双列调心滚子轴承摩擦力矩的特性

基于滚动轴承的动力学理论，建立了双列调心滚子轴承动力学微分方程与摩擦力矩数学模型，采用预估-校正GSTIFF(gear stiff)变步长积分算法求解其动力学微分方程，研究了结构参数和工况参数对双列调心滚子轴承摩擦力矩特性的影响。研究结果表明:较小的内滚道密合度与较大的外滚道密合度有利于降低轴承的摩擦力矩；过大、过小的保持架兜孔曲率半径都不利于轴承摩擦力矩的降低，存在一个合理的保持架兜孔曲率半径使轴承摩擦力矩最小；保持架兜孔间隙对轴承的摩擦力矩影响较小，适当增大保持架引导间隙可有效减小轴承的摩擦力矩；适量的增大双列调心滚子轴承径向游隙有利于降低轴承的摩擦力矩。 

Friction torque of double-row spherical roller bearings

Based on the dynamic theory of rolling bearings, the dynamic differential equations and the friction torque mathematic models of double-row spherical roller bearings were established. GSTIFF (gear stiff) integer algorithm with variable steps was used to solve the equations. The influences on friction torque of double-row spherical roller bearings caused by working conditions and structural parameters were investigated. The results show that: small inner ring osculation is useful to reduce the friction torque. Increasing outer ring osculation results in reduction of the friction torque. Too large or too small pocket curvature radius is not conducive to reducing the friction torque. There is a reasonable pocket curvature radius to get the lowest friction torque. The effect of cage pocket clearance on the bearing friction torque is small. A proper bigger cage guiding clearance is beneficial to reducing the friction torque. Properly increasing the radial clearance of double-row spherical roller bearings is useful to reduce the friction torque.