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http://dx.doi.org/10.3795/KSME-A.2012.36.9.1027

Strength Analyses of New 2- and 3-Axis-Type Small Multiplying Gears in Dental Hand-Pieces  

Kim, Cheol (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.)
Kim, Ju-Yeong (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.)
Lee, Jung-Ho (Saeshin Precision Co., Technology Center)
Kwak, Se-Ho (Saeshin Precision Co., Technology Center)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.9, 2012 , pp. 1027-1032 More about this Journal
Abstract
Two types of very small multiplying gears and arrays have been developed for new dental hand-pieces, and the increased speed ratios, modules, number of teeth, gear diameters, and gear types were calculated based on the dynamics of the machinery. The contacting and bending strengths were evaluated for gear teeth with two design concepts using AGMA equations and finite element analyses, and the contacting stresses on teeth with and without DLC (diamond-like-carbon) coating layers were calculated. Fatigue and tension tests were performed to obtain an S-N curve, the Young's modulus, and the strength of the gear material, and these were utilized in the analyses. Slightly larger stresses were found for 2-axis-type gears than for other types of gears, and the S-N curves showed that a gear lifetime of 109 cycles was satisfied. The contacting stresses in gears coated with DLC were reduced by 30%. A new prototype model of a hand-piece with small gears was successfully fabricated and tested.
Keywords
Handpiece; Multiplying Gears; Contact Stress; Fatigue Life;
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  • Reference
1 Han, M., Kim, J., Choi, M., Lee, W. and Kim, H., 2008, "Development of Ultra High Speed Dental Handpiece," Proceedings of 2008 The korean Society of Manufacturing Technology Engineers Spring Conference, pp. 68-72.
2 Ugural, A. C., 2004, Mechanical Design, McGraw Hill, pp. 424-498.
3 AGMA, 2001, AGMA 2001-B88
4 Mercer, C., Evans, A. G., Yao, N., Allameh, S. and Cooper, C. V., 2003, "Material Removal on Lubricated Steel Gear with W-DLC-Coated Surfaces" Surface and Coatings Technology, Vol. 173, pp. 122-129.   DOI   ScienceOn
5 Luo, J. F., Liu, Y. J. and Berger, E. J., 2000, "Interfacial Stress Analysis for Multi-Coating Systems Using Advanced Boundary Element Method," Computational Mechanics, Vol. 24, pp. 448-455.   DOI