共查询到16条相似文献,搜索用时 93 毫秒
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平面凸轮机构运动精度可靠性分析与数字仿真 总被引:6,自引:0,他引:6
运用微小位移的线性叠加原理,将平面凸轮类机构的凸轮与滚子的形状误差、铰链与移动副的间隙(包括磨损的影响)、凸轮及滚子的偏心、凸轮偏距圆尺寸误差等作为随机变量,建立了机构运动精度可靠性分析模型;利用计算机数字仿真技术,考察了机构各项误差导致的机构运动输出总误差对机构输出运动精度可靠度的影响,从中获得了一些有意义的结论。 相似文献
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介绍了一种新型滚子摆杆式凸轮机构的结构与工作原理。对该凸轮机构采用正弦曲线的形封闭误差和运动传递误差进行了理论分析。通过实例计算和结果分析,表明该凸轮理论廓线采用正弦曲线,在振幅较小时,有较好的形封闭性,适合用于高速凸轮。采用滚子摆杆传递运动误差较大,用于高速凸轮时必须改进。 相似文献
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研究了摆动滚子从动件凸轮机构的加工与从动件位移误差之间的关系。推导出了从动件位移误差计算公式,该公式可用于分析计算从动件位移误差。指出了合理选定凸轮机构的参数和加工精度。可减小从动件位移误差,提高摆动滚子从动件凸轮机构的运动精度。 相似文献
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文中研究一种使从动构件按预定运动规律转动的机构,该机构有一个用铰链连接在移动杆件上的凸轮,还有一个作定轴转动的滚子.凸轮匀速旋转且与滚子作纯滚动,滚子被凸轮带动作变速转动.通过运动分析,建立了凸轮形状与滚子转动规律的关系,从而控制了从动构件的转动规律. 相似文献
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于春玲 《机电产品开发与创新》2008,21(4):195-196
研究了弧面凸轮在加工过程中,由于中心距误差对从动滚子的运动精度影响,提出了安装过程中中心距误差对运动精度的影响。对提高蜗形凸轮的加工精度及机构的传动精度具有重要的指导意义。 相似文献
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对偏置直动盘形凸轮机构进行了运动分析,提出影响该凸轮机构运动精度的原因主要有尺寸间隙类因素、动态特性类因素。尺寸间隙类因素包括凸轮和滚子的几何尺寸和偏心尺寸、推杆偏置尺寸、转动副和移动副间隙尺寸及磨损量;动态特性类因素包括凸轮机构的运动加速度、凸轮曲线特性、转动惯性、弹簧回位滞后引起的推杆位置误差。具体阐述了影响运动精度的几种形式,并采用小位移的线性叠加原理计算了若干因素所引起的推杆位置误差。 相似文献
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以凸轮机构的轮廓曲线、运动可靠性及结构尺寸等为考虑因素,讨论凸轮机构从动件滚子半径与凸轮轮廓曲线、接触应力等的关系。提出滚子半径的选择原则。 相似文献
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Zongyu Chang Changmi Xu Tongqing Pan Lei Wang Xichao Zhang 《Mechanism and Machine Theory》2009,44(11):2079-2084
Indexing cam mechanism is one of most important mechanisms in automated machineries. This paper presents a general frame for kinematic analysis and geometry design of indexing cam mechanism, such as parallel cam mechanism and roller gear cam mechanism. This method applied screw theory to describe structure of cam mechanism and developed the kinematic equations by using Product of Exponentials Formula (PEF). As long as such structure parameters are given as position and orientation of central line in turret, cam and rollers, geometry modeling of indexing cam can be implemented in a general frame of kinematic equations by applying this method. The paper gives examples to obtain the geometry models of roller gear cam, barrel indexing cam and parallel indexing cam. Our work suggests that this method can avoid the burdensome work on building coordinate systems, transformation matrix and understanding on the mechanism. Moreover, this method can be used to innovate and design new types of indexing mechanism. 相似文献
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点啮合弧面凸轮分度机构的啮合理论及分析 总被引:11,自引:2,他引:9
采用腰鼓形圆锥滚子修形结构,实现了分度凸轮与滚子间在线接触上的点啮合,使机构在原滚子瞬时接触线上的可控点处完成共轭运动。这样,既降低了机构本身对各种误差的敏感度,使之具有良好的适应性,又可保证其使用性能。 相似文献
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以对心直动滚子从动件盘形凸轮机构设计为例,介绍了在Pro/E环境下盘形凸轮的参数化设计及凸轮机构的运动仿真。并利用Pro/E的Mechanism模块对其进行运动学分析,得到可视化的运动进程图形。通过运动仿真验证了凸轮机构设计的准确性,为在Pro/E中实现凸轮的无图加工及运动、动力分析提供了必备的实体模型。 相似文献
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Without modifying the cam contour, a cam mechanism with a variable input speed trajectory offers an alternative solution to flexibly achieve kinematic and dynamic characteristics, and then decrease the follower’s residual vibration. Firstly, the speed trajectory of cam is derived by employing Bezier curve, and motion continuity conditions are investigated. Then the motion characteristics between the plate cam and its roller follower are derived. To analyze the residual vibration, a single degree of freedom dynamic model of the elastic cam-follower system is introduced. Based on the motion equation derived from the dynamic model, the residual vibration of the follower is yielded. The design procedure to improve the kinematic and dynamic motion characteristics is presented and two design examples with discussions are provided. Finally, the simulations of the kinematic and dynamic models by ADAMS are carried out and verified that the design models as well as the performances of the mechanism are feasible. 相似文献