Abstract: A new type of radial-axial bearing integrated in the housing and output support mechanism of RV reducer is analyzed. Comprehensive consideration of the deformation compatibility conditions of the bearing under axial, radial loads, and moment loads, the static load model of the bearing is established. An accurate calculation method of the static load capacity of the bearing is established, too. The static model is verified by comparing the results with that calculated by finite element model. Considering the service condition of the bearings, the load distribution and static load capacity characteristics of the new bearing with different axial and radial clearances are analyzed. The results show that the allowable overturning moment of the bearing is significantly affected by axial clearance, while the allowable radial load is significantly affected by radial clearance. Furthermore, a new type of RV reducer with the integrated radial-axial roller bearing is trial-produced. The performance of the reducer is tested and the results show that the new RV reducer can not only withstand output torque but also withstand large axial loads and overturning moments. The new bearing is beneficial to improve the precision retention of the reducer and reduce the attenuation of torsional stiffness and backlash. The research can provide a theoretical basis for the selection and design of RV reducers.

Key words: RV reducer, main bearing, radial-axial bearing, load distribution, static load capacity