Abstract
This paper examines the tooth failure in spur gears. Corrective measures are taken to avoid tooth damage by introducing profile modification in root fillet. In general, spur gear with less than 17 numbers of teeth had the problem of undercutting during gear manufacturing process which minimizes the strength of gear at root. In this study, a novel design method, namely circular root fillet instead of the standard trochoidal root fillet is introduced in spur gear and analyzed using ANSYS version 11.0 software. The strength of these modified teeth is studied in comparison with the standard design. The analysis demonstrates that the novel design exhibit higher bending strength over the standard trochoidal root fillet gear. The result reveals that the circular root fillet design is particularly suitable for lesser number of teeth in pinion and where as the trochoidal root fillet gear is more opt for higher number of teeth.
Highlights
The objective of the gear drive is to transmit power with comparatively smaller dimensions, runs reasonably free of noise and vibration with least manufacturing and maintenance cost
The analysis demonstrates that the novel design exhibit higher bending strength over the standard trochoidal root fillet gear
Looking in to bending stress the 15T gear generated with circular root fillet have lesser stress (609.654 N/ mm2) at 1000 rpm when compared with trochoidal fillet gear (626.699 N/mm2)
Summary
The objective of the gear drive is to transmit power with comparatively smaller dimensions, runs reasonably free of noise and vibration with least manufacturing and maintenance cost. In gear manufacturing process the tooth root fillet is generated as the tip of the cutter removes material from the involute profile resulting teeth that have less thickness at root. This reduces the tooth strength and leads to the crack initiation and propagation at root fillet area. To improve the gear tooth strength many works have been done but all mostly employed positive profile shifting [10,11,12,13] These contributions exhibit lower pitting and scoring resistance with lesser contact ratio resulting in more noise and vibration during the power transmission [14]
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