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Spherical roller bearing

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Spherical roller bearings have two rows of rollers, which mainly bear radial loads and can also bear axial loads in either direction. With high radial load capacity, it is especially suitable for working under heavy or vibration loads, but cannot withstand pure axial loads. This type of bearing's outer ring raceway is spherical, so its self-aligning performance is good, and it can compensate for coaxiality errors.

There are two rows of symmetrical spherical rollers, the outer ring has a common spherical raceway, the inner ring has two raceways inclined at an angle to the bearing axis, and has good self-aligning performance. When the shaft is bent or the installation is not concentric The bearing can still be used normally. The self-aligning performance varies with different bearing size series. Generally, the allowed self-aligning angle is 1 ~ 2.5 degrees. This type of bearing has a large load capacity. In addition to bearing radial loads, the bearing can also bear. Axial load acting in both directions has better impact resistance. Generally speaking, the working speed allowed by spherical roller bearings is low.

Spherical roller bearings are divided into symmetrical spherical rollers and asymmetrical spherical rollers according to the cross-sectional shape of the rollers. Asymmetric spherical roller bearings are early products, mainly for mainframe maintenance services, and newly designed mainframes. Symmetric spherical roller bearings are rarely selected when the internal structure has been comprehensively improved and the parameters are optimized. Compared with the spherical roller bearings produced earlier, it can withstand greater axial loads. The operating temperature of this bearing Low, so it can meet the requirements of higher speeds. According to the inner ring with or without ribs and the cage used, it can be divided into two types: C and CA. C-type bearings are characterized by no ribs on the inner ring and the use of steel plates. Stamped cage, CA type Trian bearings are characterized by ribs on both sides of the inner ring and the use of a solid car cage. In order to improve the lubrication of the bearing, the outer ring can be provided with a ring oil groove and three oil Spherical roller bearings with holes are indicated by bearing rear code / W33. Spherical roller bearings with oil holes in the inner ring can also be supplied according to user requirements. In order to facilitate customers' assembly and disassembly and replacement of bearings, inner hole belts are also available. Taper Spherical Roller Shaft Bearings, taper hole taper is 1:12 and later coded as K. In order to meet the requirements of special users, bearings with a taper of 1:30 can also be provided. The nut directly installs the bearing on the tapered journal, and the bearing can also be installed on the cylindrical journal by means of an adapter sleeve or a withdrawal sleeve. In order to ensure that the bearing prevents harmful slippage between the raceway and the roller due to centrifugal effect when the bearing is running at high speed, the minimum radial load that the bearing should bear can be estimated as follows:

Fr = 0.02C


Fr-minimum radial load N

C—Basic dynamic load rating of bearing N

Equivalent dynamic load

P = Fr + Y1Fa when Fa / Fr e

P = 0.67Fr + Y2Fa when Fa / Fr e


P—Equivalent dynamic load N

Y1 Y2—Axial dynamic load coefficient

Equivalent static load

P0 = Fr + Y0Fa


P0—Equivalent static load N

Y0—axial static load coefficient



structure type

Spherical roller bearings are divided into: cylindrical inner hole and conical inner hole. The taper of the tapered bore is 1:12 spherical roller bearing (type 153000 or 113000) and K30 spherical roller bearing. When this type of bearing is matched with a conical shaft, the inner ring moves in the axial direction to adjust the radial clearance of the bearing.



The tapered spherical roller bearings with rear code K and K30 are installed on the matching adapter sleeves, and then become the rear bearings K + H and K30 + H. This type of bearing can be installed on the optical axis without a shoulder, which is suitable for occasions where the bearing needs to be frequently installed and removed. In order to improve the lubricating performance of the bearing, there is an annular oil groove on the outer ring of the bearing and three oil holes are evenly drilled. The rear code is W33.


Specific classification and model comparison:

1. Spherical roller bearings (20000 CC type)

2. Spherical roller bearings with tapered bore (type 20,000 CCK)

3. Spherical roller bearings (20000 CC / W33 type)

4. Spherical roller bearings with tapered bore (20000 CCK / W33 type)

5. Spherical roller bearings mounted on adapter sleeves (20000 CCK + H0000 type)

6. Spherical roller bearings mounted on adapter sleeves (20000 CCK / W33 + H0000 type)

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