A belt pulley decoupler is provided which is to be arranged on a crankshaft of an internal combustion engine and has a hub provided for coupling to the crankshaft, and a connecting flange of which a distal face is in abutment with the hub in order to transmit torque from the hub to a belt pulley. The connecting flange having a geometry to facilitate a form fit for torque transmission both on the distal face and also on a proximal face which is intended to come into contact with a torsional vibration damper.

A torsional coupling including parts that all work together. Torque is applied to the inner member. The first stage (low torque) consists of a bonded part (rubber, inner and outer member) that is in series with a set of compression style coil springs. The torsional stiffness of the bonded part is approximately 25% of the resulting torsion stiffness provided by the coil springs. The second stage (high torque) the tangs on the inner member engage with a sprocket plate which locks out the first stage and transfers all torque through the coil springs. The coil springs are held in place by a unique geometry on the sprocket plate and the spring holders. The spring holders also prevent metal to metal contact between the coil springs and the upper and lower housing portions. Surface effect damping occurs at very high torques when the rubber molded around the tangs on the inner member rub on the bumps on the lower housing portion. A thrust bearing is used to react axial forces and to eliminate any metal to metal contact.

A belt pulley decoupler for a motor vehicle drive train, having a hub, a traction pulley having a traction-means receiving contour and being accommodated to rotate about an axis of rotation relative to the hub. The decoupler may include a plurality of bow springs supporting the traction pulley relative to the hub in a direction of rotation, at least one first bow spring being arranged offset in an axial direction and/or a radial direction of the axis of rotation to a second bow spring acting parallel to the first bow spring, and a vibration damping device conjointly connected by means of a carrier to the hub and accommodated on a sleeve-like receiving region of the carrier. The receiving region of the carrier projecting in the axial direction, at least partially, beyond the torque transfer region of the traction pulley.

A pulley structure includes a cylindrical outer rotation body, an inner rotation body, and a pair of bearings which is disposed between the outer rotation body and the inner rotation body. Of the pair of bearings, one bearing is a sliding bearing, and the other bearing is a rolling bearing. The sliding bearing is made of a thermoplastic resin and is formed into an ended ring shape. A thickness of the sliding bearing at each of both circumferential end portions is smaller than a reference dimension of a thickness of the sliding bearing.

In an aspect a device for a driven shaft is provided that receives an input torque that varies cyclically between a peak input torque and a low input torque at a peak input torque frequency, which includes a shaft adapter, a rotary drive member, at least one isolation member, a torsional vibration damping structure including an inertia member and a elastomeric damping member, and a supplemental damping structure. The supplemental damping structure applies a supplemental damping torque to resist relative movement between the rotary drive member and the inertia member in addition to damping provided by the elastomeric damping member. A sum of torques including the supplemental damping torque limits a maximum twist between a first end of the driven shaft and a second end of the driven shaft, to below a yield point of the driven shaft.

A belt pulley decoupler for the drive torque transmission between a belt of a starter-generator belt drive and the starter generator is provided. A hub is fastened on a generator shaft of the starter generator. A decoupler spring is configured to transmit drive torque of the belt from the belt pulley to the hub when the starter generator is powered. A rotary stop has a stop part on the belt pulley and a stop part on the hub. The rotary stop is configured to transmit drive torque of the generator shaft from the hub to the belt pulley when the starter generator is driving the belt. The decoupler spring is loaded in both torque directions and participates in the transmission of the drive torque from the hub to the belt pulley when the starter generator is driving the belt.

A rubber composition for a torsional damper has (A) a minimum value of tan δ at −30° C. to 120° C. of 0.140 or more, (B) a ratio of tan δ at −30° C. to tan δ at 60° C. of 3.5 or less, and (C) a ratio of E′ at −30° C. to E′ at 60° C. of 21 or less.

A belt pulley decoupler (1) for an auxiliary assembly drive (2) includes an input part (3) comprising a hub (4); and an output part (5) comprising a belt pulley (6). The output part (5) and the input part (3) can rotate about a common axis of rotation (7). The belt pulley decoupler further includes a first flange (8) having a first toothing (30), with the first flange (8) being connected to the hub (4) by means of a toothing (9); and a second flange (31) having a second toothing (32), with the second toothing (32) being connected to a third toothing (33) formed by the toothing (9) on the hub (4).

A freewheel for blocking or interrupting a torque transmission of a motor vehicle comprises a first ring configured for the input and/or output of a torque and a second ring that is arranged substantially coaxially to the first ring and configured for the output and/or input of the torque. The freewheel includes a plurality of first blocking elements, movable between a blocking position and a freewheeling position, for blocking the first ring with the second ring in a circumferential direction in the blocking position and for interrupting a torque transmission between the first ring and the second ring in the freewheeling position. A decoupler is coupled to the second ring or to the first ring for damping rotational irregularities. The decoupler has a housing, mounted on the first ring or the second ring via a housing bearing, for providing a restoring torque directed against the rotational irregularity. A brake element, which can act indirectly or directly on the second ring and/or the first ring, is provided for damping the movement of the first ring and/or the second ring. The brake element is connected indirectly or directly to the housing of the decoupler in a rotationally fixed manner.

In a torsional damper, a damper mass is connected to a hub through a damper rubber. The hub is provided with a boss fixed to a crankshaft and a rim holding the damper rubber. The boss and the rim are coupled by plurality of spokes. The plurality of spokes each has an inclined shape inclined in the axial direction. Reinforcement portion is provided in the spokes in one direction corresponding to a bending vibration to be input among the plurality of spokes.