A torsional vibration damper comprises an outer housing, an inner part concentric relative to the outer housing, a plurality of chambers formed between the outer housing and the inner part and being filled with a damping medium, a plurality of leaf spring assemblies joining the outer housing and the inner part in a torsionally flexible manner, wherein each of the leaf spring assemblies is arranged in one of said chambers and separates the corresponding chamber into sub-chambers, a plurality piston chambers formed separately in the outer housing, wherein each piston chamber is connected with the sub-chambers of one of the chambers, and a plurality of pistons adjustably arranged in the piston chambers, respectively, for controlling the flow of damper medium between the sub-chambers of a chamber. The damping properties of this torsional vibration damper can be adjusted easily.

A torsional vibration damper (1) having a hub part (2) (primary mass) that is able to be fastened to a driveshaft of a motor, and an inertia ring (3) (secondary mass) that surrounds the hub part (2) in the radially outer region, wherein a fluid-filled gap (4) and sealing devices (5), by means of which the escape of the fluid is intended to be avoided, are provided between the hub part (2) and inertia ring (3), wherein the sealing devices (5) each have a first ring (6), tightly connected to the hub part (2), and each have a second ring (7), tightly connected to the inertia ring (3), and each have a sealing element (12) made of an elastomer, which is connected in each case sealingly to the first ring (6) on one side and in each case to the second ring (7) on the other side, is configured such that the respective sealing element (12) has been vulcanized onto a respective external axial side of the first and second ring (6, 7) by fastening portions.

A fluid damping structure includes first and second annular elements, first and second inner seals, a first outer seal, a damping chamber, a supply plenum, a fill port, and a plurality of fluid passages. The first and second inner seals are disposed radially between and are engaged with the first annular element and the second annular element. The first outer seal forms a sealing interface between the first and second annular elements. The first outer seal is disposed radially outward from the first and second inner seals. The damping chamber is defined by the first and second annular elements and the first and second inner seals. The supply plenum is disposed contiguous with an axial side of the damping chamber and extends from the second inner seal to the first outer seal. The fill port is in fluid communication with the supply plenum and a source of damping fluid.

A torsional vibration damper in the form of a two-mass flywheel for a motor vehicle, the dual-mass flywheel having a primary mass that is connected to the drive shaft of a drive engine in a torsionally rigid manner and revolves therewith, at least one energy storage element, and a secondary mass which is driven in a torsionally flexible manner by the primary mass via the energy storage element. The torque fed into the primary mass via the drive shaft is transmitted to at least one further link of the motor vehicle drive train arranged in a housing via an output shaft of the secondary mass. The primary mass is designed as a rotationally symmetrical hollow body that is concentric to its axis of rotation, open at least on one side, surrounds the secondary mass.

An internal viscous rotational damping (VRD) assembly for transmitting torque from a drive member connector to a load member connector is provided. The VRD assembly comprises a spacer tube connected between the drive member connector and the load member connector, wherein the spacer tube includes a longitudinal axis and an inner surface that extends along the longitudinal axis. The VRD assembly further includes a damper bar disposed within the spacer tube. The damper bar includes an outer surface, wherein a cavity is defined between the outer surface of the damper bar and the inner surface of the spacer tube, and wherein the cavity is configured for receiving a viscous fluid.

A sealing structure allows for formation of a labyrinth structure between an oil seal and a torsional vibration damper even when the oil seal does not include a side lip. The oil seal 100 includes an oil lip 121 provided such as to be slidable on an outer circumferential surface of a tubular part 210, and a dust lip 122 provided further on an air side (A) than the oil lip 121 and slidable on the outer circumferential surface of the tubular part 210. An annular member 250 is further provided, which is fixed to the outer circumferential surface of the tubular part 210 further on the air side (A) than the dust lip 122 and covering an outer circumferential surface of the dust lip 122 such that there is a gap between the annular member 250 itself and the outer circumferential surface of the dust lip 122.

An internal viscous rotational damping (VRD) assembly for transmitting torque from a drive member connector to a load member connector is provided. The VRD assembly comprises a spacer tube connected between the drive member connector and the load member connector, wherein the spacer tube includes a longitudinal axis and an inner surface that extends along the longitudinal axis. The VRD assembly further includes a damper bar disposed within the spacer tube. The damper bar includes an outer surface, wherein a cavity is defined between the outer surface of the damper bar and the inner surface of the spacer tube, and wherein the cavity is configured for receiving a viscous fluid.

A viscous damper 10 has a hub plate 11 mounted on a rotation axis, the hub plate 11 is provided with a cylinder portion 12 protruding axially, and the flange 14 protrudes radially outward from the cylinder portion. An inertia mass body 20 arranged outside the flange 14 includes a first annular inertia member 21 and a second annular inertia member 22, and a journal bearing 20 is arranged between the inertia mass body 20 and the flange 14. An inner periphery portion of the first annular inertia member 21 is provided with a first slid seal 41 for sealing damping liquid, and an inner periphery portion of the second annular inertia member 22 is provided with a second slid seal 42 for sealing the damping liquid L.

A sealing structure allows for formation of a labyrinth structure between an oil seal and a torsional vibration damper even when the oil seal does not include a side lip. The oil seal 100 includes an oil lip 121 provided such as to be slidable on an outer circumferential surface of a tubular part 210, and a dust lip 122 provided further on an air side (A) than the oil lip 121 and slidable on the outer circumferential surface of the tubular part 210. An annular member 250 is further provided, which is fixed to the outer circumferential surface of the tubular part 210 further on the air side (A) than the dust lip 122 and covering an outer circumferential surface of the dust lip 122 such that there is a gap between the annular member 250 itself and the outer circumferential surface of the dust lip 122.

A torsional vibration damper has a hub part (primary mass) which can be fastened on a drive shaft of an engine and a flywheel ring (secondary mass) which surrounds the hub part in the radially outer region, wherein a gap filled with a fluid and one or more sealing devices are provided between the hub part and the flywheel ring, by which escape of fluid is to be prevented. The sealing devices each have a first ring, which is tightly connected to the hub part, as well as a second ring, which is tightly connected to the flywheel ring, as well as a sealing element made of a plastic material. The respective sealing element is connected in a material-locking manner to fastening sections on a respective outer axial side of the first and second ring. The sealing element has at least one elastically deformable axial projection in the region of each of the fastening sections.