Powered metal variator components
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United States of America Patent
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Dec 26, 2017
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app pub date -
Jul 3, 2014
filing date -
Jan 24, 2007
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Abstract
A variator having at least one roller which runs upon at least one race to transfer drive from one to the other at variable ratio. The variator has a fluid supply for supplying fluid to the race and roller thereby to provide a fluid film by which the roller and the race are separated in use. The roller has a running surface with root means square roughness Rq(roller) and the race having a root means square roughness Rq(race). The variator's specific film thickness is the minimum thickness of the fluid film in normal operation divided by the composite roughness, and is less than 1.0. At least one of the roller and the race has a powder metal surface with a Ra roughness above 0.1 micrometers.
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