An isolator for isolating a device driven by an engine via an endless drive member is described. The isolator comprises a shaft adapter that is connectable with a shaft of the device, defining a shaft adapter axis, a rotary drive member that is rotatable relative to the shaft adapter and has an endless drive member engagement surface that is engageable with the endless drive member, and an isolation spring arrangement positioned to transfer torque between the shaft adapter and the rotary drive member. The isolation spring arrangement has at least one isolation spring that is axially offset from the endless drive member engagement surface. The at least one isolation spring has an outer edge that is radially outside the endless drive member engagement surface.

An additive-coated sheave assembly having a wheel with a groove in an outer circumferential surface of the wheel. The additive-coated sheave assembly can have an axle configured to support the wheel and a frame configured to receive and support the axle. A coating can be affixed to the groove by an additive manufacturing process. A method of manufacturing a sheave by coating the groove with a coating by an additive manufacturing process is also disclosed.

An additive-coated sheave assembly having a wheel with a groove in an outer circumferential surface of the wheel. The additive-coated sheave assembly can have an axle configured to support the wheel and a frame configured to receive and support the axle. A coating can be affixed to the groove by an additive manufacturing process. A method of manufacturing a sheave by coating the groove with a coating by an additive manufacturing process is also disclosed.

A power transmission apparatus includes a first pulley and a second pulley. A belt is extended around them. A supply unit supplies a voltage such that the first pulley and the belt are electrostatically attracted and that the second pulley and the belt are electrostatically attracted. The belt includes a conductor layer. At least one pulley includes a first electrode to which a first voltage is applied and a second electrode that is insulated from the first electrode and to which a second voltage is applied. An insulating layer or a dielectric layer is arranged between the conductor layer of the belt and the first electrode of the at least one pulley and an insulating layer or a dielectric layer is arranged between the conductor layer of the belt and the second electrode of the at least one pulley.

A power transmission apparatus includes a first pulley and a second pulley. A belt is extended around them. A supply unit supplies a voltage such that the first pulley and the belt are electrostatically attracted and that the second pulley and the belt are electrostatically attracted. The belt includes a conductor layer. At least one pulley includes a first electrode to which a first voltage is applied and a second electrode that is insulated from the first electrode and to which a second voltage is applied. An insulating layer or a dielectric layer is arranged between the conductor layer of the belt and the first electrode of the at least one pulley and an insulating layer or a dielectric layer is arranged between the conductor layer of the belt and the second electrode of the at least one pulley.

A filtering pulley for an accessory drive of an internal combustion engine, having a hub suitable for connection to an engine accessory, an annular crown provided with a profile configured to cooperate with a drive belt, a coil spring able to transmit torque between the crown and the hub, a first carrier constrained to a first end of the spring and a second carrier constrained to a second end of the spring. The annular crown is externally coaxial to the hub and supported in a rotationally free manner on the hub, and each of the carriers is rotationally coupled to both the hub and the crown with a limited possibility of relative rotation with respect to each of them.

A filtering pulley for an accessory drive of an internal combustion engine, having a hub suitable for connection to an engine accessory, an annular crown provided with a profile configured to cooperate with a drive belt, a coil spring able to transmit torque between the crown and the hub, a first carrier constrained to a first end of the spring and a second carrier constrained to a second end of the spring. The annular crown is externally coaxial to the hub and supported in a rotationally free manner on the hub, and each of the carriers is rotationally coupled to both the hub and the crown with a limited possibility of relative rotation with respect to each of them.

A high torque sprocket includes a body defining an outer periphery and a hub section defining an inner surface for engaging a bushing. A continuous toothed structure is disposed on the outer periphery of the body, and a textile reinforcement embedded in the body adjacent the inner surface of the hub section. The body is formed of a castable polymer material. In some cases, one or two optional flanges are disposed on side(s) of the body immediately adjacent the continuous toothed structure, in some aspects, a textile reinforcement may be embedded in a surface of the flange(s) immediately adjacent the continuous toothed structure. In some aspects, the high torque sprocket further includes a textile reinforcement embedded in the continuous toothed structure outer surface, and the textile reinforcement is selected from nylon, cotton, aramid, PTFE, and mixtures thereof.

Belt-driven systems, such as a front-end accessory drive for an internal-combustion engine, often include one or more idler pulleys. It is typical for these idler pulleys to be retained by a bolt or bolt and washer. To obviate the bolt and washer, a fastener-less system has a shaft with a circumferential groove and a bearing with an inner race that has a circumferential ridge. An idler pulley is mounted on the bearing. The ridge engages with the groove of the shaft to retain the idler pulley/bearing on the shaft. Additionally, either a key inserted into keyways or stakes are used to avoid relative rotation of the inner race of the bearing with respect to the shaft.

Belt-driven systems, such as a front-end accessory drive for an internal-combustion engine, often include one or more idler pulleys. It is typical for these idler pulleys to be retained by a bolt or bolt and washer. To obviate the bolt and washer, a fastener-less system has a shaft with a circumferential groove and a bearing with an inner race that has a circumferential ridge. An idler pulley is mounted on the bearing. The ridge engages with the groove of the shaft to retain the idler pulley/bearing on the shaft. Additionally, either a key inserted into keyways or stakes are used to avoid relative rotation of the inner race of the bearing with respect to the shaft.