A gear microscopic surface pitting lubrication model is established

and the oil condition which joined the non-newtonian and thermal factor is introduced.Based on the multi-grid method

a numerical solution of spur gear node lubrication is obtained.The result show that at full and starved conditions

for the node of gear under three conditions of Newton constant temperature

Newton variable temperature

non-Newtonian variable temperature

with the viscosity increases

the pressure distribution has no obvious change.Under the Newton variable temperature condition

the second pressure peak decreases gradually.Under the nonNewtonian variable temperature condition

the center film thickness and film thickness distribution increases with the viscosity.