Home > sealed-bearings

Sealed Bearings



Related

"Sealed Bearings"

Blog
Types of turbo-charged bearing
Turbo-charger bearing.Its structure is related to the reliability and durability of turbine work. Turbocharger bearings are mainly divided into two categories, one is floating bearings (commonly known as Bosi bearings), and the other is ball bearings.Most major auto manufacturers now use floating bearings, which should be durable and affordable. Th... Turbo-charger bearing.Its structure is related to the reliability and durability of turbine work. Turbocharger bearings are mainly divided into two categories, one is floating bearings (commonly known as Bosi bearings), and the other is ball bearings.Most major auto manufacturers now use floating bearings, which should be durable and affordable. The floating bearing is actually a ring that is sleeved on the shaft. There is a gap between the ring and the shaft and the ring and the bearing seat to form a double oil film. The ring floats between the shaft and the bearing seat. Generally, the inner layer gap is about 0.05mm, and the outer layer gap is about 0.1mm. The bearing wall thickness is about 3.0-4.5mm, made of tin-lead bronze alloy, the bearing surface is coated with a layer of lead-tin alloy or metal indium with a thickness of about 0.005-0.008mm. When the supercharger is working, the bearing rotates between the shaft and the bearing seat. Therefore, we can find the shortcomings of floating bearings: the high-speed running resistance of the turbine shaft is high, the oil pressure and quality requirements are high, and the dynamic control of the turbine shaft is unstable. View Details
What are the characteristics of ball screw support bearings
Features of ball screw support: (1) The adoption of the best bearing du takes into account the balance in rigidity with the ball screw, so that dao uses high-rigidity and low-torque angular contact ball bearings (contact angle 30°, free combination). At the same time, the ultra-small support units EK6, 8 are equipped with ultra-small angular ... Features of ball screw support: (1) The adoption of the best bearing du takes into account the balance in rigidity with the ball screw, so that dao uses high-rigidity and low-torque angular contact ball bearings (contact angle 30°, free combination). At the same time, the ultra-small support units EK6, 8 are equipped with ultra-small angular contact ball bearings developed for ultra-small ball screws. This bearing has a contact angle of 45°, a small ball diameter and a large number of balls. It is an ultra-small angular contact ball bearing with high rigidity and high precision, which can obtain stable slewing performance. (2) The shape of the support unit The support unit has angular and round series, which can be selected according to the application. (3) Small size and easy installation The support unit is a small-volume design that takes into consideration the space around the installation. At the same time, the bearings with adjusted preload are installed, and they can be directly assembled after delivery, which not only reduces the assembly man-hours, but also improves the assembly accuracy. View Details
The factors need to be considered for bearing seals
Bearings are a kind of commonly used mechanical hardware products. Good bearings need to have excellent sealing performance during use. At present, the seals of bearings can be divided into two types: self-contained sealing and external sealing. Generally, the self-contained sealing is relatively simple and the cost is also relatively low; and the ... Bearings are a kind of commonly used mechanical hardware products. Good bearings need to have excellent sealing performance during use. At present, the seals of bearings can be divided into two types: self-contained sealing and external sealing. Generally, the self-contained sealing is relatively simple and the cost is also relatively low; and the external sealing performance device is a sealing device with various properties inside the end cap. Some factors need to be considered in the sealing process to ensure that the sealing performance is better. The factors that need to be considered for bearing external sealing are: 1. Bearing lubricant (grease and lubricating oil); 2. The working environment of the bearing and the size of the occupied space; 3. Advantages of the support structure of the shaft, allowing angular deviation; 4. The circumferential speed of the sealing surface; 5. The working temperature of the bearing; 6. Manufacturing costs. According to the working conditions of the bearing and the requirements of the working environment for sealing degree, we often use various sealing forms in engineering design to achieve a better sealing effect. View Details
Configuration type of common rolling mill bearings
(1) Spherical roller bearings. The configuration of the early rolling mill bearings on the rolling mill is different from the present. At that time, two sets of spherical roller bearings were mainly installed side by side on the same roller neck. This configuration basically meets the production conditions at that time, and the rolling speed can r... (1) Spherical roller bearings. The configuration of the early rolling mill bearings on the rolling mill is different from the present. At that time, two sets of spherical roller bearings were mainly installed side by side on the same roller neck. This configuration basically meets the production conditions at that time, and the rolling speed can reach 600 rpm. (2) Four-row cylindrical roller bearing + thrust bearing. The inner diameter of the cylindrical roller bearing is tightly matched with the roll neck, and it can bear radial force. The cylindrical roller bearing has advantages of large load capacity, high limit speed, high precision, easy processing, low production cost, convenient installation and disassembly and the inner and outer rings can be separated. The thrust bearing bears axial