Magnetic Fluid Or Material (e.g., Powder) Patents (Class 188/267.2)
  • Patent number: 10272863
    Abstract: A method and apparatus for protecting a passenger during a crash comprises a moveable seat with an energy absorber (EA) that allows the seat to stroke a finite distance to decelerate the passenger in a controlled manner. The seat is designed so that one of a plurality of fixed profile EA's can be selectively engaged to provide a tailored EA composite profile adapted to the occupant's weight and anticipated crash environment. The tailored EA composite profile applies a frequency matched, low onset force to the seat, which substantially eliminates problems associated with dynamic overshoot of the passenger's spine.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: April 30, 2019
    Assignee: Safe, Inc.
    Inventors: Stanley P. Desjardins, Lance C. Labun, April M. Pinger
  • Patent number: 10239556
    Abstract: Magnetorheological-damper-based steering apparatus and methods for reducing steering wheel jerk resulting from off-road wheel impact are described. An example steering damper apparatus includes a magnetorheological (MR) rotary damper to be operatively coupled to a steering column shaft. The example steering damper apparatus further includes a sensor to detect an angular velocity associated with the steering column shaft. The example steering damper apparatus further includes a controller to energize the MR rotary damper in response to determining that the angular velocity exceeds an angular velocity threshold. The angular velocity threshold is associated with steering wheel jerk resulting from an off-road wheel impact.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: March 26, 2019
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Geoffrey Bossio, Chris M Paiva, Steven Thompson, Zachary Grifka
  • Patent number: 10207138
    Abstract: A resistance device applied to relative rotations between a flywheel and an axis includes an inner stator, an outer rotor, a conductive wire and a magneto-rheological fluid. The inner stator is fixedly joined with the axis and includes an accommodating space surrounding the axis at a position away from the axis. The outer rotor, fixedly joined with the flywheel, encloses and rotates relative to the inner stator. An accommodating gap is formed between the outer rotor and the inner stator at a position away from the axis. The conductive wire is wound in the accommodating space, and generates a magnetic line passing the accommodating gap when applied by an electric current. The magneto-rheological fluid is filled in the accommodating gap. Thus, the outer rotor is disposed at the outer most region of the resistance device to increase the braking torque, and the magneto-rheological fluid is away from the axis to increase the braking moment.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: February 19, 2019
    Assignee: GIANT MANUFACTURING CO., LTD.
    Inventor: Hsaio-Wen Hsu
  • Patent number: 10161467
    Abstract: An active vibration controller includes: a housing; a first magnetic member installed on the side of the housing having a toric shape; a movable member including a second magnetic member that is substantially coaxial with the first magnetic member and disposed inside the toric shape of the first magnetic member; an exciting coil that generates a magnetic field in accordance with an intensity of a current supplied thereto; and a magnetic viscoelastic elastomer that has a magnetic viscoelastic property varying in accordance with a magnitude of the magnetic field from the exciting coil between the first and second tip portions, and connects the first magnetic core to the second magnetic core. The magnetic viscoelastic elastomer has a region having a non-magnetic property between the first and the second magnetic cores.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: December 25, 2018
    Assignee: Honda Motor Co., Ltd.
    Inventors: Osamu Terashima, Toshio Inoue
  • Patent number: 9920809
    Abstract: A steering damper is configured to adjust a damping force of a rotor covered by a lower casing and an upper casing by changing the viscosity of a magnetic fluid with an electromagnet. Since a magnetic fluid chamber is provided with a volume compensating unit, even when the volume of the magnetic fluid expands, or air entrainment occurs, air bubbles lighter than the magnetic fluid are collected in the volume compensating unit. Thus, characteristic variations of the steering damper due to volume expansion or air entrainment of the magnetic fluid are prevented.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: March 20, 2018
    Assignee: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Yasunobu Harazono, Nobuo Hara, Satoshi Ishikawa, Hiromi Fukuda
  • Patent number: 9827936
    Abstract: A method and vehicle control system for controlling stiffness of at least one support structure of a vehicle includes at least one of an acceleration sensor, a braking sensor and a corner sensor for providing a driving condition of the vehicle. A controller obtains information from the sensors to determine the driving condition and control the stiffness of a support structure of the vehicle. A magnetic field generator provides a magnetic field to control the stiffness of the support structure having a magnetorheological fluid or elastomer. An electrical source provides electrical current to a support structure including an electrorheological fluid or a support structure including a meta-material. When a vehicle collision is predicted no energy is provided to the support structure to minimize the stiffness and maximize energy absorbance by the support structure in a collision.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: November 28, 2017
