Bearing classification

Bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy (accuracy).
Bearing classification
Plain bearing
Sliding bearings have neither inner and outer rings nor rolling elements, and are generally made of wear-resistant materials. Commonly used in low speed, light load and mechanical rotating parts that are difficult to lubricate and maintain.
spherical plain bearing
The sliding contact surface of the spherical plain bearing is spherical, which is mainly suitable for swing motion, tilt motion and rotary motion.
rolling bearing
Rolling bearings are divided into radial bearings and thrust bearings according to the load direction or nominal contact angle they can bear. The radial contact bearing is a radial bearing with a nominal contact angle of 0, and the radial angular contact bearing is a radial bearing with a nominal contact angle greater than 0 to 45. Axial contact bearings are thrust bearings with a nominal contact angle of 90, and thrust angular contact bearings are thrust bearings with a nominal contact angle greater than 45 but less than 90.
According to the shape of the rolling elements, it can be divided into ball bearings and roller bearings. Roller bearings are divided into cylindrical roller bearings, needle roller bearings, tapered roller bearings and spherical roller bearings according to the types of rollers.
According to whether it can be self-aligning during operation, it can be divided into self-aligning bearings----the raceway is spherical, which can adapt to the angular deviation and angular motion between the two raceways axis lines and non-aligning bearings (rigid bearings) ---- Bearings that can resist the angular deviation of the axis line between the raceways.
According to the number of rows of rolling elements, it is divided into single-row bearings, double-row bearings and multi-row bearings.
According to whether its parts (rings) can be separated, it can be divided into separable bearings and non-separable bearings.
According to its structural shape (if there is no filling groove, whether there is inner and outer ring and the shape of the ferrule, the structure of the rib, and even whether there is a cage, etc.), it can also be divided into various structural types.
According to its outer diameter, it is divided into miniature bearings (<26mm), small bearings (28-55mm), medium and small bearings (60-115), medium and large bearings (120-190mm), large bearings (200-430mm) and special bearings. Large bearing (>440mm).
According to the application field, it is divided into motor bearings, rolling mill bearings, main bearings, etc.
According to the material, it is divided into ceramic bearings, plastic bearings, etc.
Deep groove ball bearings
Deep groove ball bearings
Deep groove ball bearings
Deep groove ball bearings are the most representative rolling bearings. Compared with other types of bearings with the same size, this type of bearing has a small friction coefficient, high limit speed, simple structure, low manufacturing cost, high precision, no need for frequent maintenance, and has a large size range and many forms. It is the most widely used type. bearing. It mainly bears radial load, but also can bear certain axial load. When it is only subjected to radial load, the contact angle is zero.
After the Deep Groove Ball Bearing is mounted on the shaft, within the axial clearance range of the bearing, the axial displacement of the shaft or the housing can be limited in two directions, so it can be used for axial positioning in both directions. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can bear a large axial load. Under high-speed operation conditions with large axial load, deep groove ball bearings are more advantageous than thrust ball bearings. In addition, this type of bearing also has a certain self-aligning ability. When it is inclined 2′~10′ relative to the housing hole, it can still work normally, but it has a certain influence on the bearing life.
Angular contact ball bearings
It is generally customary to call the six types of bearings represented by 36 and 46 type bearings, and the angular contact is generally 15 degrees, 25 degrees, 45 degrees, etc.
Self-aligning ball bearings
Self-aligning ball bearings
Self-aligning ball bearings
Self-aligning ball bearings are bearings equipped with spherical balls between the inner ring of two raceways and the outer ring of which the raceways are spherical. The center of curvature of the outer ring raceway surface is consistent with the center of the bearing, so it has the same self-aligning function as the self-aligning ball bearing. When the shaft and housing are deflected, they can be adjusted automatically without increasing the bearing burden. Spherical roller bearings can withstand radial loads and axial loads in two directions. Self-aligning ball bearings have a large radial load capacity and are suitable for heavy loads and shock loads. The inner diameter of the inner ring is a bearing with a tapered bore, which can be directly mounted. Or install it on the cylindrical shaft using an adapter sleeve and a dismantling sleeve. The cage is made of steel stamping cage and polyamide forming. Self-aligning ball bearings are suitable for heavy loads and shock loads, precision instruments, low-noise motors, automobiles, motorcycles, metallurgy, rolling mills, mining, petroleum, paper, cement, press Sugar and other industries and general Machinery.
