162A 5-1 - Gears and Gear Trains

162A 5-1 - Gears and Gear Trains - 162A. Introduction to...

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162A. Introduction to Mechanisms and Mechanical Systems Chapter 5 Part 1: Gears and Gear Trains
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What is a gear? s A gear is a part with teeth , which mesh with another toothed part in order to transmit torque. s At least two gears must exist for it to perform a useful function s Functions: b MA meaning to increase the output torque b To increase or reduce speed b To change the direction of motion b To change the location of motion
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Common Types of Toothed Gears s Straight spur gears s Helical spur gears erringbone gears s Herringbone gears s Plain bevel gears s Spiral bevel gears s Hypoid gears s Worm and wheel gears
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Gear Types s Internal or External s Direction of Teeth b Spur b Helical b Herringbone irection of Axes s Direction of Axes b Spur b Bevel and Hypoid b Worm and wheel b Rack and pinion s Tooth Profile b Involute (>99%) b Circular b Cycloid
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Spur and Helical Gears s Spur Gears – the teeth are parallel to the axis of rotation. They are used to transmit motion between parallel shaft s Advantages: simple, less expensive, widely used s Helical Gears-the teeth are inclined to the axis of rotation. The angle of inclination is
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This note was uploaded on 08/08/2011 for the course MAE 162A taught by Professor Glenn during the Spring '08 term at UCLA.

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162A 5-1 - Gears and Gear Trains - 162A. Introduction to...

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