双排非对称四点接触球转盘轴承刚度分析

发布时间：2019-04-18 07:56

【摘要】：随着轴承空间限制和高承载能力的目标要求,对传统负游隙对称型(初始接触角α01=α02=45°)双排四点接触球转盘轴承进行改进,提出负游隙非对称型接触角设计(α01为35°~60°,α02为90°-α01),并基于赫兹接触理论和滚动轴承设计方法建立负游隙非对称双排四点接触轴承的力学模型。结果表明:随着单向载荷轴向力Fa、径向力Fr和倾覆力矩M增加,主刚度在开始阶段基本呈下降趋势,随着单向载荷的增加非线性上升,负游隙的影响使得轴承的刚度变化曲线存在一个临界拐点;初始阶段随着轴向负游隙量的增加,轴承的初始预紧刚度都得到明显提高,但随着载荷的增加负游隙对轴承刚度的影响逐渐减弱,最终基本趋于一致;单向载荷条件下,当轴向负游隙为-0.03 mm和非对称接触角取α01=55°,α02=35°时,其综合轴承刚度最好;综合外载工况下,负游隙取-0.03 mm和非对称接触角取α01=60°,α02=30°或α01=35°,α02=55°时轴承综合刚性最佳。从提高轴承综合刚性角度考虑,非对称接触角设计和负游隙都可以起到明显效果。
[Abstract]:With the requirement of bearing space limitation and high bearing capacity, the traditional double row four-point contact ball rotary disk bearing with negative clearance symmetry (initial contact angle 伪 01 = 伪 02? 45 掳) is improved, and the asymmetric contact angle design with negative clearance (伪 01 is 35 掳~ 60 掳) is proposed. 伪 02 is 90 掳- 伪 01). Based on Hertz contact theory and rolling bearing design method, the mechanical model of negative clearance asymmetric four-point contact bearing is established. The results show that with the increase of the radial force Fr and the overturning moment M of the unidirectional load Fa, the principal stiffness basically decreases at the initial stage, and the nonlinear increases with the increase of the unidirectional load. Because of the influence of negative clearance, there is a critical inflection point in the stiffness curve of bearing. In the initial stage, with the increase of axial negative clearance, the initial pre-tightening stiffness of bearing increases obviously, but with the increase of load, the influence of negative clearance on bearing stiffness decreases gradually, and finally tends to the same. Under unidirectional load, when the axial negative clearance is-0.03 mm and the contact angle is 伪 01 / 55 掳and 伪 02 掳/ 35 掳, the stiffness of the bearing is the best. Under the combined external load condition, when the negative clearance is-0.03 mm and the asymmetric contact angle is 伪 01 / 60 掳, 伪 02 / 30 掳or 伪 01 掳/ 35 掳and 伪 02 掳/ 55 掳, the overall rigidity of the bearing is the best. Considering the improvement of bearing rigidity, the design of asymmetric contact angle and the negative clearance can play an obvious role.
【作者单位】：河南科技大学机电工程学院;空调设备及系统运行节能国家重点实验室;洛阳鸿元轴承科技有限公司;
【基金】：国家科技攻关项目(JPPT-ZCGX1-1) 空调设备及系统运行节能国家重点实验室开放基金项目(SKLACKF201603) 河南省自然科学基金项目(162300410086)
【分类号】：TH133.3

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