Yaw and Pitch bearings

Generally, yaw and pitch bearing usually adopt the structure of single row four-point contact ball bearing and double row four-point contact ball bearing. And both these two types of bearings can be further divided into bearings without gears, bearings with internal gears, bearings with outer gears according to gear position.

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Technical requirement of Yaw and Pitch bearings for wind turbine:

1. Material and heat treatment

Rolling elements in yaw and pitch bearing are made of GCr15 or GCr15SiMn bearing steel according to GB/T 18254-2002. The heat treatment of bearing steel should comply with JB/T1255-2001. Other materials with comparable or better performance can also be used. The material of rings in yaw and pitch bearing usually use 42CrMo that comply with GB/T30771999 standards or other materials which meet the performance requirements. The low-temperature impact energy requirement of the ring is -40℃AKV, not less than 27J.

The flaw detection of the ring of the yaw and pitch slewing bearing is not lower than the level II requirements in the GB/T7736-2001 standard. After quenching and tempering, the hardness of ring is 229HB-269HB or determined by negotiation between the supplier and the buyer. The quenching hardness of the raceway surface is 55HRC-62HRC.

The width of the soft belt of the yaw and pitch slewing bearing should not be greater than the diameter of the plunger hole plus 35mm. The soft belt should generally be placed in the raceway position of the plunger hole.

2. Ring gear of the yaw and pitch slewing bearing

Ring gear in the yaw and pitch slewing bearing is mainly involute cylindrical gear with gear radial modification coefficient X=+0.5. Gear module should meet the regulations in GB/T1357-1987 standard. The accuracy of gear should not be lower than the requirements of 998GK in GB/T10095.1-2001 regulations.

3. Clearance

Generally the radial and axial clearance of yaw bearing is 0-50μm, and the clearance can be adjusted according to the customer requirements.

The radial and axial clearance of pitch bearing is lower than 0.

4. Lubricating oil hole

The yaw bearing and pitch bearing are lubricated through lubricating oil hole, which is screw hole with the specification of M10×1.

5. Seal

For the yaw bearing and pitch bearing in wind turbines, the seal generally use NRB material which comply with HG/T2811-1996. ZYS uses the sealing ring of well-known foreign brands with good performance and reliable quality for our yaw bearing and pitch bearing.

Because the wind turbine is exposed to the wild, there are strict requirements on the sealing performance of the yaw bearing and pitch bearing, and the seal form of the bearing must be optimized to ensure that the bearing life is the same as the wind turbine. Wind turbine are installed at an altitude of more than 50m or even hundreds of meters, and the cost of assembly and disassembly is expensive. Therefore, they must have very high reliability. Generally, they require 20 years of life. In addition, the bearing structure is complicated, so the requirements for design and manufacture of yaw bearing and pitch bearing are extremely high.

6. Spacer and cage

ZYS yaw bearing for wind turbines has spacers that are self-lubricated and can compensate for lubrication when lubrication oil is unevenly distributed in order to maintain best lubrication status between balls and groove contact areas.

ZYS pitch bearing for wind turbines uses integrated steel cage which has simple structure and can save space. It also can accommodate more balls to increase load capacity. Compared with traditional segmented cage, integrated cage is easier to assemble and more stable and reliable during operation.

7. Preservative treatment

For the yaw bearing and pitch bearing, all surfaces except the groove and gear should be applied thermal spraying anti-corrosion treatment according to the regulations in GB/T9793-1997 and GB/T8427-1996. When applied zinc coating, the thickness of anti-corrosion layer shall be no less than 160μm. Other anti-corrosion treatment can be applied to meet the performance requirements of the machine.

Basic code			Dimension of single row four point contact ball slewing bearing									Gear parameter		External gear		Internal gear
Without gear	Outer gear	Inner gear	D	d	T	D1	d1	dn	n	H	h	b	m	Da	Z	da	z
010.30.560	011.30.560	013.30.560	662	458	80	626	494	18	20	70	10	60	5	689	135	427	86
010.30.560	012.30.560	014.30.560	662	458	80	626	494	18	20	70	10	60	6	688.8	112	428.4	72
010.30.630	011.30.630	013.30.630	732	528	80	696	564	18	24	70	10	60	6	772.8	126	494.4	83
010.30.630	012.30.630	014.30.630	732	528	80	696	564	18	24	70	10	60	8	774.4	94	491.2	62
010.30.710	011.30.710	013.30.710	812	608	80	776	644	18	24	70	10	60	6	850.8	139	572.4	96
010.30.710	012.30.710	014.30.710	812	608	80	776	644	18	24	70	10	60	8	854.4	104	571.2	72

