An uncoupling pulley provided with a longitudinal axis includes a wheel rim including a first area, intended for receiving a belt connecting the wheel rim to a first power-transmission element, and a second area extending from the first area; a hub rigidly connected to a second power-transmission element; one of the power-transmission elements being driving and the other being driven; a ring gear including a first portion located under the second area and a second portion presented in the shape of at least one cylindrical skirt extending, from the first portion, along said longitudinal axis, the ring gear being capable of rotating relative to the wheel rim and/or the hub about the longitudinal axis; a device for driving the ring gear by the wheel rim; a resiliently deformable element, one end of which is attached to the hub and another end of which is attached to the ring gear; the cylindrical skirt being located opposite the resiliently deformable element, so that the resiliently deformable element can engage with the cylindrical skirt in said first relative direction of rotation.

A belt pulley decoupler includes a belt pulley, a hub to be fixed on the shaft, and a series connection made up of a decoupler spring and a wrap-around band arranged in the drive torque flow between the belt pulley and the hub. The wrap-around band extends about direction of the axis of rotation of the belt pulley decoupler and is arranged radially between the belt pulley and the decoupler spring. Under transmission of the drive torque, both ends of the wrap-around band widen radially, with one end of the wrap-around band being braced against the inner surface of a first sleeve that is rotationally fixed in the belt pulley, and another end being braced against the inner surface of a second sleeve that is rotatable within the belt pulley.

Torsional vibration dampers (TVDs) having a plurality of spokes designed to withstand both torsional and bending forces and vibrations are disclosed. The spokes, which connect a central member to a peripheral rim, include a first end coupled to an outer radial surface of the central member; a second end coupled to an inner radial surface of the rim; and four concave surfaces extending between the first end and the second end. The concave surfaces may be concave from the first end to the second end and may also be concave laterally from front to back or side to side. A TVD having a hub with spokes having one or more concave surfaces is also disclosed herein. A method of designing the spokes for the hub is also disclosed.

The disclosed invention is a novel method for constructing a LSTSD that simultaneously yields the following advantages over conventional designs: (1) the elastomer is not mold-bonded to the two metallic extremities; (2) the amount of elastomer is relatively smaller compared to conventionally constructed devices; (3) the device only allows the torsional direction to be spring loaded; (4) there is some damping inherently present in the system; (5) the device does not disintegrate on failure of the elastomeric element; and (6) the device is serviceable in the field without disengaging from the rotating shaft. Such a LSTSD when used in a TVI or a TVA would reduce its cost while improving its structural and modal integrity and enabling its serviceability in the field.

A one-way overrunning alternator clutch includes a shaft that includes a flange disposed at a first end of the shaft. The one-way overrunning alternator clutch also includes an axle extending from a first side of the flange to a second end of the shaft and a spring set that engages the flange of the shaft. The shaft includes a first spring, a second spring, and a third spring. The one-way overrunning alternator clutch also includes a first retainer engaging the spring set, and a pulley that includes an inner bore that receives the shaft, the spring set, and the retainer.

A decoupler having an input member, an output member and a combination one-way clutch and torsional isolator that couples the input and output members. The combination one-way clutch and torsional isolator includes a single helical coil spring. The decoupler being designed to provide torsional damping through a range of torque transmitted through the decoupler, the range including a maximum rate torque for the decoupler.

The pulley structure includes a ventilation path that is formed at a position shifted in a radial direction from a rotating axis of a first rotating body and allows a spring accommodation space, formed between the first rotating body and a second rotating body, and the outside to communicate with each other. At least a part of the ventilation path is formed in an end cap that blocks an opening portion on one side of the first rotating body in a rotating axis direction. The end cap blocks the opening portion of the first rotating body such that the spring accommodation space does not communicate with the outside toward the one side in the rotating axis direction other than the ventilation path.

Torsional vibration dampers are disclosed that have a hub defining a plurality of fastener-receiving openings and an inertia member concentric about and spaced a radial distance apart from a shaft-receiving member of the hub and having a plurality of receptacles defining a bore oriented axially. Each receptacle aligns with one of the plurality of fastener-receiving openings, and receives one of a plurality of elastomeric rings with a fastener seated therein and received in the fastener-receiving openings to operatively connect the inertia member to the hub through compression of the elastomeric rings. The height of each elastomeric ring is greater than the axial width of the receptacles, and compression of the elastomeric rings deforms each radially into a first gap between the hub and the inertia member and a second gap between the inertia member and the fastener, thereby axially locking the inertia member to the hub for rotation together.

A damper pulley for a crankshaft may include: a hub including a first cylindrical portion, a first closed end provided at one end of the first cylindrical portion, and a first open end provided at the other end of the first cylindrical portion; and a pulley including a second cylindrical portion having a plurality of grooves, a second closed end provided at one end of the second cylindrical portion, and a second open end provided at the other end of the second cylindrical portion. In particular, the first closed end of the hub and the second closed end of the pulley are combined into one unit.

In an aspect, a decoupler includes a hub, a pulley, a torsion spring, a first spring driver fixed to the pulley, and having a first stop feature for the spring; a second spring driver mounted about the hub and not fixed to the pulley, and having a second stop feature for the spring, a driving clutch shaft mounted connected to the second spring driver, a driven clutch shaft mounted concentrically with the driving clutch shaft and drivingly connected to the hub, a one-way wrap spring clutch mounted about the hub and disposed to interconnect the driving and driven clutch shafts, and configured to transfer torque in a first direction between the driving and driven clutch shafts, and an axial biasing member acting between one of (i) the pulley and the driving clutch shaft and (ii) the hub and driven clutch shaft, to urge the driving and driven clutch shafts together.