# US 9,435,397 B2 · Torsional vibration damping device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,397 B2 - Document ID: US9435397B2 - Status: Granted - Kind: B2 - Application number: 14/438,508 - Filed: 2012-11-01 - Published: 2015-10-01 - Granted: 2016-09-06 - Earliest claimed: 2012-11-01 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Shingo Aijima; Yu Miyahara; Fusahiro Tsukano; Hiroyuki Amano; Hirotsugu Yoshino; Tadashi Sekiguchi; Syuhei Horita; Naoyuki Kishimoto; Yoshihiro Miyamachi - Web page: https://patentgrep.com/patent/US9435397B2 ## CPC - F16F 15/145: {Masses mounted with play with respect to driving means thus enabling free movement over a limited range} - F16H 57/0402: {Cleaning of lubricants, e.g. filters or magnets} - Y10T 74/2121: Flywheel, motion smoothing-type - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - F16H: GEARING - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention relates to a torsional vibration damping device in which a contact site with an inertial mass can be lubricated effectively while reducing resistance of the inertial mass to oscillate. The vibration damping device includes a rotary member that is rotated by a torque, and an inertial mass that is oscillated by torque pulses. The inertial mass is held in a chamber formed on the rotary member liquid-tightly together with lubrication oil while being allowed to be oscillated by torque pulses in the rotational direction of the rotary member. An amount of the lubrication oil is adjusted in a manner such that the inertial mass will not be brought into contact with an oil film of the lubrication oil centrifugally adhering to a radially outer section of an inner face of the chamber. ## Claims ### Claim 1 A torsional vibration damping device, comprising: a rotary member that is rotated by a torque; at least one inertial mass that is arranged on a radially outer portion of the rotary member while being allowed to be oscillated by torque pulses in a rotational direction of the rotary member; a raceway surface that is formed in the rotary member to which the at least one inertial mass is centrifugally pushed while being allowed to be oscillated by the torque pulses; at least one chamber that is formed on the rotary member to hold the at least one inertial mass and the raceway surface in a manner to allow the at least one inertial mass to oscillate in the rotational direction of the rotary member; and a lubrication oil encapsulated in the at least one chamber; wherein a radially outer section of an inner face of the at least one chamber on which an oil film is formed centrifugally is situated at a radially outer side of the raceway surface; wherein an amount of the lubrication oil is adjusted in a manner such that during oscillation the inertial mass oscillating along the raceway surface will not be brought into contact with the oil film of the lubrication oil centrifugally adhering to the radially outer section of the inner face of the at least one chamber. ### Claim 2 (depends on 1) The torsional vibration damping device as claimed in claim 1, wherein an oil reservoir into which the lubrication oil is introduced is arranged on a radially outer side of the at least one chamber while opening toward the at least one chamber. ### Claim 3 (depends on 2) The torsional vibration damping device as claimed in claim 2, wherein the oil reservoir is arranged on a radially outer side of the rotary member in the chamber. ### Claim 4 (depends on 2) The torsional vibration damping device as claimed in claim 2, wherein the oil reservoir is formed by projecting an outer circumferential portion of the at least one chamber in an axial direction of the rotary member. ### Claim 5 (depends on 1) The torsional vibration damping device as claimed in claim 1, further comprising: a foreign matter capturing member adapted to capture foreign matter contained in the lubrication oil that is arranged at a site where the lubrication oil comes into contact therewith. ### Claim 6 (depends on 5) The torsional vibration damping device as claimed in claim 5, wherein the foreign matter capturing member includes a magnet for capturing magnetic metal powder. ### Claim 7 (depends on 5) The torsional vibration damping device as claimed in claim 5, wherein the foreign matter capturing member includes a strainer adapted to capture solid foreign matter contained in the lubrication oil flowing therethrough. ### Claim 8 (depends on 1) The torsional vibration damping device as claimed in claim 1, wherein the at least one inertial mass includes a rolling member oscillated by the torque pulses, and further comprising a guide member that is arranged in the at least one chamber to guide the lubrication oil migrating radially inwardly from the radially outer section of the at least one chamber to the raceway surface or to the rolling member. ### Claim 9 (depends on 1) The torsional vibration damping device as claimed in claim 1, wherein the at least one chamber is comprised of a plurality of chambers, wherein the at least one inertial mass is comprised of a plurality of the inertial masses arranged in the rotary member at predetermined intervals in a circumferential direction, wherein each of the plurality of chambers is individually arranged to hold a respective one of the plurality of inertial masses, and further comprising a connection passage connecting adjoining chambers to allow the lubrication oil flowing between the adjoining chambers. ### Claim 10 (depends on 1) The torsional vibration damping device as claimed in claim 1, wherein a plurality of the inertial masses are arranged in the rotary member at predetermined intervals in a circumferential direction, and wherein the at least one chamber is comprised of a plurality of chambers formed in a manner to respectively hold the plurality of the inertial masses. ### Claim 11 A torsional vibration damping device, comprising: a rotary member that is rotated by a torque; an inertial mass that is arranged on a radially outer portion of the rotary member while being allowed to be oscillated by torque pulses in a rotational direction of the rotary member; a raceway surface that is formed in the rotary member to which the inertial mass is centrifugally pushed while being allowed to be oscillated by the torque pulses; at least one chamber that is formed on the rotary member to hold the inertial mass and the raceway surface in a manner to allow the inertial mass to oscillate in the rotational direction of the rotary member; and a lubrication oil encapsulated in the at least one chamber; wherein a radially outer section of an inner face of the at least one chamber on which an oil film is formed centrifugally is situated at a radially outer side of the raceway surface; wherein an oscillating path of the inertial mass is adjusted in a manner such that during oscillation the inertial mass oscillated by one of the torque pulses along the raceway surface will not come into contact with the oil film of the lubrication oil centrifugally adhering to the radially outer section of the inner face of the at least one chamber throughout an entirety of the oscillation path.