In epicyclic gear sets aimed at aeronautical applications, planet-gears are generally supported by spherical
roller bearings with bearing outer race being integral to the gear hub. This paper presents a new method to
compute roller load distribution in such bearings where the outer ring can’t be considered rigid. Based on well
known Harris method, a modified formulation enables to account for centrifugal effects due to planet-carrier
rotation and to assess roller loads at any position throughout the rotation cycle. New model load distribution
predictions show discrepancies with results presented by Harris, but are well correlated with 1D and 3D Finite
Element Models. Several results validate the use of simplified analytical models to assess the roller load
distribution instead of more time consuming Finite element Models. The effects of centrifugal effects due to
planet-carrier rotation on roller loads are also analyzed. Finally the impact of the positions of rollers relative to
the gear mesh forces on the load distribution is shown.

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