Abstract
In the wind turbine system, high strength bolt is always used in important joint. For example, whether the bolt between wind turbine tower is safe is one important side of wind turbine protecting. However, the gearbox always loses oil even if wind turbine runs well, even the oil would leak on the bolt joint of each layer. So it is important to analysis the influence of oil-leak to bolt joint. Through analyzing the property of gear oil and the stress situation of bolt in wind turbine tower, the paper obtains the equilibrium formula of bolt joint in different stress situation and the influence of oil to frictionfactor and torque coefficient. At last, making a conclusion about the reson of causing bolt joint loosing when gearbox oil leaks on the bolt joint of wind turbine tower.
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