Combined modification method exploration of roller tangent and raceway full convexity based on optimal convexity ratio for cylindrical roller bearing
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摘要:
针对圆柱滚子轴承接触线上应力分布的不均匀问题,提出一种滚子相切与滚道全凸联合修形方法。在建立有限长线接触弹流润滑模型的基础上,探究分析了联合修形方法下的应力分布特点,给出了最优凸度比的计算方法(定义凸度比为滚子-滚道同时修形时滚子凸度量与滚道凸度量的比值)。结果表明:采用联合修形方法时,联合修形曲线存在最优凸度比,由载荷、总凸度量、直母线长度决定,在此最优凸度比下,接触应力存在3个相等的极值,接触应力的分布更加均匀,最大接触应力更小。此外,随着联合修形曲线的直母线长度增大,最大接触应力先减小后趋于稳定。研究成果为滚子-滚道接触副的修形设计提供一种可借鉴的新方法,该方法可以提高圆柱滚子轴承接触应力分布的均匀性。
Abstract:Aiming at the problem of uneven stress distribution on the contact line of cylindrical roller bearings, a combined modification method of roller tangent and raceway full convexity is proposed. Based on establishing the elastohydrodynamic lubrication model of finite line contact, the stress distribution characteristics under this modification method were explored and analyzed, and the calculation method of optimal convexity ratio was also provided (the convexity ratio is defined as the ratio of roller convexity to raceway convexity when roller-raceway is modified simultaneously). The results show that when using the combined modification method, there is an optimal crown ratio in the joint modification curve. This ratio is determined by the load, total convexity, and the length of the straight busbar. Within this optimal crown ratio, there are three equal extremes of contact stress, and the distribution of contact stress is more uniform. The maximum contact stress is reduced. Furthermore, with the increase of the straight bus length of the joint modification curve, the maximum contact stress initially decreases and then stabilizes. These research findings introduce a new reference method for the modification design of roller-raceway contact pairs, which can improve the uniformity of contact stress distribution of cylindrical roller bearings.
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表 1 最小膜厚的计算值与文献值对比
Table 1. Calculated value of minimum film thickness is compared with the literature value
项目 轴承载荷/kN 0.5 1 2 3 最小膜厚/µm 文献值 0.250 0.193 0.136 0.125 计算值 0.204 0.167 0.130 0.122 相对误差/% −18.4 −11.5 −4.41 −2.4 表 2 轴承及润滑油相关参数
Table 2. Bearing and lubricating oil related parameters
参数名称 数值 内径d/mm 35 外径D/mm 62 节圆直径dm/mm 48.5 滚子直径Dw/mm 6.5 滚子长度l/mm 6.5 综合弹性弹性模量E′/GPa 225.3 Barus黏压系数α/GPa−1 22 大气压下润滑油黏度η/(Pa·s) 0.08 大气压下润滑油密度ρ/(kg·m3) 875 表 3 不同修形方法的最大接触应力对比
Table 3. Comparison of the maximum contact stress of different modification methods
常规修形方法 最大接触
应力/GPa联合修形的最大
接触应力/GPa减小
百分比/%滚子相交修形 1.69 1.48 12.43 滚子全凸修形 1.62 1.48 8.64 滚子相切修形 1.56 1.48 5.13 表 4 不同修形方法的载荷分布均匀度对比
Table 4. Comparison of load distribution uniformity of different modification methods
常规修形
方法载荷分布
均匀度联合修形的载荷
分布均匀度减小
百分比/%滚子相交修形 1.37 1.15 16.06 滚子全凸修形 1.35 1.15 14.81 滚子相切修形 1.21 1.15 4.96 表 5 不同修形方法的最大接触应力对比
Table 5. Comparison of the maximum contact stress of different modification methods
常规修形
方法最大接触
应力/GPa联合修形的最大
接触应力/GPa减小
百分比/%滚子相切修形 1.55 1.50 3.23 滚子相交修形 1.86 1.50 19.35 滚子全凸修形 1.68 1.50 10.71 表 6 不同修形方法的载荷分布均匀度对比
Table 6. Comparison of load distribution uniformity of different modification methods
修形
方法载荷分布
均匀度联合修形的载荷
分布均匀度减小
百分比/%滚子相切修形 1.14 1.10 3.50 滚子相交修形 1.38 1.10 20.29 滚子全凸修形 1.27 1.10 13.39 -
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