Gear Geometry Analysis with Asymmetric Pressure Angle
Abstract
Gear design is one of the most critical components in the Mechanical Power Transmission industry. Among all the geardesign parameters pressure angle is the most critical parameter, which mainly affects the load carrying capacity of the gear.Generally gears are designed with a symmetric pressure angle for drive and coast side. It means that both flank side of gearare able to have same load carrying capacity. In some applications, such as in wind turbines, the gears experience only unidirectionalloading. In such cases, the geometry of the drive side need not be symmetric to the coast side. This allows forthe design of gears with asymmetric teeth. Therefore new gear designs are needed because of the increasing performancerequirements, such as high load capacity, high endurance, long life, and high speed. These gears provide flexibility todesigners due to their non-standard design. If they are correctly designed, they can make important contributions to theimprovement of designs in aerospace industry, automobile industry, and wind turbine industry.
In this paper we present a mathematical model of helical gear pair with an asymmetric pressure angle. We haveincreased the pressure angle of gear on the drive side to increase the load capacity and performance of the gear pair interms of noise and mesh stiffness while transmitting power. Also we have analyzed the results of bending and contactstresses generated on gear pair with the asymmetric pressure angle.
References
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[4]SagarJadhav Mahindra & Mahindra Ltd., Amit Sandooja Mahindra Engineering Services, “Analytical Approach to Gear Reverse Engineering (Spur and Helical)” SAE International, 2012-01-0812.
[5] Deng, G. and Nakanishi, T., “Bending Load capacity Enhancement using an Asymmetric Tooth Profile”
[6]Gunay, Durmus, Ozar, Halil and Aydemir, Alpay “The effect of Addendum Modification coefficient on Tooth Stresses of Spur Gear”
[7] ISO 6336 and DIN 3990 “Gear standard for tooth bending and Contact stress calculation”
[8] Dudley, Darle W. “Handbook of Practical Gear Design”
[9] Amit Sandooja, SagarJadhav, “Analysis of Gear geometry and Durability with Asymmetric Pressure angle” SAE, 2012-01 1995.
[10]ElvioBonisoli, Mauro Velardocchia, Sandro Moos, Stefano Tornincasa and Enrico GalvagnoPolitecnico di Torino, “Gearbox Design by means of Genetic Algorithm and CAD/CAE Methodologies” SAE, 2010-01-0895.
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