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Class Information
Number: 192/21.5
Name: Clutches and power-stop control > Field responsive frictional media type
Description: Devices wherein torque is transmitted or absorbed between two relatively movable members having a medium there between and wherein the frictional characteristics of the medium are (1) augmented by, or (2) altered in response to a change in, a magnetic or an electrostatic field set up between the two members.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8678153 Twin-clutch device Mar. 25, 2014
8640840 Torque converter using magnetic viscous fluid as working fluid Feb. 4, 2014
8547191 Damping device capable of providing increased stiffness Oct. 1, 2013
8527168 Method and device for ascertaining a rotational speed parameter for determining a setpoint torque Sep. 3, 2013
8392076 Control device of vehicular automatic transmission Mar. 5, 2013
8235195 Engine clutch and method of using same Aug. 7, 2012
8215467 Multi-gap magnetorheological fluid clutch Jul. 10, 2012
8127907 Marine transmission using rheological fluids Mar. 6, 2012
8100238 Magnetorheological clutch Jan. 24, 2012
8056687 Apparatus with active material surface in contact with rheological fluid and method of enhancing performance thereof Nov. 15, 2011
8016092 Magneto-rheological clutch and wheel transmission apparatuses and methods Sep. 13, 2011
7999429 Power transmission apparatus Aug. 16, 2011
7891474 Magneto-rheological brake-clutch apparatuses and methods Feb. 22, 2011
7870939 Magnetorheological clutch Jan. 18, 2011
7828129 Magnetorheological clutch having lamination bands Nov. 9, 2010
7690487 Vehicle differential including pump with variable engagement clutch Apr. 6, 2010
7588131 Magnetorheological clutch Sep. 15, 2009
7553132 Micro device incorporating programmable element Jun. 30, 2009
7490707 Magnetorheological fan coupling Feb. 17, 2009
7467697 Electromagnetic coupling device for engine accessories Dec. 23, 2008
7461731 Magnetorheologic clutch Dec. 9, 2008
7422093 Magneto-rheological coupling Sep. 9, 2008
7364025 Magnetorheological fan coupling Apr. 29, 2008
7334670 Torque vectoring differential for controlling vehicle stability Feb. 26, 2008
7325663 Magnetorheologic clutch Feb. 5, 2008
7311185 Method for thermal management for a controllable viscous fan drive Dec. 25, 2007
7306083 Magnetorheological fluid device Dec. 11, 2007
7243768 Clutch having a variable viscosity fluid Jul. 17, 2007
7216723 Pulse torque generator and power tool having the same May. 15, 2007
7137496 Parallel field electrode configurations for electrorheological fluid applications Nov. 21, 2006
7083030 Torque transfer coupling with magnetorheological clutch actuator Aug. 1, 2006
7070032 Hydrodynamic coupling apparatus Jul. 4, 2006
6991576 Magnetically responsive limited slip differential Jan. 31, 2006
6988602 Torque transfer coupling with magnetorheological clutch actuator Jan. 24, 2006
6942081 Electrorheological clutch Sep. 13, 2005
6932204 Power transmission device for a four-wheel drive vehicle Aug. 23, 2005
6883655 Variable torsional damper having magneto-rheological fluid damping in parallel with a spring damper Apr. 26, 2005
6857364 Clutch for drive elements of a printing machine Feb. 22, 2005
6854573 Brake with field responsive material Feb. 15, 2005
6837350 Lightweight magnetic particle device Jan. 4, 2005
6802283 Engine cooling system with variable speed fan Oct. 12, 2004
6755290 Power transmission device for a four-wheel drive vehicle Jun. 29, 2004
6736758 Variable torsion converter May. 18, 2004
6732529 Off loading clutch for gas turbine engine starting May. 11, 2004
6725990 Torque transfer clutch with magnetorheological actuator and ball screw operator Apr. 27, 2004
6712730 Active torque bias coupling Mar. 30, 2004
6684994 Electrostatic devices for mechanical blocking Feb. 3, 2004
6648115 Method for slip power management of a controllable viscous fan drive Nov. 18, 2003
6634344 Controlled engagement of supercharger drive clutch Oct. 21, 2003
6623399 Traction fluids Sep. 23, 2003

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