Bearing is an important part in contemporary machinery and equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient (friction coefficient) during its movement, and ensure its rotation accuracy (accuracy).
The early form of linear motion bearings was to place a row of wooden poles under a row of skids. Modern linear motion bearings use the same principle of operation, but sometimes balls are used instead of rollers. The simplest rotary bearing is a sleeve bearing, which is just a bushing sandwiched between the wheel and the axle. This design was subsequently replaced by rolling bearings, which used many cylindrical rollers to replace the original bushings, and each rolling element was like a separate wheel.
China’s bearing industry is developing rapidly, bearing varieties from few to many, product quality and technical level from low to high, the industry scale from small to large, has formed a professional production system with basically complete product categories and reasonable production layout.
Mechanical equipment bearings
Sliding bearings have no inner and outer rings and no rolling elements, and are generally made of wear-resistant materials. Commonly used for low-speed, light-load and lubricating oil, and mechanically rotating parts that are difficult to maintain.
The sliding contact surface of the joint bearing is spherical, which is mainly suitable for swinging motion, tilting motion and rotating motion.
Rolling bearings are divided into radial bearings and thrust bearings according to the different load directions or nominal contact angles 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. Thrust angular contact bearings are thrust bearings with a nominal contact angle greater than 45 but less than 90.
According to the shape of rolling elements, it can be divided into ball bearings and roller bearings. Roller bearings are classified according to roller types: cylindrical roller bearings, needle roller bearings, tapered roller bearings and spherical roller bearings.
It can be divided into self-aligning bearings according to whether it can be self-aligned when working-the raceway is spherical, and the bearings and non-aligning bearings (rigid bearings) that can adapt to the angular deviation and angular movement between the two raceway axis lines —- Bearing 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.
It can be 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 slot, with or without inner and outer ring and ferrule shape, the structure of the rib, or even with a cage, etc.), it can be divided into a variety of structural types.
According to its outer diameter size, it is divided into miniature bearings (<26mm), small bearings (28-55mm), small and medium bearings (60-115), medium and large bearings (120-190mm), large bearings (200-430mm) and special Large bearings (> 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 bearing
Deep groove ball bearings are the most representative rolling bearings. Compared with other bearings of the same size, this type of bearing has a small friction coefficient, high limit speed, simple structure, low manufacturing cost, high accuracy, no need for frequent maintenance, and a large size range and many forms, which is the most widely used type. Bearing. It mainly bears radial load and can also bear certain axial load. When it only bears radial load, the contact angle is zero.
After the deep groove ball bearing is mounted on the shaft, the axial displacement of the shaft or the housing can be limited within the axial clearance range of the bearing, so it can be axially positioned 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. Under high-speed operating conditions with large axial loads, deep groove ball bearings are more advantageous than thrust ball bearings. In addition, this type of bearing also has a certain degree of self-aligning ability. It can still work normally when it is inclined by 2 ′ to 10 ′ relative to the housing hole, but it has a certain impact on the bearing life.
Angular contact ball bearings
It is generally known as six types of bearings represented by 36 and 46 type bearings, and the angular contact is generally 15 degrees, 25 degrees, and 45 degrees.
Self-aligning ball bearings
The self-aligning ball bearing is a bearing equipped with spherical balls between the inner ring of two raceways and the outer ring with a spherical raceway. The center of curvature of the raceway surface of the outer ring 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 casing deflect, it 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 impact loads. The inner diameter of the inner ring is a tapered bore bearing, which can be installed directly. Or use an adapter sleeve and a dismounting cylinder to install on the cylindrical shaft. The cage is made of steel plate stamping cage and polyamide. Self-aligning ball bearings are suitable for bearing heavy and shock loads, precision instruments, low-noise motors, automobiles, motorcycles, metallurgy, rolling mills, mining, petroleum, paper, cement, and squeezing. Sugar and other industries and general machinery.
