# US 6,719,112 B2 · Torsion damping mechanism with auxiliary mass > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,719,112 B2 - Document ID: US6719112B2 - Status: Granted - Kind: B2 - Application number: 09/972,278 - Filed: 2001-10-05 - Published: 2002-04-25 - Granted: 2004-04-13 - Earliest claimed: 2000-10-25 - Assignees: Mannesmann Sachs AG - Inventors: Bernd Peinemann; Jürgen Weth; Cora Carlson; Paul Kraus; Reinhard Feldhaus; Hartmut Bach - Web page: https://patentgrep.com/patent/US6719112B2 ## CPC - F16F 15/13171: {Bearing arrangements (F16F15/13192 takes precedence)} - F16F 15/1397: {Overload protection, i.e. means for limiting torque} - F16F 15/1492: {with a dry-friction connection} - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract A torsion damping mechanism with a torsion damper with an input side and an output side, where the input side and the output side are connected elastically to each other by spring-type stored energy elements for rotation in common auxiliary mass which can rotate coaxially to the torsion damping mechanism is connected frictionally to the torsion damping mechanism by way of a friction area, where the frictional connection between the torsion damping mechanism and the auxiliary mass has a predetermined frictional moment. When this moment is exceeded during the occurrence of peaks in the torque being applied to the torsion damping mechanism, the auxiliary mass can slip or slips. ## Claims ### Claim 1 A torsion damping mechanism comprising an input side comprising a primary flywheel to which torque is applied, an output side comprising a secondary flywheel to which torque is transmitted, spring-type stored energy elements permanently connecting said input side and said output side for rotation in common about a rotational axis, and an auxiliary mass which can rotate about said axis and has a frictional connection to one of said input side and said output side, said auxiliary mass having a predetermined frictional moment which, when exceeded during peaks in torque applied to said input side, causes said auxiliary mass to slip with respect to said one of said input side and said output side. ### Claim 2 (depends on 1) A torsion damping mechanism as in claim 1 further comprising an elastic element between the auxiliary mass and the other of said input and said output side, said elastic element pressing said auxiliary mass toward said frictional connection. ### Claim 3 (depends on 1) A torsion damping mechanism as in claim 1 further comprising a plurality of fastening elements for fastening said input side to a drive shaft, said fastening elements being arranged on a circle concentrically to said rotational axis, said auxiliary mass being supported radially inside said circle. ### Claim 4 (depends on 1) A torsion damping mechanism as in claim 1 wherein said auxiliary mass is frictionally connected to said input side. ### Claim 5 (depends on 1) A torsion damping mechanism as in claim 1 wherein said auxiliary mass is frictionally connected to said output side. ### Claim 6 (depends on 1) A torsion damping mechanism as in claim 1 further comprising a cover plate mounted on said primary flywheel, said auxiliary mass being supported radially on one of said cover plate and said primary flywheel, a friction plate extending radially from said cover plate, said auxiliary mass being frictionally connected to said friction plate, and an elastic element which holds said auxiliary mass axially between said friction plate and said flywheel. ### Claim 7 (depends on 1) A torsion damping mechanism as in claim 1 further comprising a hub disk on which said secondary flywheel is mounted, said auxiliary mass being supported radially on said secondary flywheel and extending between said secondary flywheel and said hub disk, said auxiliary mass being frictionally connected axially to said flywheel, and an elastic element between the auxiliary mass and the hub disk, said elastic element pressing the auxiliary mass against the secondary flywheel. ### Claim 8 (depends on 1) A torsion damping mechanism as in claim 1 wherein said auxiliary mass has a mass moment of inertia and said one of said input side and said output side to which it is connected has a mass moment of inertia, said mass moment of inertia of said auxiliary mass having a ratio of at least 0.1 with respect to said mass moment of inertia of said one of said input side and said output side. ### Claim 9 (depends on 1) A torsion damping mechanism as in claim 1 further comprising a hub disk on which said secondary flywheel is mounted, said auxiliary mass being supported radially on said secondary flywheel and extending between said secondary flywheel and said hub disk, said auxiliary mass being frictionally connected axially to said secondary flywheel, and an elastic element between the auxiliary mass and said input side, said elastic element pressing the auxiliary mass against the secondary flywheel. ### Claim 10 (depends on 9) A torsion damping mechanism as in claim 9 wherein said primary flywheel extends radially outward beyond the hub disk, said elastic element being located axially between said auxiliary mass and said primary flywheel. ### Claim 11 (depends on 1) A torsion damping mechanism as in claim 1 wherein said auxiliary mass being supported radially on said primary flywheel and extends radially inside said secondary flywheel, said auxiliary mass being frictionally connected axially to said secondary flywheel, said mechanism further comprising a hub disk on which said secondary flywheel is mounted, a support element on said secondary flywheel, and an elastic element between said auxiliary mass and said support element, said elastic element pressing the auxiliary mass against the secondary flywheel. ### Claim 12 (depends on 1) A torsion damping mechanism as in claim 1 further comprising stops which limit the rotation of the auxiliary mass about the axis. ### Claim 13 (depends on 12) A torsion damping mechanism as in claim 12 wherein said stops comprise a stop element fixed to one of said input and output sides, said auxiliary mass having a recess in which said stop element engages, said recess having tangential ends which limit relative motion of the stop element in the recess. ### Claim 14 (depends on 13) A torsion damping mechanism as in claim 13 wherein said stop element is fixed to one of said flywheels. ### Claim 15 A torsion damping element as in 14 wherein said auxiliary mass is not frictionally connected to said one of said flywheels. ### Claim 16 (depends on 14) A torsion damping mechanism as in claim 14 wherein said auxiliary mass is frictionally connected to said one of said flywheels. ### Claim 17 (depends on 1) A torsion damping mechanism as in claim 1 further comprising an output hub on which said auxiliary mass is supported radially, said output hub having a radially extending hub disc, said auxiliary mass being frictionally connected axially to said hub disc. ### Claim 18 (depends on 17) A torsion damping mechanism as in claim 17 further comprising an elastic element mounted radially on said output hub, said elastic element pressing said auxiliary mass axially against said hub disc.