Yantai Bonway Manufacturer

Thrust bearing

Thrust bearings are generally composed of two thrust washers or more thrust washers and several rolling elements. Generally, thrust washers are divided into shaft pieces and seat pieces. The most common type of rolling elements is generally made of iron or copper. The quality cage is combined into a whole. The most common type of bearing is a steel ball thrust bearing.

definition:
Thrust bearing is a special bearing used to bear the axial force, which is the bearing of the force in the direction parallel to the shaft. Thrust bearing is also called thrust bearing.

working principle:
Thrust ball bearing is a separable bearing. The shaft ring and seat ring can be separated from the cage and steel ball components. The shaft ring is the ring that matches the shaft, and the seat ring is the ring that matches the bearing housing hole, and there is a gap between the shaft; the thrust ball bearing can only bear the axial load, and the one-way thrust ball bearing can only bear Axial load in one direction, two-way thrust ball bearings can bear axial loads in two directions; thrust ball bearings can not limit the radial displacement of the shaft, the limit speed is very low, one-way thrust ball bearings can limit one of the shaft and the housing The two-way bearing can limit the axial displacement in two directions. Thrust roller bearings are used to withstand combined axial and radial loads that are dominated by axial loads, but the radial load must not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has lower friction factor, higher speed, and has self-aligning performance. The rollers of type 29000 bearings are asymmetrical spherical rollers, which can reduce the relative sliding of the rollers and raceways in operation, and the rollers are long, large in diameter, large in number of rollers, and high in load capacity. They are usually lubricated by oil. , Grease lubrication can be used in individual low-speed situations. In the design and selection, priority should be given to selection; 80000 type thrust cylindrical roller bearings, 90000 type thrust tapered roller bearings and AXK type thrust needle roller bearings can withstand unidirectional axial load, which is higher than that of thrust ball bearings. The load capacity is much larger, and the rigidity is large, and the axial space is small. Thrust cylindrical roller bearings and thrust needle roller bearings are suitable for low-speed occasions, thrust tapered roller bearings have a slightly higher speed than thrust cylindrical roller bearings.

Application classification:
Thrust bearings are divided into thrust ball bearings and thrust roller bearings. Thrust ball bearings are divided into thrust ball bearings and thrust angular contact ball bearings. The raceway ring that is matched with the shaft is composed of a washer with a raceway, a ball and a cage assembly As the shaft ring, the raceway ring that matches the housing is called the seat ring. Two-way bearings match the middle ring with the shaft. One-way bearings can bear one-way axial loads, and two-way bearings can bear two-way axial loads. Seat ring installation Bearings with spherical surfaces have self-aligning performance, which can reduce the influence of installation errors. This type of bearing is mainly used in automobile steering mechanisms and machine tool spindles. Thrust roller bearings are divided into thrust cylindrical roller bearings, thrust spherical roller bearings, and thrust Tapered roller bearings, thrust needle roller bearings. Thrust cylindrical roller bearings are mainly used in oil drilling rigs, iron and steel machinery. Thrust spherical roller bearings are mainly used in hydroelectric generators, vertical motors, and ship propellers. Shafts, tower cranes, extruders, etc. Thrust tapered roller bearings. The main uses of these bearings: one-way: crane hooks, oil rig swivels. Two-way: rolling mill roll necks. Planar thrust bearings mainly bear the axial direction in the assembly Load, its application is wide. Although the installation and operation of thrust bearings are relatively simple, errors often occur during actual maintenance, that is, the installation positions of the tight and loose rings of the bearing are not correct. As a result, the bearing loses its function and the journal is quickly worn. The tightening ring is installed on the end face of the stationary part, that is, wrong assembly. The inner ring of the tight ring and the journal are in transitional fit. When the shaft rotates, the tight ring is driven and friction occurs with the end surface of the stationary part. When the axial force (Fx) is applied, the friction torque will be greater than the resistance torque of the inner diameter fit, resulting in tight Forced rotation of the mating surface of the ring and the shaft increases the wear of the journal.

Precautions:
Pay attention to the following points when installing the thrust bearing. (1) Distinguish the tight ring and loose ring of the bearing (judging according to the inner diameter of the bearing, the difference in the diameter of the hole is 0.1～0.5mm). (2) Distinguish the static parts of the mechanism (that is, the parts that do not move, mainly refer to the assembly). (3) No matter what the situation, the loose ring of the bearing should always lean against the end face of the stationary part.

