Conical pulley

one of a pair of belt pulleys, each in the shape of a truncated cone, for varying velocities.

See also: Pulley

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The company's continuously variable transmission (CVT) technology is different from the normal gear-shift procedure in that a chain passes over two conical pulleys and the distance between these can be adjusted using hydraulic control.