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Influence of Surface Pitting and Friction Coefficient on the Static Transmission Error in Spur Gears

Iqbal Shareef 1, Timothy L. Krantz 2, and Wasiq A.M Abdul 2
1. Department of IMET, Bradley University, Peoria, Illinois, USA
2. NASA Glenn Research Center, Cleveland, Ohio, USA
Dept of IMET, Bradley University, Peoria, Illinois, USA

Abstract—This research studies the performance characteristic, Static Transmission Error (STE), of a spur gear pair rotating under friction with and without damage in the form of a pit on gear teeth. Using a profilometer scan of a pit from an aerospace test gear, a damage shape in the form of parabolic profile pit is simulated on the surface of tooth of spur gear at seven different locations having three different sizes of the damage profile depth. Using the measured pit depth from profilometry, two additional pit depths were simulated by multiplying the initial profile depth by 5, and then by 10, for a total of three different profile depths having the same pit width. Similarly, six different coefficients of friction starting from zero to a maximum of 0.30 in the intervals of 0.06 were investigated. The combination of seven different locations of pits, six friction coefficients, and four pit depths resulted in a total of 168 unique combinations. Analyses were completed and multiple outputs responses including the STE were recorded, but only STE results are presented in this paper. Results show that STE variation increases with increase in friction coefficient and the size of damage.

Index Terms— static transmission error, tooth surface pitting, coefficient of friction, tooth load, contact pressure

Cite: Iqbal Shareef, Timothy L. Krantz and Wasiq A. M Abdul, "Influence of Surface Pitting and Friction Coefficient on the Static Transmission Error in Spur Gears" International Journal of Mechanical Engineering and Robotics Research, Vol. 9, No. 3, pp. 314-323, March 2020. DOI: 10.18178/ijmerr.9.3.314-323

Copyright © 2020 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.