consider the gearbox shaft connected to the coupling length

Conventional wind turbine bearings configured for dual bearings. According to the working principle of wind turbines, transmission chains usually designed as follows: spindle, gear box (growth container) and generators. On the spindle, take double bearing configuration is the more traditional and more common form, using the bearing type according to the design requirements vary, but typically configured for more traditional bearings spherical roller bearings or tapered roller bearings configuration configuration.
Double bearing arrangement has the advantage of spindle bearings to withstand wind loads of the most complex, in addition to torque, but basically no other loads are passed to the drive chain gear box, gear box design to bring a great convenience. However, this configuration also has its own disadvantages, such as long chain drive, in addition to the length of the spindle, but also consider the gearbox shaft connected to the coupling length. Thus, in a low-power wind turbines, this configuration is relatively common. In the wind power generator, the long drive chain means that a larger volume, and higher bearing manufacturer costs.
Spindle bearing arrangement is the latest solution for a single bearing support. With the development of wind turbines, high-power wind turbines to become the development trend of the market, higher energy density also become the host of manufacturers competing to catch up with the target, to bearing design has brought great challenges.
Wind turbines in the power, to ensure that there is sufficient load capacity to withstand greater wind loads. Thus, the spindle, including the bearing size is bound to increase, which will result in an increase in the overall weight of the host, the attendant is the host-related components, including the tower and other parts of the manufacturing cost increases. So if there is able to improve wind turbine power while reducing weight and reduce the manufacturing cost of the entire wind turbine it? This became the host vendors and component manufacturers are facing an increasingly urgent problem, because the decrease in cost means to improve product competitiveness. For the above purpose, SKF developed specifically for high-power wind turbines large contact angle of tapered roller bearings.