IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1468-1477    Article in Press

PDF URL: http://www.ije.ir/Vol30/No11/B/19.pdf  
downloaded Downloaded: 0   viewed Viewed: 166

( Received: June 09, 2017 – Accepted: September 08, 2017 )

Abstract    Theoretical and experimental investigation of wear during coupling in internal gears coated with various polymeric coating materials was performed. In the theoretical part of the study, Archard’s wear formulation was adapted to internal gears and wear behaviour in different conditions was determined. Moreover, a fatigue and wear testing apparatus having similar working principle with FZG (Forschungsstelle für Zahnrader und Getreibbau) closed circuit power circulation system was designed and manufactured to experimentally investigate the wear in internal gears. Internal gear-pinion couples manufactured from St50 material were coated with various polymeric materials (PTFE (polytetrafluoroethylene), MoS2 bonded with polyamide, MoS2 bonded with epoxy) in the experimental study. An uncoated internal gear was also investigated to find out the performance of coated gears. Wear values in the teeth profiles of internal gears were determined theoretically and experimentally. Theoretical and experimental studies showed that polymeric coated internal gears have more wear resistance than uncoated ones. It is also observed that coating increases the wear strength of internal gears.


Keywords    Internal gear, rolling-sliding wear, wear testing, coating materials


References    [1] Chen, Z., Shao, Y., “Mesh stiffness of an internal spur gear pair with ring gear rim deformation”, Mechanism and Machine Theory, Vol. 69, (2013), 1-12. [2] Tunalıoğlu, M. Ş., “A research of tooth profile damages in internal gears”, Gazi University Institute of Science and Technology, Ph. D. Thesis, Ankara, (2011), 1-5. [3] Terauchi, Y., Nagamura, K., Ikejo, K., “Study on friction loss of internal gear drives”, JSME International Journal Series III, Vol. 34, (1991), 106-113. [4] Mansfield, A. K., “Teeth of internal gears”, Journal of the Franklin Institute, (1977), 17-20. [5] Tong, B. S., Walton, D., “A computer design aid for internal spur and helical gears”, Int. J. Mach. Tools Manufact., Vol. 27, (1987), 479-489. [6] Tong, B. S., Walton, D., “The optimization of internal gears”, Int. J. Mach. Tools Manufact., Vol. 27, (1987), 491-504. [7] Chong, T. H., Suzuki, T., Aida, T., Fujio, H., “Bending stresses of internal spur gear”, Bulletin of JSME, Vol. 25, (1982), 679-686. [8] Oda, S., Miyachika, K., Araki, K., “Effects of rim thickness on root stress and bending fatigue strength of internal gear tooth”, Bulletin of JSME, Vol. 27, (1984), 1759-1764. [9] Chong, T. H., Kubo, A., “Simple stress formulae for a thin-rimmed spur gear. Part 3: Examination of the calculation method and stress state of internal spur gear”, Journal of Mechanisms Transmissions and Automation in Design, Vol. 107, (1985), 418-423. [10] Eiff, H. V., Hirschmann, K. H., Lechner, G., “Influence of gear tooth geometry on tooth stress of external and internal gears”, Journal of Mechanical Design, Vol. 112, (1990), 575-583. [11] Chong, T. H., Katayama, N., Kubo, A., Yabe, H., “Tooth fillet stresses of gear with thin rim 4th report: Approximation formulae for tooth fillet and rooth stresses of internal spur gear”, Bulletin of JSME, Vol. 27, (1984), 325-332. [12] Hidaka, T., Ishida, T., Uchida, F., “Effects of rim thickness and number of teeth on bending strength of internal gear”, Bulletin of JSME, Vol. 27, (1984), 617-623. [13] Andrews, J. D., “A finite element analysis of bending stresses induced in internal and external involute spur gears”, Journal of Strain Analysis, Vol. 26, (1982), 153-163. [14] Höhn, B. -R., Michaelis, K., “Influence of oil temperature on gear failures”, Tribology International, Vol. 37, (2004), 103-109. [15] Fernandes, P. J. L., McDuling, C., “Surface contact fatigue failures in gears”, Engineering Failure Analysis, Vol. 4 (2), (1997), 99-107. [16] Moorthy, V., Shaw, B. A., “Contact fatigue performance of helical gears with surface coatings”, Wear, Vol. 276-277, (2012), 130-140. [17] Olver, A. V., Tiew, L. K., Medina, S., Choo, J. W., “Direct observations of a micropit in an elastohydrodynamic contact”, Wear, Vol. 256, (2004), 168-175. [18] Archard, J. F., “Contact of rubbing flat surfaces”, Journal of Applied Physics, Vol. 24, (1953), 981-988. [19] Flodin, A., Andersson, S., “Simulation of mild wear in spur gears”, Wear, Vol. 207, (1997), 16-23. [20] Flodin, A., “Wear of spur and helical gears”, Royal Institute of Technology, Doctoral Thesis, Stockholm, (2000). [21] Pödra, P., Andersson, S., “Wear simulation with the Winkler surface model”, Wear, Vol. 207, (1997), 79-85. [22] Andersson, S., “Partial EHD theory and initial wear of gears”, Royal Institute of Technology, Stockholm, (1975), 1-37. [23] Flodin, A., Andersson, S., “Simulation of mild wear in helical gears”, Wear, Vol. 241, (2000), 123-128. [24] Flodin, A., Andersson, S., “A simplified model for wear prediction in helical gears”, Wear, Vol. 249, (2001), 285-292.[25] Yang, W., Li, H., Dengqiu, M., Yongqiao, W., Jian, C., “Sliding friction contact stiffness model of involute arc cylindrical gear based on fractal theory”, International Journal of Engineering, Vol. 30, (2017), 109-119. [26] Baragetti, S., “Fatigue resistance of steel and titanium PVD coated spur gears”, International Journal of Fatigue, Vol. 29, (2007), 1893-1903. [27] Azadi, M., Rouhaghdam, A. S., Ahangarani, S., “Effect of temperature and gas flux on the mechanical behavior of TiC coating by pulsed DC plasma enhanced chemical vapor deposition”, International Journal of Engineering, Vol. 27, (2014), 1243-1250. [28] Kumar, P. S., Manisekar, K., “Effect of composition on friction co-efficient of copper based Cu-Sn-MoS2 composites”, International Journal of Engineering, Vol. 28, (2015), 115-120. [29] Martins, R. C., Moura, P. S., Seabra, J. O., “MoS2/Ti low-friction coating for gears”, Tribology International, Vol. 39, (2006), 1686–1697. [30] Amaro, R. I., Martins, R. C., Seabra, J. O., Renevier, N. M., Teer, D. G., “Molybdenum disulphide/titanium low friction coating for gears application”, Tribology International, Vol. 38, (2005), 423–434. [31] Walton, D., Goodwin, A. J., “The wear of unlubricated metallic spur gears”, Wear, Vol. 222, (1998), 103-113. [32] Tunalıoğlu, M. Ş., Tuç, B., “Theoretical and experimental investigation of wear in internal gears”, Wear, Vol. 309, (2016), 208-215. [33] Deutsche norm, FZG-Zahnrad-Verspannungs-Prüfmaschine, DIN 51354, (1990).

Download PDF 

International Journal of Engineering
E-mail: office@ije.ir
Web Site: http://www.ije.ir