# US 12,110,941 B2 · Centrifugal pendulum absorber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,110,941 B2 - Document ID: US12110941B2 - Status: Granted - Kind: B2 - Application number: 17/606,037 - Filed: 2019-04-25 - Published: 2022-06-30 - Granted: 2024-10-08 - Earliest claimed: 2019-04-25 - Assignees: Volvo Truck Corporation - Applicants: Volvo Truck Corporation - Inventors: Ola Nilsson; Pär Öhrfeldt; Ödül Bilen - Web page: https://patentgrep.com/patent/US12110941B2 ## CPC - F16F 15/145: {Masses mounted with play with respect to driving means thus enabling free movement over a limited range} - F16F 15/173: provided within a closed housing {(F16F15/36 takes precedence)} - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract The invention relates to a centrifugal pendulum absorber for a flywheel, including, a plurality of pendulum weights being arranged circumferentially around a center axis of the centrifugal pendulum absorber, wherein, the centrifugal pendulum absorber further including, a plurality of closed compartments which are arranged circumferentially around the center axis, wherein at least one pendulum weight is arranged in each one of the plurality of closed compartments, wherein a channel for fluid is provided at least between two abutting closed compartments, as seen in the circumferential direction, and wherein the channel for fluid fluidly connects the two abutting closed compartments. ## Claims ### Claim 1 A centrifugal pendulum absorber for a flywheel, comprising: a plurality of pendulum weights being arranged circumferentially around a center axis of the centrifugal pendulum absorber, a plurality of closed compartments which are arranged circumferentially around the center axis, wherein at least one pendulum weight is arranged in each one of the plurality of closed compartments, and a ring member extending in a circumferential direction thereof and adapted for being connected to the flywheel, wherein a channel for fluid is provided between at least one pair of abutting closed compartments of the plurality of closed compartments, as seen in the circumferential direction, wherein the channel for fluid is at least partly provided in the ring member, and wherein the channel for fluid fluidly connects the at least one pair of abutting closed compartments, wherein the ring member comprises at least one connection portion adapted for connecting the ring member to the flywheel, which at least one connection portion extends radially inwardly towards the center axis between the at least one pair of abutting closed compartments, and wherein the channel for fluid is at least partly provided in the at least one connection portion. ### Claim 2 (depends on 1) The centrifugal pendulum absorber according to claim 1, wherein the channel for fluid comprises a plurality of channels, wherein the plurality of closed compartments comprises a plurality of pairs of abutting closed compartments, and wherein at least one channel of the plurality of channels is provided between each pair of abutting closed compartments, as seen in the circumferential direction, and wherein each channel for fluid fluidly connects each pair of abutting closed compartments. ### Claim 3 (depends on 1) The centrifugal pendulum absorber according to claim 1, wherein the channel for fluid is provided at a radial top region between the at least one pair of abutting closed compartments. ### Claim 4 (depends on 1) The centrifugal pendulum absorber according to claim 1, wherein the channel for fluid has a main extension in a circumferential extension of the centrifugal pendulum absorber. ### Claim 5 (depends on 1) The centrifugal pendulum absorber according to claim 1, wherein the ring member defines a radially outer wall for the plurality of closed compartments. ### Claim 6 (depends on 1) The centrifugal pendulum absorber according to claim 1, wherein at least one of the pendulum weights comprises at least one bearing surface adapted to cooperate with at least one corresponding bearing surface of the centrifugal pendulum absorber for allowing the pendulum weight to follow a predetermined pendulum path during use, which at least one bearing surface of the pendulum weight is provided on a radially outer side of the pendulum weight. ### Claim 7 (depends on 6) The centrifugal pendulum absorber according to claim 6, wherein the at least one of the pendulum weights comprises two circumferentially offset bearing surfaces which are provided on the radially outer side of the at least one pendulum weight. ### Claim 8 (depends on 6) The centrifugal pendulum absorber according to claim 6, further comprising a rolling element interposed in-between the cooperating bearing surfaces. ### Claim 9 (depends on 6) The centrifugal pendulum absorber according to claim 6, wherein the cooperating bearing surfaces are formed to provide a tautochronic pendulum motion of the pendulum weight during use. ### Claim 10 (depends on 1) A flywheel arrangement for an internal combustion engine, comprising, a flywheel configured to be connected to a crankshaft of an engine for common rotation around a center axis, and the centrifugal pendulum absorber according to claim 1. ### Claim 11 (depends on 10) The flywheel arrangement according to claim 10, further comprising a cover plate provided on a side face of the flywheel, wherein the plurality of closed compartments are enclosed by the side face of the flywheel and the cover plate. ### Claim 12 (depends on 11) The flywheel arrangement according to claim 11, wherein the channel for fluid is at least partly provided in the cover plate. ### Claim 13 (depends on 11) The flywheel arrangement according to claim 11, wherein the channel for fluid is at least partly provided in the side face of the flywheel. ### Claim 14 (depends on 1) A vehicle comprising the centrifugal pendulum absorber according to claim 1. ### Claim 15 (depends on 10) A vehicle comprising the flywheel arrangement according to claim 10.