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You should know the applications of different types of bearings
As we all know, bearings are “parts that help machinery rotate.” As the name suggests, bearings are the components that support the “shaft” that rotates in a machine. Machines that use bearings include cars, airplanes, generators, etc. Bearings are also used in household appliances such as refrigerators, vacuum cleaners, air conditioners, etc. In these machines, bearings are responsible for supporting the “shaft” with wheels, gears, turbines, rotors, and other parts and helping the shaft rotate smoothly. Since many rotating “shafts” are used in various machines, bearings have become an essential part and are called the “food of the mechanical industry.”
1. Reduce friction and make rotation smoother. There is bound to be friction between the rotating “shaft” and the rotating support part. Bearings are used between the rotating “shaft” and the rotating support part. Bearings can reduce friction, make rotation smoother, and reduce energy consumption. This is the biggest role of bearings.
There is a contact angle between the ring and the ball. The standard contact angle is 15° (mostly used for larger-sized precision bearings), 30° (mostly used for precision spindle bearings) and 40° (suitable for bearing larger axial loads) , the larger the contact angle, the greater the axial load capacity. The smaller the contact angle, the conducive to high-speed rotation. Single-row bearings can withstand radial loads and one-way axial loads. Structurally, two single-row angular contact ball bearings combined on the back share the inner ring and outer ring and can bear radial load and bidirectional axial load.
Single row angular contact bearing applications: machine tool spindles, high-frequency motors, gas turbines, centrifugal separators, small car front wheels, differential pinion shafts.
Double row angular contact bearing applications: oil pumps, Roots blowers, air compressors, various transmissions, fuel injection pumps, and printing machinery.
Aligning ball bearings automatically adjust axis misalignment caused by deflection or misalignment of the shaft or housing. Bearings with tapered holes can be easily installed on the shaft with fasteners and mainly bear radial loads.
Main applications: woodworking machinery, textile machinery drive shafts, vertical seated self-aligning bearings.
Spherical roller bearings are equipped with spherical rollers between the outer ring of the spherical raceway and the inner ring of the double raceway. According to the different internal structures, it can be divided into four types: R type, RH type, RHA type and SR type. Since the arc center of the outer raceway is consistent with the bearing center, it has self-aligning performance, so the shaft or shell can be automatically adjusted. Axial misalignment caused by deflection or misalignment can withstand radial load and bidirectional axial load.
Main applications: papermaking machinery, reduction gears, railway vehicle axles, rolling mill gearbox seats, rolling mill rollers, crushers, vibrating screens, printing machinery, woodworking machinery, various industrial reducers, vertical seated spherical bearings .
In this bearing, the spherical rollers are arranged at an angle. Because the raceway surface of the race is spherical and has self-aligning properties, the shaft can tolerate some tilt and has a large axial load capacity. It can not only bear axial load, but also bear certain radial load. It is generally lubricated with oil when used.
Main applications: hydraulic generators, vertical motors, propeller shafts for ships, reducers for rolling screws in rolling mills, tower cranes, coal mills, extruders, and forming machines.
Tapered roller bearings are equipped with truncated conical rollers. The rollers are guided by the large ribs of the inner ring. They are designed so that the apexes of the inner ring raceway surface, the outer ring raceway surface and the roller rolling surface intersect at the center of the bearing. A point on the line. Single-row bearings can bear radial loads and one-way axial loads, while double-row bearings can bear radial loads and two-way axial loads, and are suitable for bearing heavy loads and impact loads.
Main applications: Automotive: front wheels, rear wheels, transmissions, differential pinion shafts. Machine tool spindles, construction machinery, large agricultural machinery, railway vehicle gear reduction devices, rolling mill roll necks and reduction devices.
Structurally, each ring of a deep groove ball bearing has a continuous groove raceway whose cross-section is approximately one-third of the equatorial circumference of the ball. Deep groove ball bearings are mainly used to bear radial loads and can also bear certain axial loads. When the radial clearance of the bearing increases, it has the characteristics of an angular contact ball bearing and can withstand bidirectional alternating axial loads. Compared with other types of bearings of the same size, this kind of bearing has a small friction coefficient, high limit speed and high precision. It is the preferred bearing type for users.
Main applications: automobiles, tractors, machine tools, motors, water pumps, agricultural machinery, textile machinery, etc.
Thrust ball bearings consist of a washer-shaped raceway ring with raceways, balls and a cage assembly. The raceway ring that matches the shaft is called the shaft ring, and the raceway ring that matches the housing is called the seat ring. The two-way bearing is matched with the middle ring’s dense shaft. The one-way bearing can bear one-way axial load, and the two-way bearing can bear two-way axial load (neither can bear radial load).
Main applications: automobile steering pins, machine tool spindles.
Thrust roller bearings are used to bear the combined axial load of a shaft dominated by axial load, but the radial load shall not exceed 55% of the axial load. Compared with other thrust bearings, this bearing has a lower friction coefficient, higher rotational speed and self-aligning ability. The rollers of 2000 bearings are asymmetric spherical rollers, which can reduce the relative sliding between the rollers and the raceway during operation. In addition, the roller is long and has a large diameter, a large number of rollers, and a large load-bearing capacity, so oil lubrication is usually used, and grease lubrication can be used in some low-speed situations.
