![]() ![]() The formulae for bending-strength rating are based on cantilever-projection theory. They have also been improved with modifications in the new standards to consider load sharing between adjacent teeth, the load increment due to external and internal dynamic loads, uneven distribution of load over the facewidth due to mesh misalignment caused by inaccuracies in manufacture, and elastic deformations, etc. The actual cylindrical gear-tooth rating formulae for pitting resistance are based on Hertz’s results for the calculation of contact pressure between two curved surfaces. ![]() Formulas are based on the AGMA Standard 2105-D04 for calculation of the load capacity of cylindrical gears. ![]() The procedure takes into account the pitting resistance (surface fatigue failure) and bending strength capacity (volumetric fatigue failure) of spur and helical gears. In this presentation, the procedure and formulas to estimate a value of gear life expectancy for a high number of cycles is given. In this sense, AGMA Standard 2105-D04 has introduced useful information to consider the fatigue load capacity of steel gears in the case of a high number of cycles. The actual practice of engineering and increase of the work speeds in current applications of gears has required better specification of steel fatigue behavior for numbers of cycles greater than 106 or 107. Because of this, effective procedures and information to evaluate the load capacity and useful life of gears are needed by specialists in several fields of engineering application, including those involved with disaster preparedness and management in the fields of transportation, power generation, and the mechanical industry. Fatigue failure of gears can lead to the catastrophic failure of equipment, taking into account that gears are important elements in the power transmission systems of many modern machines. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |