Abstract: A pulley is provided with first and second disks each having an outer surface and an inner surface, and a center hole with a center axis. Each disk has a hub formed at its center hole that extends outwardly from the disk outer surface. The inner side of each disk has a drive surface and a connection surface extending around its respective center hole. The connection surface is perpendicular to the center axis and the drive surface is angled relative to the connection surface to form the outer surface of each disk with a generally concave shape. The connection surfaces of the first and second disks are abutted and secured together using a fastening mechanism. The disks are arranged where the drive surfaces form an annular groove around the hubs and the hubs of each disk are aligned concentrically with the groove.

Abstract: A hub for a pulley, gear, or wheel is formed with an integral key or other integral means for preventing relative rotation and with an integral stop for positioning the hub axially on a shaft. The hub has a generally cylindrical opening for a shaft, an integral key extending inwardly into the shaft opening along at least part of the shaft opening for engaging a keyway in the shaft, and an integral mechanical stop covering at least a portion of one end of the shaft opening. The integral key preferably extends the entire length of the shaft opening. The mechanical stop preferably has an opening which is disposed at least around one end of the integral key. The mechanical stop serves to position the pulley, gear, or wheel precisely with respect to the end of a shaft when the pulley, gear, or wheel is assembled onto the shaft. The keyed hub is manufactured by powder metallurgy. One or more body plates are welded to the formed hub to form a pulley, gear, or wheel, or the hub is pressed into a body plate.

Abstract: A pulley is constructed from a pair of identical pulley halves, each having a central opening with a series of notches extending therefrom. A hub member extends through the pulley half openings, and outwardly deformed rings are formed in a side wall of the hub member to sandwich portions of the pulley halves thererbetween adjacent the openings in the pulley halves. The rings are formed in a bulging process. The rings deflect inwardly into the notches, to prevent the pulley halves from rotating relative to each other when the pulley halves are assembled together.