Home>Bearing knowledge>A new standard analysis of wind turbine bearings

/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131";

Analysis of new specifications for wind turbine bearings

---

/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';

The bearings for wind turbines can be roughly divided into three categories; namely: yaw bearings, pitch bearings, transmission system bearings (spindle and gearbox bearings). The yaw bearing device is at the junction of the tower and the cockpit; the pitch bearing device At the root of each blade and the hub, each wind turbine equipment uses a set of yaw bearings and three sets of pitch bearings (some wind turbines below MW are non-adjustable blades; no pitch bearings are required) ).
1 Code method Wind turbine yaw and pitch bearing code method selected the code method of slewing bearing in JB/T 10471 2004; however, double-row four-point touch ball carousel is presented in wind turbine yaw and pitch bearing Bearing; and the layout bearing code has no rules in JB/T 10471 2004; thus; the code of the double-row four-point touch ball slewing bearing is added in this specification. Because of the layout type code of the single-row four-point touch ball slewing bearing It is indicated by 01; and the layout type code 02 indicates the layout of the double row ball slewing bearing; thus the rule 03 indicates the layout of the double row four point touch ball slewing bearing.
2 Skills demand 2. 1 Data This specification rules the parameters of yaw and pitch bearing ring for 42CrMo; the heat treatment uses the whole quenching and tempering treatment; the hardness after quenching and tempering is 229HB 269HB; the raceway is selected from the surface quenching; the quenching hardness is 55HRC -62HRC. Because the wind turbine yaw and pitch bearing are complicated, and the bearing receives shock and vibration is relatively large; therefore; the demand bearing can not only accept the impact; but also accept the large load. The demand is 20 years; the cost of the bearing device is relatively large; therefore, the demand yaw and pitch bearing life should reach 20 years. The hardness of the bearing ring base is 229HB-269HB; the impact can be accepted without plastic deformation; Some external hardening hardness of the road reaches 55HRC-62HRC; it can increase the number of touch fatigue life; then ensure the use of bearing longevity.
2.2 Low-temperature impact work This specification requires low-temperature impact energy for yaw and pitch slewing bearing rings: 20°CAkv is not less than 27J; Akv value in cold state can be negotiated with the user. Wind turbine can work in extremely cold The area temperature is as low as 40 bar; the operating temperature of the bearing is about 20~C; the bearing needs to accept a large impact load under low temperature conditions; therefore, the data of the required bearing ring is necessary after quenching and tempering Do a low temperature impact test; take a sample on the bearing ring and perhaps the sample with the equal function of the ferrule and the same heat treatment; perform the impact test in the environment of 20~C.
2.3 Bearing ring gear Because the transmission precision of wind turbine bearing is not high; and the ring gear diameter is relatively large; the gear module is relatively large; therefore; the accuracy level of the gear is usually required according to GB/T10095. 2---2001 9th level or 10th level. However, there is an impact between the pinion gear and the bearing ring gear under the working condition; therefore; the tooth surface of the bearing ring gear should be quenched; the pinion tooth surface hardness is usually 60HRC; considering the lifespan number; The hardness of the tooth surface quenching hardness of the gear is not less than 45HRC.
2.4 The clearance yaw and pitch bearings have special requirements in terms of clearance. Compared with the yaw bearing; the impact load of the pitch bearing is relatively large; the blast is also large on the blade; therefore, the pitch bearing is required. The clearance should be zero clearance or a slight negative clearance value; thus, in the case of sensation, the fretting wear of the bearing can be reduced. The yaw bearing demand is a small clearance value; that is, 0-501~m. Because the yaw and pitch bearings of the wind turbine are driven by the drive motor; the bearing should ensure that the drive motor can drive under the negative clearance or small clearance; therefore; the bearing needs no-load measurement after installation to generate the collision torque; The detailed torque value is not the same according to the host drive system.
2.5. Anti-corrosion treatment Wind turbine equipment works in the field; and some of the yaw and pitch bearings are exposed to the outside; they are exposed to atmospheric pollution; the high humidity environment also corrodes the bearing matrix; thus; exposed to the outside The yaw and pitch bearings are required for surface anti-corrosion treatment; usually galvanized treatment is used. According to the demand; the paint is disposed outside the galvanized layer.

---

Recommend to friends comments close window

Bearing related knowledge

SKF bearing production process The necessity of timing inspection of SKF bearings Four methods for determining NSK rolling bearings: "Precautions for removing imported bearings" Common sense analysis of the data used in bearings

This article links to http://
Please indicate China Bearing Network http://

Previous:Maintenance of imported bearings, bearing seals, dust cover features: The key to machining the shaft diameter and bearing bush

Aluminum Clip-in Commercial Ceiling Tile

Aluminum Clip-In Commercial Ceiling Tile,Commercial Ceiling Tiles,Galvanized Acoustic Ceiling Tiles,Galvanized Suspended Ceiling Tiles

Foshan Nanhai Lianxing Deli Decoration Materials Co.,Ltd , https://www.fstuodeli.com