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How to choose the type of bearing

There are also relevant introductions on how to choose the brand and type of bearings, but some common sense about bearings that are more biased, or are often ignored or ignored, often play a very important role in the use of bearings. Learn about it.
 
1. What is the life of the bearing?
 
For a single bearing, the number of revolutions of one ring relative to the other before fatigue expansion of one ring or rolling element material first occurs is called the bearing life. Due to differences in manufacturing accuracy, material homogeneity, etc., even bearings of the same material, same size and produced in the same batch work under exactly the same conditions, their lifespans will be very different.
 
2. What are the main failure modes of rolling bearings?
 
The main ones are: pitting corrosion, plastic deformation, abrasive wear, adhesive wear, rust, bearing burn, etc.
 
3. What is the basic rating life of the bearing?
 
According to the number of revolutions (in millions of revolutions) or the number of working hours before pitting damage occurs in 10% of the bearings in a set of bearings, and 90% of the bearings do not suffer from pitting damage, the life of the bearing is taken as the life of the bearing. It is called the basic rating life, and it is expressed as L10.
 
4. What is the basic dynamic load rating of the bearing?
 
When the basic rated life of the bearing is exactly one million revolutions, the load value that the bearing can bear is called the basic dynamic load rating of the bearing, which is represented by C. For radial bearings, it refers to pure radial load, which is represented by Cr; for thrust bearings, it refers to pure axial load, which is represented by Ca.
 
5. What is the equivalent dynamic load of the bearing?
 
If the rolling bearing bears radial and axial combined loads at the same time, in order to compare the bearing life under the same conditions, the actual load must be converted into an equivalent dynamic load consistent with the load conditions for determining the basic dynamic load rating when calculating the life of the bearing. , denoted by P.
 
6. Why should the static load be calculated for rolling bearings?
 
Static load refers to the load acting on the bearing when the relative speed of the bearing ring is zero or the relative speed is extremely low. In order to limit the excessive contact stress and permanent deformation of rolling bearings under static load, static load calculation is required.

Related News

Installation method of Deep Groove Ball Bearing

Installation method I of Deep Groove Ball Bearing: press fit: the inner ring of the bearing is tightly matched with the shaft. When the outer ring is loosely matched with the bearing seat hole, press the bearing onto the shaft with a press machine, and then install the shaft and the bearing into the bearing seat hole together. When pressing, pad an assembly sleeve made of soft metal material (copper or soft steel) on the end face of the bearing inner ring. The outer ring of the bearing is tightly matched with the bearing seat hole. When the inner ring is loosely matched with the shaft, The bearing can be pressed into the bearing seat hole first, and the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly matched with the shaft and seat hole, the installation of the inner and outer rings should simultaneously press into the shaft and seat hole. The structure of the assembly sleeve should be able to simultaneously press the end faces of the bearing inner and outer rings.

How to choose the type of bearing

There are also relevant introductions on how to choose the brand and type of bearings, but some common sense about bearings that are more biased, or are often ignored or ignored, often play a very important role in the use of bearings. Learn about it.

Features of spherical plain bearings

The structure of the spherical plain bearing is simpler than that of the rolling bearing, which is mainly composed of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface. Joint bearings are generally used for low-speed swinging motion (ie angular motion). Since the sliding surface is spherical, it can also perform tilting motion (ie self-aligning motion) within a certain angle range. When the degree is large, it can still work normally.

Explanation of self-aligning ball bearings

The bearing is equipped with spherical balls between the inner ring of the two raceways and the outer ring of the spherical surface of the raceway. The outer diameter of the self-aligning functional bearing and the inner diameter of the bearing seat are spherical cooperation, and there is an active self-aligning function between the two, which can compensate for the misalignment of the axes caused by the device error and the deformation of the bottom surface of the device. The material of the cage is steel plate, synthetic resin, etc.

Precautions for the use of deep groove ball bearings

For deep groove ball bearings, the bearing load is too small during operation, which will cause sliding between the ball and the raceway, which will become the cause of scratches. This is especially true for large deep groove ball bearings with heavy ball and cage weights. In many cases, bearings will corrode. There are many reasons for bearing corrosion. The most common factors in our daily life are the following:

How deep groove ball bearings work

Deep groove ball bearings mainly bear radial load, and can also bear radial load and axial load at the same time. When it is only subjected to radial load, the contact angle is zero. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can bear a large axial load. The friction coefficient of the deep groove ball bearing is very small, and the limit speed is also high.