A clutch includes a hub and a flange located radially inside and outside, respectively, with respect to the clutch rotational axis and associated with hub and flange sides of the clutch. A spring elastically supports the hub and flange sides against each other in the circumferential direction in a torque-transmitting manner. A bearing radially supports the hub and flange sides against one another for rotation around the axis and includes an outer ring supporting the hub and an inner ring supported on a bearing pin associated with the flange side. A friction device connects the hub and flange sides in a friction-locked and torque-transmitting manner in the circumferential direction and includes a friction element and a friction surface which are pretensioned against one another in the axial direction. A tensioning device includes a tensioning element that applies force to, and axially pretensions, the friction device and bearing.

A hysteresis torque generating mechanism includes a first rotor having a slide surface, and a second rotor opposed to the first rotor. The second rotor is configured to slide against the slide surface of the first rotor so as to generate a hysteresis torque. The second rotor includes an initial contact portion and a main friction surface. The initial contact portion is provided to protrude toward the first rotor. The initial contact portion is configured to slide in contact with the slide surface of the first rotor. The main friction surface is configured to slide in contact with the slide surface of the first rotor after abrasion of the initial contact portion.

A hysteresis torque generating mechanism includes a first rotor having a slide surface, and a second rotor opposed to the first rotor. The second rotor is configured to slide against the slide surface of the first rotor so as to generate a hysteresis torque. The second rotor includes an initial contact portion and a main friction surface. The initial contact portion is provided to protrude toward the first rotor. The initial contact portion is configured to slide in contact with the slide surface of the first rotor. The main friction surface is configured to slide in contact with the slide surface of the first rotor after abrasion of the initial contact portion.

A coulomb friction damped drive shaft may include an outer shaft defined by a longitudinal axis, a first tapered portion and a second tapered portion at opposite ends of the outer shaft; an inner shaft inserted through the outer shaft along the longitudinal axis and defined by a first uniform portion a second uniform portion adjacent to opposite ends of the inner shaft; a first tapered sleeve inserted between the first uniform portion and the first tapered portion; and a second tapered sleeve inserted between the second uniform portion and the second tapered portion. The first tapered sleeve may be biased along the longitudinal axis toward the second tapered sleeve to create a friction between the inner shaft and the outer shaft. The friction may act on a twisting motion of the inner shaft relative to the outer shaft to coulomb friction dampen oscillations in the inner shaft.

A coulomb friction damped drive shaft may include an outer shaft defined by a longitudinal axis, a first tapered portion and a second tapered portion at opposite ends of the outer shaft; an inner shaft inserted through the outer shaft along the longitudinal axis and defined by a first uniform portion a second uniform portion adjacent to opposite ends of the inner shaft; a first tapered sleeve inserted between the first uniform portion and the first tapered portion; and a second tapered sleeve inserted between the second uniform portion and the second tapered portion. The first tapered sleeve may be biased along the longitudinal axis toward the second tapered sleeve to create a friction between the inner shaft and the outer shaft. The friction may act on a twisting motion of the inner shaft relative to the outer shaft to coulomb friction dampen oscillations in the inner shaft.

A spring seat installed in a damper device including a first rotor, a second rotor and a plurality of elastic members is disclosed. The spring seat includes an end surface support portion and an outer periphery support portion. The end surface support portion includes a recess on a radially middle part thereof. The recess is recessed toward at least one of the elastic members. The end surface support portion supports one end surface of the at least one of the elastic members. The end surface support portion is supported by a pressing surface of a first accommodation portion of the first rotor and a pressing surface of a second accommodation portion of the second rotor. The outer periphery support portion supports part of a radially outer part of the at least one of the elastic members.

The present invention relates to a torsional vibration damper (18) comprising a first component (20) and a second component (22) which are torsionally elastically coupled to one another, wherein a force transmission device (26) is provided for transmitting an actuating force from the one axial side (48) of the torsional vibration damper (18) to the opposite axial side (50) of the torsional vibration damper (18) to a device (54) to be actuated. In addition, the present invention relates to an arrangement (2) for the drivetrain of a motor vehicle comprising such a torsional vibration damper (18).

The present invention relates to a torsional vibration damper (18) comprising a first component (20) and a second component (22) which are torsionally elastically coupled to one another, wherein a force transmission device (26) is provided for transmitting an actuating force from the one axial side (48) of the torsional vibration damper (18) to the opposite axial side (50) of the torsional vibration damper (18) to a device (54) to be actuated. In addition, the present invention relates to an arrangement (2) for the drivetrain of a motor vehicle comprising such a torsional vibration damper (18).

A damper device includes: a first rotary body including a first plate rotating around a rotation shaft and a second plate disposed facing the first plate and integrally rotating with the first plate; a second rotary body rotating relative to the first rotary body; a control plate disposed between the first plate and the second rotary body in an axial direction and engaged with the second rotary body to rotate integrally therewith; a first thrust member a part of which is disposed between the first plate and the control plate in the axial direction and engaged with the first plate to rotate integrally therewith; and a second thrust member a part of which is disposed between the second plate and the second rotary body and engaged with the second plate to rotate integrally with the first rotary body.

A flexplate for a motor vehicle drivetrain includes a carry plate configured for being connected to an engine crankshaft and a drive plate. The drive plate and the carry plate are separate components attached directly via contact. The drive plate is configured for transferring torque input into the carry plate to a downstream component. A method of constructing a flexplate for a motor vehicle drivetrain includes stamping a carry plate configured for being connected to an engine crankshaft; stamping a drive plate separate from the carry plate; and attaching the drive plate and the carry plate directly together via contact. The drive plate is configured for transferring torque input into the carry plate to a downstream component.