As a clean energy that will not produce carbon dioxide that can cause greenhouse effect, wind power generation is rapidly popularized in all countries of the world

Large wind turbines (windmills) are giant machines. Many 2MW wind power generation equipment are under construction now. The blades of the windmills are about 40 meters long, the height of the rotating shaft is 60 to 100 meters, and the total weight is not less than 200 tons. Therefore, the bearings used in the windmill must also be large, with an inner diameter ranging from 100 mm to 700 mm. Some models require bearings with an inner diameter of nearly 2 meters. There are only 6 manufacturers in the world, including NSK, that can supply such large bearings to the market stably. The wind turbine industry is now developing globally. Therefore, in addition to bearing manufacturing, marketing activities and technical services should also be carried out in major outlets in the world. These are important conditions

Wind power bearing is a special kind of bearing, which has a bad service environment, high maintenance cost and high service life

Main features

1. Poor use environment

2. High maintenance cost

3. High service life is required

In general, only part of the rollers of the running bearing bear the load at the same time, and the area where the rollers are located is called the bearing bearing area. The size of the load bearing bears and the size of the running clearance will affect the bearing area. If the load bearing area is too small, the roller is prone to slip in actual operation. For the wind power gearbox, if the design of the main shaft adopts the scheme of double bearing support, theoretically only the torque is transmitted to the gearbox. In this case, after a simple stress analysis, it is not difficult to find that the load of the planet carrier support bearing is relatively small, so the bearing bearing area is often small, and the roller is prone to slip

In the design of wind power gear box, two single-row tapered bearings or two full-roller cylindrical bearings are generally used for the planetary support bearing

We can improve the bearing area by properly preloading the tapered roller bearing or reducing the clearance of the cylindrical roller bearing