Class / Patent application number | Description | Number of patent applications / Date published |
192210500 | FIELD RESPONSIVE FRICTIONAL MEDIA TYPE | 23 |
20080236976 | Magnetorheological Clutch - Disclosed is a magnetorheological clutch comprising a stationary part ( | 10-02-2008 |
20090026033 | Magnetorhelogical Clutch with Pot-Type Disks - A magnetorheological clutch consists of a stationary part, a primary part and a secondary part, a working space which contains a magnetorheological fluid being formed between primary part and secondary part, in which working space primary discs and secondary discs successively alternate in the radial direction, and a controllable magnetic field acting on the magnetorheological fluid. In order to prevent segregation of the fluid by centrifugal force in a simple type of construction, the working space is L-shaped in longitudinal section, the primary part is a shaft and the secondary part is a pot enclosing the working space, and are of pot-shaped design. | 01-29-2009 |
20090026034 | Magnetorheological clutch - The present invention relates to a magnetorheological clutch including a primary part, a secondary part and a magnet for the generation of a magnetic field. The primary part and the secondary part are rotatable relative to one another around an axis of rotation of the clutch, with the primary part being rotationally fixedly connected to at least one disk. The disk is surrounded by coupling gaps in which a magnetorheological medium is arranged. The thickness of the at least one disk along the coupling gap has a value of approximately 0.4 mm to approximately 1 mm, with the at least one disk being formed along the coupling gaps without material interruptions. | 01-29-2009 |
20090032353 | Apparatus with active material surface in contact with pheological fluid and method of enhancing performance thereof - An apparatus is provided having an active material forming a surface thereof in contact with a rheological fluid. The active material is controllable to vary a surface geometry thereof between a rough or nonsmooth surface geometry to increase drag, and achieve an increase in stress transmitted through the fluid, when a field is applied, while allowing a smooth surface geometry and an associated reduction in stress transmitted through the fluid when the field is removed. A method of enhancing performance of an apparatus that includes a rdeological fluid is also provided. | 02-05-2009 |
20090145713 | MAGNETORHEOLOGICAL FAN COUPLING - A magnetorheological fan coupling ( | 06-11-2009 |
20090205917 | Magnetorheological Clutch - The inventive magnetorheological clutch comprises a fixed part ( | 08-20-2009 |
20090250302 | Fast turn-off and fast turn-on in inductive load and usage in vehicle application - A fast turn-off and fast turn-on circuit ( | 10-08-2009 |
20090266666 | MAGNETO-RHEOLOGICAL CLUTCH AND WHEEL TRANSMISSION APPARATUSES AND METHODS - Magneto-rheological clutch and wheel transmission apparatuses and methods are provided. According to one aspect, a magneto-rheological clutch system can include first and second drive members and first and second driven members. A first gap can be present between the first drive and first driven members. A second gap can be present between the second drive and second driven members. A drive wheel and a snow blower impeller can be connected to the first and second driven member, respectively. First and second MR fluids can be disposed in the first and second gaps, respectively. A first magnetic field can be applied to the first MR fluid for engaging the drive wheel. A second magnetic field can be applied to the second MR fluid for engaging the snow blower impeller. The provided apparatuses and methods can also be applied to mower blades and wheels. | 10-29-2009 |
20100096233 | MULTI-GAP MAGNETORHEOLOGICAL FLUID CLUTCH - A vehicle has a multi-gap magnetorheological fluid (MRF) clutch connecting rotatable input and output members, and includes a drum connected to the output member and a rotor connected to the input member. The drum contains a magnetically-permeable stator and a magnetic core, while the rotor has a magnetically-permeable member extending axially into the drum to define an outer working gap in conjunction with the stator and an inner working gap in conjunction with the magnetic core. MR fluid fills the working gaps, and a magnetic field generator or electromagnet induces a magnetic field when electrical current is passed through a field coil therein to change an apparent viscosity of the MR fluid. The inner and outer working gaps have a predetermined inner to outer gap thickness ratio balancing the slip power dissipation per unit volume in each of the working gaps. | 04-22-2010 |
20100108453 | POWER TRANSMISSION APPARATUS - A power transmission apparatus includes a drive roller and a driven roller made of magnetic material, which are rotatable about different axes, and which are provided with a gap therebetween, a case enclosing the rollers, an input shaft and an output shaft connected coaxially with the rollers through the case, respectively, and a magnetic fluid housed in the case to fill the gap. The apparatus includes an electromagnetic coil for generating magnetism, and a magnetic path of the magnetism generated by the electromagnetic coil is formed so that a magnetic field is generated from the drive roller or the driven roller toward the driven roller or the drive roller via the gap. | 05-06-2010 |
