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FME Transactions
2020, vol. 48, iss. 1, pp. 31-45
article language: English
document type: unclassified
published on: 04/05/2020
doi: 10.5937/fmet2001031O
Creative Commons License 4.0
Design sizing of cylindrical worm gearsets
aTexas Southern University, Department of Industrial Technology Houston, Texas, USA
bNigerian Defence Academy, Mechanical Engineering Department, Kaduna, Nigeria



The authors gratefully acknowledge that this study was supported in parts with funds from the College of Science, Engineering, and Technology (COSET) Research Fund and the University Faculty Development Fund of Texas Southern University, Houston, Texas


A method for the design sizing task of cylindrical worm gearsets is presented that gives an estimate of the initial value of the normal module. Expressions are derived for the worm pitch diameter of integral and shell worms as well as for the active face width of the gear and the threaded length of the worm. An attempt is made to predict the contact strength of bronze materials against scoring resistance. Four Examples of design sizing tasks of cylindrical worm gears are carried out using the approach presented and the results are compared with previous solutions from other methods. The results for first three examples show excellent comparisons with previous solutions of American Gear Manufacturers Association (AGMA) method. The results of the fourth example are slightly more conservative than those of DIN3999 but are practically similar. Therefore, it appears that a systematic, reliable and more scientifically based method for cylindrical worm drive design sizing has been developed.



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