Lecture 9 Spur gear design NPTEL（讲座9 齿轮设计NPTEL）.pdf

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Lecture 9 Spur gear design NPTEL（讲座9 齿轮设计NPTEL）.pdf

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Lecture 9 Spur gear design NPTEL（讲座9 齿轮设计NPTEL）

Machine Design II Prof. K.Gopinath Prof. M.M.Mayuram Module 2- GEARS Lecture 9 - SPUR GEAR DESIGN Contents 9.1 Problem 1 Analysis 9.2 Problem 2 Spur gear 9.1 PROBLEM 1 – SPUR GEAR DESIGN In a conveyor system a step-down gear drive is used. The input pinion is made of 18 teeth, 2.5 mm module, 20o full depth teeth of hardness 330Bhn and runs at 1720 rpm. The driven gear is of hardness 280Bhn and runs with moderate shock at 860 rpm. Face width of wheels is 35 mm. The gears are supported on less rigid mountings, less accurate gears and contact across full face may be assumed. The ultimate tensile strength of pinion and gear materials is 420 and 385MPa respectively. The gears are made by hobbing process. Find the tooth bending strength of both wheels and the maximum power that can be transmitted by the drive with a factor of safety 1.5. The layout diagram is shown in the Fig 9.1. Fig 9.1 Conveyor drive layout Indian Institute of Technology Madras Machine Design II Prof. K.Gopinath Prof. M.M.Mayuram Solution: The bending fatigue stress is found from AGMA equation as,