Influences of lubrication flow rates on critical speed of rub-impact at high circumferential velocities in No-Load multi-plate wet clutch

The induced mechanism of rub-impact at high circumferential velocities in the multi-plate wet clutch is very complex and has not yet been clarified. Compared with the single-plate wet clutch, the coupling motions between friction plates and steel plates are taken into consideration to establish the fluid-solid coupling model. Then, the impact characteristics of friction pairs under three different lubricating flow rates are analyzed to reveal the action mechanism of the flow rate on the rub-impact drag torque. Through this research, it can be found that: The flow rate of lubricant has a negative effect on the occurrence of rub-impact while it has a positive effect on the value and growth rate of drag torque at high circumferential velocity.