Effect of Contact Ratio on Spur Gear Dynamic Load With No Tooth Profile Modifications

[+] Author and Article Information
Chuen-Huei Liou, Hsiang Hsi Lin

Department of Mechanical Engineering, The University of Memphis, Memphis, TN

F. B. Oswald, D. P. Townsend

NASA Lewis Research Center, Cleveland, OH

J. Mech. Des 118(3), 439-443 (Sep 01, 1996) (5 pages) doi:10.1115/1.2826905 History: Received March 01, 1995; Revised February 01, 1996; Online December 11, 2007


This paper presents a computer simulation showing how the gear contact ratio affects the dynamic load on a spur gear transmission. The contact ratio can be affected by the tooth addendum, the pressure angle, the tooth size (diametral pitch), and the center distance. The analysis presented in this paper was performed by using the NASA gear dynamics code DANST. In the analysis, the contact ratio was varied over the range 1.20 to 2.40 by changing the length of the tooth addendum. In order to simplify the analysis, other parameters related to contact ratio were held constant. The contact ratio was found to have a significant influence on gear dynamics. Over a wide range of operating speeds, a contact ratio close to 2.0 minimized dynamic load. For low-contact-ratio gears (contact ratio less than two), increasing the contact ratio reduced gear dynamic load. For high-contact-ratio gears (contact ratio equal to or greater than 2.0), the selection of contact ratio should take into consideration the intended operating speeds. In general, high-contact-ratio gears minimized dynamic load better than low-contact-ratio gears.

Copyright © 1996 by The American Society of Mechanical Engineers
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