Title: Method for manufacturing a unit piece of a V pulley

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Abstract: A method for manufacturing a unit piece for a `V` pulley of the type in which a pair of unit pieces of the same configuration are assembled in back-to-back relation to each other into a single complete pulley, said unit piece having a central flat portion and a circumferential `V` groove forming portion continuous with the flat portion, characterized by the steps of preparing a forging stock of a disk form of which the outer diameter is equal to the outer diameter D.sub.1 of said pulley unit peice and the thickness is equal to the thickness T of the flat portion of said pulley unit piece; and cold-forging said forging stock for deforming an outer circumferential portion thereof so that the thickness of the portion is gradually reduced radially outwardly to define a cylindrical portion of height L as well as an outermost circumference of thickness T.sub.1 and n innermost circumference of thickness T.sub.2 (T.sub.1 <T.sub.2) to form said circumferential V groove forming portion whereby the pulley unit piece is formed in such an efficient manner that the material of the forging stock of disk form is effectively plastic-deformed into the unit piece.


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