Model formulation of churning losses in cylindrical roller bearings based on numerical simulation

Wenjun Gao (1, 2) , Daniel Nélias (1) , Nicolas Boisson (1) , Yaguo Lyu (2)

1 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
2 School of Power and Energy, Northwestern Polytechnical University

A numerical-based fluid mechanics model is proposed to predict churning losses in cylindrical roller bearings, which is caused by the rotation and the translation of the rollers in the bearing cavity. The Computational Fluid Dynamics (CFD) method is conducted to quantify the influence of various factors on churning losses, including operating conditions, roller geometry parameters, and fluid properties. One configuration with several in-line finite-length circular cylinders sandwiched by two flat walls is analyzed in one-phase environment, which represents a simplified approache. The results indicate that the roller orbital speed, the presence of adjacent rollers, and the rings have a significant impact on the churning moments. Finally a formulation is proposed for churning losses prediction in cylindrical roller bearings. This is of particular interest for high-speed applications where churning losses may represent up to 50 % of the total power dissipated.

Mots clés: Cylindrical roller bearings; Churning moment; Power losses; Roller orbital speed

Domaines: Sciences de l'ingénieur [physics]

Wenjun Gao, Daniel Nélias, Nicolas Boisson, Yaguo Lyu. Model formulation of churning losses in cylindrical roller bearings based on numerical simulation. Tribology International, 2018, 121, pp.420 - 434. ⟨10.1016/j.triboint.2018.02.003⟩. ⟨hal-01913786⟩