As a clean energy source that does not produce carbon dioxide, which can cause the greenhouse effect, wind power is rapidly becoming popular in countries around the world.

Large wind turbines (windmills) are giant machinery, and many 2MW wind power generation equipment under construction now has a windmill blade length of about 40 meters, 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 windmills must also be large, with an inner diameter range of 100 mm to 700 mm, and some models require bearings with an inner diameter of nearly 2 meters. There are only six manufacturers in the world that can steadily supply such large bearings to the market, including NSK. The wind turbine industry is now a global development industry, therefore, in addition to bearing manufacturing, but also in the world's main outlets for marketing activities and technical services, these are important conditions.

Wind power bearing is a special bearing, the use of harsh environment, high maintenance costs, high life requirements.

Main features

1. Bad use environment

2. High maintenance cost

3. High life expectancy

Generally only a part of the roller of the running bearing bears the load at the same time, and the area where this part of the roller is located is called the bearing bearing area. The load borne by the bearing and the size of the operating clearance will have an impact on the bearing area. If the bearing area is too small, the roller is prone to slip in actual operation. For wind power gearbox, if the design of the spindle adopts a two-bearing support scheme, then theoretically only torque is transmitted to the gearbox. In this case, after a simple force analysis, it is not difficult to find that the load borne by the planetary support bearing is relatively small, so the bearing bearing area is often relatively small, and the roller is prone to slip.

Two single-row tapered bearings or two full roller cylindrical bearings are generally used in the design of wind power gearbox.

We can improve the bearing area by properly pretightening tapered roller bearings or reducing the clearance of cylindrical roller bearings.