Deep groove ball bearing is the most representative rolling bearing, which can bear radial load and bidirectional axial load and has a wide range of applications. Suitable for high-speed rotation and occasions requiring low noise and vibration. The sealed bearing with steel plate dust cover or rubber sealing ring is pre-filled with proper amount of grease, which is convenient for axial positioning and installation in the shell. The maximum load bearing has the same size as the standard bearing, but the inner and outer rings have filling grooves, which increases the number of balls and cages mainly suitable for rated load. S-shaped ... double-row) copper alloy or phenolic resin cutting cage, synthetic resin molding cage Main uses: automobiles: rear wheels, transmissions, electrical parts, electricity: general motors, household appliances, others: instrumentation, internal combustion engines, construction machinery, railway vehicles, handling machinery, agricultural machinery, and various industrial machinery. There is a contact angle between the ring of angular contact ball bearing and the ball. The standard contact angles are15, 30 and 40. The greater the contact angle, the greater the axial bearing capacity, and the smaller the contact angle, which is more conducive to the high-speed rotating single-row bearing to bear radial load and unidirectional axial load. DB combination, DF combination and double-row bearing can bear radial load and bidirectional axial load. DT combination is suitable for larger unidirectional axial load. When the rated load of a single bearing is insufficient, the ball diameter of ACH bearing used at high speed is small and there are many balls. Most of the angular contact ball bearings used for machine tool spindle are suitable for two single-row back combined angular contact ball bearings in high-speed and high-precision rotating structure. The inner ring and the outer ring can bear radial load and bidirectional axial load. There are also sealed cages: steel plate stamping cages (bowl-shaped … single row; S-shaped, crown-shaped … double-row) copper alloy or phenolic resin cutting cage, synthetic resin molding cage main uses: single row: machine tool spindle, high-frequency motor, gas turbine, centrifugal separator, front wheel of small car, differential pinion shaft double row: four-point contact ball bearings of oil pump, Roots blower, air compressor, various transmissions, fuel injection pump and printing machinery can bear radial load and bidirectional axial load. A single bearing can be replaced by a front assembly or a rear assembly for angular contact ball bearings. Suitable for bearing pure axial load or composite load with large axial load component. This bearing can form a contact angle (α) when bearing axial load in any direction. Therefore, the three-point contact between the ring and the ball on any contact line is mainly suitable for the cage: the copper alloy cut cage is mainly used: the self-aligning ball bearing of jet engine and gas turbine of aircraft has self-aligning performance because the raceway surface of the outer ring is spherical. Therefore, it can automatically adjust the misalignment of the shaft center caused by the deflection or misalignment of the shaft or shell. Tapered hole bearings can be easily installed on shafts with fasteners: chrysanthemum-shaped … 12, 13, 22…2RS, 23…2RS sunflower-shaped …22, 23 woodworking machinery, textile machinery transmission shafts, vertical self-aligning bearings with seats, cylindrical roller bearings, and cylindrical rollers are in contact with raceway lines. It is not only suitable for bearing heavy load and impact load, but also suitable for high-speed rotating N-type and NU-type which can move axially, and can adapt to the change of relative position between shaft and shell caused by thermal expansion or installation error. It is most suitable as a free-end bearing. NJ type and NF type can bear a certain degree of unidirectional axial load, and NH type and NUP type can bear a certain degree of bidirectional axial load. The inner ring or the outer ring can be separated, which is convenient to assemble and disassemble. NNU type and NN type have strong rigidity to resist radial load. Most of the cages used for machine tool spindles are mainly applicable to: steel plate stamping cages (Z-shaped), copper alloy cutting cages, pin cages and synthetic resin molding cages. The main uses are: large and medium-sized motors, generators, internal combustion engines, gas turbines, machine tool spindles, reducers, handling machinery and various industrial machinery. The basic structure of solid needle roller bearing with inner ring is the same as that of NU cylindrical roller bearing, but because of the use of needle roller, the volume can be reduced, and the bearing without inner ring can bear larger radial load. A shaft mounting surface with appropriate precision and hardness shall be used as the raceway surface. The main applicable cages are: steel plate stamping cages. The main applications are: automobile engine, transmission, water pump, crawler wheel of excavator, crane, bridge crane and tapered roller bearing of compressor. These bearings are equipped with frustum conical rollers. The roller is guided by the large flange of the inner ring. It is designed as a one-point single-row bearing with the vertexes of the inner raceway surface, the outer raceway surface and the tapered surface of the roller rolling surface