FEM thermal analysis of a semi-active differential

A semi-active differential (SAD) is a device which allows the flaws of a standard limited slip differential (LSD) to be overcome in terms of how they affect vehicle dynamics. This is possible by controlling continuously the locking percentage. A thermal analysis of a semi-active differential (SAD) is presented. An internal electro-hydraulic clutch produces a resistant torque in the analysed device, therefore, the locking percentage is highly influenced by temperature. Steady and transient conditions are evaluated under various conditions of actuation system pressure and relative rotational velocity between the clutch’s discs. The radial and axial temperature distribution together with the temperature gradient along the contact surfaces generating friction have been characterized, including the case of a duty cycle.