Main applications: hydroelectric generators, crane hooks.
The rollers of cylindrical bearings are usually guided by two fixed edges of the bearing ring. The cage roller and guide ring form an assembly that can be separated from another bearing ring and is a separable bearing. This kind of bearing is easy to install and disassemble, especially when the inner and outer rings need an interference fit with the shaft and housing. This type of bearing is generally only used to bear radial loads. Only single-row bearings with flanges on the inner and outer rings can bear small steady-state axial loads or large intermittent axial loads.
Main applications: large motors, machine tool spindles, axle boxes, diesel engine crankshafts, automobiles, etc.
10. Four-point contact ball bearings
Four-point contact ball bearings can withstand radial loads and bidirectional axial loads. A single bearing can replace the front and rear combined angular contact ball bearings and is suitable for bearing pure axial load or composite load with a large axial load component. When subjected to axial load in any direction, this kind of bearing can form one of the contact angles, so the rings and balls are always in contact at three knife points on both sides of any contact line.
Main applications: aircraft jet engines, gas turbines.
11. Thrust cylindrical roller bearings
Thrust cylindrical roller bearings are composed of washer-shaped raceway rings (shaft ring and seat ring), cylindrical rollers and cage components. The cylindrical roller is processed into a convex surface, and the pressure between the roller and the raceway surface is evenly distributed. It can withstand one-way axial load, has large axial load-bearing capacity and strong axial rigidity.
Main applications: oil drilling rigs, iron and steel making machinery.
The release bearing is composed of raceway rings, needle rollers and cage components. The raceway rings can be thinned or thickened in any combination. Non-separable bearings are integral bearings composed of precision stamped raceway rings, needle rollers and cage assemblies, which can withstand unidirectional axial loads. This kind of bearing takes up little space and is conducive to the compact design of machinery. Most bearings only use a needle roller and cage assembly, with the mounting surface of the shaft and housing used as the raceway surface.
Main applications: transmission devices of automobiles, cultivators, machine tools, etc.
Thrust tapered roller bearings are equipped with frustum tapered rollers (the big end is spherical), which are accurately guided by the ribs of the raceway ring (shaft ring and seat ring). In the design, the apex of each tapered surface of the shaft ring and seat ring raceway intersects with the rolling surface of the roller at a point on the bearing center line. One-way bearings can bear one-way axial load, and two-way bearings can bear two-way axial load.
Main applications: One-way: crane hooks, oil drilling rig swivels. Both directions: rolling mill roll neck.
14. Insert spherical ball bearing with seat
The seated spherical ball bearing is composed of a sealed spherical ball bearing on both sides and a cast (or steel plate stamping) bearing seat. The internal structure of the outer spherical ball bearing is the same as that of the deep groove ball bearing, but the inner ring of this bearing is wider than the outer ring, and the outer ring has a truncated spherical outer surface that can automatically align with the concave spherical surface of the bearing seat.
Main applications: mining, metallurgy, agriculture, chemical industry, textile, printing and dyeing, conveying machinery, etc.
Miniature ball bearings have a wide range of applications. Suitable for products requiring high speed rotation, low friction torque, low vibration and low noise. Product Features. Among ultra-small diameter micro bearings, there are 18 types of micro bearings with an inner diameter of φ2mm or less in the metric 68, 69, and 60 series, and a total of 6 types in the inch R series. On this basis, they can also be divided into ZZ steel plate bearing dust cover series , RS rubber bearing seal series, Teflon bearing seal series, flange series, stainless steel series, ceramic ball series, etc. Miniature bearings are suitable for various types of industrial equipment, small rotary motors, etc. Recently, there has been an increase in the demand for miniaturization, weight reduction, and thin-walled type of these devices.
Main applications: office equipment, micro motors, soft drives, pressure rotors, dental drills, hard disk motors, stepper motors, video recorder drums, toy models, computer fans.
One-way miniature bearings are widely used in automobiles, electric vehicles, motorcycles, bicycles, printing, textiles, agricultural machinery, lifting, mining and metallurgy, ships, aviation, military industry and other fields.
Squash ball bearings are bearings whose inner diameter and outer diameter ratio are less than a specified value. When the ratio of the bearing outer diameter to the bearing inner diameter is less than 1.25, it is called a thin section ball bearing. This means that the value of the bearing’s outer diameter-inner diameter is very small and the bearing wall is very thin, so it is called a thin-section ball bearing. Thin-section ball bearings require high precision. Because their walls are very thin, the weight they can carry is also very low, and their impact resistance is very poor. Therefore, the choice must be made according to the use environment! ! Thin-walled ball bearings have a simple structure and are easy to use. It is mainly used to bear radial loads, but when the radial clearance of the bearing is increased, it has certain performance of angular contact ball bearings and can bear combined radial and axial loads. When the rotation speed is high and it is not suitable to use thrust ball bearings, it can also be used to bear pure axial load. Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient and a high limit speed. But it is not impact resistant and not suitable for bearing heavy loads.
Main applications: aircraft, aerospace, astronomical instruments and clamping equipment, food processing equipment, glass production equipment and rotating tables, machine tools, packaging equipment, medical equipment, optical scanning equipment, radar, satellite communication equipment, textile machinery, robots and Semiconductor manufacturing equipment and other industries.