Surface Morphology Models of Cycloid and Pin Teeth Based on Fractal Theory and Differential Geometry

doi:10.7652/xjtuxb201711014

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Surface Morphology Models of Cycloid and Pin Teeth Based on Fractal Theory and Differential Geometry

更新时间：2025-07-09

- Surface Morphology Models of Cycloid and Pin Teeth Based on Fractal Theory and Differential Geometry
- Vol. 51, Issue 11, Pages: 97-105+136(2017)
- 作者机构：
  
  1. 北京科技大学机械工程学院,北京,100083
  2. 华北理工大学机械工程学院,河北,唐山,063210
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201711014
  CLC： TH114
- Online First：10 November 2017，
  
  Published：2017
- 稿件说明：
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Surface Morphology Models of Cycloid and Pin Teeth Based on Fractal Theory and Differential Geometry[J]. 2017, 51(11): 97-105+136.
DOI：

Surface Morphology Models of Cycloid and Pin Teeth Based on Fractal Theory and Differential Geometry[J]. 2017, 51(11): 97-105+136. DOI： 10.7652/xjtuxb201711014.

摘要

根据分形理论与微分几何

应用Weierstrass-Mandelbrot函数与矢量函数构建了摆线轮齿与针齿的表面形貌模型

该模型综合体现了摆线轮齿与针齿的宏观特征与微观特征; 应用MATLAB绘制了各向同性粗糙针齿及单个摆线轮齿的二维截面图

构建了摆线轮齿与针齿的接触比例系数。通过分析可知:接触比例系数随啮合点的变化而变化

且针齿与摆线轮齿内凹部分接触时的接触比例系数远大于针齿与摆线轮齿外凸部分接触时的值; 接触比例系数随分形维数的增加而减小

随摆线轮与针轮中心距的增加先增大后减小

随特征尺度、针齿半径和针轮齿数的增加而增大。

Abstract

The key point to analyze the contact characteristics of cycloid and pin wheels is to establish a contact model with comprehensive embodiment of the gross feature and micro-characteristic. A surface topography model of rough surfaces is established based on Weierstrass-Mandelbrot function and differential geometry. The function of cycloid is determined by using a vector function with modification being taken into account. The unit normal vector is calculated with the application of differential geometry. The 2D sections of a pin tooth and a cycloid tooth which is assumed as isotropic are plotted by MATLAB. The contact model between cylinder and rigid flat is established

a parameter called equivalent contact angle is proposed

and the relations of the angle with fractal dimension

characteristic scale and radius of cylinders are studied. Furthermore

the contact proportionality coefficient that is used to describe the contact area between cycloid and pin tooth surfaces is given. The coefficient is less than 1 in any case

and the value for the area between pin tooth and inter part of cycloid is much larger than that for the area in outer part of cycloid. It is indicated by analysis that the value of the coefficient decreases with the increase of the fractal dimension

increases at first and then decreases with the increase of the center distance

and increases with the increase of pin tooth radius

characteristic scale

and number of pin teeth.

关键词

Keywords

references

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