Abstract
This chapter highlights the types, materials, and performance of gear. External spur gears are cylindrical gears with straight teeth cut parallel to the axes; tooth load produces no axial thrust. It gives excellent results at moderate peripheral speeds and has tendency to be noisy at high speeds. Shafts rotate in opposite directions. Straight bevel gears are used to connect two shafts on intersecting axes; shaft angle equals the angle between the two axes containing the meshing gear teeth. Gear teeth are radial toward apex; end thrust is developed under tooth load tending to separate the gears. Internal spur gears provide compact drive for transmitting motion between parallel shafts rotating in same direction. To help in securing a quiet running of spur, helical, straight, and spiral bevel gears fabric-reinforced resin materials can be used. Other plastic materials are also available and information on their allowable stresses should be obtained from the material supplier. A number of methods for estimating the expected performance of gears have been published as standards. These use a large number of factors to allow for operational and geometric effects for the matching of the design to suit a particular application.
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