Industry news_Industry news_Yangzhou ROLLMAN Bearing Co., Ltd.

Linear Bearings

Linear bearings are divided into metal linear bearings and plastic linear bearings. Metal Linear Bushings are low-cost production linear motion systems for use with cylindrical shafts with infinite travel. Since the bearing ball is in point contact with the shaft, the operating load is small. The steel ball rotates with minimal frictional resistance, resulting in a smooth motion with high precision. The plastic linear bearing is a linear motion system with self-lubricating characteristics. The biggest difference between the metal linear bearing and the metal linear bearing is that the metal linear bearing is rolling friction, and the point contact between the bearing and the cylindrical shaft, so it is suitable for low-load high-speed motion; Plastic linear bearings are sliding friction, and there is surface contact between the bearing and the cylindrical shaft, so this is suitable for high-load, low-speed motion.

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Spherical roller bearing

 Time of issue:2022-05--26

Spherical roller bearings have two rows of symmetrical spherical rollers, which mainly bear radial loads, and can also bear axial loads in any direction, but cannot bear pure axial loads. The outer ring raceway of this type of bearing is spherical, so its self-aligning performance is good, and it can compensate for the coaxiality error. When the shaft is bent under force or installed non-concentrically, the bearing can still be used normally. The self-aligning performance varies with the bearing size series. , Generally, the allowable centering angle is 1~2.5 degrees. This type of bearing has a large load capacity. In addition to bearing radial load, the bearing can also bear axial load acting in both directions, and has good impact resistance. Generally, For spherical roller bearings, the allowable working speed is lower. Suitable for working under heavy or vibrating loads.

Needle Roller Bearings

 Time of issue:2022-05--26

Needle roller bearings are equipped with thin and long rollers (the length of the roller is 3~10 times the diameter, and the diameter is generally not more than 5mm), so the radial structure is compact, and its inner diameter and load capacity are the same as other types of bearings. The smallest diameter, especially suitable for supporting structures with limited radial installation size. Needle roller bearings can choose bearings without inner rings or needle roller and cage assemblies according to different applications. The surface of the hole is directly used as the inner and outer rolling surfaces of the bearing. In order to ensure the same load capacity and running performance as the bearing with rings, the hardness, machining accuracy and surface quality of the raceway surface of the shaft or housing hole should be the same as those of the bearing ring. Needle bearing is a bearing unit composed of radial needle roller bearing and thrust bearing components. It has a compact structure, small volume and high rotation accuracy. It can bear a certain axial load while bearing a high radial load. And the product structure is diverse, adaptable and easy to install. Combined needle roller bearings are widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other mechanical equipment, and can make the mechanical system design very compact and flexible.

Bearing material

 Time of issue:2022-05--26

Features of bearing steel: 1. Contact fatigue strength Under the action of periodic load, the contact surface of the bearing is prone to fatigue damage, that is, cracking and spalling, which is an important damage form of the bearing. Therefore, in order to improve the service life of the bearing, the bearing steel must have a high contact fatigue strength. 2. Wear resistance When the bearing is working, not only rolling friction but also sliding friction occurs between the ring, the rolling element and the cage, so that the bearing parts are constantly worn. In order to increase the wear of bearing parts, maintain the accuracy and stability of the bearing, and extend the service life, the bearing steel should have good wear resistance. 3. Hardness Hardness is one of the important qualities of bearing quality, and it has indirect effects on contact fatigue strength, wear resistance, and elastic limit. The hardness of bearing steel under operating conditions should reach HRC61~65, which can enable the bearing to achieve higher contact fatigue strength and wear resistance.

Lubrication method

 Time of issue:2022-05--26

Bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication. When lubricating, pay special attention to the amount, whether it is oil lubrication or grease lubrication, if the amount is too small, the lubrication will not fully affect the bearing life, and if the amount is too large, it will cause large resistance and affect the speed.

Bearing action

 Time of issue:2022-05--26

In terms of its function, it should be a support, that is, it is used to bear the shaft in a literal interpretation, but this is only a part of its function. The essence of support is to be able to bear radial loads. It can also be understood that it is used to fix the shaft. Bearing quick and easy automatic selection is included. It is to fix the shaft so that it can only rotate, and control its axial and radial movement. A motor would not work at all without bearings. Because the shaft may move in any direction, and the motor requires that the shaft can only rotate. In theory, it is impossible to achieve the function of transmission. Not only that, the bearing will also affect the transmission. In order to reduce this effect, good lubrication must be achieved on the bearings of the high-speed shaft. Some bearings have already been lubricated themselves, which are called pre-lubricated bearings. Most bearings must have lubricating oil, which is responsible for not only increasing energy consumption due to friction during high-speed operation, but also terrifyingly easily damaging the bearings. The argument to convert sliding friction into rolling friction is one-sided, because there is something called a sliding bearing. lubricating The purpose of lubricating rolling bearings is to reduce internal friction and wear of the bearing, prevent burning and sticking; prolong its service life; discharge friction heat, cooling, prevent bearing overheating, and prevent the aging of the lubricating oil; effect.