Gear Speed Reducer for Wind Turbines Planetary Gearbox

Superior Performance

The replacement of the NB700L4 yaw drive gearbox and pitch drive gearbox is 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, a planetary gear unit with an 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

edited by CX

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

Gear Speed Reducer for Wind Turbines Planetary Gearbox Gear Speed Reducer for Wind Turbines Planetary Gearbox

Gear Reducers

World class gear manufacturing capabilities, quality material suppliers, and a state of the art quality process allows EPT to offer the highest level of precision, durability and endurance. The EPT Planetary Reducers are designed and built for advanced high speed low backlash applications. The EPT manufacturing processes allows us to offer exceptional shock load capacities and various mounting options.

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port


Q: Are you trading company or manufacturer ?
A: Our group consists in 3 factories and 2 abroad sales corporations.

Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: How long is your delivery time ? What is your terms of payment ?
A: Generally it is 40-45 days. The time may vary depending on the product and the level of customization. For standard products, the payment is: 30% T/T in advance ,balance before shipment.

Q: What is the exact MOQ or price for your product ?
A: As an OEM company, we can provide and adapt our products to a wide range of needs.Thus, MOQ and price may greatly vary with size, material and further specifications; For instance, costly products or standard products will usually have a lower MOQ. Please contact us with all relevant details to get the most accurate quotation.