共查询到19条相似文献,搜索用时 203 毫秒
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圆锥滚子直动从动件圆锥凸轮机构廓面方程的解析方法 总被引:9,自引:0,他引:9
应用单参数曲面族包络面理论分析和研究了圆锥滚子直动从动件圆锥凸轮机构,导出了圆锥凸轮廓面的数学表达式。为进一步分析及计算机辅助设计该类空间凸轮机构,奠定了理论基础。 相似文献
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在所述圆锥滚子球面凸轮机构中,滚子锥面的顶点与凸轮球面的球心重合。用球面坐标建立了此种凸轮工作廓面的解析设计方程和压力角公式,为此种凸轮的设计和数控加工提供了理论基础。指出该凸轮机构具有如下优点:①凸轮的工作廓面为可展直纹曲面,因而便于加工;②凸轮与滚子的接触线为直线;③在整个接触线上,凸轮与滚子之间皆为纯滚动,且压力角都相等。 相似文献
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对于圆柱滚子直动从动件圆锥端面凸轮机构,导出了凸轮的轮廓曲面方程,并给出了压力角计算式和设计计算框图,为此种凸轮机构的CAD/CAM提供了理论依据。 相似文献
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Conical cam mechanism has been widely used in modern machinery and equipment.However,the commonly used planar expansion methods for the design of spatial cam contour produce significant errors,because these methods incorrectly use the distance from the axis of the follower to the main conical cam to replace the corresponding arc length on the conical cam.HSIEH,et al,used analytical methods to achieve higher accuracy,but these analytical methods have their own drawbacks since they are too complicated for practical use.Through the analysis of the errors created during the generation of conical cam contour using the existing expansion methods,this paper proposes to include diverge angle in the calculation of conical cam rotation angle in the equation of conical cam contour expansion.This correction eliminates the error generated by the commonly used methods.Based on the expression of the follower’s 3D trajectory and the spatial geometry of conical cam,this paper has deduced the planar polar curve equation for determining polar coordinates for the curve of planar expansion outline.Furthermore,this paper provides an example of conical cam contour design based on sinusoidal acceleration variation.According to polar coordinates and the movement of curve equation function expression,this paper applies MATLAB software to solve coordinates for the cam expansion curve and uses AutoCAD software to generate conical cam expansion contour that meets the requirement of the law of motion.The proposed method provides a design process that is simple,intuitive and easy to master and implement.It also avoids the design error in the traditional methods for generating contour of conical cam with oscillating follower that requires high precision. 相似文献
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应用空间啮合原理和旋转变换矩阵理论,推导了圆锥滚子从动件圆柱分度凸轮的理论工作廓面方程及单侧面加工凸轮实际工作廓面方程;廓面采取单侧面加工时,给出了刀具误差对凸轮廓面法向误差影响的精确计算方法和近似计算方法,解决了空间凸轮廓面误差计算的难题,进一步完善了圆柱分度凸轮机构的设计和制造理论。 相似文献
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By employing the concept of equivalent linkage, this paper presents an analytical method for analyzing the mechanical errors
of disk cam mechanisms with a flat-faced follower. The resulting error equations do not really involve the location of the
curvature center of the cam profile, and locating the curvature center of the cam profile is not essential. The resulting
errors are significantly affected by the pressure angle, and the smaller pressure angle will result in the smaller mechanical
error. In the worst case, owing to the joined effects of various design parameters, the accuracy of the follower motion may
degrade considerably. For the oscillating follower case, all acceleration error functions have a sudden change at every beginning
and at every end of the motion even though the theoretical follower displacement is cycloidal motion. 相似文献
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David D. Ardayfio 《Mechanism and Machine Theory》1980,15(1):1-4
The Kinetothermoelastodynamic (KITED) model used is a single degree-of-freedom flexible cam-follower system in which the unconstrained thermal distortion of the cam is considered. The synthesis equation for the cam profile is derived for a prescribed follower acceleration in either analytical or numerical form. The technique is demonstrated by numerical examples. 相似文献
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