Thrust ball bearings
Thrust ball bearings are divided into two types: one-way and two-way. They can only withstand axial loads and must never withstand any radial loads. The thrust bearing is divided into two parts: tight ring and loose ring. The tight ring is tight with the shaft sleeve, and the live 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. The surface hardness after quenching should reach HRC60-65. The cage is mostly made of soft steel stamping, or it can be made of copper alloy cloth bakelite or plastic.
Bidirectional thrust angular contact ball bearings
Double row tapered roller bearings
Thrust angular contact ball bearings have a contact angle of generally 60 °. Commonly used thrust angular contact ball bearings are generally bidirectional thrust angular contact ball bearings. They are mainly used in precision machine tool spindles. They are generally used together with double-row cylindrical roller bearings to withstand bidirectional shafts. The direction load has the advantages of high precision, good rigidity, low temperature rise, high speed, easy assembly and disassembly.
Thrust roller bearing
Including thrust cylindrical roller bearings, thrust tapered roller bearings, thrust needle roller bearings and thrust spherical roller bearings.
The needle roller bearing is 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 5mm), so the radial structure is compact, and its inner diameter size and load capacity are the same as other types of bearings. The diameter is the smallest, especially suitable for the support structure with limited radial installation size. Needle roller bearings can be used without inner ring bearings or needle roller and cage assemblies according to the use occasions. At this time, the journal surface and housing matching the bearing The hole surface is directly used as the inner and outer rolling surfaces of the bearing. In order to ensure the load capacity and running performance of the bearing with the ring, the hardness of the surface of the shaft or shell hole raceway, the machining accuracy and surface quality should be combined with the bearing ring. The needle bearing is a bearing unit composed of a radial needle roller bearing and a thrust bearing component. 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 in various forms, wide adaptability 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 smart.
Spherical ball bearing
The outer diameter surface of the outer ring of a spherical ball bearing is spherical, which can play a self-aligning role.
Spherical roller bearing
Spherical roller bearings have two rows of symmetrical spherical rollers, which mainly bear radial loads, and can also withstand axial loads in either direction, but cannot bear pure axial loads. The outer ring raceway of this type of bearing is spherical, so it has good self-aligning performance and can compensate for coaxiality errors. The bearing can still be used normally when the shaft is bent or installed with different centers. Generally, the allowable self-aligning angle is 1 ~ 2.5 degrees. The load capacity of this type of bearing is large. In addition to the radial load, the bearing can also withstand the axial load of two-way action. It has good impact resistance. Generally Spherical roller bearings allow lower operating speeds. Suitable for work under heavy load or vibration load.
The flange bearing has flange flanges on the outer wheel. The feature is that it can simplify the structure of the main machine, reduce the size of the main machine, and make the bearings easier to locate.
Bearing with seat
A type of assembly in which a radial bearing and a seat are combined. There is a base plate with mounting screws on the supporting surface parallel to the axis of the bearing.
Rolling bearings composed of more than two types of bearing structures in one set of bearings. Such as needle roller and thrust cylindrical roller combined bearings, needle roller and thrust ball combined bearings, needle roller and angular contact ball combined bearings, etc.
Linear bearings are divided into metal linear bearings and plastic linear bearings.
The metal linear bearing is a linear motion system produced at low cost, which is used for infinite stroke and cylindrical shaft. Since the bearing ball is in point contact with the shaft, the load is small. The steel ball rotates with very little frictional resistance, so that a smooth movement with high precision can be obtained.
Plastic linear bearings are a kind of self-lubricating linear motion system. The biggest difference from metal linear bearings is that metal linear bearings are rolling friction and point contact between the bearings and the cylindrical shaft, so this is suitable for low-load high-speed motion; and 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 and low speed movement.
We specialize in producing all kinds of bearings, providing more than 3000 different models, including various metric and inch deep groove ball bearings, self-aligning ball bearings, angular contact bearings, surface bearings, insert bearings. And we also provide open, sealing ring, dust cover structure.
According to the customer’s working conditions, we can design and manufacture non-standard bearings.
Bracket: nylon, polytetrafluoroethylene, polyetheretherketone, stainless steel skin, copper or crowded balls
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Post time: May-19-2020