intersecting at the bearing center line, which can bear radial load and unidirectional axial load, and a double-row bearing can bear radial load and bidirectional axial load, and is suitable for bearing heavy load and impact load. According to the different contact chest (α), it can be divided into three types: small cone angle, medium cone angle and large cone angle. The greater the contact angle, the greater the axial bearing capacity. The outer ring can be separated from the inner assembly (inner ring, roller and cage assembly) for easy disassembly. Bearings with auxiliary code "J" or "JR" are internationally interchangeable. This kind of bearing also uses cages mainly suitable for English series products: steel plate stamping cages, synthetic resin molding cages and pin cages. Main applications: automobile: front wheel, rear wheel, transmission and differential pinion shaft. Self-aligning roller bearings for machine tool spindles, construction machinery, large agricultural machinery, gear reducers for railway vehicles, roll necks of rolling mills and reducers. These bearings are equipped with spherical rollers between the outer ring of spherical raceway and the inner ring of double raceway. According to the different internal structure, it can be divided into four types: R, RH, RHA and SR. Because the arc center of the outer ring raceway is consistent with the bearing center, it has self-aligning performance, so it can automatically adjust the axial misalignment caused by shaft or shell deflection or eccentricity. Especially the tapered hole bearing with large radial bearing capacity is suitable for bearing heavy load and impact load. There are two types (taper) by using fasteners or disassembling sleeves: 1:30 (auxiliary code: K30) ... applicable to 240,241series 1: 12. The inner ring can also be provided with oil holes and oil grooves, which are mainly suitable for cages: copper alloy cutting cages, steel plate stamping cages, needle cages and synthetic resin molding cages. The main uses are: papermaking machinery, reducers, railway vehicle axles, gear box seats of rolling mills, roller raceways of rolling mills, crushers, vibrating screens, printing machinery, woodworking machinery, various industrial reducers and vertical self-aligning bearings with seats. Thrust ball bearing consists of washer-shaped raceway ring with raceway, ball and cage assembly. Bidirectional bearings match the secret shaft of the central ring with the unidirectional bearing to bear unidirectional axial load, and the bidirectional bearing can bear bidirectional axial load (neither can bear radial load). The main applicable cages are steel plate stamping cages, copper alloy or phenolic resin cutting cages and synthetic resin molding cages. The main uses are: automobile steering pin, machine tool spindle thrust cylindrical roller bearing consists of washer-shaped raceway ring (shaft ring and seat ring), cylindrical roller and cage assembly. Cylindrical roller is made of convex surface, so the pressure distribution between roller and raceway surface is uniform and can bear unidirectional axial load. The main applicable cage is copper alloy cutting cage. The main uses are: oil drilling rig, steel-making machinery and thrust needle bearing. The separable bearing consists of raceway ring, needle roller and cage assembly. The inseparable bearing, which can be arbitrarily combined with the stamped thin raceway ring (W) or the machined thick raceway ring (WS), is an integral bearing composed of precision stamped raceway ring, needle roller and cage assembly, and can bear unidirectional axial load. This kind of bearing occupies small space and is beneficial to the compact design of machinery. Most of them only use needle rollers and cage assemblies. The mounting surface of the shaft and the shell is the raceway surface, and the main applicable cages are: steel plate stamping cage and synthetic resin molding cage. Main applications: speed change devices for automobiles, cultivators and machine tools. Thrust tapered roller bearing. These bearings are equipped with frustum-shaped rollers (big ends are spherical). The roller is precisely guided by the retaining edge of raceway ring (raceway ring and raceway ring). In the design, the unidirectional bearing which makes the apex of raceway ring and raceway surface of raceway ring intersect with all conical surfaces of roller rolling surface on the bearing center line can bear unidirectional axial load, and the bidirectional bearing can bear bidirectional axial load. The bidirectional bearing matches the middle ring with the shaft. However, due to the clearance fit, it is necessary to axially position the intermediate ring with a shaft sleeve or the like. Mainly applicable to cages: copper alloy cutting cages. Main uses: one-way crane hook, oil drilling rig swivel, two-way: rolling mill roll neck thrust self-aligning roller bearing. The spherical rollers in this bearing are arranged obliquely. Because the raceway surface of the race is spherical and has self-aligning performance, the shaft can be allowed to have a certain inclined axial load capacity. It can bear part of radial load while bearing axial load. When in use, it is generally lubricated with oil. The main applicable cage is copper alloy cutting cage. The main applications are: hydro-generator, vertical motor, marine propeller shaft, rolling screw reducer of rolling mill, tower crane, coal mill, extruder and forming machine.