IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1792-1799   

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M. Safak Tunalioglu, B. Tuc and M. Emin Erdin
( Received: June 09, 2017 – Accepted in Revised Form: September 08, 2017 )

Abstract    Theoretical and experimental investigation of wear during coupling in internal gears coated with various polymeric coating materials was performed in this study. In the theoretical part of the study, Archards’ wear formulation was adapted to internal gears and wear behavior in various 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, namely 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. Variation of wear depth on tooth profiles of internal gears were determined theoretically and experimentally. [ah1] Theoretical and experimental studies showed that polymeric coated internal gears have more wear resistance than uncoated ones by means of high lubrication ability and low friction coefficient of coating materials. It was also observed that high corrosion resistance of polymeric coatings protected metallic surfaces and decreased corrosive wear.



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


چکیده    در این مطالعه، بررسی تئوری و تجربی سایش در هنگام درگیری چرخ­دنده­های داخلی پوشانده شده با مواد پوشش پلی­مری مختلف انجام شد. در بخش نظری مطالعه، از فرمول سایش آرچرز برای چرخ­دنده­های داخلی استفاده و رفتار سایش در شرایط مختلف تعیین شد. علاوه بر این، یک دستگاه تست خستگی و سابش مشابه با روش کار FZG (Forschungsstelle für Zahnrader und Getreibbau) سیستم گردش قدرت مداربسته چرخ­دنده­های داخلی طراحی و ساخته شد. به منظور آزمایش سایش در چرخ­دنده­های داخلی. زوج دنده­ای داخلی ساخته شده از ماده­ی St50 با مواد پلی­مری مختلف، از جمله PTFE (polytetrafluoroethylene)، MoS2 با پلی آمید، MoS2 پیوند شده با اپوکسی در مطالعه تجربی پوشش داده شد. برای شناسایی عملکرد چرخ­دنده­های پوشش داده شده، یک چرخ­دنده داخلی بدون پوشش نیز بررسی شد. مطالعات نظری و تجربی نشان می­دهد که چرخ­دنده­های داخلی پلی­مری پوشش داده شده به خاطراستفاده از قابلیت روان­کاری بالا و ضریب اصطکاک کم مواد پوشش مقاومت بیشتری نسبت به چرخ­دنده­های بدون پوشش دارند. همچنین مشاهده شد که مقاومت در برابر خوردگی بالای پوشش­های پلی­مری موجب محافظت سطوح فلزی و کاهش خوردگی می­شود.


1.      Chen, Z. and 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.      TERAUCHI, Y., NAGAMURA, K. and IKEJO, K., "Study on friction loss of internal gear drives: Intluence of pinion surface finishing, gear speed and torque", JSME International Journal. Ser. 3, Vibration, Control Engineering, Engineering for Industry,  Vol. 34, No. 1, (1991), 106-113.

3.      Mansfield, A., "Teeth of internal gears", Journal of the Franklin Institute,  Vol. 103, No. 1, (1877), 17-20.

4.      Tong, B. and Walton, D., "A computer design aid for internal spur and helical gears", International Journal of Machine Tools and Manufacture,  Vol. 27, No. 4, (1987), 479-489.

5.      Tong, B. and Walton, D., "The optimisation of internal gears", International Journal of Machine Tools and Manufacture,  Vol. 27, No. 4, (1987), 491-504.

6.      Karpat, F., Engin, B., Dogan, O., Yuce, C. and Yilmaz, T., "Effects of rim thickness on tooth root stress and mesh stiffness of internal gears", in International Mechanical Engineering Congress & Exposition IMECE2014, Montreal, Canada, November., (2014), 13-20.

7.      Oda, S., Miyachika, K. and Araki, K., "Effects of rim thickness on root stress and bending fatigue strength of internal gear tooth", Bulletin of JSME,  Vol. 27, No. 230, (1984), 1759-1764.

8.      Chong, T.H. and Kubo, A., "Simple stress formulae for a thin-rimmed spur gear. Part 1: Derivation of approximation formulae for tooth fillet and root stresses", Journal of Mechanisms, Transmissions, and Automation in Design,  Vol. 107, No. 3, (1985), 406-411.

9.      Sánchez, M.B., Pleguezuelos, M. and Pedrero, J.I., "Calculation of tooth bending strength and surface durability of internal spur gear drives", Mechanism and Machine Theory,  Vol. 95, (2016), 102-113.

