Are there axial bearings? Is it possible to slide on the shaft

Yes, we generally call it linear bearing, because it not only moves along the axis, but also rotates around the axis, so the design and application of two or more groups are generally used at the same time.

A linear bearing is a linear motion system used for linear travel in conjunction with a cylindrical shaft. Because the load-bearing ball is in contact with the bearing jacket point, the steel ball rolls with the minimum friction resistance, so the linear bearing has small friction and is relatively stable, does not change with the speed of the bearing, and can obtain smooth linear motion with high sensitivity and high precision. Linear bearing consumption also has its limitations, the most important is that the bearing impact load capacity is poor, and the load capacity is also poor, and secondly, the linear bearing vibration and noise are large when moving at high speed.

Linear bearings are included in the fast and easy automatic selection. Linear bearings are widely used in the sliding parts of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, and printing machinery.

Since the load-bearing ball is in contact with the bearing point, the load is small. The steel ball rotates with minimal frictional resistance, resulting in a smooth movement with high precision.

There are two kinds of axial bearings and radial bearings, axial bearings do sliding motion, and radial bearings do moving motion.

Axial bearings are those that can withstand axial forces with contact angles greater than 45 to 90 degrees. For example, a flat ball bearing, which has a contact angle of 90 degrees and the front and rear plates move in the same axial direction.

Radial bearings are those that can withstand radial forces with contact angles from 0 to 45 degrees. For example, ordinary deep groove ball bearings, the contact angle is 0, and the inner and outer sheets are moving on all surfaces.

Bearing is an important component in 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.

According to the different properties of the friction circle of moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, rolling bearings have been standardized and serialized, but compared with sliding bearings, its radial size, lack of panicle and noise are larger, and the highest is also higher.

Rolling bearings are generally composed of four parts: outer ring, inner ring, rolling element and cage. According to the shape of the rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.

Plain bearings are bearings that work under sliding friction. Plain bearings work smoothly, reliably and noiselessly. Under the condition of liquid lubrication, the sliding surface is separated by the lubricating oil without direct contact, which can also greatly reduce friction loss and surface wear, and the oil film also has a certain vibration absorption ability.

However, the starting friction resistance is large. The part of the shaft that is supported by the bearing is called the journal, and the part that matches the journal is called the bearing. The layer of anti-friction material cast on the inner surface of the bearing in order to improve the frictional properties of the bearing surface is called a bearing lining.

The material of the bearing pad and bearing lining is collectively referred to as the plain bearing material. Plain bearings are generally used in low-speed and heavy-load conditions, or in operating parts where maintenance and lubrication are difficult.

I don't like to copy online, so I will talk about it based on my experience in mechanical design.

Rolling bearings are made of multiple spheres or cylinders around the circumference to support and reduce friction, while plain bearings are made of oil film to achieve the above purposes.

It should be more obvious that rolling bearings are generally used in relatively small mechanical equipment, such as motors, gearboxes and so on! ～

And the sliding bearing has generally used large mechanical equipment, such as the propulsion shaft of the ship!

The rolling bearing has high running accuracy, some rolling bearings can bear radial load and axial load at the same time, the consumption of lubricating oil is less, the installation is convenient, the friction coefficient of the rolling bearing is smaller than that of the sliding bearing, the standardization, serialization and generalization have been realized, the use and maintenance are very convenient, and the most expensive non-ferrous metals used in the manufacture of sliding bearings can be saved; However, rolling bearings are particularly sensitive to foreign bodies such as metal chips, and the life of rolling bearings is shorter than that of plain bearings, and the ability of rolling bearings to bear loads is much smaller than that of plain bearings of the same volume, so the radial size of rolling bearings is large. Therefore, in the occasion of bearing large load and the occasion requiring small radial size and compact structure (such as internal combustion engine crankshaft bearing, rolling mill roll bearing), sliding bearings are mostly used; Rolling bearings have large vibration and noise, therefore, when the precision is required to be high and vibration is not allowed, the general rolling bearings are difficult to be competent, and sliding bearings are often selected.

The main difference is that rolling bearings have rolling elements (balls, cylindrical rollers, tapered rollers, needle rollers), while plain bearings do not have rolling elements.

The difference between rolling bearing and sliding bearing is first of all in the structure, the rolling bearing is to rely on the rotation of the rolling element to support the rotating shaft, so the contact part is a point, the more rolling elements, the more contact points nine;

The plain bearing supports the rotating shaft by a smooth surface, so the contact part is a face. Secondly, the mode of movement is different, and the mode of motion of rolling bearings is rolling;

The mode of movement of plain bearings is sliding, so the friction situation is completely different. Rolling bearings are generally used in relatively small mechanical equipment, places with high speeds, such as motors, gearboxes, etc., and sliding bearings are generally used under low-speed and heavy-load conditions, or in the operating parts where maintenance and lubricating oil are difficult.

Introduction: Bearing is an important part of many mechanical equipment, which is gradually standardized in the market, and its size and specifications are related to the regulations. Moreover, it can be divided into rolling bearings and plain bearings according to the different friction properties of moving elements.

So, how to distinguish between rolling bearings and plain bearings? What's different? If you are interested, you can follow along to find out in this article.

Many mechanical equipment have large and small, various bearings, and the main role of the bearing is not only fixed, but also to reduce friction during mechanical operation and ensure its accuracy. What is the difference between rolling bearings and plain bearings as two types of bearings? To this end, from their definition, advantages and disadvantages, structure and other aspects to teach everyone to distinguish rolling bearings and plain bearings.

Difference Between Rolling Bearings and Plain Bearings – Definition, Advantages and Disadvantages

Rolling bearing refers to the friction between the shaft of mechanical operation and the block circle of the shaft seat is the bearing of rolling friction, but the sliding bearing still works under sliding friction. The rolling bearing structure is well-defined and the evenly distributed rolling elements can effectively reduce friction, so the mechanical start is very fast and good, and the maintenance is relatively simple and convenient. In addition, it is more suitable for working at medium speeds, which are noisy and reduce their service life.

In addition, rolling bearings vibrate heavily when operating. In contrast, plain bearings run smoothly and noiselessly, but the resistance is relatively high when starting.

The difference between rolling bearings and plain bearings - structure

The rolling bearing is composed of an inner ring, an outer ring, a rolling element and a cage, wherein the outer ring is fixed as a support; The inner ring rotates with the shaft; The rolling element is the most important, which is related to the performance and service life of the bearing; The cage is to assist the rolling elements in their work, so that they are evenly distributed. Plain bearings do not have the above structure, and the key role in this is the material used to make the plain bearing.

In addition, the main function of the bearing is to reduce friction, in which the friction of the rolling bearing is related to the level of its manufacturing process, that is, whether it is accurate. However, the friction of the sliding bearing is related to the material from which it is made, and in general, there are two types of metal sliding bearings and non-metallic sliding bearings (mostly plastic).

Although rolling bearings and plain bearings are both mechanical parts, their operation is not the same. In addition, in the process of using machinery, it is also necessary to pay attention to the daily maintenance and repair of rolling bearings and sliding bearings. If you want to study in depth, it is recommended that you observe these two types of bearings in person.

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