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Epicyclic Gear Train Experiment

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UNIVERSITI TUNKU ABDUL RAHMAN
Faculty Course : : Engineering & Science Bachelor of Engineering (Hons) Mechanical Engineering Year 3/ Semester 1 Unit Code Unit Title : : UEME3133 Mechanics of Machines

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Experiment 1 : Epicyclic Gear Train
1. Objectives • • • • • • • To understand the working principle of epicyclic gear system. To calculate gear ratio of the epicyclic gear system. To determine the input power and output power of the epicyclic gear system. To determine the power loss of the epicyclic gear system. To measure the different stage epicyclic gear systems speed output. To measure the output torque generated by the epicyclic gear system. To calculate epicyclic gear system efficiency.

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The three basic components of the epicyclic gear are: • • • Sun - The central gear. Planet carrier - Holds one or more peripheral planet gears, same size, meshed with the sun gear. Annulus - An outer ring with inward-facing teeth that mesh with the planet gear or gears.

planet gear sun gear planet gear carrier Figure 2 Figure 2 shows the carrier is held stationary while the sun gear is used as input. The planet gears turn in a ratio determined by the number of teeth in each gear. Here, the ratio is -24/16, or -3/2; each planet gear turns at 3/2 the rate of the sun gear, in the opposite direction. In many epicyclic gearing systems, one of these three basic components is held stationary; one of the two remaining components is an input, providing power to the system, while the last component is an output, receiving power from the system. The ratio of input rotation to output rotation is dependent upon the number of teeth in each gear, and upon which component is held stationary. One situation is when the planetary carrier is held stationary, and the sun gear is used as input. In this case, the planetary gears simply rotate about their own axes at a rate determined by the number of teeth in each gear. If the sun gear has S teeth, and each planet gear has P teeth, then the ratio is equal to -S/P. For instance, if the sun gear has 24 teeth, and each planet has 16 teeth, then the ratio is -24/16, or -3/2; this means that one clockwise turn of the sun gear produces 1.5

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