Abstract: A hollow cylindrical pulley body 5 is carried rotatably by a hollow cylindrical shaft member 11. A support rod 8 is inserted in the shaft member 11 to support the shaft member 11 for rocking motion about a pivot axis C2 orthogonal to the shaft member 11. The pivot axis C2 is inclined backward in the direction of belt travel with respect to the direction of load on the shaft member 11. With this configuration, when the drive belt 3 deviates to one side, the pulley body 5 is immediately angularly moved so that it is inclined with a level difference with respect to the direction of load on the shaft member 11 and is positioned obliquely relative to the drive belt 3, thereby producing a force of returning the drive belt 3 to its normal position.

Abstract: A hollow cylindrical pulley body 5 is carried rotatably by a hollow cylindrical shaft member 11. A support rod 8 is inserted in the shaft member 11, and the shaft member 11 is elastically supported to the support rod 8 through an elastic body 10. The elastic body 10 is provided within a quarter of the periphery of the support rod 8 that is located, when viewed along the axis of the shaft member 11, forward of the line of action of a radial shaft load on the shaft member 11 with respect to the direction of rotation of the pulley body 5. With this configuration, when the drive belt 3 deviates to one side, the pulley body 5 is immediately angularly moved so that it is inclined with a level difference with respect to the direction of the radial shaft load and is positioned obliquely relative to the drive belt 3. In this manner, a force of compensating for the deviation of the drive belt 3 is produced to avoid its wobbling.

Abstract: A pulley body 5 is provided at its both sides with power transmission members 6, 6. When a flat belt 3 becomes misaligned relative to the center of the pulley body 5 and comes into contact with one of the power transmission members 6, a running force of the flat belt 3 is utilized to displace the pulley body 5 diagonally relative to the flat belt 3, thus producing a force for returning the flat belt 3 to its original state.

Abstract: A hollow cylindrical pulley body 5 is carried rotatably by a hollow cylindrical shaft member 11. A support rod 8 is inserted in the shaft member 11 to support the shaft member 11 for rocking motion about a pivot axis C2 orthogonal to the shaft member 11. The pivot axis C2 is inclined backward in the direction of belt travel with respect to the direction of load on the shaft member 11. With this configuration, when the drive belt 3 deviates to one side, the pulley body 5 is immediately angularly moved so that it is inclined with a level difference with respect to the direction of load on the shaft member 11 and is positioned obliquely relative to the drive belt 3, thereby producing a force of returning the drive belt 3 to its normal position.

Abstract: A hollow cylindrical pulley body 5 is carried rotatably by a hollow cylindrical shaft member 11. A support rod 8 is inserted in the shaft member 11, and the shaft member 11 is elastically supported to the support rod 8 through an elastic body 10. The elastic body 10 is provided within a quarter of the periphery of the support rod 8 that is located, when viewed along the axis of the shaft member 11, forward of the line of action of a radial shaft load on the shaft member 11 with respect to the direction of rotation of the pulley body 5. With this configuration, when the drive belt 3 deviates to one side, the pulley body 5 is immediately angularly moved so that it is inclined with a level difference with respect to the direction of the radial shaft load and is positioned obliquely relative to the drive belt 3. In this manner, a force of compensating for the deviation of the drive belt 3 is produced to avoid its wobbling.

Abstract: A pulley body 5 is provided at its both sides with power transmission members 6, 6. When a flat belt 3 becomes misaligned relative to the center of the pulley body 5 and comes into contact with one of the power transmission members 6, a running force of the flat belt 3 is utilized to displace the pulley body 5 diagonally relative to the flat belt 3, thus producing a force for returning the flat belt 3 to its original state.

Abstract: A belt-type one-way clutch is arranged so that a case is assembled with a flat pulley so as to rotate around the central axis of the flat pulley, and that a flat belt is looped between a working surface of a rocking member supported for rocking motion by a shaft member held at both ends in shaft bores of the case and a working surface of the flat pulley, and that the rocking plate biased from a leaf spring presses one span of the flat belt to place an initial tension on the flat belt. Both the ends of the shaft member are held in the shaft bores of the case via respective bushes to suppress stress. Accordingly, larger torque can be transmitted despite use of aluminum alloy as material of the case.

Abstract: A belt-type one-way clutch is arranged so that a case is assembled with a flat pulley so as to rotate around the central axis of the flat pulley, and that a flat belt is looped between a working surface of a rocking member supported for rocking motion by a shaft member held at both ends in shaft bores of the case and a working surface of the flat pulley, and that the rocking plate biased from a leaf spring presses one span of the flat belt to place an initial tension on the flat belt. In this one-way clutch, both the ends of the shaft member are held in the shaft bores of the case via respective bushes that cover the corresponding side surfaces of both the ends of the shaft member, which suppresses stress produced due to concentration of load thrown by the shaft member. Accordingly, larger torque can be transmitted while constraints placed due to use of aluminum alloy as material of the case for its weight reduction can be avoided.

Abstract: A pulley with a built-in one-way clutch, the type of which has sprags tilting in a direction to wedge between inner and outer rings while being guided on respective riding lands of a cage by pressing of respective leaf springs, is mounted on an alternator shaft of an alternator to which torque of a crank shaft of a vehicle engine rotating together with slight variations in angular velocity is transmitted through a power transmission belt. In the mounting, a tilting force acting on a contact point at which each sprag contacts the corresponding riding land to tilt the sprag in the wedging direction is set larger than a frictional force between the sprag and the riding land acting on the contact point. According to this setting, the sprag can be tilted in the wedging direction regardless of the frictional force between the sprag and the riding land, thereby eliminating a locking failure within the high engine speed range.

Abstract: In an infinitely variable speed transmission T of this invention, a belt variable speed mechanism 4 is arranged between a first rotatable shaft 1 and a second rotatable shaft 2. A planetary gear mechanism 81 is provided which comprises a first, a second, and a third element. The first element is drivingly coupled to the second rotatable shaft 2. The second and third elements are drivingly coupled by way of different power transmission lines to the first rotatable shaft 1. An enclosed gear housing space 78 is defined at the back of a fixed sheave 14 of a second variable speed pulley 13 of the belt variable speed mechanism 4, to house therein the planetary gear mechanism 81. A belt transmission mechanism 55 is arranged between the first and second rotatable shafts 1 and 2. Supported on a flange 82 integral with the second rotatable shaft 2 is a planetary gear 84 having a first gear part 85 that engages with a first sun gear 88 and a second gear part 86 that engages with a second sun gear 90.