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 which 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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