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 clutch device includes an outer disk carrier, outer disks, an inner disk carrier, inner disks, and at least one lug. The outer disk carrier has first axially running grooves, a first edge, and a first edge side. Each of the outer disks has radial projections spaced apart by depressions and projecting into the first axially running grooves. The inner disk carrier has second axially running grooves, a second edge, and a second edge side. Each of the inner disks has radial projections spaced apart by depressions and projecting into the second axially running grooves. The lug is arranged between two grooves of the first axially running grooves and extending axially from the first edge side, or arranged between two grooves of the second axially running grooves and extending axially from the second edge side.

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 clutch device includes an outer disk carrier, outer disks, an inner disk carrier, inner disks, and at least one lug. The outer disk carrier has first axially running grooves, a first edge, and a first edge side. Each of the outer disks has radial projections spaced apart by depressions and projecting into the first axially running grooves. The inner disk carrier has second axially running grooves, a second edge, and a second edge side. Each of the inner disks has radial projections spaced apart by depressions and projecting into the second axially running grooves. The lug is arranged between two grooves of the first axially running grooves and extending axially from the first edge side, or arranged between two grooves of the second axially running grooves and extending axially from the second edge side.

A hybrid transmission component includes a composite tube defining a central axis along its length and extending between a first end and a second end opposite to the first end. The composite tube includes a tube inner surface extending circumferentially about the central axis and a tube outer surface that is radially spaced apart from the tube inner surface with respect to the central axis. The composite tube further includes a first tube axial end surface extending between the tube inner surface and the tube outer surface at the first end and a second tube axial end surface extending between the tube inner surface and the tube outer surface at the second end. The tube inner surface comprises a wedge portion disposed at the first end.