QI Tao，DONG Shu-yan，SU Feng-yu

（Xuchang XJ Group Wind Power Technology Company ，Xuchang 461000，China）

Abstract：Aiming at the design problems of the bolt connection strength of hub and pitch-bearing of a MW wind turbine，the ANSYSsoftware was utilized to establish the simulated model of this bolt connection. With the study of pitch-bearing force analysis and FEM modeling method of bearing and bolt，the strength analysis of this bolt connection and the contact surface slip verification were calculated by the FEM method and theoretical method respectively based on the GL specification. The results indicate that this bolt connection satisfies the design requirement and the two maximum bolt stresses are almost the same and the slip which transfers shear force do not occur on the contact surface between pitch-bearing and hub. The results can provide some references for the bolt connection of hub and pitch-bearing。

Key words：pitch-bearing；hub；bolt connection；strength analysis