Gearbox bearings and generator bearings for wind turbine

There are many types of gearbox bearings, including deep groove ball bearings, cylindrical roller bearings, full complement cylindrical roller bearings, double row tapered roller bearings, spherical roller bearings, spherical roller thrust bearings and four point contact ball bearings. The bearings in the gear box are mainly lubricated by the gear oil in the gear box. There are many metal particles in the lubricating oil, which will significantly affect the bearing life. Therefore, a special heat treatment process is required to make the raceway surface have compressive stress and reduce the sensitivity of the raceway to particulate impurities and improve bearing life.　At the same time, it is also necessary to optimize the gearbox bearing structure according to the working conditions of the bearing, improve the bearing processing technology, and further improve the gearbox bearing performance index.　

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Generator bearings use cylindrical roller bearings and deep groove ball bearings, angular contact bearings. It is necessary to reduce the noise of generator bearing vibration through the structural design of bearings, the improvement of processing methods, the control of cleanliness in the production process and the optimization of related components, so that the bearings have good low-noise performance.

Working conditions of generator bearings: high speed (1000-1500rpm), high temperature (90-120℃) heavy load.

Grease requirements of generator bearings: excellent shear stability, good oxidation stability, good wear resistance, excellent low temperature bearing start-up performance.

No.	Bearing model	*Dimension dDB*	Structure	WTG model
1	NCF2888V/P5S0	Φ44054060	Full complement single row cylindrical roller bearing	1.5MW speed increaser
2	NCF18/530V/P5S0	Φ53065056	Full complement single row cylindrical roller bearing	1.5MW speed increaser
3	NCF18/670V/P5S0	Φ67082069	Full complement single row cylindrical roller bearing	1.5MW speed increaser
4	23060CA/SOW33	Φ300460118	Self-aligning roller bearing	1.5MW speed increaser
5	22340CA/SOW33	Φ200420138	Self-aligning roller bearing	1.5MW speed increaser
6	NCF18/530V	Φ53065056	Full complement single row cylindrical roller bearing	1.5MW speed increaser
7	NCF28/670V	Φ67082088	Full complement single row cylindrical roller bearing	1.5MW speed increaser

8	NNCF5044CV/C3	Φ220340160	Full complement single row cylindrical roller bearing	1.5MW speed increaser
9	NU1072EM	Φ36054082	Single row cylindrical roller bearing	1.5MW speed increaser
10	NU2326EM/C3	Φ13028093	Single row cylindrical roller bearing	1.5MW speed increaser
11	NU2336M/C3	Φ180380126	Single row cylindrical roller bearing	1.5MW speed increaser
12	NU2338EXM1/C3	Φ190400132	Single row cylindrical roller bearing	1.5MW speed increaser
13	NU326EM/C3	Φ13028058	Single row cylindrical roller bearing	1.5MW speed increaser
14	QJ326N2M	Φ13028058	Four point contact ball bearing	1.5MW speed increaser
15	QJ334N2M	Φ17036072	Four point contact ball bearing	1.5MW speed increaser
16	Z-535808/DF	Φ40054086	Paired single row tapered roller bearing	1.5MW speed increaser
17	NU226EM	Φ13023040	Four point contact ball bearing	1.5MW speed increaser
18	FD-NCF18/710V	Φ71087074	Full complement single row cylindrical roller bearing	2MW speed increaser

19	NNCF5044CV/C3	Φ220340160	Full complement single row cylindrical roller bearing	1.5MW speed increaser
20	NU1072EM	Φ36054082	Single row cylindrical roller bearing	1.5MW speed increaser
21	NU2326EM/C3	Φ13028093	Single row cylindrical roller bearing	1.5MW speed increaser
22	NU2336M/C3	Φ180380126	Single row cylindrical roller bearing	1.5MW speed increaser
23	NU2338EXM1/C3	Φ190400132	Single row cylindrical roller bearing	1.5MW speed increaser
24	NU326EM/C3	Φ13028058	Single row cylindrical roller bearing	1.5MW speed increaser
25	QJ326N2M	Φ13028058	Four point contact ball bearing	1.5MW speed increaser
26	QJ334N2M	Φ17036072	Four point contact ball bearing	1.5MW speed increaser
27	Z-535808/DF	Φ40054086	Paired single row tapered roller bearing	1.5MW speed increaser
28	NU226EM	Φ13023040	Four point contact ball bearing	1.5MW speed increaser
29	FD-NCF18/710V	Φ71087074	Full complement single row cylindrical roller bearing	2MW speed increaser

30	NNCF5060V/P53DRS0	Φ300460218	Paired full complement single row cylindrical roller bearing	3MW gearbox
31	NC18/800v/P53CNLS0	Φ80098082	Full complement single row cylindrical roller bearing	3MW gearbox
32	NJ2334EM/P53DBS0	Φ170360120	Paired single row cylindrical roller bearing	3MW gearbox
33	306/500/P5S0	Φ50067085	Single row tapered roller bearing	3MW gearbox

WIND ENERGY

As a renewable and clean energy source, wind power is rapidly developing all over the world. Large wind turbines are giant machinery. Nowadays, many 2MW wind power plants under construction have wind turbine blades with a length of about 40 meters, a rotating shaft with a height of 60 to 100 meters and total weight of more than 200 tons. Therefore, the bearings used in wind power must also be large, with an inner diameter ranging from 100 mm to 700 mm. Some models require bearings with an inner diameter of nearly 2 meters. Bearings for wind turbines require high reliability, because the bearings are designed to keep the windmill running for 20 years; and when the fault occurs, the parts are not easy to replace (the bearing is used at a long distance from the ground). Bearing manufacturers need to have a high degree of computer analysis technology and exquisite skills in materials and heat treatment, and need to master the test evaluation technology for large bearing.

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Gearbox bearings and generator bearings for wind turbine

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