RESEARCH PAPERS: Power Transmission and Gearing

Constrained Fatigue Life Optimization of a Nasvytis Multiroller Traction Drive

[+] Author and Article Information
J. J. Coy

Propulsion Laboratory, AVRADCOM Research and Technology Laboratories, Lewis Research Center, Cleveland, Ohio

D. A. Rohn, S. H. Loewenthal

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

J. Mech. Des 103(2), 423-428 (Apr 01, 1981) (6 pages) doi:10.1115/1.3254927 History: Received February 01, 1980; Online November 17, 2009


A contact fatigue life analysis method for multiroller traction drives is presented. The method is based on the Lundberg-Palmgren analysis method for rolling element bearing life prediction, and also uses life adjustment factors for materials, processing, lubrication, and effect of traction. The analysis method is applied in an optimization study to the multiroller traction drive, consisting of a single-stage planetary configuration with two rows of stepped planet rollers of five rollers per row. The drive was approximately 25 centimeters in diameter by 11 centimeters long, having a nominal ratio of 15:1. The theoretically predicted drive life was 2510 hours at a nominal continuous power and speed of 74.6 kW (100 hp) and 75,000 rpm.

Copyright © 1981 by ASME
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