 T1 20120115; US 2010223982 A1 20100909; US 8151636 B2 20120410
DOCDB simple family (application)
EP 09003286 A 20090306; AT 09003286 T 20090306; US 65901110 A 20100223