Non-standard bearings: What are the classifications of bearings?
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2023/01/14
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Non-standard bearings: What are the classifications of bearings?
Speaking of "bearing", you will be familiar with it. Almost all rotating places will have bearings, such as fans, motors, transport vehicles, etc. So non-standard bearings: What are the classifications of bearings?
Non-standard bearings: What are the classifications of bearings?
Ordinary bearings are divided into plain bearings, plain bearings and rolling bearings. The sliding bearing has no inner and outer rings and no rolling element, and is generally made of wear-resistant materials. It is often used for rotating parts of machinery with low speed, light load, lubricating oil filling and difficult maintenance. The sliding contact surface of the joint is spherical, which is mainly applicable to swing, tilt and rotation.
Rolling bearing is generally composed of inner ring, outer ring, rolling body and cage. The function of the inner ring is to rotate with the shaft; The function of the outer ring is to cooperate with the bearing seat and play a supporting role;
Non-standard bearings: What are the classification of rolling bearings?
1. Self-aligning ball bearing
Self-aligning ball bearing is a bearing with spherical ball between the inner race of two raceways and the outer race with spherical raceways. The curvature center of the outer ring raceway surface is consistent with the bearing center, so it has the same centering function as the self-aligning ball bearing. When the shaft and shell are bent, they can be adjusted automatically without increasing the bearing burden.
2. Cylindrical roller bearing
Cylindrical rollers and raceways are linear contact bearings. Large bearing capacity, mainly bearing radial load. The friction between the roller and the collar stop is small, suitable for high-speed rotation. There are NU, NJ, NUP, N, NF single-row cylindrical roller bearings and NNU, NN double-row cylindrical roller bearings according to the flange. The bearing is a structure in which the inner ring and outer ring can be separated. As shown in the figure:
3. Self-aligning roller bearing
Self-aligning roller bearing has two rows of rollers, which mainly bear radial load and can also bear axial load in any direction. It has high radial bearing capacity, especially suitable for working under heavy load or vibration load, but can not bear pure axial load. The outer race of the bearing is spherical, with good centering performance and can compensate for the coaxiality error.
4. Spiral roller bearing
The rolling system of spiral bearing adopts spiral roller wrapped with steel belt. Therefore, it is called spiral roller bearing. This kind of bearing has large elasticity, large radial clearance, can bear large impact radial load, can not bear axial load, and low limit speed. It is only applicable to parts with low rotation accuracy and often large impact load.
5. Angular contact ball bearing
There are raceways on the inner and outer rings of angular contact ball bearings, and the inner and outer rings can move relative along the bearing axis. This kind of bearing is especially suitable for bearing compound load, namely, the load acting both radially and axially. The axial bearing capacity of angular contact ball bearing increases with the increase of contact angle. The contact angle is the angle between the contact point line of the ball and raceway on the radial plane and the vertical line of the bearing axis.
6. Tapered roller bearing
The ability of single-row tapered roller bearing to bear axial load depends on the contact angle, namely the raceway angle of the outer ring. The greater the angle, the greater the axial bearing capacity. Among tapered roller bearings, single-row tapered roller bearings are the most widely used. Small double-row tapered roller bearing is used for the front wheel hub of automobile. Four-row tapered roller bearings are used for heavy machines such as large cold rolling mills and hot rolling mills.
