负游隙薄壁四点接触球轴承空载下的摩擦力矩计算

Calculation on Friction Torque of Thin Wall Four-Point Contact Ball Bearings with Negative Clearance Under No- Load

介绍了负游隙四点接触球轴承游隙的计算方法,以空载状态下的薄壁四点接触球轴承QJ1830为例,考虑了负游隙状态下套圈变形对钢球与沟道间接触载荷的影响,分析了影响该轴承摩擦力矩的主要因素,最后根据能量守恒定律计算了该轴承空载状态下的摩擦力矩,并与实测值进行了对比,结果表明:游隙值越小,摩擦力矩的理论计算值相对实测值的误差越小,当游隙小于-7μm时,误差小于30%。

The calculation method is introduced for clearance of four point contact ball bearing under negative clear-ance.Taking the thin-walled four point contact ball bearing QJ1830 under no-load as an example,the influence of rings deformation on contact load between steel ball and raceway under negative clearance is considered,and the main factors affecting friction torque of bearing are analyzed.The friction torque of bearing under no-load is calculated ac-cording to conservation law of energy and compared with the measured value.The results show that the less the clear-ance is,the less the error between the theoretical calculating value and the measured value of friction torque is.The er-ror is less than 30% when the clearance is less than -7 μm.