湿式クラッチ分離時における気相流入過程の数値解析

抄録

Reduction of drag torque in disengaged wet clutches is necessary to improve transmission efficiency. The behavior of oil-air flow is important for the drag torque. We proposed a computational model using level set method to track oil-air interface in the wet clutches. Then we validated the predicted drag torque of the clutches by this computation by comparison with Jibin's experiment(1). Consequently, We captured the unsteady oil-air flow and the relationship between drag torque and rotating speed. From the numerical results, it was able to predict the critical angular velocity at which the drag torque begins decreasing. It is found timprohat whether the gas phase penetrates into clutch clearance could be arranged by Weber number with the gap width as the characteristic length and the maximum value of radial velocity calidaas the characteristic speed.