20100200351 | MAGNETORHEOLOGICAL TORQUE TRANSMISSION DEVICE, THE USE THEREOF, AND MAGNETORHEOLOGICAL TORQUE TRANSMISSION METHOD - The present invention relates to a magnetorheological torque transmission device. The same has two device parts rotatable relative to each other about a rotational axis (R) through a torque transmission gap ( | 08-12-2010 |
20110127133 | TWIN-CLUTCH DEVICE - A twin-clutch device that selectively transmits torque from a driving wheel to a first driven wheel and/or a second driven wheel is provided. The first and second driven wheels are arranged respectively on both sides of the driving wheel, a functional fluid that decreases its flowability as an applied stimulus is increased and that increases its flowability as the applied stimulus is reduced fills gaps between the driving wheel and the first and second driven wheels, the driving wheel includes a stimulus generating member electrically controlled to generate a stimulus, and flowability of the functional fluid between the driving wheel and one of the first and second driven wheels is decreased with an increase in stimulus applied to the functional fluid by the stimulus generating member to couple the driving wheel to the one of the first and second driven wheels, thus allowing torque transmission therebetween. | 06-02-2011 |
20110209962 | VISCOUS CLUTCH WITH EDDY CURRENT REDUCTION - An electromagnetically actuated viscous clutch assembly includes a rotor arranged relative to an axis of rotation, an electromagnetic coil for generating magnetic flux, a housing positioned adjacent to the rotor to create a fluid working chamber therebetween with the housing and the rotor being selectively rotatable relative to one another, an insert extending through the housing and configured to conduct magnetic flux from the electromagnetic coil along a flux path, a valve assembly electromagnetically linked to the insert along the flux path for selectively controlling fluid flow into the working chamber to selectively engage the rotor and the housing, and a plurality of recesses defined in a portion of the housing located at an interior of the flux path to reduce eddy currents. | 09-01-2011 |
20110278122 | CLUTCH ASSEMBLY - A viscous fluid clutch for use as a clutch for a cooling fan for a vehicle, the clutch includes an input shaft, a rotor assembly, a first housing portion, a second housing portion, a coil assembly, and a brush box. The rotor assembly is coupled to the input shaft. The first housing portion is coupled to the second housing portion and the second housing portion is rotatably disposed on the input shaft. The first and second housing portions define a fluid reservoir for receiving the rotor assembly and a viscous fluid, preferably of the magnetorheological type. The coil assembly is coupled to the first housing portion. The brush box is operably coupled to the coil assembly. When the coil assembly is energized by the brush box, a magnetic field is created that acts upon the magnetorheological fluid to vary the torque transfer of the input shaft to the housing and the fan connected thereto. | 11-17-2011 |
20110278123 | CLUTCH ASSEMBLY - A viscous fluid clutch for use as a clutch for a cooling fan for a vehicle , the clutch includes an input shaft, a rotor assembly, a first housing portion, a second housing portion, a coil assembly, and a brush box. The rotor assembly is coupled to the input shaft. The first housing portion is coupled to the second housing portion and the second housing portion is rotatably disposed on the input shaft. The first and second housing portions define a fluid reservoir for receiving the rotor assembly and a viscous fluid, preferably of the magnetorheological type. The coil assembly is coupled to the first housing portion. The brush box is operably coupled to the coil assembly. When the coil assembly is energized by the brush box, a magnetic field is created that acts upon the magnetorheological fluid to vary the torque transfer of the input shaft to the housing and the fan connected thereto. | 11-17-2011 |
20120085613 | SWITCHABLE MAGNETORHEOLOGICAL TORQUE OR FORCE TRANSMISSION DEVICE, THE USE THEREOF, AND MAGNETORHEOLOGICAL TORQUE OR FORCE TRANSMISSION METHOD - The present invention relates to a magnetorheological torque transmission device comprising two device parts separated by at least one transmission gap for transmitting torque, said gap being fillable and/or filled with a magnetorheological material, rotating relative to each other about an axis of rotation, wherein the magnetic circuit system of the torque transmission device comprises at least one permanent magnet having variable magnetization in addition to at least one electromagnet for generating the magnetic flux in at least one part of the transmission gap, wherein the electromagnet and the permanent magnet are designed and disposed such that the magnetization of the permanent magnet can be adjusted by changing the coil current of the electromagnet. The present invention further relates to a correspondingly designed force transmission device. | 04-12-2012 |