    Assignee: Robert Bosch GmbH
    Inventor: Steven Sancricca
  • Patent number: 9797465
    Abstract: A piston of a magnetorheological fluid shock absorber is provided with a piston core having a small diameter portion mounted on an end portion of the piston rod, an enlarged diameter portion formed continuously in an axial direction with a diameter larger than the small diameter portion and forming a stepped portion, and a large diameter portion formed continuously in the axial direction with a diameter larger than the enlarged diameter portion and having a coil; a ring body surrounding the outer periphery of the piston core and forming a flow passage of the magnetorheological fluid between itself and the large diameter portion; a plate formed annularly and arranged on the outer periphery of the small diameter portion and mounted on one end of the ring body; and a stopper mounted on the small diameter portion and sandwiching the plate between the stopper and the stepped portion.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: October 24, 2017
    Assignee: KYB Corporation
    Inventors: Keiji Saito, Kazuhisa Nakamura, Takashi Teraoka
  • Patent number: 9689456
    Abstract: The entire length of a piston (20) of a magnetorheological fluid shock absorber (100) is reduced. The piston (20) includes a piston core (30) mounted on an end portion of a piston rod (21) and having a coil (33) provided on an outer periphery, a flux ring (35) surrounding the outer periphery of the piston core (30) and forming a flow passage for a magnetorheological fluid, a plate (40) formed annularly, arranged on an outer periphery of the piston rod, and joined to one end of the flux ring (35) through brazing, and a stopper containing a fixing nut (50). The flux ring (35) and the plate (40) are joined by a metal layer.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: June 27, 2017
    Assignee: KYB Corporation
    Inventor: Keiji Saito
  • Patent number: 9677641
    Abstract: A vibration damping system for machining parts uses magneto rheological radial squeeze film damper technology to reduce part vibration, enhance tool lifecycles, and to improve part surface finish. In the described embodiment, the damping system includes a pair of damping cylinders affixed to a machine tool fixture, each cylinder containing a solid core concentrically situated within an internal sleeve portion of the cylinder. Rheological fluid contained within a radial space between the core and sleeve defines a radial squeeze channel for the fluid. Fluid stiffness is controlled in real time by varying an electric current to modulate a magnetic field passing through the fluid to dampen vibrations in accordance with at least one predetermined algorithm. As material is removed from the part during machining, the fluid damping characteristics are actively managed by a machine tool controller as a function of a combination of dynamically changing and predetermined algorithmic inputs.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: June 13, 2017
    Assignee: The Boeing Company
    Inventor: Alexander P. O'Connor
  • Patent number: 9545711
    Abstract: A percussion mechanism includes a first shaft and a second shaft. One or more vanes are fastened to the first shaft. The vanes are arranged so as to be rotatable in a chamber of the second shaft. The chamber is filled with a magnetorheological fluid. A magnetic field source on the second shaft generates a magnetic field that is spatially modulated in the circumferential direction inside the chamber.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: January 17, 2017
    Assignee: Hilti Aktiengesellschaft
    Inventors: Alexander Hoop, Michael Wierer, Albert Binder, Dieter Profunser, Stefan Battlogg, Juergen Poesel
  • Patent number: 9539708
    Abstract: A hand-held power tool has a motor, a tool holder, and a percussion mechanism disposed between the motor and the tool holder in the drive train. The percussion mechanism includes a first shaft and a second shaft. A magnetically conductive ring gear is connected to the first shaft. An inner wall of the ring gear is eccentric to an axis of the second shaft. A magnetically conductive impeller is connected to the second shaft and is arranged to rotate within the ring gear. The impeller is spaced from the ring gear by a first air gap in a first position while being spaced from the ring gear by a second air gap in a second position, the first air gap being smaller than the second one. A magnet array is arranged coaxially to the second shaft. A magnetorheological fluid fills a cavity between the ring gear and the impeller.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: January 10, 2017
    Assignee: Hilti Aktiengesellschaft
    Inventors: Alexander Hoop, Albert Binder, Michael Wierer, Dieter Profunser
  • Patent number: 9520763
    Abstract: Disclosed is an active energy harvesting device. The device includes a rigid body configured to vibrate corresponding to vibration of an external vibration body and including a first end at which an energy harvesting structure is provided to convert mechanical energy into electric energy, a magneto-rheological material provided at a second end of the rigid body to be bound to the rigid body and including a material which is changed in elastic force according to the surrounding magnetic field strength, a fixing unit for binding the second end of the rigid body and the magneto-rheological material and connecting the rigid body to the external vibration body, and a first permanent magnet arranged symmetrically apart from the magneto-rheological material while interposing the magneto-rheological material therebetween and provided so as to adjust a gap from the magneto-rheological material and change an elastic coefficient of the magneto-rheological material according to the gap.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: December 13, 2016
