I. according to the size of rolling bearing, it is divided into:

(1) miniature bearings -- bearings with nominal outer diameter of less than 26mm;

(2) small-sized bearings -- bearings with nominal diameter of 28-55mm;

(3) medium and small-sized bearings -- bearings with nominal outer diameter of 60-115mm;

(4) medium and large bearings -- bearings with nominal outer diameter size range of 120-190mm

(5) large bearings -- bearings with nominal diameter of 200-430mm;

(6) oversize bearing -- nominal outside diameter size range is 440-2000mm bearing.

(7) heavy bearing -- bearing with nominal outside diameter size range of more than 2000mm.

Two, according to the direction of the load can be divided into: (1) radial bearing, also known as centripetal bearing, bear radial load.Thrust bearing, also known as thrust bearing, bearing axial load.Radial thrust bearing, also known as radial thrust bearing, both radial and axial load.According to the different friction properties of bearings, it can be divided into sliding friction bearings (plain bearings) and rolling friction bearings (rolling bearings).

Iii. Rolling bearings can be divided into:

1. Deep groove ball bearing

The deep groove ball bearing is simple in structure and easy to use.It is mainly used to bear a radial load, but also can bear a certain axial load.When the radial clearance of the bearing increases, it has the function of angular contact bearing and can bear large axial load.

2. Adjustable ball bearing

The aligning ball bearing has two columns of steel balls, the inner ring has two raceway, the outer ring raceway is the inner spherical shape, with the performance of automatic centering.It can automatically compensate the coaxiality error caused by the winding of the shaft and the deformation of the shell.The bearing mainly bears radial load, while bearing radial load, can also bear a small amount of axial load, usually not used to bear pure axial load, such as pure axial load, only a row of steel ball force.

3. Angular contact ball bearing

The angular contact ball bearing has a high limit speed, which can bear both meridional load and axial load as well as pure axial load. Its axial load capacity is determined by the contact Angle and increases with the increase of the contact Angle.

4. Cylindrical roller bearing

The roller of cylindrical roller bearing is usually guided by two guard edges of a bearing ring and a cage. The roller and guide ring form a composite part, which can be separated from another bearing ring and belongs to separable bearing.This kind of bearing is easy to install and disassemble, especially when it is required that the inner, outer ring and shaft and housing are interference fit.This type of bearing is generally only used to bear radial load, only the inside. The outer ring with the baffle edge of the single row bearing can withstand small steady axial load or large intermittent axial load.

5. Adjustable roller bearing

There are two rows of rollers, which are mainly used for bearing radial load and axial load in either direction.The bearing has high radial load capacity, especially suitable for working under heavy load or vibration load, but can not bear the pure axial load;Good centering performance, can compensate with bearing error.

6. Tapered roller bearing

Tapered roller bearings are mainly suitable for bearing combined radial and axial loads with mainly radial load, while tapered roller bearings with large cone Angle can be used for bearing combined radial and axial loads with mainly axial load.This type of bearing is a separated bearing, the inner ring (including tapered roller and cage) and the outer ring can be installed separately.In the process of installation and use, the radial clearance and axial clearance of the bearing can be adjusted.

7. Thrust ball bearing

Thrust ball bearing is a separation bearing, the shaft ring "seat ring can be separated from the cage" steel ball components.Shaft ring is matched with the shaft ring, the seat ring is matched with the bearing seat hole ring, and there is a gap between the shaft.

Thrust ball bearing can only pull hand axial load, one-way thrust ball bearing can only bear the axial load of one room, two-way thrust ball bearing can bear the axial load of two directions.The thrust ball bears the warp direction of the shaft which cannot be restricted, and the limit speed is very low.Unidirectional thrust ball bearings can limit the axial displacement in one direction of the shaft and the housing, while bidirectional bearings can limit the axial displacement in two directions.

8. Thrust roller bearing

Thrust centering roller bearings are used for bearing axial loads. Combined meridional loads shall not exceed 55% of the axial loads.Compared with other thrust roller bearings, the friction factor of this bearing is lower, the speed is higher, and it has the ability to adjust the center.The roller of type 29000 bearing is an asymmetric spherical roller, which can reduce the relative sliding of the stick and raceway in the work, and the roller is long. The diameter is large, the number of rollers is large and the load capacity is large.In the design of selection, should give priority to the selection.

Needle roller bearing

Needle roller bearing is equipped with thin and long roller (the length of the roller is 3~10 times of the diameter, the diameter is generally no more than 5mm), so the radial structure is compact, its inner diameter size and load capacity is the same as other types of bearings at the same time, the outer diameter is the smallest, especially suitable for and radial installation size is limited by the support structure.According to the use of different occasions, can be used without inner ring of the bearing or needle roller and cage components, at this time to suit the bearing surface of the shaft neck and the shell hole directly as a bearing surface. The rolling surface, to keep the load capacity and operation performance and you have the same ring bearing, axis or shell hole hardness on the surface of the raceway. The machining accuracy and surface and surface quality should be as a bearing ring raceway.The bearing can only bear radial load.

10. Outer spherical ball bearing with seat

Outer spherical ball bearing with seat is composed of outer spherical ball bearing with seal on both sides and cast (or steel plate stamped) bearing seat.The inner structure of the outer spherical ball bearing is the same as that of the deep groove ball bearing, but the inner ring of the bearing is wider than the outer ring.Usually there is a gap between the inner hole and the shaft of this kind of bearing.Bearing structure compact, convenient loading and unloading, sealing perfect, suitable for simple support, often used in mining. Metallurgy. Agriculture. Chemical industry. Textile. Printing and dyeing. Conveying machinery.