010.40.800	012.40.800	014.40.800	922	678	100	878	722	22	30	90	10	80	10	968	94	634	64
010.40.900	011.40.900	013.40.900	1022	778	100	978	822	22	30	90	10	80	8	1062.4	130	739.2	93
010.40.900	012.40.900	014.40.900	1022	778	100	978	822	22	30	90	10	80	10	1068	104	734	74
010.40.1000	011.40.1000	013.40.1000	1122	878	100	1078	922	22	36	90	10	80	10	1188	116	824	83
010.40.1000	012.40.1000	014.40.1000	1122	878	100	1078	922	22	36	90	10	80	12	1185.6	96	820.8	69
010.40.1120	011.40.1120	013.40.1120	1242	998	100	1198	1042	22	36	90	10	80	10	1298	127	944	95
010.40.1120	012.40.1120	014.40.1120	1242	998	100	1198	1042	22	36	90	10	80	12	1305.6	106	940.8	79

010.45.1250	011.45.1250	013.45.1250	1390	1110	110	1337	1163	26	40	100	10	90	12	1449.6	118	1048.8	88
010.45.1250	012.45.1250	014.45.1250	1390	1110	110	1337	1163	26	40	100	10	90	14	1453.2	101	1041.6	75
010.45.1400	011.45.1400	013.45.1400	1540	1260	110	1487	1313	26	40	100	10	90	12	1449.6	118	1048.8	88
010.45.1400	012.45.1400	014.45.1400	1540	1260	110	1487	1313	26	40	100	10	90	14	1607.2	112	1195.6	86
010.45.1600	011.45.1600	013.45.1600	1740	1460	110	1687	1513	26	45	100	10	90	14	1817.2	127	1391.6	100
010.45.1600	012.45.1600	014.45.1600	1740	1460	110	1687	1513	26	45	100	10	90	16	1820.8	111	1382.4	87

010.45.1800	011.45.1800	013.45.1800	1940	1660	110	1877	1713	26	45	100	10	90	14	2013.2	141	1573.6	113
010.45.1800	012.45.1800	014.45.1800	1940	1660	110	1877	1713	26	45	100	10	90	16	2012.8	123	1574.4	99
010.60.2000	011.60.2000	013.60.2000	2178	1825	144	2110	1891	33	48	132	12	120	16	2268.8	139	1734.4	109
010.60.2000	012.60.2000	014.60.2000	2178	1825	144	2110	1891	33	48	132	12	120	18	2264.4	123	1735.2	97
010.60.2240	011.60.2240	013.60.2240	2418	2065	144	2350	2131	33	48	13	12	120	16	2492.8	153	1990.4	125
010.60.2240	012.60.2240	014.60.2240	2418	2065	144	2350	2131	33	48	13	12	120	18	2498.4	136	1987.2	111

010.60.2500	011.60.2500	013.60.2500	2678	2325	144	2610	2391	33	56	132	12	120	18	2768.4	151	2239.2	125
010.60.2500	012.60.2500	014.60.2500	2678	2325	144	2610	2391	33	56	132	12	120	20	2776	136	2228	112
010.60.2800	011.60.2800	013.60.2800	2987	2625	144	2910	2691	33	56	132	12	120	18	3074.4	168	2527.2	141
010.60.2800	012.60.2800	014.60.2800	2987	2625	144	2910	2691	33	56	132	12	120	20	3076	151	2528	127
010.75.3150	011.75.3150	013.75.3150	3376	2922	174	3286	3014	45	56	162	12	150	20	3476	171	2828	142
010.75.3150	012.75.3150	014.75.3150	3376	2922	174	3286	3014	45	56	162	12	150	22	3471.6	155	2824.8	129
010.75.3550	011.75.3550	013.75.3550	3776	3322	174	3686	3414	45	56	162	12	150	20	3876	191	3228	162

010.75.3550	012.75.3550	014.75.3550	3776	3322	174	3686	3414	45	56	162	12	150	22	3889.6	174	3220.8	147
010.75.4000	011.75.4000	013.75.4000	4226	3772	174	4136	3864	45	60	162	12	150	22	4329.6	194	3660.8	167
010.75.4000	012.75.4000	014.75.4000	4226	3772	174	4136	3864	45	60	162	12	150	25	4345	171	3660	147

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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