Strength analysis of pin-bolt connection in wind turbine gearbox
The connection mechanism between the main shaft and gearbox plays a very important role in the transmission chain of wind turbines,although pin-bolt connection is increasingly adopted,few research has focused on the corresponding ultimate and fatigue strength during the torque transmission.Therefore,a finite element model was established to evaluate the ultimate strength and fatigue strength of the pin-bolt connection.Firstly,a finite element model including the pin sleeve,bolt,main shaft and gearbox was established.Then,the ultimate strength of each component was verified and the stress situation of the structure under different torques was analyzed.Finally,a method for calculating structural fatigue strength considering nonlinear stress conditions was also proposed and the fatigue strength of the structure was verified.The research results indicate that torque transmission in pin-bolt connection can be divided into three stages.The first stage is the torque transmission of the outer bolt.The second torque transmission stage relates to the outer pin sleeve and inner bolt.The third torque transmission stage relates to the outer pin sleeve and inner pin sleeve.Since a significant nonlinear relationship between the load and stress is present during the torsion transmission,nonlinearity needs to be considered in the analysis of structural fatigue strength.The highest stress and fatigue occur in the hole of main shaft side,the stress is 553 MPa and the fatigue value is 0.135 5,therefore in structural design,the strength of the main shaft interface is key in ensuring the reliability of the connection.
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