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Understanding Simple and Compound Gear Trains: Angular Velocity Ratios

In this lecture on mechanical design, we explore simple gear trains, focusing on calculating the angular velocity ratio, ( mv ), for different configurations, including idler gears that influence the overall ratio's sign. We delve into compound gear trains, which utilize multiple gears on a single shaft to achieve higher gear ratios exceeding 10:1. Through several practical examples, we highlight the necessary gear selection from catalogs based on the desired diametral pitch and gear teeth count. Enhance your understanding of gear systems with these critical design concepts.

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Understanding Simple and Compound Gear Trains: Angular Velocity Ratios

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  1. 22.322 Mechanical Design II Spring 2013

  2. Lecture 11 Simple Gear Trains • Let’s determine the angular velocity ratio, mv, for the gear train as shown: External mesh! • The gears N3, N4, N5 are called idlers. The idlers only affect the sign of the overall ratio. Having more than one idler does not make much sense.

  3. Lecture 11 Compound Gear Trains • To get a train ratio of greater than about 10:1, it is usually necessary to use a compound gear train. • A compound gear train is one in which at least one shaft carries more than one gear.

  4. Lecture 11 Compound Gear Trains

  5. Lecture 11 Example #1

  6. Lecture 11 Example #2

  7. Lecture 11 Example #2

  8. Lecture 11 Example #2 Of course we now would have to find the appropriate gears in a catalog that have the correct number of teeth for a given diametral pitch.

  9. Lecture 11 Example #3

  10. Lecture 11 Example #3

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