    Assignee: CHUNG-ANG UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: Jong Won Seok, Wan Sun, Pil Kee Kim, Jee Hyun Jung
  • Patent number: 9441702
    Abstract: A magnetorheological fluid damper using magnetorheological fluid, whose viscosity changes according to an intensity of a magnetizing field, as working fluid includes a cylinder in which magnetorheological fluid is sealed, a piston which is slidably arranged in the cylinder, a first fluid chamber and a second fluid chamber which are partitioned by the piston, a main flow passage which is open on opposite end surfaces of the piston and allows communication between the first and second fluid chambers, an electromagnetic coil which generates a magnetizing field to be applied to the magnetorheological fluid flowing in the main flow passage, a bypass flow passage which is formed at a position less affected by the magnetizing field generated by the electromagnetic coil than the main flow passage, and a bypass branching portion which branches the bypass flow passage from the main flow passage.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: September 13, 2016
    Assignee: KYB CORPORATION
    Inventors: Keiji Saito, Kazuhisa Nakamura
  • Patent number: 9320720
    Abstract: A therapeutic system, designed as a laminate and including at least one adhesive laminate layer is described. Also described is a therapeutic device having such a therapeutic system. For this purpose, at least one laminate layer or one intermediate layer and/or one intermediate layer arranged between two laminate layers contains superparamagnetic nanoparticles. The therapeutic device having such a therapeutic system includes at least one electrically controllable system which is detachably connected to the therapeutic system. The electrically controllable system has a frequency-dependent electric resistance. During operation of the therapeutic device, the electrically controllable system generates an electric or magnetic field, which can be varied in orientation and intensity over time and penetrates the superparamagnetic nanoparticles. This provides a controllable therapeutic system that is independent of contact surfaces, and a therapeutic device having such a controllable therapeutic system.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: April 26, 2016
    Assignee: LTS Lohmann Therapie-Systeme AG
    Inventor: Stephan Maier
  • Patent number: 9273748
    Abstract: A magnetorheological damper system comprising a reservoir in communication with a damper. The damper comprises a damper cylinder defining a damper chamber, wherein the damper chamber contains a magnetorheological fluid and a movable damper piston. The damper piston comprises at least two coil windings on the outer surface of the damper piston, wherein the damper piston is capable of generating a magnetic field between the damper piston and a wall of the damper cylinder. The reservoir comprises a reservoir cylinder defining a passageway, wherein the reservoir includes a magnetorheological electromagnet capable of generating a magnetic field between the magnetorheological piston and a wall of the passageway. The combination of the MR reservoir and MR damper leads to a damping system capable of damping a wide range of extreme forces.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: March 1, 2016
    Assignee: MillenWorks
    Inventors: Eric N. Anderfaas, Dean Banks
  • Patent number: 9238462
    Abstract: The present invention is provided with: a traveling state detection means that detects the traveling state of a vehicle; a target attitude control amount computation means that computes the target attitude control amount of the vehicle on the basis of the traveling state; a attitude control amount computation means that computes the attitude control amount controlled by an actuator other than a shock absorber on the basis of the target attitude control amount; and an damping force control means that controls the damping force of the shock absorber on the basis of the target attitude control amount and the attitude control amount.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: January 19, 2016
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Hironobu Kikuchi, Katsuhiko Hirayama
  • Patent number: 9217487
    Abstract: In a movement damping apparatus, a magnetorheological fluid is pressed through a flow path. A device generating a variable magnetic field comprises a core around which a coil is wound as well as pole surfaces in the flow path, the magnetic field acting on the magnetorheological fluid by way of said pole surfaces. The coil is arranged within the flow path along with the core, the axis of the coil extending perpendicular to the direction of flow of the magnetorheological fluid. The flow path has a jacket made of a magnetically conducting material.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: December 22, 2015
    Assignee: INVENTUS ENGINEERING GMBH
    Inventors: Stefan Battlogg, Juergen Poesel, Gernot Elsensohn
  • Patent number: 9120527
