Pitting and micropitting are the two main gear rolling contact fatigue modes. It is widely accepted that micropitting will lead to pitting; however, the relationship between pitting and micropitting life needs further investigation. In this work, micropitting and pitting tests were performed on an FZG back-to-back test rig using standard FZG PT-C and GF-C gears. The gear tooth profile change due to micropitting and pitting damage was measured in situ in the gearbox using a profilometer after each test. The gear surface roughness parameters were calculated from the measured tooth profile. A Gaussian low pass filter with cut off length λ c = 0 . 8 mm was applied to the measured tooth profile to obtain the waviness. The calculated roughness parameters and the obtained tooth profile with waviness for each test were imported into the KISSsoft software to calculate the contact stress and specific film thickness at the corresponding load stage. Experimental results show that smooth gear surface can reduce or even avoid micropitting damage, but could lead to a reduction in pitting life.

中文翻译：

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齿轮表面粗糙度对点蚀和微点蚀寿命的影响

点蚀和微点蚀是两种主要的齿轮滚动接触疲劳模式。人们普遍认为微点蚀会导致点蚀；然而，点蚀和微点蚀寿命之间的关系需要进一步研究。在这项工作中，使用标准 FZG PT-C 和 GF-C 齿轮在 FZG 背对背试验台上进行微点蚀和点蚀试验。每次测试后使用轮廓仪在齿轮箱中原位测量由于微点蚀和点蚀损坏引起的齿轮齿廓变化。齿轮表面粗糙度参数由测量的齿廓计算。截止长度为 λ c = 0 的高斯低通滤波器。将 8 毫米应用于测量的齿形以获得波纹度。将计算出的粗糙度参数和每次测试获得的带波纹度的齿廓导入到KISSsoft软件中，计算相应载荷阶段的接触应力和比膜厚。实验结果表明，光滑的齿轮表面可以减少甚至避免微点蚀损伤，但会导致点蚀寿命的减少。