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Bearing classification

Update:01-11-2019
Summary:

Sliding bearing Sliding bearings are not divided into i […]

Sliding bearing
Sliding bearings are not divided into inner and outer rings and have no rolling elements, and are generally made of wear-resistant materials. Commonly used for low speed, light load and lubrication, and mechanical rotation of difficult maintenance.
Joint bearing
The sliding contact surface of the joint bearing is spherical, and is mainly suitable for oscillating motion, tilting motion and rotational motion.
Rolling bearing
Rolling bearings are divided into radial bearings and thrust bearings according to the load direction or nominal contact angle they can withstand. 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. The axial contact bearing is a thrust bearing with a nominal contact angle of 90, and the thrust angular contact bearing is a thrust bearing with a nominal contact angle greater than 45 but less than 90.
According to the shape of the rolling element, it can be divided into a ball bearing and a roller bearing. Roller bearings are divided into roller types: cylindrical roller bearings, needle roller bearings, tapered roller bearings and spherical roller bearings.
According to the work, it can be divided into self-aligning bearings----the raceway is spherical, and can adapt to the angular deviation and angular movement between the two raceways and the non-aligning bearings (rigid bearings) A bearing that can offset the axial angle of the track 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.
Divided into separable bearings and non-separable bearings according to whether their components (ferrules) can be separated.
According to its structural shape (if there is no filling groove, the shape of the inner and outer rings and the ferrule, the structure of the rib, even the presence or absence of the cage) can also be divided into various structural types.
According to its outer diameter size, it is divided into miniature bearing (<26mm), small bearing (28-55mm), medium and small bearing (60-115), medium and large bearing (120-190mm), large bearing (200-430mm) and special Large bearings (>440mm).
According to the application field, it is divided into motor bearings, rolling mill bearings, main bearings and so on.
Divided into ceramic bearings, plastic bearings, etc.
Deep groove ball bearing
Deep groove ball bearings are the most representative rolling bearings. Compared with other types of bearings of the same size, this type of bearing has the lowest friction coefficient, high speed limit, simple structure, low manufacturing cost, high precision, no need for frequent maintenance, and large size and form. It is the most widely used type. Bearing. It is mainly subjected to radial loads and can also withstand certain axial loads. When it is only subjected to radial loads, the contact angle is zero.
After the deep groove ball bearing is mounted on the shaft, the axial displacement of the shaft or the casing can be restricted within the axial clearance of the bearing, so that the axial positioning can be performed 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 withstand a large axial load. Deep groove ball bearings are superior to thrust ball bearings in high-speed operating conditions with large axial loads. In addition, this kind of bearing also has a certain ability of self-aligning. When it is inclined 2'~10' with respect to the hole of the casing, it can still work normally, but it has certain influence on bearing life.
Angular contact ball bearings
Generally referred to as the 36 type bearing represented by 36, 46 type bearings, the angular contact is generally 15 degrees, 25 degrees, 45 degrees and so on.

Self-aligning ball bearing

The self-aligning ball bearing is a bearing equipped with a spherical ball between the inner ring of the two raceways and the outer ring of the spherical raceway. The center of curvature of the outer raceway surface is identical to the center of the bearing, so it has the same self-aligning function as the self-aligning ball bearing. When the shaft and outer casing are deflected, they can be adjusted automatically without increasing the bearing load. Spherical roller bearings can withstand radial loads and axial loads in both directions. The self-aligning ball bearing has a large radial load capacity and is suitable for heavy load and impact load. The inner ring inner diameter is a tapered bore bearing that can be mounted directly. Or use the adapter sleeve and the removal cylinder to mount on the cylindrical shaft. The cage is made of steel stamping cage and polyamide forming. Self-aligning ball bearings are suitable for bearing heavy loads and impact loads, precision instruments, low noise motors, automobiles, motorcycles, metallurgy, rolling mills, mining, petroleum, paper, cement, and pressing. Sugar and other industries and general machinery.
Thrust ball bearing
Thrust ball bearings are divided into one-way and two-way. They can only withstand axial loads and must not withstand any radial loads. The thrust bearing is divided into two parts: a tight ring and a live ring. The tight ring and the sleeve are tight, and the ring is supported on the bearing housing. The ferrule and the rolling element are usually made of rolling bearing steel with high strength and good wear resistance. The surface hardness after quenching should reach HRC60-65. The cage is made of soft steel stamping, and can also be made of copper alloy cloth bakelite or plastic.
Two-way thrust angular contact ball bearing