    Abstract: In a steering damper control apparatus, when a command value output unit detects an idle spin of a rear wheel, a damper driver increases a damping force of an MR damper to be higher than a damping force thereof used when the rear wheel is not spinning idly. Therefore, skidding of the rear wheel is prevented to prevent a posture change of a motorcycle. As a result, a driving direction of the rear wheel deviating from a traveling direction is prevented to efficiently use the drive of the rear wheel during traveling.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: September 1, 2015
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Yasunobu Harazono, Masashi Matsuo, Nobuo Hara
  • Patent number: 9109654
    Abstract: A compact and failsafe magnetorheological energy absorber design including both a light weight piston (LWP) embodiment in which linear motion is subjected to a linear damping force, and a light weight rotary vane (LWRV) embodiment in which linear motion is converted into rotary motion and is subjected to a rotary damping force. Both embodiments allow increased damper stroke within a compact mechanical profile. A new lightweight Magnetorheological energy attenuation system (LMEAS) for a vehicle seat is also disclosed using the new LMRW MREA.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: August 18, 2015
    Assignees: Inno Vital Systems, Inc., University of Maryland, College Park
    Inventors: Gregory J. Hiemenz, Norman M. Wereley
  • Patent number: 9052241
    Abstract: A method for determining the temperature of an ignition coil (1), including a primary winding with a winding resistance (Rp), the primary winding being controlled by a control stage (2) with a foot resistance (Rsh), the method including the following steps: a) controlling the control stage in order to establish a primary control current; b) waiting for a predetermined time; c) determining the current Ip by measuring the voltage Vshunt and by dividing this voltage by the foot resistance Rsh; d) acquiring the value of the supply VB and the voltage Vice; e) determining the winding resistance Rp using the formula: Rp = VB - Vce Ip - Rsh f) determining the primary winding temperature using a temperature-resistance correspondence curve.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: June 9, 2015
    Assignee: CONTINENTAL AUTOMOTIVE FRANCE
    Inventor: Guy Barbaza
  • Publication number: 20150144443
    Abstract: Shock absorber and method for operating a shock absorber for a bicycle wherein a relative motion of a first and a second component interconnected via a damper device is dampened. The damper device includes a controllable damping valve with a field generating device with which a field-sensitive medium can be influenced for influencing a damping force of the damper device by applying a field intensity of the field generating device. A parameter for the current relative speeds of the first and second components is obtained in real time. For damping, a current field intensity to be set is derived in real time by way of the parameter from a characteristic damper curve and the field intensity to be currently set is generated by the field generating device in real time for setting in real time a damping force which results from the predetermined characteristic damper curve at the parameter obtained.
    Type: Application
    Filed: February 4, 2015
    Publication date: May 28, 2015
    Inventors: STEFAN BATTLOGG, MARTIN WALTHERT, GERNOT ELSENSOHN, JUERGEN POESEL
  • Publication number: 20150144442
    Abstract: A braking device capable of effectively causing a shearing stress of a magnetorheological fluid to act on both surfaces of the rotation body is provided. The present invention provides a braking device including a first soft magnetic material 1, a coil 3 attached to the first soft magnetic material 1, a second soft magnetic material 2, a activation chamber 4 formed between the first soft magnetic material 1 and the second soft magnetic material 2, and a rotation body 5 provided inside of the activation chamber 4, and a magnetorheological fluid 6 filling a gap between the rotation body 5 and the first soft magnetic material 1 and a gap between the rotation body 5 and the second soft magnetic material 2, wherein the rotation body 5 includes low magnetoresistive parts 5a, 5b made of a soft magnetic material and a high magnetoresistive part 5c in which a magnetic flux is less likely to flow, and the high magnetoresistive part 5c is provided at a portion of the rotation body 5 facing the coil 3.
    Type: Application
    Filed: March 11, 2013
    Publication date: May 28, 2015
    Applicants: Kabushiki Kaisha Somic Ishikawa, Fuji Latex Co., Ltd
    Inventors: Ryota Shimura, Daisuke Yamada
  • Patent number: 9038789
    Abstract: A method of controlling an elastomeric damper. The damper is heated by passing an electric current through the damper or through a heating element in contact with the damper said heating causing a decrease in stiffness of the damper. The elastomeric damper may comprise an elastomeric material filled with electrically conductive particles, and the damper may be heated by passing an electric current through the elastomeric material. Alternatively the damper may be heated using a discrete resistive heating element, such as a coil embedded within the elastomeric damper or wound around it.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: May 26, 2015
    Assignee: AIRBUS OPERATIONS LIMITED
    Inventors: Colin John West, David Alistair Sutton
  • Publication number: 20150136548
    Abstract: A braking device capable of generating a larger braking force is provided.
    Type: Application
    Filed: March 11, 2013
    Publication date: May 21, 2015
    Applicants: Kabushiki Kaisha Somic Ishikawa, Fuji Latex Co., Ltd.
