Search for a command to run...
In this research, a brake model utilizing magnetorheological fluid (MRF) is integrated within a planetary gear set to replace the traditional hydraulically actuated disc brake mechanism in automatic transmissions of the passenger car. Firstly, the proposed brake model was initially designed and validated using commercial software tools. The structure of the new brake not only allows for flexible torque adjustment based on operational requirements but also contributes to enhanced shift control efficiency, reduced latency, and improved power transmission capability. Then, the new model is designed to simulate factors that affect braking torque, including the magnetic flux density in the active region, the working area of the working gap (area), the direction and magnitude of the excitation current supplied to the magnetizing coil, and the influence of magnetic core materials. Subsequently, the proposed model was dimensionally optimized through simulations of influencing factors. Further, the simulation results were conducted using two commonly used materials ST1008 and ST1010 demonstrate significant differences in their ability to generate braking torque. Finally, a fully detailed design for an MRF-integrated planetary-gear brake was completed. Furthermore, the combination of excitation current and magnetic core material significantly affects magnetic saturation, which in turn influences the controllability of the braking torque. The proposed brake model generates approximately 51 Nm of torque, thereby delineating its feasible operational range. Although the proposed model has been primarily validated through simulations by commercial software, the obtained results provide a crucial scientific and technical foundation for subsequent research and prototype development.