A final drive device for torque vectoring in small racing cars

Sammanfattning: The agility of the car can be improved by distributing the longitudinal tire forces unevenly between the wheels. The resulting yaw moment helps the car to steer in transient driving scenarios, like on a slalom course. The available grip in steady state cornering can also be increased along with stability. The goal in this project is to develop a final drive device for torque vectoring in a small racing car in order to make it faster around the race track. It is shown that torque vectoring can improve the usable tire grip. Different differential concepts, both passive and active, are presented and discussed. The torque vectoring concepts are rated according to suitability in a Formula Student car, and two alternatives of a dual clutch concept are chosen for further analysis. A lap-simulation program is used to evaluate if the concepts are feasible to use in a race car, and to quantify requirements for torque capacity, and cooling. A system requirements specification is created and a design is developed in a 3D-CAD program. The performed analysis for clutch dimensioning, cooling capacity and structural finite element analysis is presented. The remaining work is presented and discussed in the end.