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Abstract
Lubricants have a large influence on gearbox power losses. Recent investigations at a gear efficiency test rig have shown the high potential of water-containing gear fluids in drastically reducing load-dependent gear losses and temperatures. In this study, the bearing power losses with water-containing gear fluids were evaluated at a specific bearing power loss test rig explicitly and compared with mineral and polyalphaolefine oils. For all investigated lubricants, a Stribeck curve behavior of the load-dependent losses is observed. The water-containing gear fluids demonstrate lower no-load bearing losses and higher load-dependent bearing losses at higher rotational speeds. The comparison of measured bearing losses with typical calculation procedures showe partially large differences. The results underline the importance of having detailed knowledge of bearing losses when evaluating gear losses in gearboxes.
Highlights
Bearings in gearboxes ensure guidance of shafts and bearing of axial and radial forces
Hinterstoißer et al [1,2] and Jurkschat et al [3] used a bearing power loss test rig to analyze the influence of operating conditions on roller bearing losses under dip lubrication
The results show a great potential of water-containing gear fluids to reduce friction and improve gearbox efficiency compared to conventional gear oils
Summary
Bearings in gearboxes ensure guidance of shafts and bearing of axial and radial forces. Bearing power losses can be divided into no-load and load-dependent losses. Hinterstoißer et al [1,2] and Jurkschat et al [3] used a bearing power loss test rig to analyze the influence of operating conditions on roller bearing losses under dip lubrication. Their results show a degressive increase of no-load losses with increasing rotational speed. In case of load-dependent losses, a Stribeck curve behavior of the measured load-dependent losses was observed with increasing rotational speed. Aul et al [4]
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