Innovative Design for A Ball Worm Gear Mechanism

Abstract

In this study, a new mechanism was designed and presented as an alternative to the worm gear mechanism without its disadvantages. This novel mechanism is referred to as a “ball worm gear mechanism”. The force of the worm gear mechanism is transmitted by a sliding movement, which leads to high operating temperature and low efficiency as well as wear on the bronze worm wheel. Therefore, a new mechanism was designed with balls placed into the helical grooves on the worm shaft which move by rolling on the worm wheel.  The worm wheel of the newly designed mechanism is made of case-hardened steel, which is less expensive than bronze. Thus, it is anticipated that not only the cost of the worm wheel will be reduced, but also its life will be extended. Greater efficiency and elimination of the high operating temperature are expected to result from the power transmission achieved by the rolling motion of the new mechanism. Modeling of the design was carried out with SolidWorks software and the feasibility of the mechanism was confirmed.

Keywords

• Worm gear mechanism,ball-screw mechanism,CAD,Efficiency

References

1. B. Salman, Sonsuz Vidalar ve Sonsuz Vida Karşılık Dişlisi Helisel Dişli Matematik Modellemesi, İstanbul Teknik Üniversitesi Fen bilimler Enstitüsü, İstanbul, 2009.
2. J. J. Uicker, G. R. Pennock, J. E. Shigley, Theory of Machines and Mechanisms, 3rd ed., Oxford University Press, New York, 2003.
3. P. W. Crosher, Design and Application of the Worm Gear, ASME Press, New York, 2002.
4. P. J. Kantert, Manual for Archimedean Screw Pump, Hirthammer Verlag, 2008.
5. T. Şekercioğlu, Makine Elemanları Hesap Şekillendirme, 1st ed. Birsen Yayınevi, 2013, pp.327.
6. F.C. Babalık, Makine Elemanları ve Konstrüksiyon Örnekleri, 3rd ed., Nobel Yayınevi, 2008.
7. ISO/TR 10828-1997, Worm Gears – Geometry of worm profiles, 1997.
8. D. Muhns, H. Wittel, D. Jannasch, J. Vobiek, Rolof / Matek Maschinenelemente, 19th, Vieweg Verlag, Wiesbaden, 2011.

9. S. Koçak, Bilyeli Sonsuz Vida Mekanizması Tasarımı ve İmalatı, Pamukkale Üniversitesi Fen bilimler Enstitüsü, Denizli, 2014.
10. M. Pak, Sonsuz Vidalı Redüktörlerin Bilgisayar Yardımıyla Parametrik Tasarımı, Sakarya Üniversitesi Fen bilimler Enstitüsü, Sakarya, 1998.
11. J.R. Colbourne, The use of oversize hobs to cut worm gears, American Gear Manufacturers Association, 1989, pp 89.
12. M. De Donno, F.L. Litvin, Computerized design and generation of worm gear drives with stable bearing contact and low transmission errors, ASME Journal of Mechanical Design, vol.121, No. 4, pp. 573–578, 1999.
13. D.B. Dooner, A.A. Seirig, The Kinematic Geometry of Gearing: a concurrent engineering approach, 3rd ed. John Wiley and Sons, New York, 1995.
14. H. S. Fang, C. B. Tsay, Mathematical model and bearing contacts of the zn-type worm gear set cut by oversize hob cutters, Mechanism and Machine Theory vol. 35, pp. 1689–1708, 2000.
15. S.A. Lagutin, Synthesis and application of general type worm gears with localized contact, Tech. Univ., Rektor, 1998.
16. F.L. Litvin, Development of gear technology and theory of gearing, NASA Reference Publication pp.1406-1500, 1998.
17. I.H. Seol, Design, generation and simulation of meshing of worm-gear drive with longitudinally localized contacts, ASME Journal of Mechanical Design vol.122, no.2, pp. 201–206, 2000.
18. V.V. Simon, Computer aided loaded tooth contact analysis in cylindrical worm gears, Journal of Mechanical Design vol.127, pp.973 – 981, 2005.
19. V.V. Simon, Influence of tooth errors and shaft misalignments on loaded tooth contact in cylindrical worm gears, Mechanism and Machine Theory vol.41, pp.707–724, 2006.
20. D.P. Townsend, Dudley’s Gear Handbook, 2nd ed., McGraw-Hill Inc., New York, 1992.
21. C. Zanzi, J.I. Pedrero, Application of modified geometry of face gear drive, Computer Methods in Applied Mechanics and Engineering, vol. 194, pp. 3047–3066, 2005.
22. Ball Screw. http://www.nsk.com/products/precision machine/ballscrew/index.html #tab2 (accessed 07.08.17).