Abstract
Publisher Summary There are several different types of gears that are used in the industry. Many are complex in design and manufacture and several have evolved directly from the spur gear, referred to as the basic gear. The types of gears are spur, helical, bevel, and worm. With few exceptions, gears are one-directional power transmission devices. Unless a special, bidirectional gear set is specified, gears have a specific direction of rotation and will not provide smooth, trouble-free power transmission when the direction is reversed. The primary performance criteria for gear sets include efficiency, brake horsepower, speed transients, startup, backlash, and ratios. Two primary operating parameters govern effective operation of gear sets or gearboxes: maximum torsional power rating and transitional torsional requirements. Installation guidelines provided in the vendor's operations and maintenance (O&M) manual should be followed for proper installation of the gearbox housing and alignment to its mating machine-train components.
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