force, and the specific structure type can be selected according to the characteristics of the rolling mill. While for heavy-duty low-speed, we can equip with thrust roller bearings to withstand the thrust load with a small axial clearance. When the rolling speed is high, it is equipped with angular contact ball bearings so that speed limit is high and the axial clearance can be controlled. This type of bearing configuration not only has long bearing life, high reliability, but also has many advantages such as high precision and easy control of rolling products. Therefore, it is widely used in wire rod mills, sheet mills, foil mills, and support rolls for cold rolling mills and hot rolling mills. (3). Four-row tapered roller bearings. The tapered roller bearings can withstand both radial and axial forces, and no need to configure thrust bearings. The inner diameter of the tapered roller bearing is loosely matched with the roll neck. It is very convenient to install and disassemble, but sometimes it will cause sliding creep due to the loose fit. Therefore, the inner diameter is often processed with a spiral oil groove. This type of configuration is widely used in the working roll of four-roll hot rolling mill and a cold rolling mill, and roll for blanking machine, steel beam rolling mill. View Details
Factors affecting the performance of ZYS Spindle
Heating of spindle is the factor which effects the operation precision of ZYS spindle. The internal heat source of the spindle comes from two aspects: 1. the heating of the spindle bearing; 2. the heating of the motor in the spindle. Solving the motor heating problem needs the cooling motor stator, which can be realized by circulating water cool... Heating of spindle is the factor which effects the operation precision of ZYS spindle. The internal heat source of the spindle comes from two aspects: 1. the heating of the spindle bearing; 2. the heating of the motor in the spindle. Solving the motor heating problem needs the cooling motor stator, which can be realized by circulating water cooling method to take away the heat of the motor; to solve the heating problem of the spindle bearing, it is necessary to take away the heat generated from the operation of the bearing in time. Traditional thin oil lubrication is to transport a large amount of lubricating oil and then achieve invasive lubrication; at the same time, lubricating oil will take the heat away. There are disadvantages of this lubrication way. One is the waste of a large amount of lubricating oil; the other is that the lubricating oil produces a large amount of circulating heat by friction between the molecules of the lubricating oil and the pipeline during the cycle, which causes the oil temperature to rise. The lubricating oil can not only not play a good cooling effect, but also lead to the increase of bearing temperature, which is not conducive to the performance of spindle bearings. Therefore, eliminating the friction heat between molecules in liquid is the key to solve the problem. Practice shows that oil-gas lubrication can fundamentally avoid the occurrence of this situation. First, oil-gas lubrication provides a small amount of lubricating oil to meet the requirements of the bearing. Secondly, oil-gas lubrication does not produce heat from molecular friction of lubricating oil, while clean compressed air takes away the heat produced by bearings and keeps the spindle running at a stable temperature. This can effectively solve the problem of thermal deformation caused by the rise of temperature. View Details
Daily maintenance of bearings
Bearings are an important part of machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Maintenance work is the top priority for bearings to work properly, maintain performance, and extend life. Everyone should take it seriously. Next, let's... Bearings are an important part of machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Maintenance work is the top priority for bearings to work properly, maintain performance, and extend life. Everyone should take it seriously. Next, let's take a closer look at the daily maintenance work of the bearings. First, keep the bearings lubricated and clean Before inspecting the bearing, clean the surface of the bearing first and then remove the parts around the bearing. Pay special attention to the oil seal, which is a very fragile part. Please be careful when inspecting and disassembling the bearing to avoid damage to the part. If you have been experiencing bad symptoms when inspecting the oil seal of bearing and its surrounding parts, be sure to replace it to avoid damage to the bearing caused by a bad oil seal. Second, to ensure the quality of bearing lubricants The quality of the lubricant has a direct impact on bearing service life. The inspection method for the bearing lubricant is as follows: the lubricant is rubbed between the two fingers, and if there is a contaminant, it can be felt; or a thin layer of lubricant is applied on the back of the hand, and then the sealing is checked. Then it is to replace the lubricant of the bearing. Third, the working environment of the bearing When inspecting bearings, never expose them to contaminants or moisture. If the work is interrupted, cover the machine with a piece of oil-paper plastic or similar material. The working environment of the bearing is also very important. Fourth, the bearing seal The purpose of bearing sealing is to prevent dust, moisture and impurities from entering the bearing, but also to prevent the loss of lubricant. A good seal ensures that the machine works properly, reduces noise and extends the life of the parts. ​The above is the relevant introduction of the daily maintenance work of the bearing. It is mainly explained from four aspects. In fact, these four aspects are also related to each other. Therefore, bearing maintenance work is carried out closely around the four words of clean, lubrication, sealing and environment. View Details