ON THE MEASUREMENT PROCEDURE FOR TESTING FRICTION IN BEARING BOXES

The aim of this research is friction measurements on the bearing boxes of a testing rig for parallel axes transmissions. Friction in the transmission without bearings is calculated by subtracting the bearing friction from the global friction. This is why it is of maximal importance in the correct evaluation of friction losses to have accurate data on the friction on bearings. This paper is presenting the main specific aspects of the measurement procedure that must be carefully considered for accurate results. Finally, the friction torque in bearing boxes is presented depending on rotational speed, load, and lubricating oil temperature.