January 2026
Intermediate
900 pages
23h 23m
English
Content preview from Machine Design, 2nd Edition by Pearson
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CHAPTER 25
Gears
Chapter Objectives
- Discuss the working principle of gears.
- Choose gear materials with respect to the service conditions.
- Design gears by taking into account effective tooth load, contact stress and surface durability.
25-1 INTRODUCTION
Toothed wheels or gears are used to overcome problems of slippage in belt and rope drives so as to produce positive drive with uniform angular velocity ratio. Motion of a pair of gears is analogous to that of a pair of two-pitch cylinders, which roll without slip. Action on the meshing teeth consists of a combination of rolling and sliding motion. A unique property of two teeth in mesh is that “the common normal to the curves of the two teeth in contact at their point of contact must pass ...
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