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RESEARCH PAPERS: Power Transmission and Gearing Papers

Efficiency of Nonstandard and High Contact Ratio Involute Spur Gears

[+] Author and Article Information
N. E. Anderson

Propulsion Laboratory, AVSCOM Research and Technology Laboratories, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

S. H. Loewenthal

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135

J. Mech., Trans., and Automation 108(1), 119-126 (Mar 01, 1986) (8 pages) doi:10.1115/1.3260774 History: Received July 10, 1984; Online November 19, 2009

Abstract

A power loss prediction method previously developed by the authors was extended to include involute spur gears of nonstandard proportions. The method can now be used to analyze the effects of modified addendum, tooth thickness, and gear center distance in addition to the parameters previously considered which included gear diameter, pitch, pressure angle, face width, oil viscosity, speed, and torque. Particular emphasis is placed on high contact ratio gearing (contact ratios greater than two). Despite their higher sliding velocities, high contact ratio gears can be designed to levels of efficiency approaching those of conventional gears while retaining their advantages through proper selection of gear geometry.

Copyright © 1986 by ASME
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