# US 8,465,372 B2 · Torque fluctuation absorbing apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,372 B2 - Document ID: US8465372B2 - Status: Granted - Kind: B2 - Application number: 12/729,919 - Filed: 2010-03-23 - Published: 2010-09-30 - Granted: 2013-06-18 - Earliest claimed: 2009-03-24 - Assignees: Aisin Seiki Kabushiki Kaisha - Applicants: Tomohiro Saeki; Satoshi Nakagaito; Toshiyuki Saburi; Masanori Suzuki; Hiroaki Suezaki - Inventors: Tomohiro Saeki; Satoshi Nakagaito; Toshiyuki Saburi; Masanori Suzuki; Hiroaki Suezaki - Web page: https://patentgrep.com/patent/US8465372B2 ## CPC - F16F 15/1297: {Overload protection, i.e. means for limiting torque} - F16F 15/1292: {characterised by arrangements for axially clamping or positioning or otherwise influencing the frictional plates} - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract The torque fluctuation absorber includes a flywheel fixed on a first rotating shaft by a fixation member, a damper unit connected with a second rotating shaft and absorbs fluctuation of torque occurred between the first rotating shaft and the second rotating shaft by elastic force, and a limiter unit provided on a power transmission path between the flywheel and the damper unit and inducing a slide when the fluctuation of the torque exceeded a predetermined value. A predetermined member rotates with the first rotating shaft on a power transmission path between the first rotating shaft and the limiter unit. The predetermined member has a side plate at the damper unit and a guide portion that prevents movement radially of a hub member, and the guide portion is provided at radially internal side of the fixation member. ## Claims ### Claim 1 A torque fluctuation absorber, comprising: a flywheel fixed on a first rotating shaft by a fixation member, a damper unit connected with a second rotating shaft and for absorbing fluctuation of a torque occurred between the first rotating shaft and the second rotating shaft by elastic force, a limiter unit provided on a power transmission path between the flywheel and the damper unit, wherein the limiter unit induces a slide when the fluctuation of the torque exceeded a predetermined value, and a predetermined member rotating with the first rotating shaft on a power transmission path between the first rotating shaft and the limiter unit, wherein the predetermined member has a guide portion that prevents movement of the damper unit in a transverse direction to a rotating axis, and wherein the guide portion is provided at radially internal side of the fixation member, the predetermined member being a guide member made of an elastic body which is fixed on the first rotating shaft, wherein the damper unit comprises a plate member connected to the limiter unit, and a hub member connected to the second rotating shaft, and the guide portion contacts both the plate member and the hub member and prevents movement of both the plate member and the hub member in a direction transverse to the rotating axis. ### Claim 2 (depends on 1) The torque fluctuation absorber according to claim 1, wherein the first rotating shaft comprises a cylindrical elongated portion extending toward the damper unit, and wherein the guide member is attached at an outer or internal circumference of the elongated portion. ### Claim 3 (depends on 1) The torque fluctuation absorber according to claim 1, wherein the guide member is fixed to the first rotating shaft by the fixation member with the flywheel to be coaxial with the first rotating shaft. ### Claim 4 (depends on 1) The torque fluctuation absorber according to claim 1, wherein the guide member has a slit or a cavity at the guide portion. ### Claim 5 (depends on 1) The torque fluctuation absorber according to claim 1, wherein the guide member permits a predetermined displacement of the damper unit in a transverse direction to the rotating axis of the predetermined member while generating a resisting force against movement of the damper unit. ### Claim 6 A torque fluctuation absorber, comprising: a flywheel fixed on a first rotating shaft by a fixation member, a damper unit connected with a second rotating shaft and for absorbing fluctuation of a torque occurred between the first rotating shaft and the second rotating shaft by elastic force, a limiter unit provided on a power transmission path between the flywheel and the damper unit, wherein the limiter unit induces a slide when the fluctuation of the torque exceeded a predetermined value, and a predetermined member rotating with the first rotating shaft on a power transmission path between the first rotating shaft and the limiter unit, wherein the predetermined member has a guide portion that prevents movement of the damper unit in a transverse direction to a rotating axis, and wherein the guide portion is provided at radially internal side of the fixation member, wherein the damper unit comprises a plate member connected to the limiter unit, and a hub member connected to the second rotating shaft, and the guide portion contacts both the plate member and the hub member and prevents movement of both the plate member and the hub member in a direction transverse to the rotating axis, wherein the guide portion is formed cylindrically and has a penetration hole portion. ### Claim 7 (depends on 6) The torque fluctuation absorber according to claim 6, wherein the guide portion has a tapered portion or a step portion that increases in diameter in accordance with a position from the damper unit to the flywheel at the damper unit side of the penetration hole portion. ### Claim 8 (depends on 6) The torque fluctuation absorber according to claim 6, wherein the penetration hole portion is a radially extending penetration hole portion that penetrates both a radially inwardly facing inner circumference side of the guide and a radially outwardly facing outer circumference side of the guide.