Specific introduction of spherical roller bearings

Spherical roller bearings have double-row rollers, the outer ring has a common spherical raceway, and the inner ring has two raceways that are inclined at an angle relative to the bearing axis. This clever structure makes it have self-aligning performance, so it is not easy to be affected by the angle of the shaft and the bearing box seat on the error or shaft bending. It is suitable for installation errors or shaft deflection caused by angle errors. In addition to the radial load, the bearing can also withstand the axial load acting in both directions.

 

Spherical roller bearings have cylindrical and conical bores. The taper of the conical bore is 1:30 and 1:12. This conical bore bearing is equipped with an adapter sleeve or a withdrawal sleeve. The tapered inner hole self-aligning ball bearing can be easily and quickly assembled on the optical shaft or the stepper shaft.

 

Spherical roller bearings have two rows of rollers, which mainly bear radial load, but can also bear axial load in any direction. With high radial load capacity, it is especially suitable for working under heavy load or vibration load, but it cannot bear pure axial load. The outer ring raceway of this type of bearing is spherical, so it has good centering performance and can compensate for the coaxiality error.

 

There are two rows of symmetrical spherical rollers, the outer ring has a common spherical raceway, and the inner ring has two raceways inclined to the axis of the bearing. It has good alignment performance. When the shaft is bent or installed out of center The bearing can still be used normally. The alignment varies with the bearing size series. Generally, the allowable alignment angle is 1~2.5 degrees. This type of bearing has a large load capacity. In addition to the radial load, the bearing can withstand both directions The acting axial load has good impact resistance. Generally speaking, the allowable working speed of spherical roller bearings is low.

 

Spherical roller bearings are divided into two different structures: symmetrical spherical rollers and asymmetrical spherical rollers according to the cross-sectional shape of the rollers. Asymmetrical spherical roller bearings are early products, mainly for maintenance services of the main engine, and the new design of the main engine Symmetrical spherical roller bearings are rarely used. The internal structure has undergone a comprehensive improved design and parameter optimization. Compared with the earlier produced spherical roller bearings, it can withstand greater axial load. The operating temperature of this bearing It is low, so it can meet the requirements of higher speed. According to the inner ring with or without ribs and the cage used, it can be divided into two types: C type and CA type. The characteristics of C type bearings are that the inner ring has no ribs and the use of steel plates. Stamping cage, CA type Teruien bearing is characterized by ribs on both sides of the inner ring and the use of car-made solid cage. In order to improve the lubrication of the bearing, a spherical roller bearing with an annular oil groove and three oil holes on the outer ring can be provided to the user, which is indicated by the bearing post code /W33. According to user requirements, spherical roller bearings with inner ring oil holes can also be supplied. In order to facilitate customers to install and replace bearings, spherical roller bearings with a taper inner hole can also be provided, and the taper hole taper is 1:12 , The suffix code is K to indicate that in order to meet the requirements of special users, bearings with an inner bore taper of 1:30 can also be provided, and the suffix code is K30. Bearings with a tapered inner hole can be directly mounted on the tapered journal with a lock nut, or can be mounted on the cylindrical journal with the aid 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 action when the bearing is running at high speed, the bearing should bear a certain minimum radial load. The size can be estimated as follows:

Fr =0.02C

Where:

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

Where:

P—Equivalent dynamic load N

Y1 Y2—Axial dynamic load factor

Equivalent static load

P0=Fr+Y0Fa

Where:

P0—Equivalent static load N

Y0—Axial static load factor