friction drive

noun Automotive.
a power transmission system utilizing a set of friction gears so arranged that varying their positions relative to one another gives a wide range of speed ratios.

Origin:
1905–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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The screen wheel is driven by a friction drive wheel powered by an electric motor or a water-driven turbine or paddle wheel.
No clutch or friction drive mechanism is allowed, and parts are to be kept to a minimum.
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