    Inventors: Ryota Shimura, Daisuke Yamada
  • Patent number: 9033120
    Abstract: Shock absorber for an at least partially muscle-powered bicycle having a damper device having a first and a second damper chamber assigned thereto which are hydraulically coupled with one another through a damping valve. In the damping valve a flow duct with a field-sensitive, rheological medium is provided. The damping valve has a field generating device assigned to it which serves for generating and controlling a field intensity in the flow duct of the damping valve. The flow duct comprises in the damping valve a collection chamber which is hydraulically connected with the first damper chamber through a plurality of flow apertures, wherein at least one flow aperture is configured as a through hole and at least one flow aperture, as a closable valve opening provided with a one-way valve. The collection chamber is hydraulically connected hydraulically with the second damper chamber via a plurality of fan-type damping ducts each separated from one another by a fan wall.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: May 19, 2015
    Assignee: DT Swiss Inc.
    Inventors: Stefan Battlogg, Martin Walthert, Michael Kieber, Juergen Poesel
  • Publication number: 20150129379
    Abstract: The present invention refers to the field of steering dampers for motorcycles in general and in particular it refers to a steering head integrating a magnetorheological type steering damper.
    Type: Application
    Filed: July 16, 2013
    Publication date: May 14, 2015
    Inventors: Marco Pierini, Niccolo Baldanzini, Alessandro Giorgetti, Simone Piantini, Cosimo Monti
  • Publication number: 20150129378
    Abstract: A magnetorheological fluid damper using magnetorheological fluid, whose viscosity changes according to an intensity of a magnetizing field, as working fluid includes a cylinder in which magnetorheological fluid is sealed, a piston which is slidably arranged in the cylinder, a first fluid chamber and a second fluid chamber which are partitioned by the piston, a main flow passage which is open on opposite end surfaces of the piston and allows communication between the first and second fluid chambers, an electromagnetic coil which generates a magnetizing field to be applied to the magnetorheological fluid flowing in the main flow passage, a bypass flow passage which is formed at a position less affected by the magnetizing field generated by the electromagnetic coil than the main flow passage, and a bypass branching portion which branches the bypass flow passage from the main flow passage.
    Type: Application
    Filed: July 23, 2013
    Publication date: May 14, 2015
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventors: Keiji Saito, Kazuhisa Nakamura
  • Patent number: 9016318
    Abstract: A magnetorheological fluid-based device and method may include the use of magnetorheological (MR) fluid, a primary magnetic field to control the viscosity of the fluid, and a secondary magnetic field to reduce clumping of ferromagnetic particles.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: April 28, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Nilesh D. Mankame, Alan L. Browne, John C. Ulicny
  • Patent number: 9004551
    Abstract: A lockable or latchable device includes first and second members proximate to each other, at least one of which is movable with respect to the other. The device also includes a magnetorheological fluid disposed in the device such that the fluid is in simultaneous contact with at least a portion of each of the first and second members when the first and second members are in a position for locking or latching. A permanent magnet is disposed in the device to inhibit displacement of the magnetorheological fluid when the first and second members are in the locked or latched position. An electromagnet is disposed in the device such that magnetic flux from the electromagnet, when activated, disrupts the magnetic flux of the permanent magnet when the first and second members are in the locked or latched position to unlatch or unlock the device.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: April 14, 2015
    Assignee: GM Global Technology Operations LLC
    Inventors: Alan L. Browne, Geoffrey P. McKnight, Guillermo A. Herrera
  • Patent number: 9004243
    Abstract: A magneto-rheological damping assembly including a piston (28) defining a core (38). A pair of spaced electromagnets (46) are disposed about the core (38) and are connected to a controller (48) for selectively generating a magnetic flux. A pair of permanent magnets (52) are disposed about the electromagnets (46) and a pole segment (54;154;56;156) is disposed therebetween. A main gap (74) extends through the piston (28) through which magneto-rheological fluid (26) is conveyed. Flux generated by the magnets controls the viscosity of the fluid in the main gap (74) to control the damping force of the assembly. The controller (48) defines an off operating state for cancelling the flux from the permanent magnets (52) across the main gap (74).
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: April 14, 2015
    Assignee: Beijing West Industries Co., Ltd.
    Inventors: Thomas Wolfgang Nehl, Robert T. Foister, Frederic Bailly, Guy Tessier
  • Publication number: 20150090546
    Abstract: A steering damper is configured to adjust a damping force of a rotor covered by a lower casing and an upper casing by changing the viscosity of a magnetic fluid with an electromagnet. Since a magnetic fluid chamber is provided with a volume compensating unit, even when the volume of the magnetic fluid expands, or air entrainment occurs, air bubbles lighter than the magnetic fluid are collected in the volume compensating unit. Thus, characteristic variations of the steering damper due to volume expansion or air entrainment of the magnetic fluid are prevented.