Application:
Bearing function:
In terms of its function, it should be support, that is, it is used to support the shaft literally, but this is only part of its function. The essence of support is to be able to bear radial loads. It can also be understood as it is used to fix the shaft. The automatic selection of bearings is included. It is to fix the shaft so that it can only achieve rotation, while controlling its axial and radial movement. The motor cannot work at all without bearings. Because the shaft may move in any direction, and the motor is required to only rotate when it is working. Theoretically speaking, it is impossible to achieve the role of transmission. Not only that, the bearing will also affect the transmission. In order to reduce this effect, good lubrication must be achieved on the bearings of the high-speed shaft. Some bearings are already lubricated, which are called pre-lubricated bearings. Most bearings must have lubricating oil. When running at high speed, friction will not only increase energy consumption, but even more terrible is that it is easy to damage the bearings. The idea of ​​turning sliding friction into rolling friction is one-sided, because there is something called sliding bearings.

lubricating
The lubrication purpose of the rolling bearing is to reduce the internal friction and wear of the bearing to prevent sticking; to extend its service life; to discharge frictional heat and cooling to prevent the bearing from overheating and prevent the lubricating oil from aging; also to prevent foreign matter from intruding into the bearing, or to prevent rust and corrosion The effect.
Lubrication method:
Bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to choose a lubrication method suitable for the use conditions and purpose. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. The advantages and disadvantages of grease lubrication and oil lubrication are compared. Pay special attention to the amount when lubricating, whether it is oil lubrication or grease lubrication, too little lubrication and insufficient lubrication will affect the life of the bearing, and too much will produce large resistance and affect the speed.

seal
The sealing of the bearing can be divided into two types: self-sealing and external sealing. The so-called bearing with its own seal is to make the bearing itself into a device with sealing performance. Such as bearings with dust cover, sealing ring, etc. This kind of seal occupies a small space, is convenient to install and disassemble, and the cost is relatively low. The so-called bearing with external sealing performance means that a sealing device with various performances is manufactured inside the installation end cover. Bearing external seal is divided into non-contact seal and contact seal. Among them, the non-contact seal is suitable for high-speed and high-temperature occasions, and has different structural forms such as gap type, labyrinth type and gasket type. Contact seal is suitable for medium and low speed working conditions, and commonly used structural forms such as felt seal and cup seal.

The working principle of thrust bearing:
Thrust ball bearing is a separable bearing. The shaft ring and seat ring can be separated from the cage and steel ball components. The shaft ring is a ferrule that matches the shaft, and the seat ring is a ferrule that matches the bearing seat hole, and there is a gap between it and the shaft;
The role of the bearing: in terms of its role, it should be support, that is, it is used to support the shaft literally, but this is only part of its role. The essence of support is to be able to bear radial loads. It can also be understood as it is used to fix the shaft.

Thrust ball bearings can only bear axial loads, one-way thrust ball bearings can only bear axial loads in one direction, and two-way thrust ball bearings can bear axial loads in two directions;
Thrust ball bearings cannot limit the radial displacement of the shaft, and the limit speed is very low. One-way thrust ball bearings can limit the axial displacement of the shaft and the housing in one direction, and double-direction bearings can limit the axial displacement in two directions.
Bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to choose a lubrication method suitable for the use conditions and purpose. If only lubrication is considered, the lubricity of oil lubrication is dominant.

Thrust bearing is a special bearing used to bear the axial force, which is the bearing of the force in the direction parallel to the shaft. Thrust bearings are also called thrust bearings. Thrust bearings are generally composed of two thrust washers or more thrust washers and several rolling elements. Generally, thrust washers are divided into shaft pieces and seat pieces. The most common type of rolling elements is generally made of iron or copper. The quality cage is combined into a whole. The most common type of bearing is a steel ball thrust bearing.　　 Thrust ball bearing is a separable bearing. The shaft ring and seat ring can be separated from the cage and steel ball components. The shaft ring is the ring that matches the shaft, and the seat ring is the ring that matches the bearing housing hole, and there is a gap between the shaft; the thrust ball bearing can only bear the axial load, and the one-way thrust ball bearing can only bear Axial load in one direction, two-way thrust ball bearings can bear axial loads in two directions; thrust ball bearings can not limit the radial displacement of the shaft, the limit speed is very low, one-way thrust ball bearings can limit one of the shaft and the housing The two-way bearing can limit the axial displacement in two directions.　

　

Thrust roller bearings are used to withstand combined axial and radial loads that dominate axial loads, but the radial load must not exceed 55% of the axial load. Compared with other thrust roller bearings, this kind of bearing has lower friction factor, higher speed, and has self-aligning performance. The sticks of the 29000 bearing are asymmetric spherical rollers, which can reduce the relative sliding of the rollers and the raceway in the work, and the rollers are long and large in diameter, the number of rollers is large, and the load capacity is high. Oil lubrication is usually used. Grease can be used for individual low-speed conditions. In the design and selection, priority should be given to selection; 80,000 type thrust cylindrical roller bearings, 90000 type thrust tapered roller bearings and AXK type thrust needle roller bearings can withstand unidirectional axial load, which is higher than that of thrust ball bearings. The load capacity is much larger, and the rigidity is large, and the axial space is small. Thrust cylindrical roller bearings and thrust needle roller bearings are suitable for low-speed occasions, thrust tapered roller bearings have a slightly higher speed than thrust cylindrical roller bearings.