Performance of a Nasvytis Multiroller Traction Drive
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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Tests were conducted to determine the operational and performance characteristics of a high-speed, 14.7-to-1 fixed-ratio Nasvytis Multiroller Traction Drive at speeds to 73 000 rpm and power levels to 127 kW 170 hp. The test drive was arranged in a single-stage, planetary configuration with two rows of stepped planet rollers contained between concentric sun and ring rollers. It was lubricated with a traction fluid. Two drives were tested concurrently in a back-to-back arrangement. They exhibited good performance and operated smoothly, with a nominal peak efficiency of 95 percent. Variations of the design traction coefficient imposed by the automatic roller-loading device of 0.039, 0.048, and 0.057 seemed to have relatively little effect on any of the operating variables.
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