INFLUENCE OF COUNTER ROTATING BEARINGS IN TORQUE CALIBRATION DEVICES
Aimo Pusa, Michael Sachs
Abstract:
This article is concerned with the use of counterrotating mechanical bearings in torque calibration sys- tems. First a short overview on some general aspects of this bearing type will be given, which includes a general description of their construction as well as of their functionality. The main section deals with experimental examinations made on the performance of counterrotating bearings. These experiments were completed mainly using the horizontally arranged MIKES-RAUTE 2 kN·m torque standard calibra- tion device. Additionally initial results gained with the new vertically arranged 20 kN·m torque reference device are included. Main points of interest were the particular elements of the uncertainty budget as stated in EA-10/14. They are opposed for counterrotating and standing bearings. Also some investiga- tions about other error influences of the bearings are presented. Overall these results show that counterro- tated bearings can provide a strong reduction of uncertainty but also need some further investigation es- pecially in vertical devices.
