27 March 2012 Realization of a MRF-safety-clutch for high torsional moments based on a novel ball-clutch design
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This paper describes the development of a safety-clutch by using magnetorheological fluids (MRF) to switch the transmission torque between a motor and a generator in a bus-like vehicle. The clutch is based on a new design combining an axial MRF-actuator and a ball coupling mechanism. This so called "MRF-ball-clutch" avoids the disadvantages of traditional bell- or disc-MRF-clutch designs where the torque is transmitted by the MRF which leads to a self-heating due to the shearing forces in the fluid and a more or less significant drag torque caused by limitations of the relation between minimal and maximal transmittable torque. The safety clutch based on the new MRF-clutch design requires a minimum of power consumption and allows switching high torsional moments in a very compact, lightweight and robust design. The work was done within the Fraunhofer System Research for Electromobility FSEM, founded by the German Federal Ministry of Research and Technology.
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M. Matthias, M. Matthias, B. Seipel, B. Seipel, M. Jackel, M. Jackel, J. Kloepfer, J. Kloepfer, "Realization of a MRF-safety-clutch for high torsional moments based on a novel ball-clutch design", Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83410P (27 March 2012); doi: 10.1117/12.905875; https://doi.org/10.1117/12.905875

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