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Investigation of load carrying capacity of asymmetric high contact ratio spur gear based on load sharing using direct gear design approach.pdf
Mechanism and Machine Theory 96 (2016) 52–74
Contents lists available at ScienceDirect
Mechanism and Machine Theory
journal homepage: /locate/mechmt
Investigation of load carrying capacity of asymmetric high contact ratio spur gear based on load sharing using direct gear design approach
P. Marimuthu, G. Muthuveerappan ?
Machine Design Section, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 36, India
article info
Article history: Received 17 February 2015 Received in revised form 30 June 2015 Accepted 30 September 2015 Available online 23 October 2015
Keywords: Asymmetric spur gear Direct gear design High contact ratio Load sharing ratio Non-dimensional stress
abstract
The Direct Gear Design? approach is one of the many gear designing methods available to improve load carrying capacity of the gear pairs. For customized gear pairs, the direct gear design approach is more advantageous over conventional design. In this paper, a parametric study is carried out for asymmetric high contact ratio spur gears based on load sharing method to determine the improvement in load carrying capacity. A ?nite element model for multi-pair contact is adopted to determine the non-dimensional ?llet and contact stresses which quantify the load carrying capacity of the gear pairs. The results of direct designed symmetric and asymmetric high contact ratio spur gears are compared with the conventional symmetric high contact ratio spur gears. Also, the in?uence of gear parameters such as addendum pressure angle, gear ratio, teeth number and backup ratio of non-dimensional stresses is analyzed in detail. The results show signi?cant improvement in gear pair performance for all parameters analyzed.
? 2015 Elsevier Ltd. All rights reserved.
1. Introduction
In general, the load carrying capacity of gear drives is affected by the ?llet and contact strength of the gear tooth [1]. The insuf?cient ?llet strength leads to tooth fracture whereas; the insuf?cient cont
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