Numerical analysis on bending and contact stress of single and double start worm drive. (2021)

• Record Type: Journal Article
• Authors: Mohanraj, R.; Elangovan, S.; Kesava Chandran, V.; Mohamed Sulaiman, M.F.; Harsha Pradhaa, R.; Poojasri, S.; Ramakrishna, J.R.
• Is Part Of: Materials today. Volume 46:Part 17(2021)
• Page Start: 8038
• Page End: 8044
• Publication Date: 2021
• Subjects: Worm drive -- Finite element analysis -- Single and double start -- Contact stress -- Bending stress; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2021.02.788
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Worm drives are used for non-parallel transmission of power with reduced noise and vibrations. The proper functioning of a worm drive design depends on number of factors that are to be studied extensively and understood for effective optimization and would help in obtaining a positive relationship between the design parameters and other operating parameters. In this paper, the distribution of bending and contact stress was obtained for a worm wheel design by varying the number of starts and the friction coefficient through Finite Element Analysis (FEA). The worm and worm wheel is modelled for the process parameters obtained from the design considerations and simulation was carried out in ANSYS to determine the stress distribution. The results highlight the development of a higher bending and contact stress distribution for a worm and worm wheel with double start in comparison to a single start worm drive. The bending stress for single and double starts was found to be in a close agreement with the numerically obtained value from Lewis equation, with a maximum observable error of 5%. The present work further highlights the compromise of bending and contact stresses in return for a better efficiency that is inherent in a multiple start worm drive compared to a single start.