Thrust ball bearing
Thrust ball bearings are divided into one-way and two-way. They can only carry axial loads and must not carry any radial loads. Thrust bearing is divided into two parts: tight ring and moving ring. The tight ring is tight with the shaft sleeve, and the moving ring is supported on the bearing seat. Rings and rolling elements are usually made of rolling bearing steel with high strength and good wear resistance, and the surface hardness after quenching should reach HRC60-65. The cage is mostly made of mild steel stamping, and can also be made of copper alloy cloth bakelite or plastic.
Two-way thrust angular contact ball bearings
Double row tapered roller bearings
Double row tapered roller bearings
The contact angle of thrust angular contact ball bearings is generally 60°. Commonly used thrust angular contact ball bearings are generally bidirectional thrust angular contact ball bearings, which are mainly used for precision machine tool spindles. It has the advantages of high precision, good rigidity, low temperature rise, high speed, and convenient assembly and disassembly.
Thrust Roller Bearings
Including thrust cylindrical roller bearings, thrust tapered roller bearings, thrust needle roller bearings and thrust spherical roller bearings.
Needle Roller Bearings
Needle Roller Bearings
Needle Roller Bearings
Needle roller bearings are equipped with thin and long rollers (the length of the roller is 3~10 times the diameter, and the diameter is generally not more than 5mm), so the radial structure is compact, and its inner diameter and load capacity are the same as other types of bearings. The smallest diameter, especially suitable for supporting structures with limited radial installation size. Needle roller bearings can choose bearings without inner rings or needle roller and cage assemblies according to different applications. The surface of the hole is directly used as the inner and outer rolling surfaces of the bearing. In order to ensure the same load capacity and running performance as the bearing with ring, the hardness, machining accuracy and surface quality of the surface of the shaft or housing hole raceway should be the same as that of the bearing ring. Needle bearing is a bearing unit composed of radial needle roller bearing and thrust bearing components. It has a compact structure, small volume and high rotation accuracy. It can bear a certain axial load while bearing a high radial load. And the product structure is diverse, adaptable and easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other mechanical equipment, and can make the mechanical system design very compact and flexible.
Outer spherical ball bearing
The outer diameter surface of the outer ring of the outer spherical ball bearing is spherical, which can play the role of self-alignment.
Spherical roller bearing
Spherical roller bearing
Spherical roller bearing
Spherical roller bearings have two rows of symmetrical spherical rollers, which mainly bear radial loads, and can also bear axial loads in any direction, but cannot bear pure axial loads. The outer ring raceway of this type of bearing is spherical, so its self-aligning performance is good, and it can compensate for the coaxiality error. When the shaft is bent under force or installed non-concentrically, the bearing can still be used normally. The self-aligning performance varies with the bearing size series. , Generally, the allowable centering angle is 1~2.5 degrees. This type of bearing has a large load capacity. In addition to bearing radial load, the bearing can also bear axial load acting in both directions, and has good impact resistance. Generally, For spherical roller bearings, the allowable working speed is lower. Suitable for working under heavy or vibrating loads.
flange bearing
Flanged bearings have flanged flanges on the outer wheel. The characteristic is that it can simplify the structure of the main engine, reduce the size of the main engine, and make the bearing easier to locate.
Pillow block bearing
An assembly of a radial bearing and a seat that has a base plate for mounting screws on a support surface parallel to the bearing axis.
Combined bearing
A set of rolling bearings composed of the above two or more bearing structures at the same time. Such as needle roller and thrust cylindrical roller combined bearing, needle roller and thrust ball combined bearing, needle roller and angular contact ball combined bearing, etc.
Linear Bearings
Linear bearings are divided into metal linear bearings and plastic linear bearings.
Metal Linear Bushings are low-cost production Linear Motion systems for use with cylindrical shafts with infinite travel. Since the bearing ball is in point contact with the shaft, the operating load is small. The steel ball rotates with minimal frictional resistance, resulting in a smooth motion with high precision.
The plastic Linear Bearing is a Linear Motion System with self-lubricating characteristics. The biggest difference between the metal linear bearing and the metal linear bearing is that the metal linear bearing is rolling friction, and the point contact between the bearing and the cylindrical shaft, so it is suitable for low-load high-speed motion; Plastic linear bearings are sliding friction, and there is surface contact between the bearing and the cylindrical shaft, so this is suitable for high-load, low-speed motion.