IJRME – Volume 4 Issue 4 Paper 4


Author’s Name :  Jillepalli Naresh Babu

Volume 04 Issue 04  Year 2017  ISSN No:  2349-3860  Page no: 17-19



Spur mesh Gear is one of the most important critical components in a mechanical power transmission system, and most industrial Dynamic machinery. Spur gears teeth in action are generally subjected to two types of Dynamic cyclic stresses are: bending stresses inducing bending fatigue and contact stress causing contact fatigue. Both these types of Dynamic stresses may not attain their maximum values at the same point of contact fatigue. Recently worm & worm wheel in gear box of Winch machine for lifting sand buckets of approximate weight of 270 kg & at height 27 feet. The motor used to drive the worm has power of 3 Hp & speed of 1440 rpm. The speed reduction is 62:1. In working condition of gear box, worm wheel fails due to load coming on the teeth. The crack is initiated at central thickness of tooth. Hence the tooth breaks at the central thickness. The failure occurs once within operational period of about 16 days. So the industry has to replace the worm wheel which is not cost effective. Calculation of stresses of worm wheel at tooth thickness is a 3D problem. This paper represents the analysis of stresses using theoretical, experimental and FEM analysis. Experimentally obtained results are verified with the finite element analysis (FEA) results.


Worm Gear, Photo Elastictiy, Polariscope, Stress Freezing, FEA


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