Types of Bearings-Buying Guide
Bearings are an important part of our lives. Bearings are the basic element of any rotating mechanism. You can observe that bearings are any simple mechanism, for example, the fan in your house, the mixture in your kitchen, the bearings inside your bicycle. Bearings are used in a wide range of applications, and therefore there are many different types of bearings as well as uses for them.
Classification of bearings.
Bearings are divided into two categories: rolling bearings and sliding bearings according to the different frictional properties of the moving parts.
Bearings are divided into: radial bearings and thrust bearings according to the bearing direction or nominal contact angle.
According to the type of rolling body: ball bearings, roller bearings.
Divided into: Spherical bearings, non-spherical bearings (rigid bearings) according to the ability to align
According to the number of rolling body is divided into: single row bearing, double row bearing, multi-row bearing
According to whether the parts can be separated into: separable bearings, non-separable bearings.
Understand the different types of bearings and their uses.
1、Sliding bearing
Sliding bearing is not divided into inner and outer ring and no rolling body, generally made of wear-resistant materials. Commonly used in low speed, light load and filling lubricating oil and maintenance of difficult mechanical rotation parts.
2、Joint bearing
The sliding contact surface of the joint bearing is spherical, mainly used for oscillating motion, tilting motion and rotating motion.
3、Rolling bearing
Rolling bearing is a precision mechanical component that changes the sliding friction between the running shaft and the shaft seat into rolling friction, thus reducing the friction loss. Rolling bearing is generally composed of inner ring, outer ring, rolling body and cage four parts, the role of the inner ring is to match the shaft and rotate with the shaft; outer ring role is to match with the bearing seat, play a supporting role; support the rotation of the shaft and shaft parts, and maintain the normal working position of the shaft and rotational accuracy
4、Deep groove ball bearings
Deep groove ball bearing is the most representative rolling bearing. Compared with other types of bearings of the same size, this type of bearing has small friction coefficient, high limit speed, simple structure, low manufacturing cost, high precision, no need for frequent maintenance, and a large range of sizes and forms, is the most widely used type of bearing. It mainly bears radial load, but also can bear certain axial load. When it only bears the radial load, the contact angle is zero. Deep groove ball bearings can be used in gearboxes, instruments, motors, household appliances, internal combustion engines, traffic vehicles, agricultural machinery, construction machinery, engineering machinery, roller skates, yo-yo ball, etc.
5、Spherical ball bearing
Spherical ball bearing is two raceways of the inner ring and the raceway for the spherical outer ring between, assembled with a spherical ball bearings. The center of curvature of the outer raceway surface is the same as the center of the bearing, so it has the same self-aligning function as the self-aligning ball bearing. When the shaft or housing is deflected, it can be adjusted automatically without increasing the burden on the bearing. Spherical ball bearing is suitable for bearing heavy load and impact load, precision instrumentation, low noise motor, automobile, motorcycle, metallurgy, rolling mill, mining, petroleum, paper, cement, sugar and other industries and general machinery, etc.
6、Thrust ball bearing
Thrust ball bearings are divided into one-way and two-way. They can only bear axial load, can never bear any radial load. Thrust bearing is divided into two parts: tight ring and live ring. Tight circle and shaft sleeve tight, live ring support in the bearing seat. Ring and rolling body usually use high strength, good wear resistance of rolling bearing steel manufacturing. Cage more with soft steel stamping made, can also use copper alloy sandwich cloth rubber wood or plastic and other manufacturing. The most common in life is between the bicycle fork and the frame, the use of thrust ball bearings, so that cyclists turn the handle to save effort. This type of bearing is used between the shaft and the seat need to withstand the larger axial force of the place.
7、Two-way thrust angular contact ball bearing
Thrust angular contact ball bearing contact angle is generally 60 ° commonly used thrust angular contact ball bearing is generally two-way thrust angular contact ball bearing, mainly used for precision machine tool spindle, generally used with double row cylindrical roller bearing together, can bear two-way axial load, with high precision, good rigidity, low temperature rise, high speed, easy to install and disassemble and other advantages.
8、Needle roller bearings
Needle roller bearings are equipped with thin and long rollers (roller length of 3-10 times the diameter, the diameter is generally not more than 5mm), so the radial structure is compact, its inner diameter size and load capacity with other types of bearings, the outer diameter of the smallest, especially suitable for radial installation size is restricted support structure. Needle roller bearings are widely adaptable and easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other machinery and equipment, and can make the mechanical system design is very compact and dexterous.
11、Spherical roller bearings
Spherical roller bearings have two rows of symmetrical spherical roller, mainly bear radial load, but also can withstand either direction of the axial load, but can not bear pure axial load. The bearing outer ring raceway is spherical, so its spherical performance is good, can compensate for coaxiality error, when the shaft is bent or installed different heart bearing can still normal use, spherical with bearing size series and different. Suitable for heavy load or vibration load work.
12、Flange bearing
Flange bearing with flange flange on the outer wheel. Features can simplify the host structure, reduce the size of the host, so that the bearing is easier to position.
13、Bearing with seat
To the heart of the bearing and seat combined together in a component, in parallel with the bearing axis line of support surface has a mounting screws on the bottom plate.
14、Combination bearing
A set of bearings at the same time by the above two bearing structure form combination of rolling bearings. Such as needle roller and thrust cylindrical roller combination bearings, needle roller and thrust ball combination bearings, needle roller and angular contact ball combination bearings, etc.
15、Linear bearings
Linear bearings are divided into metal linear bearings and plastic linear bearings. Metal linear bearings are a kind of linear motion system produced at low cost, used for infinite stroke with cylindrical shaft. As the bearing ball and shaft is point contact, so the use of small load. The steel balls rotate with very little frictional resistance, thus allowing for high precision and smooth motion.
Plastic linear bearing is a self-lubricating characteristics of linear motion system, the biggest difference between the metal linear bearing is the metal linear bearing is rolling friction, bearing and cylindrical shaft is point contact, so this suitable for low load high-speed movement; and plastic linear bearing is sliding friction, bearing and cylindrical shaft is surface contact, so this suitable for high load in low-speed movement.
