Weight and Space Saving Design of Energy-Efficient MRF-based Clutches for Hybrid Powertrains

摘要

The requirements for transmission and coupling elements in hybrid powertrains are rising continuously. Our previous investigations were focused on the elimination of viscous induced drag torques in switch elements based on magnetorheological fluids by a MR-fluid movement control. MRFs are highly qualified for the utilization in powertrains considering their particular characteristics of changing their apparent viscosity significantly under influence of a magnetic field by fast switching times and a smooth torque control. In this contribution a further developed design of the magnetic circuit will be presented to reduce the weight and space requirements of energy-efficient MRF-based actuators. These requirements are satisfied by a serpentine flux guidance resulting also in a reduction of the excitation energy. A simulation of the transient torque transmission shows fast response times of the novel design. Due to the new design of the magnetic circuit it is also possible to create novel, space-saving combinations of a MRF-based brake and clutch and a well-defined torque transmission.