Abstract: A method for manufacturing a poly-V pulley includes a process for slitting and compressing the peripheral edge portion of an essentially flat blank for forming a widened and thickened flange wall. A series of relatively narrow, deep, V-shaped grooves are cold rolled. The poly-V pulley thus produced has the flange wall with poly-V grooves, from the intermediate portion of which a web extends radially inward. This structure provides good dynamic balance of rotation for the pulley and thus prolongs the life not only of the pulleys per se but also the belt to be put around the pulley. Further, the manufacturing method allows the manufacture of relatively small diameter poly-V pulleys.

Abstract: A flat disc 1 having a central aperture is deformed on its periphery by spin-forming the metal of the disc so that the metal projects from each side of the plane of the disc and thereby forms a cylindrical rim 6 which is parallel to the axis of the disc. One or a plurality of series of V-grooves 8 are then formed on the outer surface of the rim. The metal is spin-formed in such manner as to cause it to be laterally extruded thereby forming a rim which has a definite thickness independent of the thickness of the initial disc constituting the web of the pulley.

Abstract: An inner surface of a cylindrical flange wall of a poly-V pulley is provided with a plurality of ribs in the longitudinal or axial direction of the cylindrical flange wall for strengthing the cylindrical flange wall.

Abstract: A method of manufacturing precise sheet metal made poly-V pulleys with poly-V grooves, being uniform in thickness of peripheral wall and free of reduction of mechanical strength, by a step of preliminarily forming a lug in the peripheral wall of a cup-shaped blank and thickening the peripheral wall, a step of forming a plurality of V-grooves in a multiple arrangement on this thickened peripheral wall by pressing from both sides with a V-groove preliminary forming roller possessing a plurality of V-grooves forming ridges and a rotary inner die possessing a plurality of V-grooves while rotating the cup-shaped blank, and a step of pressing this peripheral wall with a plurality of V-grooves with a finishing roller. Furthermore, a method of manufacturing sheet metal made poly-V pulleys having advanced precision, by a step of preliminarily forming lugs and first grooves in the peripheral wall of a cup-shaped blank, and a step of thickening the peripheral wall.

Abstract: A sheet steel poly-V-grooved pulley having a special cross-sectional contour is made optionally by any one of three different cold working manufacturing procedures. Special physical properties or characteristics are developed in the pulley by the manner in which the metal in the V-groove body and single and double walled terminal flanges are cold worked. The cold working involves forming in stages of manufacturing from a cup-shaped blank to the finished pulley product a stepped inner body wall surface equivalent to a tapered surface with improved substantially uniform torque transmitting strength in the grooved body from web wall to open end. Also involved in the cold working is an increase in pulley diameter in certain portions of the finished pulley and a decrease in diameter in other portions from the diameter of the side wall of the cup shaped starting blank.

Abstract: A pulley, composite in nature, including a fabricated wheel defining a rim channel into which a ring is positioned. The ring is rigidly held within the channel by tabs and interlocking arrangements. The ring is designed to include any one of a number of pulley gripping surfaces such as teeth and V grooves.

Abstract: A belt-pulley drive mechanism comprising a pulley having a plurality of circumferentially extending grooves of V-shaped cross-sectional configuration, a belt adapted to be passed around the pulley and stretched under tension so that the belt is engaged with the pulley in torque transmitting relationship, the belt being formed with a plurality of longitudinally extending ridges of V-shaped cross-sectional configuration which are adapted to be engaged with the grooves in the pulley when the tension is applied to the belt. The grooves or the ridges or both are formed in a cross-section along a concave line so that a clearance is formed between the pulley and the belt when the tension is removed from the belt, the clearance being larger at a transversely central portion than at side edge portions.

