Yaw Bearing

Generally, the structure of yaw bearings for wind turbine is single row ball slewing ring,four-point contact bearing.
The yaw bearings install into the joint between tower and cabin, the pitch bearing installed into the joint between the blades and hubs. Each wind turbine has a set of yaw bearing and three sets of pitch bearing.
Three types of this kind of single row ball slewing bearings(yaw bearing):
A. Without gear bearing (non tooth)
B. External gear bearing (external tooth)
C. Internal gear bearing (internal tooth)

Without gear yaw bearing   External gear yaw bearing  Internal gear bearing
                                  A                                                                              B                                                                       C