    Type: Application
    Filed: May 8, 2013
    Publication date: April 2, 2015
    Inventors: Yasunobu Harazono, Nobuo Hara, Satoshi Ishikawa, Hiromi Fukuda
  • Patent number: 8985288
    Abstract: A valve for a magnetorheological fluid is formed with a duct through which the magnetorheological fluid can flow and which can be exposed to a variable magnetic field such that the flow resistance of the duct can be set using the magnetic field in the duct. The magnetic field can be lastingly generated using a magnet device that is made at least in part of magnetically hard material. The magnetization of the magnet device can be lastingly modified by a magnetic pulse of a magnetic field generation device in order to lastingly change the magnetic field in the duct and thus the flow resistance of the duct. A valve of the invention requires energy only to change settings while a specific setting can be lastingly maintained without supplying energy.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: March 24, 2015
    Assignee: Inventus Engineering GmbH
    Inventors: Stefan Battlogg, Juergen Poesel, Gernot Elsensohn
  • Patent number: 8973613
    Abstract: An ER fluid valve includes a housing and a plurality of parallel flow passages through the housing each defined by spaced electrodes at least one of which is controllable independently of other flow passages electrodes. A controller is configured to selectively establish electrical fields for all of the independently controllable electrodes to close all of the flow passages to ER fluid flowing through the housing. By removing the fields from all of the independently controllable electrodes, all the flow passages are open to the ER fluid flowing through the housing. By establishing fields for select independently controllable electrodes to close their associated flow passages and by leaving other flow passages open, restricted flow of the ER fluid through the housing is accomplished to vary the flow rate through the housing.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: March 10, 2015
    Assignee: Google Inc.
    Inventors: Michael P. Murphy, Robert Playter
  • Publication number: 20150059674
    Abstract: A torque control device includes a seal structure sealing a clearance between a hollow object and a rotation shaft. The seal structure includes a particle seal, a liquid seal, an intermediate fluid which fills a middle chamber defined between the particle seal and the liquid seal, and a coating film having a hardness higher than that of magnetic particle. The coating film is arranged to at least at a seal perimeter part of the rotation shaft, and a seal gap is defined between the particle seal and the seal perimeter part.
    Type: Application
    Filed: August 14, 2014
    Publication date: March 5, 2015
    Inventors: Seiichiro WASHINO, Takashi FURUKAWA
  • Patent number: 8967343
    Abstract: A shock absorber for a bicycle has a damper device with first and second damper chambers. The damper chambers are connected by way of a controllable throttle valve. A changeable electronic unit has a control device for controlling the electrically controllable throttle valve. The control device thereby influences the damper characteristics.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: March 3, 2015
    Assignee: DT Swiss Inc.
    Inventors: Stefan Battlogg, Martin Walthert, Gernot Elsensohn, Jürgen PöSel
  • Patent number: 8960386
    Abstract: A damping arrangement comprises a drive member arranged to be driven for angular movement relative to a housing by a motor, and a damping device independent of the motor and operable to damp oscillating motion of the drive member relative to the housing.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: February 24, 2015
    Assignee: Goodrich Actuation Systems Limited
    Inventors: Kevin Richard Hadley, David John Connors
  • Patent number: 8955653
    Abstract: A method and apparatus for a fluid damper comprising a first fluid-filled chamber, a second chamber filled with a fluid having variable flow characteristics and at least partially displaceable by the first fluid, and a gas chamber, the gas chamber compressible due to the displacement of the second chamber. In one embodiment, the fluid in the second chamber is a variable rheology fluid.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: February 17, 2015
    Assignee: Fox Factory, Incorporated
    Inventor: John Marking
  • Publication number: 20150041263
    Abstract: A magnetic viscous fluid damper includes: a cylinder; a piston that is slidably interposed within the cylinder; two fluid chambers that are partitioned by the piston; a hollow rod that is coupled to the piston; an electromagnetic coil that is formed with a magnet wire wound around the piston; two lead wires that extend from both ends of the magnet wire; and a coil assembly in which the electromagnetic coil and the two lead wires are embedded in a mold resin. The piston includes a hollow first core coupled to the rod and a second core that sandwiches the coil assembly with the first core. The two lead wires are passed through the inside of the first core and are electrically continuous with an electric wire passed through the inside of the rod.
    Type: Application
    Filed: December 3, 2012
    Publication date: February 12, 2015
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventor: Keiji Saito
  • Publication number: 20150021130
    Abstract: A magnetorheological fluid shock absorber includes a piston slidably arranged in a cylinder in which magnetorheological fluid is sealed. The piston includes a piston core which is attached to an end part of a piston rod and on the outer periphery of which a coil is provided, a flux ring which surrounds the outer periphery of the piston core and forms a flow passage for the magnetorheological fluid between the piston core and the flux ring, a first plate which is arranged on the outer periphery of the piston rod and specifies the position of one end of the flux ring in an axial direction with respect to the piston core, a second plate which is arranged on the inner periphery of the other end of the flux ring, and a first snap ring which is fitted to the inner periphery of the flux ring and fixes the second plate.
