薄壁交叉圆柱滚子轴承最佳径向工作游隙

以型号为RA8008UUCC0对数修形的薄壁交叉圆柱滚子轴承为分析对象,借助RomaxDesigner软件对比分析在联合载荷作用下径向工作游隙对承载滚子数、滚子最大载荷、滚道应力分布、轴承刚度、最小油膜厚度和疲劳寿命的影响情况,得出径向工作游隙是影响轴承力学性能的关键因素,结果表明:轴承受载滚子数随游隙的减小而增多,滚子与滚道接触应力分布趋于均匀化,相同条件下,倾覆力矩的影响比较显著。联合载荷作用下,随着工作游隙的减小,轴承刚度增大。当径向工作游隙小于-0.002mm时,随着径向工作游隙绝对值的增大,滚子与滚道接触变形减小,接触应力增大,刚度增大,最小油膜厚度减小,轴承寿命降低。同一径向工作游隙下,倾覆力矩可以减小滚子与轴承内外圈之间的油膜厚度,从而显著降低轴承疲劳寿命,轴承最佳径向工作游隙范围为-0.004~0mm。

Optimum radial working clearance of thin-walled crossed cylindrical roller bearings

Taking RA8008UUCC0 type of the thin-walled crossed cylindrical roller bearings under logarithmic modification as the analysis object, the effects of the radial working clearance on bearing roller number, roller maximum load, raceway stress distribution, bearing stiffness, minimum film thickness and fatigue life were analyzed comparatively under combined loads by RomaxDesigner software. It was concluded that the radial working clearance is the key factor affecting the mechanical properties of the bearings. Results showed that the number of the rollers loaded increased and the rollers and raceway contact stress distribution became uniform with the decrease of radial working clearance. Under the same conditions, the effect of tiling moment was significant. When the radial working clearance was less than -0.002mm, as the absolute value of the radial working clearance increased, the contact deformation between the rollers and the raceways decreased, the contact stresses and the stiffness increased, the minimum oil film thickness and the bearing life decreased. Under the same radial working clearance, the tiling moment can reduce the thickness of the oil film between the rollers and the inner and outer rings of the bearing, thereby significantly reducing the fatigue life of the bearing. The best bearing radial working clearance range was from -0.004mm to 0mm.