What is bearing and its application range
publisherEcho
time2020/07/22
- Bearing classification is divided into deep groove ball bearings, angular contact ball bearings, four-point contact ball bearings, tapered roller bearings, etc.
Deep groove ball bearing
The most representative rolling bearing is widely used. It can bear radial load and bidirectional axial load. Suitable for high-speed rotation and occasions requiring low noise and low vibration. Sealed bearings with steel plate dust caps or rubber seals are pre-filled with an appropriate amount of grease. Bearings with a stop ring or flange on the outer ring are easy to locate in the axial direction and easy to install in the housing. The size of the maximum load bearing is the same as the standard bearing, but there is a filling groove in the inner and outer rings, which increases the number of balls and improves the cage and stamped steel cage (wave, crown...single row; S) Shape...double row)
Copper alloy or phenolic resin cutting cage, synthetic resin molding cage. The main purpose:
Automobiles: rear wheels, transmissions, electrical components, electrical: general motors, household appliances
Others: meters, internal combustion engines, construction machinery, railway vehicles, handling machinery, agricultural machinery, various industrial machinery
Angular contact ball bearings
There is a contact angle between the ferrule and the ball. The standard contact angles are 15°, 30° and 40°. The larger the contact angle, the greater the axial load capacity. The smaller the contact angle, the more conducive to high-speed rotation. Single row bearings can bear radial load and unidirectional axial load, DB combination, DF combination and double row bearings can bear radial load and bidirectional axial load, DT combination is suitable for larger unidirectional axial load, the rated load of a single bearing Inadequate occasions. ACH type bearings for high-speed use have small ball diameters and many balls, and are mostly used in machine tool spindles; angular contact ball bearings are suitable for high-speed and high-precision rotation. The two single-row angular contact ball bearings combined on the back of the structure share the inner ring and outer ring. , It can bear radial load and bidirectional axial load, and the bearings without filling groove are also sealed.
Mainly applicable cages: steel stamping cages (bowl shape...single row; S shape, crown shape...double row), copper alloy or phenolic resin cutting cage, synthetic resin forming cage. The main purpose:
Single row: machine tool spindle, high frequency motor, gas turbine, centrifugal separator, front wheel of small car, differential pinion shaft.
Double rows: oil pumps, roots blowers, air compressors, various transmissions, fuel injection pumps, printing machinery.
Four point contact ball bearing
It can bear radial load and bidirectional axial load. A single bearing can replace the angular contact ball bearing combined on the front or back. It is suitable for bearing pure axial load or synthetic load with large axial load component. This type of bearing can form a contact angle (α) when bearing axial load in any direction, so the ring and the ball are always in contact with each other Three-point contact on both sides of the line.
Mainly applicable cage: copper alloy cut cage. Main uses: aircraft jet engines, gas turbines. Self-aligning ball bearing
Because the raceway surface of the outer ring is spherical and has the centering performance, it can automatically adjust the axis misalignment caused by the deflection or misalignment of the shaft or housing. The tapered bore bearing can be easily installed on the shaft by using fasteners. Stamping steel cage: chrysanthemum shape...12, 13, 22...2RS, 23...2RS, sunflower shape...22, 23 Uses: woodworking machinery, textile machinery transmission shafts, vertical self-aligning bearings with seat Cylindrical roller bearings
The cylindrical roller is in line contact with the raceway, and the radial load capacity is large, that is, it is suitable for bearing heavy loads and impact loads.
It is also suitable for high-speed rotation. N-type and NU-type can move axially, and can adapt to changes in the relative position of shaft and housing caused by thermal expansion or installation error. It is most suitable for use as free end bearings. NJ-type and NF-type can withstand a certain degree NH type and NUP type can bear a certain degree of bidirectional axial load. The inner ring or outer ring can be separated for easy assembly and disassembly. NNU type and NN type have strong rigidity against radial load and are mostly used for machine tool spindles. .
Mainly applicable cages: steel stamping cage (Z-shaped), copper alloy cutting cage, pin cage, synthetic resin forming cage.
Main uses: medium and large motors, generators, internal combustion engines, gas turbines, machine tool spindles, speed reducers, loading and unloading machinery, various industrial machinery. Solid needle roller bearings
The basic structure of the bearing with inner ring is the same as that of the NU cylindrical roller bearing, but due to the use of needle rollers, the volume can be reduced and can withstand large radial loads. The bearing without inner ring should use the mounting surface of the shaft with appropriate accuracy and hardness as The raceway surface is used.
Mainly applicable cage: steel stamping cage.
Main application: automobile engine, transmission, pump, excavator crawler wheel, hoist, bridge crane, compressor.
Tapered Roller Bearings
This type of bearing is equipped with truncated cone-shaped rollers, which are guided by the large rib of the inner ring. In the design, the vertices of each conical surface of the inner ring raceway surface, the outer ring raceway surface and the roller rolling surface intersect at a point on the center line of the bearing. Single row bearings can bear radial load and unidirectional axial load, and double row bearings can bear radial load and bidirectional axial load.
It is suitable for bearing heavy load and impact load. According to the difference of contact chest (α), it is divided into three types: small cone angle, medium cone angle and large cone angle. The larger the contact angle, the greater the axial load capacity. The outer ring and inner components (inner ring and roller and cage components) can be separated for easy assembly and disassembly. The bearings with the rear auxiliary code "J" or "JR" are internationally interchangeable. This type of bearings also mostly use inch series products.
Mainly applicable cages: steel stamping cages, synthetic resin forming cages, pin-type cages. Main applications: Automobile: front wheel, rear wheel, transmission, differential pinion shaft. Machine tool spindles, construction machinery, large agricultural machinery, railway vehicle gear reduction devices, rolling mill roll necks and reduction devices. Spherical roller bearing
This type of bearing is equipped with spherical rollers between the outer ring of the spherical raceway and the inner ring of the double raceway. According to the internal structure, it is divided into four types: R, RH, RHA and SR. Because the arc center of the outer ring raceway is The center of the bearing is consistent, with self-aligning performance, so it can automatically adjust the axis misalignment caused by the deflection or misalignment of the shaft or housing. It can bear radial load and bidirectional axial load. Especially the radial load capacity is large, suitable for bearing heavy load and shock load