Drag torque modeling at high circumferential speed in open wet clutches considering plate wobble and mechanical contact

A mathematical model is established to predict the drag torque increment due to the mechanical contact at high circumferential speed in open wet clutches. The fluid hydrodynamic actions are coupled simultaneously with the kinematic position of the tilted friction plate. The drag torque due to mechanical contact at high speed is estimated by presenting a rigid-body impact model. The calculation results are validated by experiments performed on an open multi-plate wet clutch test rig. The model calculation demonstrates that the drag torque also becomes higher with larger flow rates of lubricant at high circumferential speed.