Except to support higher titling moment, the wind turbine slewing bearing can also much more complicated fatigued load due to aerodynamic and impeller revolving, additional with the requirements of high reliability and long life, so dynamic support capacity must be considered when in type-selection and designing of the wind turbine slewing ring bearing, mainly for the anti-fatigued life of the roller path.
Type-selection for the wind turbine slewing ring, especially for the variation-impeller slewing ring, is still in discussion. In accordance with installation and application status, it is commonly use the double-row four-contact ball bearing for the variation-impeller bearing, and for the yaw-navigation slewing ring bearing, usually it is using single-row four-contact ball bearing, and also the cross roller bearing but not commonly used.
Quality of the slewing ring bearing is mainly due to quality of its roller path, including machine work quality and heat treatment quality. And quality of the roller path is based on equipment and technique guarantee, so the critical point for assuring quality of the slewing ring bearing is properly selection of equipment and technique.
Wind turbine slewing ring bearing is mainly used in bad environment, so requirements for lubricating, sealing and anticorrosion are strict, by using proper lubricating grease and method, sealing material and structure, anticorrosion technique.
Slewing ringis a kind of large-scale bearing, possessing driving gears in either internal ring or external ring, used for matching gear engagement with driving pinion for driving torgue, in wind turbine, commonly used for pitch and yaw system of wind turbine which endures complex load and is difficult to disassemble, assemble and maintain.Therefore, the wind turbine slewing ring bearing is more strictly in design and manufacture. Generally, life requirement for the wind turbine slewing ring bearing should be as the same as that of the wind turbine unit, and should be more than 20 years.
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