Fractal Prediction Model of Normal Contact Stiffness of Micro-pitting Gear

doi:10.3901/JME.2021.01.068

Abstract

Abstract: Micro-pitting is the initial failure feature of tooth surface with fatigue pitting. Estimating its normal contact stiffness is one important subject to study the dynamic fault characteristics of gear system. Combined the fractal parameters of surface morphology and the distribution area of contact points on the microscopic scale, the fractal model of joint surface with normal contact stiffness was established by studied the elastic-plastic contact mechanical properties of micro-convex, and the effect of microscopic elements on normal load and normal contact stiffness was analyzed qualitatively. The estimated fractal parameters for micro-pitting characteristic was established with the macroscopic physical dimension of involute gear and microscopic physical cause of micro-pitting, to studied normal contact stiffness of involute gear under different machining technology of tooth surface and different levels of micro-pitting. The result shows that the surface microscopic elements have different effects on normal load ang normal contact stiffness, and the elements have a certain relevance. The different surface contact coefficients are along the meshing point of the tooth profile, and improving the accuracy of the tooth surface (reducing the roughness) can improve the normal contact stiffness of the meshing tooth surface. The normal contact stiffness of joint surface of gear is lower significantly with the micro-pitting of tooth surface, and the simulation results are consistent with the actual engineering. The proposed mathematical model of micro-pitting can be used as a basis for analysis of dynamic response and expansion of micro-pitting.

Key words: gear, micro-pitting, normal contact stiffness, fractal theory, surface topology

CLC Number:

TH117

WANG Xiaopeng, LIU Shijun. Fractal Prediction Model of Normal Contact Stiffness of Micro-pitting Gear[J]. Journal of Mechanical Engineering, 2021, 57(1): 68-76.

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