Bearing important applications in the wind power gearbox

Proven, bearing one of the wind turbine gearbox weakest parts. Since the wind turbine gearbox and variable loads being perennial strong gusts of impact, so whether it is in the design, manufacture, maintenance should be different from the ordinary or gearbox.
 
With wind turbine design and improve power, wind power gearbox to meet load transmitting premise, the volume must be as small as possible, the weight must be as light as possible. What bearing applications through analysis, to help improve the reliability of wind power gear box, to reduce downtime and improve the reliability of the purpose of wind power gearboxes.
 
Generally, wind speed gearbox input shaft is generally 10-20 rev / min, due to the relatively low speed, causing the input shaft bearing is the planet carrier support bearing oil film formation is often more difficult. The role of oil film bearing operation at the time of separating the two metal contact surfaces, avoid direct metal to metal contact occurs.
 
Introducing a parameter λ to characterize the bearing lubrication (λ is defined as the film thickness and roughness of the two contact surfaces and the ratio). If λ is greater than 1, indicating that the oil film thickness sufficient to separate the two metal surfaces, lubrication good effect; and if λ is less than 1, it indicates that the thickness of the film is insufficient to totally separate the two metal surfaces, the lubricating effect is not ideal. Operation in case of insufficient lubrication, bearings may be damaged.
 
Wind power gear box is generally used ISOVG320 viscosity lubricant circulation, if we find λ is less than 1, can only be improved by reducing the lubrication bearing raceway and roller roughness. In addition, the gear box design, the carrier support bearing to try to avoid an end bearing size is too small, in the practical application analysis, we found that even life to meet the conditions, this design will lead to a small bearing line speed is very low, oil more can not be formed.
 
In roller bearings generally run only part withstand the load, and the area where this part of the roller bearing area we call the bearing. The bearing load size, running clearance will have an impact on the size of the load zone. If the bearing area is too small, the roller in the actual operation is prone to slippage.
 
For wind power gear box, if the spindle is designed with double bearing support program, then theoretically only torque is transmitted to the gearbox. Then, after a simple mechanical analysis, we find that the planet carrier supporting the bearing load is relatively small, so the bearing area of ??the bearing often relatively small, roller prone to slippage.
 
Currently, in the design of wind turbine gearbox carrier support bearings generally use two single row tapered roller bearings or cylindrical bearings two full programs. By appropriately preloaded tapered roller bearings or cylindrical roller bearings reduce clearance methods to improve the bearing area.