Patent ID: 7238112

Claim:
A torsional-vibration damper rotatably supported for translating torque between a power take-off of a prime mover and an input of a transmission, said torsional-vibration damper comprising: a primary element operatively connected for rotation with the power take-off of the prime mover; a secondary element operatively connected for rotation with the input of the transmission; a spring mechanism operatively disposed between said primary element and said secondary element and adapted to operatively couple said primary element to said secondary element in a damped-torque translational relationship; and a friction device having a plurality of fiction blocks that are each operatively supported between said primary element and said secondary element such that said friction blocks frictionally join said primary element with said secondary element; said secondary element including an output-side holding plate and a drive-side holding plate, said output-side holding plate being mounted to said drive-side holding plate such that said output-side holding plate and said drive-side holding plate operatively encompass said primary element and provide radial support for said spring mechanism, said output-side holding plate further including a first axial rim and a series of circumferential recesses formed radially inside of said first axial rim and said drive-side holding plate further including a second axial rim having a series of teeth complementary to said series of circumferential recesses, wherein said second axial rim fits inside said first axial rim with said series of teeth engaged into said series of circumferential recesses when said output-side member is mounted to said drive-side member such that said first axial rim overlaps and reinforces said second axial rim to provide a double-layered said secondary element that is substantially stiff and substantially withstands centrifugal forces generated at said spring mechanism without deflection or power loss.