In our travels, in addition to the high-speed rail running fast, we often see wind turbines, that is, windmills. Wind power is a clean energy source with broad prospects in the future, but its prospects have also withstood many real-world problems. Wind turbine gearboxes are the most critical part of wind turbines and are the most vulnerable parts during service. This issue introduces an example of damage to the gearbox of a foreign wind turbine for your study. basic situation: Wind power gearbox bearings are damaged within two years of use, which is a typical early failure. The power of the wind turbine gearbox is 1250kW. The output speed is 1500 rpm. Figure 1. A failed medium-speed shaft bearing. This is a typical cylindrical roller bearing. Figure 2 Damaged medium-speed shaft pinion, the gear teeth have been broken, and the adjacent gear teeth have peeling damage, but it is not serious. Figure 3 Schematic diagram of cylindrical roller bearing Figure 4 The surface of the roller is worn, the damage is serious, and the surface is severely peeled off. Figure 5 Damage to the outer ring of the bearing Figure 6 Damaged roller, most of the rollers are damaged, and the damage is relatively random. Figure 7 Damage to the inner ring of the bearing, mainly peeling damage Figure 8 Chemical composition of bearing material Figure 9 Metallographic structure of bearing material Figure 10 Bearing surface wear and corrosion products Figure 11 Observing fatigue and cleavage fracture Figure 12 Observing the cleavage fracture Figure 13 High cycle fatigue and brittle fracture The main cause of bearing damage is high cycle fatigue, which is caused by continuous peak power generation during the strong wind season, causing continuous bearing overload, resulting in bearing surface wear, and at the same time, fatigue cracks are generated on the surface or subsurface, resulting in surface peeling damage. In general, the end bearings of wind turbine gearboxes generate heat during high-load operation, which can affect the lubrication effect and even accelerate the wear and tear, resulting in peeling damage on the roller surface. After the bearing wears, the operation of the shaft will be affected, which will also affect the stress state of the gear. The most common phenomenon is that the eccentric load is observed from the gear, and the gear teeth are broken. The problem usually occurs on the bearing, the medium speed shaft. The root cause of the pinion gear breaking is the damage of the bearing. Lvl Wooden Bed Slats,Packing Furniture Scaffolding,Pine Veneer Lvl, Door Core Material Lvl RILICO , https://www.rilico.com