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Non-standard bearing condition requirements and technical countermeasures
Not to mention the carbon content, hardness, wear resistance, roughness and consistency of steel balls and ferrules. Regardless of the specific appearance, there are ferrous metal cages, non-metallic cages and non-ferrous metal cages. MC1, MC2, MC3, MC4 and MC5 can be selected according to the fit tolerance; The accuracy of P0, P6, P5 and P4 can be selected according to the purpose; Hundreds of greases can be selected from high temperature to low temperature according to working conditions, and small pictures are attached at will: In this sense, we say that bearings are not standard parts. According to the specific use conditions, I can provide 608 bearings with different performance for your choice. In order to standardize, the parameters of bearings (size, sealing form, retaining frame material, clearance, oil, grease, etc.) should be limited. Conclusion: For non-standard bearings, they cannot be simply regarded as standard parts, but the meaning of non-standard parts should be understood. Then, I will give you a diagram of bearing condition requirements and technical countermeasures. Only by knowing the working conditions of your own products can you choose the right products. Thrust cylindrical roller bearing. It is composed of washer raceway ring (shaft ring, seat ring), cylindrical roller and cage assembly. Bearing type Full-cylinder roller is produced and processed with convex surface. The pressure distribution on the roller and raceway surface is uniform. It can bear one-way axial load, with large axial load capacity and strong axial stiffness. Application field: oil drilling rig, iron and steel machinery. Thrust needle roller bearing. The separated non-standard bearing is composed of raceway ring, needle roller and cage assembly, which can be combined with the stamping of thin raceway ring or cutting of thick raceway ring. Non-release bearing is an integral bearing composed of precision stamping raceway ring, needle roller and cage assembly, which can bear one-way axial load. These bearings take up less space, which is conducive to the compact design of machinery. Most only select the needle roller and cage assembly, while the assembly surface of the shaft and housing is used as the raceway surface. Application field: transmission of automobiles, cultivators, machine tools, etc. Thrust tapered roller bearing. This non-standard bearing is equipped with a round table roller (the big end is spherical), which is accurately guided by the rib of the raceway ring (shaft ring, seat ring). In design, the apex of the cone surface of the shaft ring, race raceway surface and roller rolling surface intersects at a point on the bearing centerline. One-way bearing can bear one-way axial load, and two-way bearing can bear two-way axial load. One-way application: crane hook, oil rig swivel. Two-way: mill roll neck. Turntable bearing. The non-standard bearing of the turntable has high axial and radial bearing capacity, high tilt stiffness and high accuracy, and is suitable for the non-standard bearing configuration in the turntable, measurement and experiment. When installing this bearing, it is necessary to control the torque of the mounting screws. 10、 Rotary table bearing and non-standard customized type. The turntable bearing can bear large radial load, axial load and overturning torque at the same time. It integrates support, rotation, transmission, fixation and other functions. It is compact in structure, simple in installation and convenient in maintenance. It is usually used in low-speed situations such as lifting machinery, excavators, turntables, wind turbines, astronomical telescopes, tank turrets, and is widely used.
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Non-standard bearings: What are the basic concepts and characteristics of deep groove ball bearings?
Non-standard bearing manufacturers said: with the continuous development of China's heavy industry, some parts commonly used in the construction and engineering fields have also surfaced. Deep groove ball bearing is actually a rolling bearing composed of inner ring, outer ring and other parts. Simple structure, durability, environmental protection, firmness, fast running speed, no need for regular maintenance and cleaning. The utility model has the advantages of convenient operation, small friction coefficient and wide application range. Various types of deep groove ball bearings can be used in different parts of the product. The following are the basic concepts and characteristics of non-standard bearing manufacturers:
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Maintenance procedures and precautions for thin-walled bearings
Do not install it hard on the ball, which will lead to local overload of the ball and contact surface and premature failure of the bearing. Do not use hammer, screwdriver and other hard tools to hit the bearing surface, which will break or embrittle the outer ring of the bearing.
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2023/01/14
Understand the thin-wall bearing maintenance procedures
The lubrication purpose of thin wall bearings is to reduce the internal friction and wear of bearings and prevent burning and sticking. The lubrication effect is as follows. Reduce friction and wear. The metal contact is prevented and the friction and wear are reduced in the contacting part of the ring, rolling element and retainer of the bearing. Rolling fatigue life that extends the fatigue life. When the rolling contact surface is well lubricated during rotation, the rolling fatigue life will be extended. On the contrary, if the oil viscosity is low and the lubricating oil film thickness is not good, it will be shortened.
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