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What are the classifications of bearings?

wallpapers Tech 2020-10-28
Bearings are the most common mechanic components used in our daily life. There are bearings in almost rotating places, such as fans, motors, and transportation vehicles. So what are the classifications of bearings? The following editor will introduce some bearings for you, hoping to help you better understand and apply bearings!
 
Usually, bearings are divided into sliding bearings, joint bearings and rolling bearings according to the friction method.
 
Sliding bearings have no inner and outer rings or rolling elements, and are generally made of wear-resistant materials. It is often used in low-speed, light-loaded and lubricated mechanical rotating parts that are difficult to maintain.
 
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 bearings are generally composed of four parts: inner ring, outer ring, rolling element and cage. The function of the inner ring is to cooperate with the shaft and rotate with the shaft; the function of the outer ring is to cooperate with the bearing seat and play a supporting role;
 
Rolling bearings are divided into 10 categories:
 
Deep Groove Ball Bearing
Deep groove ball bearings are a relatively common type of rolling bearings. The single row deep groove ball bearing type code is 6, and the double row deep groove ball bearing type code is 4. The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of cages. There are two types of deep groove ball bearings, single row and double row. The deep groove ball structure is divided into two types: sealed and open. The open type means that the bearing does not have a sealed structure. The sealed deep groove ball is divided into dust-proof and oil-proof. seal. The material of the dust-proof seal cover is stamped from steel plate, which simply prevents dust from entering the bearing raceway. The oil-proof type is a contact oil seal, which can effectively prevent the grease in the bearing from overflowing. As shown:
 
1- 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. 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 or housing is deflected, it can be adjusted automatically without increasing the bearing burden. Spherical roller bearings can bear radial load and axial load in two directions. Large radial load capacity, suitable for heavy load and shock load. Bearings whose inner diameter is a tapered bore can be directly installed. Or use an adapter sleeve or a disassembly tube to install it on the cylindrical shaft. The cage uses steel stamping cage, polyamide forming cage and copper alloy car cage. As shown:
 
2-cylindrical roller bearing
Cylindrical rollers and raceways are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the retaining edge of the ring is small, which is suitable for high-speed rotation. According to whether the ring has ribs, it can be divided into single row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double row cylindrical roller bearings such as NNU and NN. The bearing has a separable structure with inner ring and outer ring. As shown:
 
3-Spherical roller bearing
Spherical roller bearings have two rows of rollers, which mainly bear radial load, but can also bear axial load in any direction. With high radial load capacity, it is especially suitable for working under heavy load or vibration load, but it cannot bear pure axial load. The outer ring raceway of this type of bearing is spherical, so its alignment performance is good, and it can compensate the coaxiality error. As shown:
 
4- Spiral roller bearings
The rolling system of spiral roller bearings uses spiral rollers wound with steel belts. Therefore, it is called a spiral roller bearing. This type of bearing has large elasticity and radial clearance, can withstand large impact radial load, cannot withstand axial load, and has a low limit speed. It is only suitable for parts with low rotation accuracy and often large impact loads. When the bearing is installed, an inclination of 0.5° between the axis of the inner ring and the axis of the outer ring is allowed. Due to the elastic deformation of this type of bearing, the accuracy cannot be guaranteed during work, so the accuracy of the spiral roller bearing is only one of the ordinary level, and there is no other precision level.
 
5-Angular contact ball bearing
Angular contact ball bearings have raceways on the inner and outer rings, and the inner and outer rings can be relatively displaced along the bearing axis. This type of bearing is particularly suitable for bearing compound loads, that is, loads acting both radially and axially. The axial load bearing capacity of angular contact ball bearings increases with the contact angle α. The contact angle is the angle between the line of contact points between the ball and the raceway in the radial plane and the vertical line of the bearing axis. As shown:
 
6-Tapered Roller Bearing
The ability of single-row tapered roller bearings to bear axial load depends on the contact angle, that is, the outer ring raceway angle. The greater the angle, the greater the axial load capacity. The most used tapered roller bearings are single row tapered roller bearings. In the front wheel hub of the car, a small-sized double-row tapered roller bearing is used. Four-row tapered roller bearings are used in heavy machines such as large cold and hot rolling mills. As shown:
 
7-thrust ball bearing
Thrust ball bearings are designed to withstand thrust loads at high speeds, and are composed of washer-shaped ferrules with ball rolling grooves. Because the ring is in the shape of a cushion, thrust ball bearings are divided into two types: flat base cushion type and self-aligning spherical cushion type. In addition, this kind of bearing can bear axial load, but cannot bear radial load.
 
8-Thrust Roller Bearing
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

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