CHAPTER 26
Helical Gears
Chapter Objectives
Describe the various parameters of a helical gear.
Design a helical gear after taking into account the virtual number of teeth, the tooth load and the different strengths.
26-1 INTRODUCTION
Motion through helical gears can be transmitted between parallel shafts, non-parallel shafts, and nonintersecting shafts. A pair of parallel helical gears is used on parallel shaft and crossed helical gears are used on non-parallel shafts. For the generation of a spur-gear tooth, a plane rolls on a base circle, and the edge of the plane is a straight line parallel to the axis of the cylinder, when this plane rolls or unwraps from the cylinder edge and a point on edge traces an involute. In the case of helical ...
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