The Tooth Characteristics Research Of The Slewing Bearing Of Wind-powered Electricity Generation

Due to the shortage of resources, environmental pollution, rise of oil prices andthe fear of nuclear energy applications pollution, today the demands of the societyfor clean, sustainable energy is very strong, therefore, the rapid development of thewind power technology and industry is created. The slewing bearing of wind-poweredelectricity generation which is one of the important components of the wind powerequipment, is made up of the inner ring, outer ring, cage and roller. There is a drivegear on inner or outer ring and can drive torque with the drive pinion.Because theinstallation location is not easy to be disassembled, the cost of the disassembly isrelatively high, and the time of the disassembly is long, therefore, reliabilityrequirements of the slewing bearing of wind-powered electricity generation is verystrict. In general, the life of the slewing bearing of wind-powered electricity generationand wind power generator is consistent, and the life must reach for more than20years.Therefore, the research of wind power bearings, especially the reliability research ofthe process is very important.Due to the slewing bearing of wind-powered electricity generation is a largebearing, the test of its outer or inner tooth is very difficult, and needs a lot of money.The paper tells about FEM work for the slewing bearing of wind-powered electricitygeneration．The paper uses some functions from finite element method software suchas the simulation analysis of contact，temperature field and coupling between stress tofind the change of stress, strain and temperature field in every process. This methodcan be effective to overcome the shortcomings of the test.The detailed works are as followings：(1) The first part is mainly of themechanical analysis of contact in gear working process. Fristly parameter model of theslewing bearing for the contact process is established, which is used to simulate andcalculate of the contact process, then the results of computer simulation are analyzed.Through this process, the distribution of the force in the contact process and the contact force distribution in the tooth surface and the tooth root can be known. Lastcomparison metallographic phase of different gear, the organizational structure of thesoft and hard tooth can be getted, and then through taking the results of the force andmetallographic the pros and cons of gear are analyzed.(2) The second part is thesimulation process of the quenching. This part is the combination analysis of theorthogonal experimental method and finite element analysis. Firstly we need determinethe factors and levels of orthogonal experiment, choose the orthogonal experimenttable. Then we define the boundary conditions of finite element analysis based on thecombination of the factors and levels of the orthogonal experiment table, simulation ofthe temperature field and thermal stress. Finally, we will analyze the simulation resultsby the results analytical methods of the orthogonal experiment, determine thequenching parameter by the results analysis. This process is getting different resultsparameters of the temperature field and thermal stress by the orthogonal experimentalmethod and finite element analysis, then processing results by range analysis oforthogonal experiment, finally，recommending quench parameters according to theanalysis results.