Dynamic Response and Friction Torque Analysis of Slewing Bearings Under Service Conditions
LI Qiaoshuo
PANG Xiaoxu
JIANG Chongfeng
MAO Jingxi
ZHU Dingkang
ZUO Xu
YANG Minghao
Abstract：To investigate the influence of service conditions on the dynamic response and friction torque of slewing bearings-and to provide a reference for structural optimization and condition-adaptive design:a three-row roller slewing bearing was taken as the research object.A structural and contact mechanics model was established,and simulations were conducted based on a seven-stage service load spectrum(including no-load,high-speed and heavy-load scenarios,etc.).The accuracy of the multibody dynamics model was verified,and the dynamic responses and friction torque evolution of each row of rollers were analyzed.The results show that the maximum error of model validation is 3.19％,meeting the precision requirements.The upper thrust rollers exhibit more stable angular velocity under larger contact loads,the middle radial rollers show intense angular velocity fluctuations due to the absence of a cage,and the lower thrust rollers are prone to skidding due to clearance.The friction torque changes in a"stepped"periodic manner,peaking under high-speed and heavy-load conditions.The upper row of rollers contributes 61.77％of the total friction torque,with rotational speed and load having significant effects on torque.
Keywords：slewing bearingfriction torquedynamic responseservice conditions
Publication Date：2026-02-25
Online Publishing Date：2026-03-19(First online date of this platform, not the publication date of the document)
Pages：13( 63-75 )