20120090938 | APPARATUS FOR TRANSMITTING TORQUE - A device for transmission and/or generation of torque having a driveshaft and having a driven shaft acted upon by field-excited forces of a magnetorheological medium, the driveshaft terminates in a flange in a housing, at least one cylinder is arranged on the flange ( | 04-19-2012 |
20120132494 | ELECTROMAGNETIC FRICTION CLUTCH HAVING OSCILLATING POLE FACES - An electromagnetic friction clutch ( | 05-31-2012 |
20120138407 | TORQUE-LIMITED COUPLING ELEMENT AND METHOD FOR TORQUE-LIMITED COUPLING - A torque-limited coupling element is described, comprising an input part and an output part, each mounted rotatably about a common rotational axis, and at least one connecting means. If a predeterminable limit torque acting between the input part and output part is exceeded, the connection means can be transferred from a first position, in which the connecting means non-rotatably connects the input part and output part to one another forming a positive engagement, into a second position, in which the input part and output part are mounted rotatably relative to one another. Furthermore, a method for torque-limited coupling and uses for such a coupling element are described. The invention is characterized in that the at least one connecting means is, in the first position, non-positively operative connected, indirectly or directly, to a displacement body movably mounted inside a chamber filled with a magnetorheological fluid, with the position of the displacement body inside the chamber being supported by a displacement force caused by the magnetorheological fluid, a unit generating a magnetic field is provided on or in the region of the chamber and can be used to influence the displacement force of the magnetorheological fluid, and, if the limit torque is exceeded, the displacement body can be deflected inside the chamber against the displacement force caused by the magnetorheological fluid. | 06-07-2012 |
20130175132 | MAGNETORHEOLOGICAL TRANSMISSION DEVICE - Magnetorheological transmission device and method for influencing the coupling intensity of two components, which can be coupled and whose coupling intensity can be influenced. A channel is provided, which contains a magnetorheological medium with magnetically polarizable particles, which can be influenced by a magnetic field. A magnetic field generating unit generates a magnetic field in the channel in order to influence the magnetorheological medium in the channel. A body is disposed in the channel. A free distance between the body and the component is at least ten times greater than a typical mean diameter of the magnetically polarizable particles in the magnetorheological medium. A space with magnetorheological medium is disposed between the body and a component. The magnetic field is applied to the region in order to optionally chain together the particles and/or wedge or release them with the body. | 07-11-2013 |
20130213756 | FLUID BRAKE DEVICE AND VALVE TIMING CONTROL APPARATUS HAVING THE SAME - A housing forms a fluid chamber in an inside of the housing. A magneto-rheological fluid includes a plurality of magneto-rheological particles dispersed in the magneto-rheological fluid and is filled in the fluid chamber. A partition structure partitions the fluid chamber between a radially outer region, in which the magnetic portion is exposed, and a radially inner region, which is located on a radially inner side of the radially outer region in a radial direction of a rotatable brake body, during rotation of the rotatable brake body. | 08-22-2013 |
20130341145 | MAGNETO-RHEOLOGICAL FLUID AND CLUTCH USING THE SAME - A magneto-rheological fluid includes: a magnetic particle mixture; and a dispersion medium in which the magnetic particle mixture is dispersed. The magnetic particle mixture includes first magnetic particles and second magnetic particles. The first magnetic particles have an average particle size greater than or equal to 1 μm and less than or equal to 50 μm. The second magnetic particles have an average particle size greater than or equal to 20 nm and less than or equal to 200 nm, and have surfaces provided with a surface modified layer. A proportion of the second magnetic particles in the magnetic particle mixture is greater than or equal to 2 wt % and less than or equal to 10 wt %. | 12-26-2013 |
20140299434 | MAGNETO RHEOLOGICAL CLUTCH - A clutch assembly includes an input shaft, an output shaft, at least one first friction plate mounted to the input shaft, and at least one second friction plate mounted to the output shaft and spaced apart from the at least one first friction plate. The clutch assembly also includes a rheological fluid positioned between the at least one first friction plate and the at least one second friction plate, and a fluid activator configured to increase a viscosity of the rheological fluid to provide increased torque transfer from the at least one first friction plate to the at least one second friction plate. | 10-09-2014 |