二次元フーリエ変換を用いた歯車歯面テクスチャの指向性解析

抄録

This study determines a new spatial parameter which have adaptability and expendability for surface textures of gear tooth flanks. Recently, advancing 3D measurement technology has caused the global shift of the trend of surface roughness parameters from profile surface texture analysis, defined in ISO 4287, to areal surface texture analysis, defined in ISO 25178. However, in the research field of transmission gear, the relation between features of areal surface texture of gear tooth flank and various phenomena (vibration, noise, friction, etc.) in power transfer process using gears hasn’t been sufficiently investigated. Moreover, the applicability of the newly defined areal roughness parameters such as Spatial parameters for surface textures of gear tooth flank has been also uncleared. This needs the specialized parameters that can capture the feature of 3D areal surface texture of gears. Thus, this paper tries to introduce a new parameter into the areal surface texture analysis of gear tooth flanks called “directivity”, which utilizes for a microphone or an antenna design in acoustics engineering. From the directional analysis of microphotographs of gear tooth surfaces using 2D-Fourier transform and template matching, we have clarified that a template visualizing “directivity” using a cassinian oval can feature the areal surface texture of gear tooth flanks.