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Life analysis of multiroller planetary traction driveA contact fatigue life analysis was performed for a constant ratio, Nasvytis Multiroller Traction Drive. The analysis was based on the Lundberg-Palmgren method for rolling element bearing life prediction. Life adjustment factors for materials, processing, lubrication and traction were included. The 14.7 to 1 ratio drive consisted of a single stage planetary configuration with two rows of stepped planet rollers of five rollers per row, having a roller cluster diameter of approximately 0.21 m, a width of 0.06 m and a weight of 9 kg. Drive system 10 percent life ranged from 18,800 hours at 16.6 kW (22.2 hp) and 25,000 rpm sun roller speed, to 305 hours at maximum operating conditions of 149 kw (200 hp) and 75,000 rpm sun roller speed. The effect of roller diameter and roller center location on life were determined. It was found that an optimum life geometry exists.
Document ID
19810011894
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Coy, J. J. (Army Aviation Research and Development Command Cleveland, Ohio, United States)
Rohn, D. A. (NASA Lewis Research Center Cleveland, OH, United States)
Loewenthal, S. H. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
April 1, 1981
Subject Category
Mechanical Engineering
Report/Patent Number
E-484
NASA-TP-1710
AVRADCOM-TR-80-C-16
Accession Number
81N20423
Funding Number(s)
PROJECT: RTOP 505-32-42
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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