# US 2019/0257385 A1 · Torque fluctuation inhibiting device, torque converter and power transmission device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0257385 A1 - Document ID: US20190257385A1 - Status: Published application - Kind: A1 - Application number: 16/273,780 - Filed: 2019-02-12 - Published: 2019-08-22 - Earliest claimed: 2018-02-21 - Assignees: Exedy Corporation - Applicants: EXEDY Corporation - Inventors: Yusuke TOMITA; Tomohiro WADA - Web page: https://patentgrep.com/patent/US20190257385A1 ## CPC - F16F 15/13128: {the damping action being at least partially controlled by centrifugal masses (flywheels characterised by means to vary the moment of inertia F16F15/31)} - F16F 15/145: {Masses mounted with play with respect to driving means thus enabling free movement over a limited range} - F16F 15/13157: {with a kinematic mechanism or gear system, e.g. planetary (F16F15/13128 takes precedence)} - F16F 15/13407: {Radially mounted springs} - F16F 15/31: characterised by means for varying the moment of inertia - F16F 15/315: characterised by their supporting arrangement, e.g. mountings, cages, securing inertia member to shaft (F16F15/31 takes precedence) - F16H 45/02: with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H61/14) - F16F 2222/08: Inertia - F16F 2230/0064: using a cam - F16H 2045/0205: {two chamber system, i.e. without a separated, closed chamber specially adapted for actuating a lock-up clutch} - F16H 2045/0221: {with damping means} - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - F16H: GEARING ## Abstract A torque fluctuation inhibiting device configured to inhibit torque fluctuations is disclosed. The torque fluctuation inhibiting device comprises a first rotor, a second rotor disposed to be rotatable relative to the first rotor, a centrifugal element, and a cam mechanism. The centrifugal element is configured to receive a centrifugal force generated by rotation of the first rotor. The centrifugal element is disposed to be movable with respect to the first rotor. The centrifugal element includes an engaging portion configured to be engage with the first rotor. The centrifugal element is formed by a plurality of components. The cam mechanism is configured to generate a circumferential force in movement of the centrifugal element and the circumferential force reduces relative displacement between the first rotor and the second rotor. ## Claims ### Claim 1 A torque fluctuation inhibiting device configured to inhibit torque fluctuations, the torque fluctuation inhibiting device comprising: a first rotor; a second rotor disposed to be rotatable relative to the first rotor; a centrifugal element configured to receive a centrifugal force generated by rotation of the first rotor, the centrifugal element disposed to be movable with respect to the first rotor, the centrifugal element including an engaging portion configured to be engage with the first rotor, the centrifugal element formed by a plurality of components; and a cam mechanism configured to generate a circumferential force in movement of the centrifugal element, the circumferential force reducing relative displacement between the first rotor and the second rotor. ### Claim 2 (depends on 1) The torque fluctuation inhibiting device according to claim 1, wherein the cam mechanism is formed by a cam follower portion and a cam portion, the cam follower portion provided on the second rotor, the cam portion provided on the centrifugal element, the cam portion engaged with the cam follower portion, and the plurality of components include a first component and a second component, the first component including the engaging portion, the second component provided separately from the first component, the second component including at least part of the cam portion. ### Claim 3 (depends on 2) The torque fluctuation inhibiting device according to claim 2, wherein the cam portion is provided on the second component. ### Claim 4 (depends on 2) The torque fluctuation inhibiting device according to claim 2, wherein the cam portion is provided on the first component and the second component. ### Claim 5 (depends on 2) The torque fluctuation inhibiting device according to claim 2, wherein the engaging portion includes a first engaging portion and a second engaging portion, the second engaging portion disposed in opposition to the first engaging portion, the first engaging portion is provided on one of a pair of first components including the first component, and the second engaging portion is provided on the other of the pair of first components. ### Claim 6 (depends on 2) The torque fluctuation inhibiting device according to claim 2, wherein the engaging portion includes a first engaging portion and a second engaging portion, the second engaging portion disposed in opposition to the first engaging portion, and the first engaging portion and the second engaging portion are provided on a pair of first components including the first component on a one-to-one basis. ### Claim 7 (depends on 2) The torque fluctuation inhibiting device according to claim 2, wherein the second component is disposed between a pair of first components including the first component. ### Claim 8 (depends on 1) The torque fluctuation inhibiting device according to claim 1, wherein the cam mechanism is formed by a cam follower portion and a cam portion, the cam follower portion provided on the second rotor, the cam portion provided on the centrifugal element, the cam portion engaged with the cam follower portion, the plurality of components include a third component and a fourth component, the fourth component provided separately from the third component, each of the third and fourth components includes the engaging portion, and one of the third and fourth components includes the cam portion. ### Claim 9 (depends on 8) The torque fluctuation inhibiting device according to claim 8, wherein the cam portion is integrated with the one of the third and fourth components. ### Claim 10 (depends on 8) The torque fluctuation inhibiting device according to claim 8, wherein the engaging portion includes a third engaging portion and a fourth engaging portion, the fourth engaging portion disposed in opposition to the third engaging portion, the third engaging portion is provided on one of the third and fourth components, and the fourth engaging portion is provided on the other of the third and fourth components. ### Claim 11 (depends on 1) A torque converter disposed between an engine and a transmission, the torque converter comprising: an input-side rotor to which a torque is inputted from the engine; an output-side rotor configured to output the torque to the transmission; a damper disposed between the input-side rotor and the output-side rotor; and the torque fluctuation inhibiting device recited in claim 1. ### Claim 12 (depends on 1) A power transmission device comprising: a flywheel including a first inertia body, a second inertia body and a damper, the first inertia body rotated about a rotational axis, the second inertia body rotated about the rotational axis, the second inertia body rotatable relative to the first inertia body, the damper disposed between the first inertia body and the second inertia body; a clutch device provided between the second inertia body of the flywheel and a transmission; and the torque fluctuation inhibiting device recited in claim 1.