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Design of asymmetric normal contact ratio spur gear drive through direct design to enhance the load carrying capacity.pdf

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Design of asymmetric normal contact ratio spur gear drive through direct design to enhance the load carrying capacity.pdf

Mechanism and Machine Theory 95 (2016) 22–34 Contents lists available at ScienceDirect Mechanism and Machine Theory journal homepage: /locate/mechmt Design of asymmetric normal contact ratio spur gear drive through direct design to enhance the load carrying capacity P. Marimuthu, G. Muthuveerappan ? Machine Design Section, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 36, India article info Article history: Received 21 February 2015 Received in revised form 7 July 2015 Accepted 19 August 2015 Available online 5 September 2015 Keywords: Asymmetric spur gear Fillet stress Contact stress Direct design Load sharing ratio Non-dimensional stresses abstract Maximum ?llet and contact stresses of asymmetric normal contact ratio spur gears designed by direct design method are evaluated based on the load sharing ratio, using ?nite element method. For a direct gear design, area of existence diagrams are developed for known input gear parameters such as number of teeth, coef?cient of asymmetry, top land thickness coef?cient and drive side contact ratio. A unique Ansys parametric design language code is developed to ?nd the load sharing ratio, maximum ?llet and contact stresses. The ?llet stress is calculated in terms of non-dimensional stress. The in?uence of gear drive parameters such as drive and coast side pressure angles, top-land thickness coef?cients, contact ratio, coef?cient of asymmetry, gear ratio and teeth number on load carrying capacity has been studied extensively on non-dimensional ?llet stress and maximum contact stress and compared with that of the conventionally designed gears. Through parametric study, suitable suggestions are made for the design of asymmetric gear drive for an enhanced load carrying capacity with constant contact ratio and constant drive side pressure angle separately. ? 2015 Elsevier Ltd. All rights reserved. 1. Introduction Conventional gear design is done based on a standard rack cutter, whereas in a