10.    Yang, S.-C., "Study on an internal gear with asymmetric involute teeth", Mechanism and Machine Theory,  Vol. 42, No. 8, (2007), 977-994.

11.    Ge, N. and Zhang, J., "Finite element analysis of internal gear in high-speed planetary gear units", Transactions of Tianjin University,  Vol. 14, No. 1, (2008), 11-15.

12.    Kahraman, A. and Vijayakar, S., "Effect of internal gear flexibility on the quasi-static behavior of a planetary gear set", Journal of Mechanical Design,  Vol. 123, No. 3, (2001), 408-415.

13.    Höhn, B.-R. and Michaelis, K., "Influence of oil temperature on gear failures", Tribology International,  Vol. 37, No. 2, (2004), 103-109.

14.    Fernandes, P. and McDuling, C., "Surface contact fatigue failures in gears", Engineering Failure Analysis,  Vol. 4, No. 2, (1997), 99-107.

15.    Moorthy, V. and Shaw, B., "Contact fatigue performance of helical gears with surface coatings", Wear,  Vol. 276, (2012), 130-140.

16.    Olver, A., Tiew, L., Medina, S. and Choo, J., "Direct observations of a micropit in an elastohydrodynamic contact", Wear,  Vol. 256, No. 1, (2004), 168-175.

17.    Archard, J., "Contact and rubbing of flat surfaces", Journal of applied physics,  Vol. 24, No. 8, (1953), 981-988.

18.    Flodin, A. and Andersson, S., "Simulation of mild wear in spur gears", Wear,  Vol. 207, No. 1, (1997), 16-23.

19.    Flodin, A., "Wear of spur and helical gears", Maskinkonstruktion,  (2000),

20.    Põdra, P. and Andersson, S., "Wear simulation with the winkler surface model", Wear,  Vol. 207, No. 1, (1997), 79-85.

21.    Andersson, S., "Partial ehd theory and initial wear of gears", Institutionen för Maskinelement,  (1975),

22.    Flodin, A. and Andersson, S., "Simulation of mild wear in helical gears", Wear,  Vol. 241, No. 2, (2000), 123-128.

23.    Flodin, A. and Andersson, S., "A simplified model for wear prediction in helical gears", Wear,  Vol. 249, No. 3, (2001), 285-292.

24.    Yang, W., Li, H., Dengqiu, M., Yongqiao, W. and Jian, C., "Sliding friction contact stiffness model of involute arc cylindrical gear based on fractal theory", International Journal of Engineering TRANSACTIONS A: Basics,  Vol. 30, No. 1, (2017), 109-119.

25.    Baragetti, S., "Fatigue resistance of steel and titanium pvd coated spur gears", International Journal of Fatigue,  Vol. 29, No. 9, (2007), 1893-1903.

26.    Azadia, M., Rouhaghdam, A.S. and 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-Transactions B: Applications,  Vol. 27, No. 8, (2013), 1243.

27.    Kumar, P.S. and Manisekar, K., "Effect of composition on friction co efficient of copper based cu-sn-mos2 composites", International Journal of Engineering-Transactions A: Basics,  Vol. 28, No. 1, (2014), 115-122.

28.    Martins, R., Moura, P.S. and Seabra, J., "MoS2/Ti low-friction coating for gears", Tribology International,  Vol. 39, No. 12, (2006), 1686-1697.

29.    Amaro, R., Martins, R., Seabra, J., Renevier, N. and Teer, D., "Molybdenum disulphide/titanium low friction coating for gears application", Tribology International,  Vol. 38, No. 4, (2005), 423-434.

30.    Walton, D. and Goodwin, A., "The wear of unlubricated metallic spur gears", Wear,  Vol. 222, No. 2, (1998), 103-113.

31.    Tunalioğlu, M.Ş. and Tuç, B., "Theoretical and experimental investigation of wear in internal gears", Wear,  Vol. 309, No. 1, (2014), 208-215.

32.    " Deutsche norm, FZG-zahnrad-verspannungs-prüfmaschine, din 51354",  Vol., No., (1990).

33.             Cavdar, K., Karpat, F. and Babalik, F.C., "Computer aided analysis of bending strength of involute spur gears with asymmetric profile", Journal of Mechanical Design,  Vol. 127, No. 3, (2005), 477-484.

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