Investigation of Increased Load Capacity of Spur and Helical Gears with Increased Contact Ratio
Final rept. 25 Apr 1969-26 Oct 1970
BOEING VERTOL CO PHILADELPHIA PA
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The purpose of this project was to investigate the relative load- carrying capabilities of spur and helical gears with increased-profile contact ratio greater than 2 by carrying out a program of experimental investigation to assess the influence of increased load sharing among teeth on load capacity. This report presents the results of an experimental program to substantiate load intensity and load sharing of a particular high-profile contact ratio greater than 2 spur and helical 1-to-1 speed-ratio gear design. Baseline test gear geometry with a minimum-profile contact ratio of 1.30 was chosen to be consistent with present aircraft design practice to permit comparison with the high-contact-ratio gear geometry which had a minimum-profile contact ratio of 2. 10. A strain-gage survey was conducted on 9.0-pitch spur and helical gears to ascertain the load-sharing characteristics of the high-profile contact ratio tooth geometry and to provide information for deriving equations to determine the load intensity at any point of contact.
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