1. Analysis of key technical points for fan bearings

1.1 Yaw bearing assembly (660PME047)

The yaw bearing assembly is a guarantee for the fan to track changes in wind direction in a timely manner. Yaw acceleration when the fan starts to deflect ε Will generate an impact torque M=I ε (I is the cabin inertia). The higher the yaw speed Ω, the resulting acceleration ε The larger it is. Due to the large size of I, the already significant impact force is multiplied. In addition, if the fan deflects during movement, the yaw gear will bear a considerable gyroscopic torque, which is prone to fatigue failure of the yaw bearing.

According to the force characteristics of the fan bearing, the yaw bearing adopts a four point contact ball bearing with a "zero clearance" design, and the channel is specially designed and processed to withstand large axial and torque loads. The yaw gear needs to choose appropriate materials, modules, tooth profile, and hardness to ensure the matching of lifespan with the driving gear. At the same time, targeted heat treatment measures should be taken to improve the strength of the tooth surface, so that the bearing has good wear resistance and impact resistance.

The fan is exposed to the wild, so there are strict requirements for the sealing performance of the bearing. It is necessary to optimize the sealing form of the bearing and conduct simulation experiments on the sealing performance of the bearing to ensure that the bearing life and fan life are the same. The fan is installed at a height of 40m, and the installation and dismantling costs are expensive. Therefore, it must have very high reliability, generally requiring a service life of 20 years. In addition, the bearing structure is complex, so computer simulation tests must be conducted before the installation test to ensure that the bearing design parameters are correct.

1.2 Blade spindle bearing (24044CC)

The main shaft of the fan blade is supported by two self-aligning roller bearings. Due to the large load borne by the main shaft of the fan blade and the long shaft, which is prone to deformation, it is required that the bearing must have good centering performance.

Determine the internal structural parameters of the bearing and the structural form of the cage to ensure good performance and long service life of the bearing.

1.3 Transmission bearings

There are many types of bearings in the gearbox, mainly lubricated by the gear oil in the gearbox. There are many metal particles in the lubricating oil, which greatly shortens the bearing life. Therefore, special heat treatment processes need to be used to create compressive stress on the surface of the raceway, reduce the sensitivity of the raceway to particle impurities, and improve the bearing life. At the same time, based on the operating conditions of the bearing, the bearing structure is further optimized and designed to improve the bearing processing technology and further improve the performance indicators of the bearing.

1.4 Generator bearings

The generator bearings adopt cylindrical roller bearings and deep groove ball bearings. By designing the structure, improving the processing methods, controlling the cleanliness of the production process, and optimizing the relevant components of these two types of bearings, the noise caused by bearing vibration is reduced, resulting in good low noise performance of the bearings.

Research on 1.5 Bearing Installation Test Technology

The actual performance of a bearing after installation is not only related to its own performance, but also closely related to the specific installation and usage conditions of the bearing. Therefore, it is necessary to study the matching form and installation center of the bearing during installation, so that the bearing can achieve good working performance in actual use.