Effect Of Change Of Contact Ratio On Contact Fatigue Stress Of Spur Gears

The present research work dealt on the effect of change of contact ratio on the contact fatigue stressesrngenerated on meshing spur gear teeth during power transmission. In the study different cases of sixrncontact ratio gearing between 1.6 and 2.0 have been analyzed. For the different contact ratiosrnconsidered the rate of load sharing and angular and radial position of load were determined on therninvolute profile of meshing tooth of each gearing. In addition to that the different stress conditions of thisrntooth for critical position (at the instant when the generated contact stress is at the maximum state) arerndetermined. To come up at the result CATIA and Solid Works software involute spur gear models havernbeen applied for stress analysis on ANSYS Workbench (FEM). From this study it is clear that, the higherrncontact ratio resulted in the higher generated tooth fatigue contact stresses life (i.e. the highest loadrncarrying capacity). This is because of the decrease in value, and the change in location and direction ofrnload applied on tooth involute in mesh to transmit power. At last the results obtained from ANSYS WB arerncompared with results of the AGMA gear formula results. They are comparable to each other.

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