Bearing according to the load direction can be classified as: radial bearing, also known as centripetal bearing, bear radial load.Thrust bearing, also known as thrust bearing, bearing axial load.Radial thrust bearing, also known as radial thrust bearing, both radial and axial load.
According to the different friction properties of bearings, it can be divided into sliding friction bearings (plain bearings) and rolling friction bearings (rolling bearings).
Bearing according to the practical work of different nature and can be divided into: 1. 2. Deep groove ball bearing angular contact ball bearings (3) four-point contact ball bearing 4. 5. Self-aligning ball bearing cylindrical roller bearing 6. Entity type needle roller bearings 7. 8. Tapered roller bearing self-aligning roller bearing 9. Thrust ball bearing 10. 11. Thrust cylindrical roller bearing thrust needle roller bearing 12. 13. Thrust tapered roller bearing thrust spherical roller bearing, etc., bearing classification is as follows:
1. Plain bearing
Sliding bearings are not part of the inner and outer rings there is no rolling body, is generally made of wear - resistant materials.It is often used for low speed, light load, lubricating oil filling and difficult maintenance of mechanical rotating parts.
2. Joint bearing
The sliding contact surface of the joint bearing is spherical, which is mainly used for swinging motion, inclined motion and rotating motion.
3. Rolling bearing
According to the load direction or nominal contact Angle, the rolling bearing can be divided into centripetal bearing and thrust bearing.
According to the shape of the rolling body can be divided into ball bearings and roller bearings.Roller bearings are divided into cylindrical roller bearings, needle roller bearings, tapered roller bearings and centering roller bearings.
According to its work can be divided into aligning bearings - raceway is spherical, can adapt to the two raceway axis line between the angular deviation and angular movement of the bearings and non-aligning bearings (rigid bearings)- can impedance raceway axis line Angle deviation bearings.
According to the number of columns of the rolling body is divided into single row bearing, double row bearing and multi-row bearing.
According to its components (ring) can be separated into separable bearings and non - separable bearings.
According to its structure shape (such as there is no filling groove, there is no shape of inside, outside ring and ring, the structure of retaining edge, even there is no cage, etc.) also can be divided into a variety of structure types.
According to the size of its outer diameter, it is divided into miniature bearings (440mm).
According to the application field is divided into motor bearings, rolling mill bearings, main bearings.
By material cent is ceramic bearing, plastic bearing
4. Deep groove ball bearing
Deep groove ball bearing is the most representative rolling bearing.Compared with other types of bearings of the same size, this kind of bearings have small friction coefficient, high limit speed, simple structure, low manufacturing cost, high precision, and no need for frequent maintenance.It mainly bears the radial load, but also can bear certain axial load.When it only bears radial load, the contact Angle is zero.
5. Adjustable ball bearing
The aligning ball bearing is a bearing fitted with spherical ball balls between the inner ring of two raceway and the outer ring of raceway.The curvature center of the outer ring raceway surface is consistent with the bearing center, so it has the same centering function as the automatic centering ball bearing.When the shaft and housing appear deflection, it can be automatically adjusted, without increasing the bearing burden.
6. Thrust ball bearing
Thrust ball bearings are divided into one - way and two - way.They can only bear axial load, and can never bear any radial load.Thrust bearing is divided into two parts: compact ring and flexible ring.The tight ring is tight with the axle sleeve, and the loose ring is supported on the bearing pedestal.The ring and rolling body are usually made of rolling bearing steel with high strength and good wear resistance. After quenching, the surface hardness should reach HRC60 ~ 65.The cage is made of soft steel stamping. It can also be made of copper alloy laminated bakelwood or plastic.
7. Two-way thrust angular contact ball bearing
Thrust angular contact ball bearing contact Angle 60 ° commonly used thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings, mainly used for precision machine tool spindle, commonly used together with the double row cylindrical roller bearing, it can be subject to bi-directional load and have high precision, good rigidity, low temperature, high speed, convenient installation.
8. Thrust roller bearing
It includes thrust cylindrical roller bearing, thrust tapered roller bearing, thrust needle roller bearing and thrust centering roller bearing.
Needle roller bearing
Needle bearing with fine and long roller (3 ~ 10 times the diameter of the roller length is, no more than 5 mm in diameter), so the radial structure is compact, its diameter and load capacity at the same time, with other types of bearing outside diameter to a minimum, especially suitable for the limited size of the radial installation support structure. Needle roller bearing according to the use of different occasions, can be used without inner ring of the bearing or needle roller and cage components, at this time to suit the bearing surface of the surface of the shaft and the shell hole as inner and outer rolling bearing surface directly.
In order to ensure the load capacity and operation performance and you have the same ring bearing, axis or shell hole hardness on the surface of the raceway, the machining accuracy and surface quality and bearing ring. Use combination of needle roller bearing is a centripetal needle bearing and thrust bearing components of bearing unit, the compact structure small volume, rotation of high precision, high in can bear radial load at the same time absorb a certain amount of axial load.
And the product structure is diverse, wide adaptability, easy to install.Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery, printing machinery and other mechanical equipment, and can make the mechanical system design is very compact and agile.
10. 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 center adjustment.
11. Adjustable roller bearing
There are two symmetrical spherical roller bearing, mainly bearing radial load, but also can bear any direction of the axial load, but can not bear the pure axial load.The raceway of the outer ring of this kind of bearing is spherical, so its centering performance is good, can compensate for the error of coaxiality, when the shaft is bent under stress or when the bearings are installed in different centers, the bearings can still be used normally, the centering varies with the bearing size series.Suitable for working under heavy load or vibration load.
12. Flange bearing
Flange bearing outer wheel with flange flange.Features can simplify the structure of the main engine, reduce the size of the main engine, so that the bearing is easier to locate.
13. Bearing with seat
A component of a centripetal bearing coupled to a seat having a base plate for mounting screws on a support surface parallel to the axis of the bearing.
14. Combination bearing
A set of bearings is composed of two or more types of bearing structures.Such as needle and thrust cylindrical roller combination bearing, needle and thrust ball combination bearing, needle and angular contact ball combination bearing.
15. Linear bearing
Linear bearings are divided into metal linear bearings and plastic linear bearings.
Metal linear bearing is a linear motion system produced at low cost, which is used for infinite travel in conjunction with cylindrical shaft.Because the bearing ball is in contact with the shaft, the load is small.The steel ball rotates with minimal frictional resistance to achieve smooth motion with high precision.
Plastic linear bearing is a linear motion system with self-lubricating characteristics. The biggest difference between it and metal linear bearing is that the metal linear bearing is rolling friction, and the bearing and cylindrical shaft are point contact.While the plastic linear bearing is sliding friction, the bearing and the cylindrical shaft is surface contact, so this is suitable for high load medium and low speed motion.