Mathematical Model and Experimental Evaluation of Drag Torque in Disengaged Wet Clutches

Table 3

The relationship between the ATF temperature, ATF dynamic viscosity, peak drag torque, and critical speed.

Temperature (°C)	Dynamic viscosity (Pa⋅s)	Peak drag torque (Nm)	Critical speed (rpm)
40	0.027=𝜇-1=𝑋	70=𝑌	625=𝑆
60	0.017=𝜇-2=0.7𝑋	48=0.7𝑌	500=0.80𝑆≈√(𝜇-2/𝜇-1)𝑆
80	0.012=𝜇-3=0.5𝑋	35=0.5𝑌	450=0.72𝑆≈√(𝜇-3/𝜇-1)𝑆