Development of an analytical model for prediction of drag torque characteristics of disengaged wet clutches in high speed region

Paper #:
  • 2017-01-1132

  • 2017-03-28
The drag torque characteristics of a disengaged wet clutch at high speed region (6000~20000rpm) shows a significant torque rise. A high drag torque increases the emission of CO2 and fuel consumption. Moreover, in high speed region, fluttering of friction disk, chipping and delamination from friction disk are observed. Therefore, it is important to understand the physics behind the torque jump up at high speed region. Several theoretical models have been presented by the researchers describing the drag torque characteristics at lower clutch speed. However, very little study has been made on the drag torque behavior at very high clutch speed. Our previous analytical model can predict the drag torque characteristics but unable to capturing the high speed region. The physics of significant drag torque rise at high speed operating condition remains unexplained till date. In this research, we have developed a model to predict the drag torque characteristics for high speed region. Moreover, we have explained the tentative reasons for drag torque jump up. We presented an analytical correlation of torque jump up with the excessive decrease of local static pressure and assumed that vacuum formation is the possible reason of high speed torque rising and associated vibration. Result shows that when the separator plates are free, a remarkable torque jump is observed. However, the drag torque jump up at higher speed can be eliminated by fixing the separator plates by some means. We have validated the model with test results and the comparison result shows that they are very close to each other. The significance of this research is, the model can predict the drag torque characteristics without making sample and conducting tests in high speed region. Moreover, the model will give the basic understanding and parameter for developing new grooves to reduce the rising of drag torque up to 20000rpm.
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