Project2Example1

# Project2Example1 - North Carolina State University...

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North Carolina State University Mechanical and Aerospace Engineering Department MAE 415-003 Design Project 2: Drivetrain Design Due: 11/15/01 We hereby pledge that we have neither given nor received any unauthorized assistance on this assignment. Jon Noel _________________________ Yanti Muljono _________________________ August Melchior _________________________ Jeff Mocock _________________________ Bobby Owen _________________________

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Abstract: The objective of this project is to compare the planetary gear train (Appendix, Figure 1) to the given nutating system (Appendix, Figure 2), and determine if the planetary design is feasible. There are several factors that must be considered when trying to verify whether or not a gear train is feasible. These factors include such things as pitch diameters, rated horsepower, torque, and number of gear teeth. By implementing the specifications from the given nutating system it was possible to complete all calculations needed to decide upon the feasibility of the planetary design. A conclusion was made that the planetary gear train is not feasible based on the amount of force that is applied on each gear. Therefore, it is recommended that the nutating system be utilized in cordless screwdriver transmission design. Drivetrain Design Mae 415-003 2
Introduction: The given task is to analyze the planetary gear train shown (Appendix, Figure 1), and compare it to the given nutating system (Appendix, Figure 2). Both designs are speed reducers intended for use in a cordless screwdriver. To enhance the reader’s understanding of a cordless screwdriver drivetrain, a typical design (Figure A) will be explained briefly. Many questions arise from the given situation. Can anything learned from the system in Figure A be applied to the given planetary system? Will those factors prove whether or not the given planetary system is feasible? How do those factors compare to the nutating system? All of these questions will be answered in the following report in order to decide whether or not the planetary system in is feasible. Drivetrain Design Mae 415-003 3

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Explanation of Typical Screwdriver Drivetrain: The gear assembly in Figure A consists of an input sun gear, a second sun gear, an output shaft, and two sets of three planetary gears all captured by a ring gear. During operation the ring gear remains fixed, allowing the planetary gear sets to act as speed reducers. Typically, each planetary gear set provides a 9:1 speed reduction ratio resulting in a total speed reduction of 81:1. One drawback of this particular design occurs because the input torque transmits relatively high forces to the point where the second planetary gear set contacts the ring gear. Generally, the contact ratio for the spur gears is 1:1.
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## This note was uploaded on 08/01/2008 for the course MAE 415 taught by Professor Eischen during the Fall '07 term at N.C. State.

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Project2Example1 - North Carolina State University...

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