The principle of the rolling mill bearing, the working principle of the bearing

1. The working principle of the bearing is to replace sliding friction with rolling friction;

2. Due to the different working conditions of various machinery, various requirements are put forward for the rolling bearing in terms of load capacity, structure and performance and other aspects, therefore, the rolling bearing needs to have a variety of structures; Wang Wheel.

3. The bearing is usually molded to be evenly arranged between the two rings with the help of the cage for rolling motion, its shape, size and number directly affect the bearing load capacity and performance, the cage can not only evenly separate the rolling elements, but also play a role in guiding the rolling elements to rotate and improve the internal lubrication performance of the bearing.

1. The working principle of the bearing is to replace sliding friction with rolling friction;

2. Because all kinds of machinery have different working conditions, various requirements are put forward for rolling bearings in terms of load capacity, structure and use performance, therefore, rolling bearings need to have a variety of knot pin structures;

3, the bearing is usually evenly arranged between the two rings with the help of the cage for the rolling movement of the chain, its shape, size and number directly affect the bearing load capacity and performance, the cage can not only evenly separate the rolling elements, but also play a role in guiding the rotation of the rolling elements and improving the lubrication performance of the bearing.

The bearing has a relatively simple construction: a ball with a smooth metal surface inside and outside that facilitates rolling. The weight of the load carried by the ball itself - the force of the load weight is the force that drives the bearing to rotate.

However, not all loads exert force on the bearing in the same way. There are two different loads: radial and thrust.

Radial loads, such as in pulleys, simply place weight on the bearing, causing the bearing to roll or rotate due to tension. The thrust loads are significantly different and exert stress on the bearings in a completely different way.

If the bearing (think of the tire) flips on its side (now think of the tire swing) and is subjected to a full force at that angle (think of three children sitting on the tire swing), this is called a thrust load. The bearings used to support the stool are examples of bearings that only bear thrust loads.

Many bearings are susceptible to radial and axial loads. For example, car tires are subjected to radial loads when traveling in a straight line: tires roll forward in a rotational manner due to tension and the weight they support.

According to the working principle of the bearing, the <> can be divided into: rolling friction bearing (rolling bearing) and sliding friction bearing (plain bearing). Plain bearings:

If a lubricating film can be formed on the surface of the sliding shaft with the ballast bearing to separate the surface of the moving pair, the sliding friction can be greatly reduced, and the wear is also avoided because the surface of the moving pair is not in direct contact. The sliding bearing has a large bearing capacity, high rotation accuracy, and a lubricating film with impact resistance, so it has been widely used in engineering. The formation of lubricating film is the basic condition for the normal operation of sliding bearings, and the factors affecting the formation of lubricating film include lubrication mode, relative movement speed of the moving pair, physical properties of the lubricant and roughness of the surface of the moving pair.

The design of the sliding bearing should determine the structural type of the bearing, the selection of lubricant and lubrication method and the geometric parameters of the bearing according to the working conditions of the bearing Sliding bearing, a bearing that works 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 travel 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 a bearing is called a journal, and the part that matches the journal is called a 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. Commonly used sliding bearing materials include bearing alloy (also known as babbitt or white alloy), wear-resistant cast iron, copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite, polytetrafluoroethylene (PTFE), modified polyoxymethylene (POM), etc. Plain bearings are generally used in low-speed and heavy-load conditions, or in operating parts where maintenance and lubrication are difficult.

1. The working principle of the bearing is to replace sliding friction with rolling friction;

2. Due to the different working conditions of various machinery, various requirements are put forward for rolling bearings in terms of load capacity, structure and performance and performance, therefore, rolling bearings need to have various structures;

3. The bearing is usually evenly arranged between the two rings with the help of the cage for rolling motion, its shape, size and number directly affect the load capacity and performance of the bearing, the cage can not only evenly separate the rolling elements, but also play a role in guiding the rotation of the rolling elements and improving the internal lubrication performance of the bearing.

100 seconds to understand the structure and principle of one-way bearing, it turns out that it is so simple.

A bearing is a mechanical element that restricts relative motion to the desired range of motion and reduces friction between moving parts. The design of the bearing can provide free linear motion of the moving part or free rotation around a fixed axis, or it can prevent movement by controlling the vector of normal forces acting on the moving part. Most bearings facilitate the desired movement by minimizing friction.

Bearings can be broadly classified according to different methods such as the type of operation, the permissible movement, or the direction of the load (force) applied to the part.

Rotating bearings support rotating parts such as rods or shafts within a mechanical system and transfer axial and radial loads from the load source to the structure that supports it. The simplest bearing is a plain bearing, which consists of a shaft that rotates in a bore. Friction is reduced through lubrication.

In ball bearings and roller bearings, in order to reduce sliding friction, rolling elements of rollers or balls with a circular cross-section are placed between the housing rings or journals of the bearing assembly. A wide variety of bearing designs can be correctly adapted to meet the needs of different applications for maximum efficiency, reliability and durability.

The word bearing is derived from the verb "to bear",[1] and a bearing is a machine element that allows one part to support (i.e., support) another. The simplest bearing is the bearing surface, which is cut or shaped into a part with varying degrees of control over the shape, size, roughness and position of the surface. Other bearings are self-contained devices that are mounted on a machine or machine part.

In the most demanding equipment, precision bearings need to be manufactured to meet the highest standards of current technology.

The invention of rolling bearings in the form of wooden rollers is very old and can be found before the invention of the wheel.

Although there are claims that the Egyptians used roller bearings in the form of tree trunks under sleighs,[2] this is only modern speculation. [3] The paintings found at the tomb of Djehutihotep[4] depict Egyptians using sleds to move huge stones in a liquid-lubricated slide that constitutes a sliding bearing. Also found were drawings of hand-drilled bearings.

5] The earliest rolling bearing discovered was a wooden ball bearing that supported a rotating table on the wreck of the ship Romanemi in Lake Nemi, Italy. The shipwreck dates back to 40 BC. [6][7]

Leonardo da Vinci's *** design from around 1500 included drawings of ball bearings. This is the first time bearings have been used in aerospace design. However, Agostino Ramelli was the first to publish sketches of roller and thrust bearings.

2] One problem with ball bearings and roller bearings is that the friction of balls or rollers against each other can cause additional friction, which can be reduced by encapsulating the balls or rollers within a cage. Captured or cage-like ball bearings were first proposed by Galileo in the 17th century.

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