石油套筒滚子链链轮齿形的优化设计

本文从链传动的运动学和动力学分析入手,着重对与轮齿曲线有关的链条爬链与跳齿、冲击振动、轮齿的抗弯强度与接触强度、容纳链节节距的伸长能力以及滚子进退啮合时的干涉条件等作了详细地分析和讨论,推出了链轮理论齿廓曲线方程,并得出了影响链轮齿廓曲线的因素关系式和一些有益的结论。针对目前石油套筒滚子链链轮齿形存在的缺点,提出了新的三段圆弧一段直线的新型齿形(即齿沟、工作段、齿顶过渡段为圆弧,齿顶为直线的齿廓曲线)。该齿形不但有较小的冲击应力、接触应力和爬链分力等,而且还能适应各种不同工况的要求。此外。本文还利用优化技术,分别按照不同工况(即高速轻载、低速重载、高速重载)进行了新齿形的优化,得出了最佳齿形方案。文中附有计算实例。

OPTIMAL DESIGN FOR TOOTH SHAPE OF SLEEVE ROLLER CHAIN SPROCKET

Detailed analysis and discussion are made based on the kinetics and dynamics of chain drive in the following aspects relating to tooth shape: chain disengagement,impact,bending strength and contact strength of sprockets,pitch tolerance and interference on mating of rollers.A theoretical tooth shape equation of the sprocket is derived,and an equation relating design parameters to the tooth shape is obtained also.Starting from the existing problems of sleeve roller chain sprockets used in oil fields a new tooth shape of three curved sections(tooth ditch,working section,and tooth top transition section)and one straight section(tooth top)is proposed.This tooth shape will result in less impact,less contact stress and less component causing disengagement,and accommodates a variety of working conditions.Optimal design has been made on different working conditions(high speed and light load,low speed and heavy load,high speed andheavy load).Examples are given also.