Gearbox (Gear Speed Reducer for Wind Turbines)

Superior Performance
The NB700L4 yaw drive gearbox and pitch drive gearbox are used for different components of wind energy plants. This gear speed reducer for wind turbines is primarily responsible for the transmission of the rotor and the nacelle. Our slewing planetary gear units from the yaw and pitch range are normally used to control blade pitch for the turbines. The nacelle at the top of the tower is connected to the rotor and houses the gearbox, the electrical generator, the yaw system, and the control system. To make sure that the rotor axis is constantly aligned with the wind direction for maximum energy output, large wind turbines are equipped with a yaw system that allows the nacelle to adjust its position according to the direction and force of the wind. Nacelle rotation is controlled by a yaw system, planetary gear unit with electric brake motor.

Each wind turbine must have between two and six gear units, depending on the size, and the motor can be electric or hydraulic. Two or three-stage gear units, combined with a worm gearbox on the input side, or four or five-stage gear units from the yaw and pitch drive series are normally used. Output pinions can be integrated or inserted.

Key Features
1. Output torque range: 1000-80000 N.m
2. Gear Ratios: i=300-2000
3. Support: slew support (with flange mounted)
4. Electric Brake: DC and AC type
5. Output shaft: splined or with integral pinion; output shafts supported by heavy duty capacity bearings
6. Applicable motors: IEC electric motors

Product Identification Scheme
1 2 3 4 5 6
NB 706 L 4 1671 IEC80B5

1. NB: Ningbo planetary gearbox
2. 706: Gearbox size, 700, 701, 703…715
3. L: L series slew drive
4. 4: Number of stages, 4…four stage
5. 1671: Ratio
6. IEC80B5: Motor type

Type Nominal Output Torque (N.m ) Peak Static Output Torque (N.m ) Ratio (i)
NB700L 1000 2000 297--2153
NB701L 2000 4000 297--2153
NB703AL 2500 5000 278--1866
NB705AL 5000 10000 278--1866
NB706BL4 8000 15000 203--2045
NB707AL4 12000 25000 278--1856
NB709AL4 18000 30000 278--1856
NB711BL4 35000 80000 256--1606
NB710L4 25000 50000 329--1420
NB711L4 35000 80000 256--1606
NB713L4 50000 100000 250--1748
NB715L4 80000 140000 269--1390
Specific Dimensions and Technical Parameters Inquiry
NB700L4 Series

Alternative Brand/Model Inquiry
Trasmital Bonfiglioli Brevini Riduttori Bosch Rexroth Comer Industries Reggiana Riduttori Rossi Zollern
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