    Type: Application
    Filed: February 18, 2013
    Publication date: January 22, 2015
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventors: Keiji Saito, Kazuhisa Nakamura, Takashi Teraoka
  • Patent number: 8931604
    Abstract: The damper assembly has a damper housing at least partially defining an interior chamber. A free piston is positioned in the damper housing to separate the interior chamber into a gas-filled chamber and a fluid-filled chamber. A piston assembly is configured to move within the fluid-filled chamber and separates the fluid-filled chamber into an extension chamber and a compression chamber. A valve assembly separates the compression chamber into a primary chamber adjacent the piston assembly and a secondary chamber adjacent the free piston. The valve assembly is configured to restrict flow from the primary chamber to the secondary chamber to cause a pressure drop during compression by the piston assembly. The free piston is configured to slide within the damper housing in response to fluid displacement caused by movement of the piston rod in the fluid-filled chamber.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: January 13, 2015
    Assignee: GM Global Technology Operations LLC
    Inventor: Robert P. Marble
  • Publication number: 20140339029
    Abstract: Magnetic functional fluid includes dispersion medium; and dispersed particles which are dispersed in the dispersion medium, wherein the dispersed particles includes: first ferromagnetic particles having an average particle diameter of 0.5 ?m to 50 ?m; and second ferromagnetic particles each having a needle-like shape, each having a smaller particle size than the first ferromagnetic particles, and each having a length ratio of a long axis to a short axis of 2 or more.
    Type: Application
    Filed: May 14, 2014
    Publication date: November 20, 2014
    Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., NAGOYA INSTITUTE OF TECHNOLOGY
    Inventors: Yasushi IDO, Koichi HAYASHI, Takayuki YOSHIDA
  • Publication number: 20140332331
    Abstract: A novel method and apparatus is introduced to provide a new and robust alternative design for linear magnetorheological (MR) brakes, i.e. MR-brakes. The novel embodiments herein combines a serpentine flux path concept to eliminate conventional piston-cylinder arrangements and as a beneficial result when coupled with the linear brake embodiment disclosed herein, significantly reduce off-state friction and facilitates such devices to provide longer stroke length (i.e., infinite stroke lengths) beyond that as provided in conventional systems. The present linear brake embodiments disclosed herein thus provides, for example, for a ratio of the off-state friction force to the maximum force output at about 3% compared to 10% up to about 27% for similar conventional/commercial brake mechanisms. At the same time, the compactness is beneficially improved be being about half the size of a commercially available product.http://en.wikipedia.org/wiki/File:Paul_Patent_2939952_Fig5.
    Type: Application
    Filed: April 11, 2014
    Publication date: November 13, 2014
    Applicant: Washington State University
    Inventors: Hakan Gurocak, Mustafa Sait Alkan
  • Patent number: 8878657
    Abstract: An haptic interface including a knob manipulated by a user, a rotation shaft with a longitudinal axis to which the knob is fixed in rotation, an interaction element with a magneto-rheological fluid in rotation with the shaft, the fluid, a system for generating a magnetic field in the fluid, and a control unit capable of generating orders to the system for generating the magnetic field to modify the magnetic field. The system includes a coil type mechanism generating a variable magnetic field, and a permanent magnet type mechanism generating a permanent magnetic field.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: November 4, 2014
    Assignee: Commissariat a l'Energie Atomique et aux Energies Alternatives
    Inventors: Florian Periquet, Samuel Roselier, Jose Lozada, Moustapha Hafez
  • Patent number: 8851247
    Abstract: A damper includes a bobbin which is housed in a cylinder and on which a coil is wound and yokes housed in the cylinder. At least one of the yokes is disposed at a first axial side of the bobbin, and at least one other of the yokes is disposed at a second axial side of the bobbin. A magnetic viscous fluid is retained on inner surfaces of the yokes and an inner surface of the bobbin. Sealing members are configured to prevent leakage of the magnetic viscous fluid. A shaft extends through the yokes, the bobbin and the sealing members and is configured to be axially reciprocable relative to the yokes, the bobbin and the sealing members such that reciprocation of the shaft does not substantially displace the magnetic viscous fluid. The coil, the bobbin and the yokes are fixed together by a resin.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: October 7, 2014
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Consumer Electronics Holdings Corporation, Toshiba Home Appliances Corporation
    Inventor: Tsuyoshi Shiga
  • Patent number: 8844914
