Multi v-grooved pulley structure and method of making same

Details Multi v-grooved pulley structure and method of making same Multi v-grooved pulley structure and method of making same

F - Mech Eng,Light,Heat,Weapons

16

H

74/244, 113/65

F16H 55/49 (2006.01) B21D 53/26 (2006.01)

Patent

CA 1067314

ABSTRACT OF THE DISCLOSURE A one-piece, sheet metal multi V-grooved pulley has a circular hub wall integrally connected with a cylindrical side wall, which side wall terminates in an open end opposite of the hub wall. A series of outwardly opening V-shaped grooves is formed by pairs of V-shaped flange walls in the cylindrical side wall. The pairs of flange walls decrease in metal thickness progressively from the hub wall toward the open end. The V-grooved pulley is made by forming a cup-shaped stage blank having a bottom hub flange wall and a connected outer cylindrical wall terminating in an open end. The stage blank is formed by roller spinning an outer annular portion of a sheet metal disc along a stepped cylindrical surface of a headstock die. A series of integrally connected cylindrical surfaces is formed along the interior of the cylindrical wall of the stage blank by the roller spinning operation. The metal thickness of the cylin- drical cup wall sections defined by the stepped surfaces decrease in a step-like fashion progressing from the hub flange wall to- ward the open end. A series of V-shaped grooves then is cold rolled in the cylindrical wall by inwardly displacing the center of each of the stepped cylindrical wall sections to provide pairs of V-flanges which form the V-shaped grooves. Each cylindrical wall section of the series provides the metal for the pair of V-flanges which forms the V-shaped grooves, whereby the metal thickness of the V-flange pairs decrease progressing toward the open end of the pulley.

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