Fourth, the wind turbine wind turbine bearing assembly of the domestic market bearing annual demand:

To dress up with a traditional band bearing gearbox unit as an example calculation asynchronous alternator wind generator clutch bearing assembly Packing:
(A) yaw bearing (four-point contact ball slewing bearing) 1 set
(2) pitch bearing (four-point contact ball slewing bearings) 3 sets
(3) generator bearings (deep groove ball bearings, cylindrical roller bearings) 3 sets
(4) spindle bearing (self-aligning roller bearings) 2 sets
(5) gearbox bearings (deep groove ball bearings, cylindrical roller bearings, full complement cylindrical roller bearings, double row tapered roller bearings, spherical roller bearings, spherical roller thrust bearings, four point contact ball bearing) accelerator has three structural forms, were installed bearings: the first 15 sets, 18 sets of the second, and the third 23 sets.
The wind turbine bearings were first 9 +15 = 24 sets, the second 9 +18 = 27 sets, the third 9 +23 = 32 sets. Estimated time averaged 26 sets.
According to an annual increase of 10 million kilowatts installed capacity, ie 10,000 MW basis, the annual need to add 1.5 MW wind turbines about 6,700 units, to be bearing more than 170,000 units, including large four-point contact ball slewing bearing approximately 27,000 units .