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wallpapers Tech 2021-03-09
Bearings are an important part of contemporary machinery and equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy.
Industry Status
my country's bearing industry is developing rapidly, bearing varieties from small to large, product quality and technical level from low to high, industry scale from small to large, and a professional production system with basically complete product categories and a more reasonable production layout has been formed. At present, my country's bearing industry is facing three major problems: low concentration of industry production, low R&D and innovation capabilities, and low manufacturing technology.
Sliding bearings do not have inner and outer rings or rolling elements, and are generally made of wear-resistant materials. Commonly used for low speed, light load and lubrication
Bearing classification
Sliding bearing
Sliding bearings do not have inner and outer rings or rolling elements, and are generally made of wear-resistant materials. It is often used in low-speed, light-loaded, lubricated, and difficult-to-maintain mechanical rotating parts.
Joint bearing
The sliding contact surface of the joint bearing is a spherical surface, which is mainly suitable for swing motion, tilt motion and rotation motion.
Rolling bearing
Rolling bearings are divided into radial bearings and thrust bearings according to the load direction or nominal contact angle they can bear. According to the shape of the rolling elements, it can be divided into ball bearings and roller bearings. Roller bearings are divided into cylindrical roller bearings, needle roller bearings, tapered roller bearings and spherical roller bearings according to the types of rollers.
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 low friction coefficient, high limit speed, simple structure, low manufacturing cost, high precision, no need for frequent maintenance, large size range and many forms, and it is the most widely used type. Bearing.
Angular contact ball bearings
The six types of bearings represented by 36 and 46 type bearings are generally used to refer to them. The angular contact is generally 15 degrees, 25 degrees, 45 degrees, and so on.
Self-aligning ball bearing
A self-aligning ball bearing is a bearing equipped with spherical balls between the inner ring of two raceways and the outer ring whose raceways are spherical. Self-aligning ball bearings are suitable for bearing heavy loads and shock loads, precision instruments, low-noise motors, automobiles, motorcycles, metallurgy, rolling mills, mining, petroleum, papermaking, cement, sugar crushing and other industries and general machinery.
Thrust ball bearing
Thrust ball bearings are divided into one-way and two-way. They can only bear axial load and must not bear any radial load. Bidirectional thrust angular contact ball bearings
Double row tapered roller bearings
The contact angle of thrust angular contact ball bearings is generally 60°. Commonly used thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings, which are mainly used for precision machine tool spindles. They are generally used in conjunction with double-row cylindrical roller bearings and can withstand two-way shafts. To load, it has the advantages of high precision, good rigidity, low temperature rise, high speed, convenient assembly and disassembly, etc.
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, so the radial structure is compact. When the inner diameter and load capacity are the same as other types of bearings, the outer diameter is the smallest. It is especially suitable for supporting structures with restricted radial installation dimensions. 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.
Outer spherical ball bearing
The outer diameter surface of the outer ring of the outer spherical ball bearing is a spherical surface, which can play a role in centering.
Spherical roller bearing
Spherical roller bearings have two rows of symmetrical spherical rollers, which mainly bear radial loads, and can also bear axial loads in any direction, but cannot bear pure axial loads. This type of bearing has a large load capacity. In addition to the radial load, the bearing can also withstand bidirectional axial loads, and has good impact resistance. Generally speaking, the allowable working speed of spherical roller bearings is lower. . Suitable for working under heavy load or vibration load.
Flange bearing
Flange bearings are provided with flanged flanges on the outer wheel. The feature is that it can simplify the structure of the host, reduce the size of the host, and make the bearing easier to locate.
Bearing with seat
A component in which a radial bearing and a seat are combined. There is a base plate for mounting screws on a supporting surface parallel to the axis of the bearing.
Combined bearing
A rolling bearing composed of two or more bearing structures in a set of bearings at the same time. 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
Linear bearings are divided into metal linear bearings and plastic linear bearings.
Metal linear bearing is a linear motion system produced at low cost, used in conjunction with a cylindrical shaft with an infinite stroke. Since the bearing ball is in point contact with the shaft, the use load is small. The steel ball rotates with very little frictional resistance, so as to obtain high-precision smooth movement.
Plastic linear bearings are a kind of linear motion system with self-lubricating characteristics. The biggest difference from metal linear bearings is that metal linear bearings have rolling friction, and the bearing and cylindrical shaft are in point contact, so this is suitable for low-load and high-speed motion; Plastic linear bearings are sliding friction, and there is surface contact between the bearing and the cylindrical shaft, so this type is suitable for high-load, low-speed movement.

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Tag: Bearing