Double row tapered roller bearing
Thrust angular contact ball bearing contact angle is generally 60°. Commonly used thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings. They are mainly used for precision machine tool spindles. They are generally used together with double row cylindrical roller bearings to withstand bidirectional shafts. The load has the advantages of high precision, good rigidity, low temperature rise, high speed, convenient assembly and disassembly.
Thrust roller bearing
Including thrust cylindrical roller bearings, thrust tapered roller bearings, thrust needle roller bearings and thrust spherical roller bearings.

Needle bearing
Needle roller bearings are equipped with thin and long rollers (the length of the roller is 3 to 10 times the diameter and the diameter is generally not more than 5 mm), so the radial structure is compact, and the inner diameter and load capacity are the same as those of other types of bearings. The smallest diameter, especially suitable for radial mounting size limited support structure. Needle roller bearings can be selected according to different applications, the inner ringless bearing or needle roller and cage assembly, the journal surface and outer casing matched with the bearing The surface of the hole directly serves as the inner and outer rolling surface of the bearing. To ensure the load capacity and running performance, the hardness of the raceway surface of the shaft or the outer casing hole is the same as that of the ferrule bearing. The machining accuracy and surface quality should be combined with the bearing ring. The needle bearing is a bearing unit composed of a combination of a radial needle roller bearing and a thrust bearing component. The compact structure is small, the rotation precision is high, and it can withstand a certain axial load while receiving a high radial load. And the product structure is diverse, adaptable and easy to install. Combined needle roller bearings are widely used in various mechanical equipment such as machine tools, metallurgical machinery, textile machinery and printing machinery, and can make the mechanical system design very compact and dexterous.
Spherical ball bearing
The outer diameter of the outer ring of the outer spherical ball bearing is spherical, which can serve as a centering function.

Spherical roller bearing
Spherical roller bearings have two rows of symmetrical spherical rollers that are primarily subjected to radial loads and can also withstand axial loads in either direction, but cannot withstand pure axial loads. The outer ring raceway of this type of bearing is spherical, so its self-aligning performance is good, and the coaxiality error can be compensated. When the shaft is bent or installed with different cores, the bearing can still be used normally. The self-aligning function varies with the bearing size series. Generally, the allowable centering angle is 1~2.5 degrees. The bearing capacity of this type of bearing is large. In addition to being able to withstand the radial load, the bearing can also bear the axial load of two-way action, and has better impact resistance. In other words, spherical roller bearings allow for lower operating speeds. Suitable for working under heavy or vibration loads.

Flange bearing
The flange bearing has a flanged flange on the outer wheel. The feature is to simplify the mainframe structure, reduce the size of the mainframe, and make the bearing easier to position.

Bearing with seat
A combination of a radial bearing and a seat has a mounting plate on the support surface parallel to the bearing axis.

Combined bearing
A set of rolling bearings bearing a combination of the above two or more bearing structures. Such as needle roller and thrust cylindrical roller combination bearings, needle roller and thrust ball combination bearings, needle roller and angular contact ball combined bearings.

Linear Bearings
Linear bearings are divided into metal linear bearings and plastic linear bearings.
Metal linear bearings are linear motion systems that are produced at low cost for use with infinite strokes in conjunction with cylindrical shafts. Since the carrier ball is in point contact with the shaft, the load used is small. The steel ball rotates with a very small frictional resistance, so that high-precision smooth motion can be obtained.
The plastic linear bearing is a self-lubricating linear motion system. The biggest difference between the metal linear bearing is that the metal linear bearing is rolling friction, and the bearing is in point contact with the cylindrical shaft, so this is suitable for low-load high-speed motion; The plastic linear bearing is sliding friction, and the bearing is in surface contact with the cylindrical shaft, so this is suitable for high-load medium-low speed movement.

 

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