T-Blog, Your Bearing Wikipedia

The type of machinery is different, the service conditions of the bearings will be different, and the performance requirements are also different. Generally speaking, there are more than two bearings that would be used on a shaft. In order to facilitate axial positioning, most of the bearings are used as fixed-end bearings, and the rest are used as floating-end bearings. The following table lists the choice of fixed end and floating end bearing structure.

Bearing Selection Guide The types, structures, and sizes of rolling bearings are diverse. In order to make the mechanical device play the expected performance, it is very important to choose the most suitable bearing. To select a bearing, many factors need to be analyzed. The general sequence is as follows: (1) Understand the operating conditions of mechanical devices and bearings, etc. (2) Clear requirements for bearings (3) Select the type of bearing (4) Select the bearing configuration (5) Select bearing size (6) Select bearing specifications (7) Installation method of selected bearing The location of the bearing, the operating conditions, and the environmental conditions are the prerequisites for choosing a suitable bearing. For this, it is necessary to obtain the following data and information: (1) Function and structure of the mechanical device (2) Where to use the bearing (3) Bearing load (size, direction) (4) Rotation speed (5) Vibration and shock (6) Bearing temperature (ambient temperature, temperature rise) (7) Ambient atmosphere (corrosive, clean, lubricating) How to select the bearing type for your machine? When selecting a bearing type, it is important to fully understand the operating conditions of the bearing. The following table lists the main analysis items:

Have you ever noticed the types of cage guidance of your bearings?  Basically, there are 3 types: outer-ring-rib guidance, inner-ring-rib guidance, and rolling-element guidance. Unfortunately, big part of Chinese factories, including big brands, don’t put their eyes on cage guidance.  They believe various types of cage guidance are interchangeable. You may get NU2310 with MA brass cage with outer-ring-rib guidance, even though you order “NU2310M” with clear requirement of rolling-element guidance.  In some cases, it may lead to a serious claim. All these 3 types of cage guidance probably appear in various types of bearings, with performance reasons, bearing design reasons and manufacturing reasons. Attention should be paid to the different performances of different types of cage guidance.  The performance difference of these 3 types of cage guidance is mainly reflected in the speed performance under different lubrication conditions. During our research on cage guidance, we got to know something interesting as extra: 1.     Brass cage is widely used in high-speed application. 2.     There are 4 kinds of gaps between components:  radial clearance (Gr), roller gap (△), cage guidance gap (Cr), cage axial gap (Ca), respectively.  These gaps are defined as the maximum possible displacements between relative components in radial/axial…

Full complement cylindrical roller bearings are capable of carrying higher radial loads than bearings that utilize a cage and roller design.

There are many types of bearing materials, among which stainless steel is probably one of the most commonly used bearing materials. Compared with ordinary bearing steel (Chrome steel GCr15/100 Cr6/SUJ2), stainless steel bearing not only have obvious advantages in material, but also much strict in process and precision control than ordinary bearing. It is more stable, has low noise and stronger anti-rust and anti-corrosion properties, it can be used in the condition of -60℃-+300℃with proper lubricant and shields 1.     Excellent corrosion resistance: with strong corrosion resistance, stainless steel bearing is not easy to rust. And it will not react easily with water or liquid, can be washed with water. 2.     Compared with steel material, stainless steel bearing is clean and has longer operating life. 3.     High heat resistance can be operated in high temperature range from 180-1000 °F, therefore it can be adapted to all kinds of weather conditions, even if it’s very hot, we can cool it down with water. Stainless Steel Bearing includes SS440 Stainless Steel Bearing (Generally inner/outer ring/balls and rollers is SS440, cage is SS304): It is a kind of high-strength cutting tool steel with slightly higher carbon content. It can obtain higher yield strength after…

Full ceramic bearings have the characteristics of magnetoelectric insulation, wear resistance, corrosion resistance, oil-free self-lubrication, high temperature and cold resistance, which can be used in extremely harsh environment and special working conditions. Material ZrO2 has perfect properties such like suitable for low and high temperatures, high load capacity, corrosion resistance, nonmagnetic insultated and self-lubrication. Thus it suits for the specific applications which are not available for bearing steel and hybrid construction ceramic bearing materials. ZrO2 full ceramic bearings use zirconia (ZrO2) material for inner/outer rings as well as balls/rollers, retainer material is PTFE as standard, glass fiber reinforced nylon 66(PA66-25), PEEK, PI, SUS316, CU are also used as ceramic bearing retainers.Hybrid ceramic ZrO2 bearings use ceramic ZrO2 balls/rollers (weigh up to 40% less than steel balls/ rollers, depending on size, the lighter ball/roller allows the bearing to spin faster, use less energy to maintain its speed) and steel inner/outer rings(Normally chrome steel GCr15 or stainless steel AISI440). Anticorrosion properties of ZrO2 bearing Application: Food conveyor, Non-magnetic and insulation condition, Dust condition, Vacuum condition, High-temperature condition, Clean condition, Corrosive condition, Food industry, Linear guideway, etc. Description: Full and Hybrid Ceramic Bearing ZrO2Cage: PTFE/PEEK/PI/PA66-25/SUS316/CUVersion: Natural whiteNote: Zirconia(ZrO2) is a cost-effective alternative to Si3N4, it also has…

With the development of mechanical manufacturing industry towards high precision and high speed, the application range of bearings is more and more wide, and the performance requirements of bearings are also higher and higher, especially in some special working environment, metal bearings can not adapt to the demand, or even can not work at all. Because of its low density, high modulus of elasticity, low coefficient of linear expansion, wear resistance, high temperature resistance, corrosion resistance and other excellent properties, ceramic material has become an ideal material for high-speed manufacturing of precision bearings. Advantages and Characteristics of Silicon Nitride Ceramics Although silicon nitride is not the hardest and the most tough material in industrial ceramics, it is considered to have the best mechanical and physical properties in high performance bearing applications. Heat ResistanceGenerally, when the service temperature of steel bearings exceeds 120 ℃, the hardness will decrease and the rolling life will also decrease. Silicon nitride has good temperature characteristics, especially suitable for high temperature environment. Centrifugal ForceThe density of silicon nitride is about 3.24 × 103kg / m3, while the density of bearing steel is about 7.8 × 103kg / m3, which is only about 40% of the density…

Bearing is an important part of mechanical rotation, and its stiffness and working temperature will directly affect the bearing efficiency on the mechanical operation. In order to provide the rotation accuracy of the bearing, increase the rigidity of the bearing device, and reduce the vibration of the shaft when the machine is working, the preloaded rolling bearing is often used, such as the spindle bearing of machine tool. The bearing stiffness is the force required to produce a unit deformation. The elastic deformation of rolling bearing is very small, which can not be considered in most machines. However, in some machines, such as machine tool spindle, bearing Stiffness is an important factor, in which case generally cylindrical roller bearings and tapered roller bearings should be selected. Because these two kinds of bearings are in line contact with the raceway when they are under load, they have small elastic deformation and good stiffness. All kinds of bearings can also be preloaded to increase the support stiffness. Such as angular contact ball bearing and tapered roller bearing, in order to prevent shaft vibration and increase support stiffness, a certain axial force is often applied in advance during installation to make them compress…

Powder metallurgy (PM) is a technology that uses metal powder or nonmetal powder or its mixture as raw materials to manufacture metal materials, composite materials and various types of products through forming and sintering. Its three core elements are technology, materials and equipment, which are widely used in transportation, machinery, electronics, aerospace and other important industrial fields. It is the most potential and dynamic branch of new materials science.