Abstract: Construction is achieved by which it is possible definitely prevent the occurrence of creep between a pulley 2b and an outer ring 7f. Trapezoidal shaped concave sections are formed such that the angle of intersection ? between the inside surfaces 23 on both sides of each concave section 17a of knurling 19a of the outer ring 7f is within the range 45°???120°. Moreover, the depth h in the radial direction of the concave sections 17a and the diameter D of the circumscribed circle of the tip end surfaces 22 of the convex sections 18a are regulated so as to satisfy the relationship 0.004 D?h?0.015 D, and the length L in the circumferential direction of the bottom surface 21 of the concave sections 17a is regulated within the range 0.01 D?L?0.03 D.

Abstract: A continuously variable V-belt transmission basically has a driving pulley, a driven pulley and a V-belt wound around the pulleys. The frictional engagement between the pulleys and the V-belt is controlled by regulating pulley axial thrusts to the pulleys. The V-belt has a plurality of torque transmitting connected by an annular ring. A boundary-detection arrangement is provided to detect a boundary position between a first region, in which the elements are arranged without any gap therebetween, and a second region, in which the elements are arranged with a gap therebetween, along a portion of the driving pulley when torque is being transmitted. The detected boundary position is used to estimate the pulley axial thrust applied by the driving pulley against the V-belt, and to control the pulley axial thrust to a lower limit which ensures that the V-belt will not slip upon application of the maximum torque.

Abstract: A rotatable shaft and pulley arrangement (1) has a tube (2) made of a suitable metal and having ends with knurled outside peripheries (3) onto which pulleys (5, 8) are press fit and laser welded for balanced low-weight attachment. A keyway (9) is stamped into a central portion of the tube to minimize weight imbalance and cost. An attachment wall (10) as preferably a ring groove is rolled into the tube to provide a circumferential attachment base for a fastener head (13) having a fastener shaft (15) that is threaded into an engine shaft for attachment of the tube to the engine shaft.

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: In order to subject a cellulosic material such as insulating paper onto and into which transformer high-voltage insulating oil containing PCB has adhered and permeated to washing that removes the PCB etc. to an undetectable value, the cellulosic material to which PCB etc. has adhered is placed in DMI, sulfolane or other aprotic solvent containing an alkali such as caustic soda and stirred.

Abstract: A magnetic-tape-cassette apparatus provides a pulley (1, 21, 22) for a belt drive, particularly to a flywheel for a deck of the magnetic-tape-cassette apparatus. The pulley has a groove (10) at its circumferential edge (6, 7), in which groove a drive belt (11, 27) is engageable to drive the pulley. In order to manufacture such a pulley simply and cheaply, the pulley comprises a central disc (2) and a first (3) and a second (4) end disc. The first and the second end disc are shaped along their circumferences in such a manner that they form the groove in which the drive belt is engageable.

Abstract: A method and construction of forming a pulley wheel mounted on a shaft. The pulley includes a pair of identical discs fused back to back by laser welding forming a pulley wheel with a peripheral groove and axial central opening. The pulley wheel is mounted on the shaft having a serrated or toothed exterior surface.

Abstract: A pulley device having a V-groove is formed by friction welding a pair of stamped steel plates together. A metal plate having a melting temperature lower than the steel plates is placed between the plates to melt-bond therewith by friction welding.

Abstract: To lower the cost and weight of a belt pulley and permit its installation without the use of large numbers of spacer discs, the belt pulley is composed of two substantially identical stamped sheet metal halves which are so configured as to define a hub region when assembled. One or both of the pulley halves may be provided with a radially inwardly extending nose which engages a key-way in the shaft on which it is mounted, thereby preventing relative rotation of pulley and shaft.