w11-hw3-gear-motor - ME250 Design and Manufacturing I...

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ME250 Design and Manufacturing I Winter 2011 Lecture HW #3 Name: ___________________________ UMID: _________________ Lab Section #: _______ Note: You must indicate name, UMID, and Lab Section # otherwise the homework will not be returned.
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1. The figure below schematically illustrates the low speed configuration of the universal gear box for the semester project. Gears 2 and 3, gears 4 and 5, gears 6 and 7, and gears 8 and 9 are attached on the same shafts, respectively. [25pts] (a) The inverse of the gear speed ratio is called reduction ratio. Calculate the reduction ratio of the above gear train to the second decimal place. [10pts] (b) Using some of gears 1-10, design a gear train with reduction ratio = 4.54. Your gear train must use gear 1 as the input, gear 10 as the output, and cannot separately use the attached gears (gears 2 and 3, gears 4 and 5, gears 6 and 7, and gears 8 and 9). Also, gear 9 (worm) can only mesh with gear 10 (worm gear). Sketch your gear train and label each gear as in the above figure, and confirm that the reduction ratio is indeed 4.54. Consider only the combination of gears, and ignore the constraints on the
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This note was uploaded on 09/12/2011 for the course MECHENG 250 taught by Professor Stevis during the Winter '09 term at University of Michigan.

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w11-hw3-gear-motor - ME250 Design and Manufacturing I...

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