ESTIMATING THE TORQUE DISTRIBUTION IN A PLANETARY GEARBOX

Abstract

In the case where one intends to reveal the torque distribution onto the elements of a planetary gearbox, issuing a virtual model is previously needed. This model should replicate both the physical structure and the real working behavior. The torque is transmitted along the gearbox through the intermediary of three simple planetary mechanisms by successively locking different components with the aid of some multi-plate clutches. The simulation of the friction element’s engagement is achieved by introducing a physical signal that replaces the pressure of the hydraulic command system. The pressure evolution has been previously experimentally determined, during the vehicle’s taking-off procedure. The friction elements are modeled considering their three working stages: fully disengaged, partially engaged and fully engaged. The torque distribution is modeled starting from the energy conservation law as well as the torque balance law.