Life Analysis of Multiroller Planetary Traction Drive
Abstract
A 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. A study was performed to determine the effects of roller diameter and roller center location on life. It was found that an optimum life geometry exists.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1981
- Accession Number
- ADA097759
Entities
People
- Douglas A. Rohn
- John J. Coy
- Stuart H. Loewenthal
Organizations
- National Aeronautics and Space Administration