Bearing’s application analysis of wind turbine gearbox
The wind turbine gearbox is a very important part of the Draught Fan. Due to the constant impact from variable load and strong gust, it is different from the common gearbox in design,manufacture and maintenance. And with the improving of the Draught Fan’s design power, wind power gear box on the premise of meet the load, the volume must be as small as possible, the weight must be as light as possible, but still to reach more than 20 years service life. The domestic and international application shows that the bearing is one of the weakest link in all parts of wind turbine gearbox. This paper will take the most common wind power gear box design as an example to introduce how to improve the reliability of wind power gear box by analyzing the application of bearing.
Analysis of bearing area of wind power gearbox bearing:
In the roller of the bearing, there is usually only one part of the roller bearing the load, and this part of the roller is called the bearing area of the bearing. If the bearing area is too small,the rollers are prone to skidding during actual operation. At present, in the design of wind turbine gearbox, two single row tapered roller bearings or two schemes with full roller bearings are used. The bearing area can be improved by means of proper pre-tightening of tapered roller bearings or by reducing the clearance of cylindrical roller bearings, as shown in figure 1.
This method solves the problem of pitting and peeling of ball bearing in traditional ball bearing and cylindrical roller bearing. However, it should also be noted to prevent single column load. In this case, conical bearings with different cone angles can be considered for mating use, as shown in figure 2.
In conclusion, the analysis of the bearing area of bearing can understand the running state of bearing well, so as to optimize the selection of bearing and perfect gear box design.
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