斜滚柱超越离合器的力学特性研究

发布时间：2018-06-26 19:24

本文选题：斜滚柱超越离合器 + 双曲面　；参考：《沈阳航空航天大学》2012年硕士论文

【摘要】：斜滚柱超越离合器是一种新型的可变扭矩离合器,它兼备离合器和轴承的双重功能,并具有优良的承载力及可靠性。目前,国内对斜滚柱超越离合器的研究尚处于初步阶段,因此对其进行相关理论研究和产品结构设计方面的进一步探索具有重要的实际意义。本文以斜滚柱超越离合器为研究对象。首先,根据滚柱与内外环曲面的接触关系,运用坐标变换和解析几何知识,推导出斜滚柱超越离合器内外环空间曲面的数学模型。先采用包络法求得内环曲面方程,再考虑滚柱与内外环间的啮合原理求得外环曲面方程,并验证了内外环曲面均为单叶双曲面的等距曲面,依次得出内外环轴向剖线方程,并求得内外环与滚柱之间的接触线方程为三维空间曲线,完成了产品数字化设计的理论求解。其次,对斜滚柱超越离合器进行了力学特性分析。通过滚柱与内外环间的运动关系,求得滚柱运动速度及轴向和切向滑动率表达式,并对滚柱与内外环中心轴线夹角对轴向滑动率和切向滑动率以及摩擦力矩与轴向力之比的影响、轴向力与摩擦力矩间的关系进行了分析。再次,基于三维设计软件PROE,利用上述推导出的斜滚柱超越离合器内外环轴向剖线方程,建立了内外环实体模型;又根据滚柱与内外环的空间接触关系建立了滚柱与内外环及保持架间的装配关系,从而创建出斜滚柱超越离合器的虚拟实体模型,为其产品结构设计提供可行思路。最后,利用有限元分析软件ABAQUS对斜滚柱超越离合器进行了接触应力分析,得出了假设条件下不同载荷作用时的内环最大接触应力;建立了一定载荷作用下滚柱与内外环接触的简化计算模型,分析了滚柱倾角及滚柱半径这两个重要参数对最大接触应力的影响,为降低局部应力、提高斜滚柱超越离合器的产品寿命提供了有效途径。
[Abstract]:Oblique roller overrunning clutch is a new type of variable torque clutch, which has dual functions of clutch and bearing, and has excellent bearing capacity and reliability. At present, the research on tilted roller overrunning clutch is still in the initial stage in China, so it is of great practical significance to carry on the related theoretical research and the further exploration of product structure design. In this paper, the oblique roller overrunning clutch as the research object. Firstly, according to the contact relationship between the roller and the inner and outer ring surface, the mathematical model of the outer and outer ring space surface of the oblique roller overrunning clutch is derived by using the coordinate transformation and analytic geometry knowledge. The inner ring surface equation is obtained by the envelope method, and then the outer ring surface equation is obtained by considering the meshing principle between the roller and the inner and outer ring. It is verified that the inner and outer ring surfaces are isometric surfaces with a single leaf hyperboloid, and the internal and external annular axial profile equation is obtained in turn. The contact line equation between the inner and outer ring and roller is found to be a three dimensional curve, and the theoretical solution of product digital design is completed. Secondly, the mechanical characteristics of overrunning clutch with inclined roller are analyzed. Through the motion relation between the roller and the inner and outer ring, the expressions of the velocity and the axial and tangential slip rate of the roller are obtained. The influence of the angle between the roller and the central axis of the inner and outer ring on the axial slip rate and tangential slip rate and the ratio of friction torque to axial force and the relationship between axial force and friction moment are analyzed. Thirdly, based on the three-dimension design software PROE, the internal and external ring solid model is established by using the above deduced axial profile equation of the inner and outer ring of the oblique roller overrunning clutch. According to the spatial contact relationship between the roller and the inner and outer ring, the assembly relationship between the roller and the inner and outer ring and the cage is established, thus the virtual entity model of the overrunning clutch with inclined roller is created, which provides a feasible way for the design of the product structure. Finally, the contact stress of oblique roller overrunning clutch is analyzed by using finite element analysis software Abaqus, and the maximum contact stress of inner ring under different load is obtained. A simplified calculation model of the contact between the roller and the inner and outer ring under certain load is established. The influence of the two important parameters, the angle of the roller and the radius of the roller, on the maximum contact stress is analyzed in order to reduce the local stress. It provides an effective way to improve the product life of tilted roller overrunning clutch.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.4

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