Through taking the gear tooth surface contact pattern as a straight judgment

the TE and dynamic response of the gearbox bearing case as a theory judgment

with the help of contact analysis of the loaded gear

the simulation design and the test of the vibration noise are carried out.On the basis of the comparing of simulation result with test result

the modifcation optimization of the existing gearbox is accomplished.The noise of whine producing by gear is reduced

a feasible method for solving the problem of automible gear whine is proposed.