The main form of wind power main bearing

 

At present, the main forms of spindle bearings used for megawatt wind turbines are 3-point bearing bearing design and 2-point bearing bearing design, of which the bearing design scheme of 2-point support is mainly divided into spherical roller bearing and spherical roller bearing combination, spherical roller bearing and cylindrical roller bearing combination, double row tapered roller bearing and cylindrical roller bearing combination, 2 single row tapered roller bearing combination (divided into 2 design schemes of long axis and short axis), face-to-face double row tapered roller single bearing and integrated design.

 

Spherical roller bearings + spherical roller bearings

 

The structure of spherical roller bearing + spherical roller bearing: generally the main shaft is supported by 2 bearings, the main bearing close to the windmill side is the spherical roller bearing, and the main bearing close to the gearbox side is the spherical roller bearing, and the connection between the gearbox and the main shaft adopts expansion sleeve or bolt connection.

Advantages and disadvantages of the structure

 

Spherical roller bearings + cylindrical roller bearings

The structure of spherical roller bearings is 10 cylindrical roller bearings: generally the main shaft is supported by 2 bearings, the main bearing close to the wind wheel side is the spherical roller bearing, and the main bearing close to the gearbox side is a cylindrical roller bearing, the 2 main shaft bearings share 1 bearing chamber, and the connection between the gearbox and the main shaft adopts expansion sleeve or bolt connection,

 

Double row tapered roller bearings + cylindrical roller bearings

The structure of double row tapered roller bearing + cylindrical roller bearing: generally the main shaft is supported by 2 bearings, usually the main bearing close to the wind wheel side is a double row tapered roller bearing, and the main bearing close to the gearbox side is a cylindrical roller bearing, the 2 main shaft bearings share a bearing chamber, and the connection between the gearbox and the main shaft adopts expansion sleeve or bolt connection.

 

2 single row tapered roller bearings with small diameters

The structure of 2 small diameter single row tapered roller bearings: generally the main shaft is supported by 2 tapered roller bearings, the 2 main shaft bearings share 1 bearing chamber [+], the main shaft is generally a structure with a small diameter and a long length, and the connection between the gearbox and the main shaft adopts an expansion sleeve or bolt connection, and its structure is shown in Figure 4.

 

2 large-diameter single row tapered roller bearings

The structure of two large-diameter single-row tapered roller bearings: generally the main shaft is supported by two large-diameter tapered roller bearings, the two spindle bearings share a bearing chamber, the spindle is generally a structure with a larger diameter and a shorter length, and the connection between the gearbox and the spindle is connected by expansion sleeve or bolt connection.

 

Single bearing

The structure of a single bearing: generally the main shaft is supported by a large diameter tapered roller bearing, the main shaft is generally a large diameter and relatively short structure, and the connection between the gearbox and the main shaft adopts expansion sleeve or bolt connection.

 

Integrated design

The structure of the integrated design is supported by two single row tapered roller bearings, the two bearings share one bearing chamber, the interference fit or spline connection is adopted between the gearbox and the spindle, and the bearing chamber and the box of the gearbox are connected together by bolts, that is to say, the spindle system and the gearbox are integrated together.