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1. (WO2017055238) PATH MEASUREMENT DEVICE FOR A HYDRAULIC CYLINDER

Pub. No.:    WO/2017/055238    International Application No.:    PCT/EP2016/072903
Publication Date: Fri Apr 07 01:59:59 CEST 2017 International Filing Date: Wed Sep 28 01:59:59 CEST 2016
IPC: B21B 38/10
Applicants: PRIMETALS TECHNOLOGIES AUSTRIA GMBH
Inventors: DIRISAMER, Gernot
SCHALLAUER, Franz
Title: PATH MEASUREMENT DEVICE FOR A HYDRAULIC CYLINDER
Abstract:
The invention relates to a path measurement device (14) for a hydraulic cylinder (1, 2), preferably for an adjustment cylinder, said path measurement device (14) comprising a measurement housing (6) connectable to the hydraulic cylinder (1, 2), a guide element (11) guided such that is can move translationally in the measurement housing (6), which guide element (11) can be separately connected to the hydraulic cylinder (1, 2), and comprising a measurement device with a first measurement element (7) and a second measurement element (10) interacting with the first measurement element (7), wherein one of the measurement elements (7, 10) is attached to the measurement housing (6) and the other measurement element (10, 7) to the guide element (11) in order to carry out a path measurement by means of the two measurement elements (7, 10), using the relative movement of measurement housing (6) and guide element (11). In order to permit a continuous and virtually jolt-free path measurement, the invention provides that a recirculating ball guideway (8) is arranged between the guide element (11) and the measurement housing (6) for guiding the guide element (11) in the measurement housing (6), and that the recirculating ball guideway (8) is adjusted in clearance such that a tilting of the hydraulic cylinder (1, 2) of less that 5º is compensated for by the recirculating ball guideway (8).