Abstract: A pulley has a planar end wall and an annular wall extending axially outwardly therefrom. The annular wall is formed with belt receiving grooves and the end wall is formed with a central opening for mounting the pulley on a hub or shaft. A stamped sheet metal washer having a generally annular configuration is formed with a central hole and an integral projection extending radially outwardly from the outer edge of the washer. The washer is firmly attached to the end wall of the pulley preferably by welding or by bonding with an acrylic structural adhesive with the central hole of the washer being concentric to the central opening of the end wall. The projection is positioned to counterbalance any unbalance in the annular wall that may have developed therein during forming of the pulley.

Abstract: A sheet metal poly-V pulley formed from a cup-shaped blank having a cylindrical wall with inner and outer peripheral surfaces, the pulley comprising: at least a portion of the cylindrical wall being thickened with material from the blank, the thickened portion having a plurality of parallel V-shape annular grooves in the outer peripheral surface, separated by parallel, annular partition walls, the alternating annular grooves and partition walls being adapted for receiving poly-V belts; the inner peripheral surface of the thickened portion having a plurality of small V-shape annular grooves arranged parallel to one another and centrally aligned with the partition walls of the outer peripheral surface; and, annular flanges at opposite ends of the thickened portion projecting radially beyond the partition walls, the flanges having stepped, annular cut-out portions to prevent contact between the pulley and lateral edges of poly-V belts.

Abstract: A composite plastic and metal pulley intended primarily for use with an endless drive belt for vehicle accessories, particularly an alternator. The pulley is formed by a hollow cylindrical-shaped molded plastic member having a series of outwardly opening V-shaped belt-receiving grooves on the outer surface thereof. A flat disc-shaped metal member is mounted within the central bore of the plastic member perpendicular to the longitudinal axis thereof. The outer edge of the metal disc is scalloped and is embedded firmly within the plastic to prevent rotation of the disc with respect to the plastic member. A central opening is formed in the disc for mounting the pulley on the extended end of the alternator shaft.

Abstract: A composite pulley construction intended primarily for use with the endless drive belt for vehicle accessories. The pulley is formed of a sheet metal body and has a multi-V-groove belt-receiving formation molded of plastic on an outer cylindrical wall portion of the metal body. The plastic belt-receiving formation has a series of inverted V-shaped projections forming outwardly opening V-shaped grooves located between adjacent pairs of the V-shaped projections and between a pair of outer, spaced belt-retaining annular projections also formed of plastic. The belt-retaining projections extend radially outwardly beyond the crests of the V-shaped groove-forming projections a predetermined distance and reduce sideways movement of the belt with respect to the intervening V-grooves. The outer surface of the cylindrical wall portion preferably is knurled to enhance the bonding of the plastic to the metal surface.

Abstract: A pulley and method of making same are provided wherein such pulley has a plurality of annular grooves for receiving a power transmission belt which has a corresponding plurality of belt elements. The pulley comprises a pair of side flanges, each having a belt element supporting side wall and at least one annular rib between the flanges. Such rib has belt element supporting side walls and side flanges which are separate substantially identical parts that are interchangeable on the pulley from side to side. The rib is disposed in sandwiched relation between the side flanges, with the flanges and rib being fastened together to define a pulley.

Abstract: An electromagnetic clutch including a pulley which is rotated by an external power source through a belt or belts for selectively transmitting the rotation of the pulley to a drive shaft by electromagnetically attracting a magnetic armature supported on the drive shaft. The pulley has a magnetic annular body rotatably supported and a belt-receiving groove member of aluminum alloy formed onto the outer surface of the magnetic annular body by die casting and integrated with the magnetic annular body. The construction improves the weight, cost and simplifies the method of production of the pulley without degrading the performance and balance of the pulley.

Abstract: This invention relates to a novel method of making pulleys and pulley blanks from sheet metal. The sheet metal is stamped into pulley blanks having an upstanding cylindrical wall, the cylindrical wall is then thickened by being partially collapsed axially, followed by contacting with a roller. The roller can have a plurality of v-shaped grooves on its surface, to form a pulley for use with a poly-v belt.