Pulley with controlled surface irregularity for an internal...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 7/02 (2006.01) F02B 67/06 (2006.01) F16G 1/28 (2006.01) F16H 55/36 (2006.01) F16H 55/38 (2006.01)

Patent

CA 2267056

An accessory drive system for an internal combustion engine includes a multi-ribbed belt and pulley system. Shear generators are machined, formed or molded and extend axially from the driving pulley's faces such that the shear generators expand the drive belt in a plurality of regions. The shear generators are formed as either spheroids projecting into the V of the V-pulley such that the spheroids extend from two faces of adjacent grooves at approximately the midpoint between the root and apex of the V, or as shifted circumferential grooves of a multi-ribbed pulley having a continuous wave pattern. These shear generators cause a plurality of localized high tension regions at the highest pressure zone of the belt/pulley friction interface, improving circumferential friction, and therefore torque capacity, with minimal effect on belt wear due to their smoothness.

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