    Abstract: Disclosed is a variable differential mount apparatus using a Magnetorheological Elastomer (MRE). The apparatus includes a core, a coil, a plurality of MRE supports, and a magnetic path formation member. The core has a plurality of arms disposed thereon. The coil is wound on the plurality of arms, respectively. The plurality of MRE supports are disposed to face the plurality of arms, respectively. The magnetic path formation member is disposed outside the plurality of MRE supports. More specifically, a current is applied to coil to vary the degree of stiffness of the variable differential mount based on a particular driving condition to allow for increased handling and comfort.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: September 30, 2014
    Assignees: Hyundai Motor Company, IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)
    Inventors: Min Soo Kim, Kyung Mo Yang, Seong Hoon Lee, Ji Hyun Yoon, Un Chang Jeong, In Hyung Yang, Jae Eung Oh
  • Patent number: 8820492
    Abstract: A soft-matrix magnetorheological material vibration isolation system includes a first mounting plate. A first layer of soft-matrix magnetorheological material has opposing first and second faces, the first face coupled to the first mounting plate. A first electromagnet has opposing first and second pole faces, the first pole face coupled to the second face of the first layer of soft-matrix magnetorheological material. A second layer of soft-matrix magnetorheological material has opposing first and second faces, the first face coupled to the second pole face of the first electromagnet. A second mounting plate is coupled to the second face of the second layer of soft-matrix magnetorheological material, the second mounting plate adapted to be coupled to a load mass.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: September 2, 2014
    Assignee: Advanced Materials and Devices, Inc.
    Inventors: Barkan Mehmet Kavlicoglu, Yanming Liu, Huseyin Sahin, Bryce Wallis
  • Publication number: 20140217660
    Abstract: A tie bar assembly includes front and rear units each including inner inserts interconnected with outer inserts with webs of elastomeric material. A pole sub-assembly is disposed between the units. The pole sub-assembly and the units define front and rear fluid chambers containing a magneto-rheological fluid. Fluid orifices are disposed through the pole sub-assembly for flow of the magneto-rheological fluid between fluid chambers. An electromagnet coil generates an electromagnetic field to affect viscosity of the magneto-rheological fluid. A connecting rod connects inner inserts and is slidably disposed through the pole sub-assembly for causing movement of the magneto-rheological fluid between fluid chambers. A displacement sensor detects movement to generate a signal to the electromagnet coil. Front and rear travel cushions are each disposed on the inner inserts for limiting the movement of the inner inserts toward the pole sub-assembly.
    Type: Application
    Filed: June 4, 2012
    Publication date: August 7, 2014
    Applicant: BEIJING WEST INDUSTRIES CO., LTD.
    Inventors: Stephen Lewis Setty, David John Barta, Brent Wade Fourman, Eric Louis Schumann, Steven E. Pyle
  • Patent number: 8770358
    Abstract: A first hydraulic fluid passage includes an annular fluid passage, an inlet hole and a notch of a magnetic passage forming ring, another notch and a communication hole of a non-magnetic passage forming ring, an outlet hole and a discharge hole of a valve plate, another discharge hole of a valve plate retainer, and a first fluid passage of a one-way valve retainer. On the other hand, a second hydraulic fluid passage includes a second fluid passage of the one-way valve retainer, and the annular fluid passage.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: July 8, 2014
    Assignee: Honda Motor Co., Ltd
    Inventor: Kiyoshi Nakajima
  • Patent number: 8770357
    Abstract: An apparatus of a damper (46) for a bicycle comprising a housing defining a chamber, and a piston, movable in the chamber along a first direction. The apparatus further comprises a controllable means to vary the resistance to movement of the piston in the chamber, a sensor (62), and a controller (58) including a timer. Said sensor measures at least one dynamic quantity and produces an output signal based thereon. Said output signal is received by the controller, and said controller controls said controllable means based on said dynamic quantity as a function of time to control the level of damping. The invention further provides means for manually adjusting the level of rebound damping.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: July 8, 2014
    Assignee: University of Sheffield
    Inventors: Neil David Sims, David Craig Batterbee
  • Publication number: 20140182959
    Abstract: Methods and apparatus are provided for attenuating vibrations in the header of a vehicle to reduce acoustic noise. The apparatus includes a fluid damper configured to be coupled to a header of a vehicle and an accelerometer for sensing vibrations in the header and providing a signal to adjust the fluid damper thereby attenuating the vibrations. A method is provided which includes receiving a signal indicating a vibration in a header of a vehicle and adjusting a fluid damper coupled to the header in response to the signal thereby attenuating the vibration.
    Type: Application
    Filed: December 31, 2012
    Publication date: July 3, 2014
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: MARK A. STEBBINS, SHAWN G. QUINN, CHRISTOPHER A. STIRLEN