T-Blog, Your Bearing Wikipedia

I was once a piece of iron Coming through a great deal of difficulties Smelting from iron ore Until the billet is formed Continuously quenching from lots of processes Built me an indomitable and undaunted spirit And was toughened and hardened into steel. I have thought it would be free of suffering from now on But with a big BANG I was thrown into the furnace again The burning of fire The beating of a hammer Forged me into a ring That moment I felt aggrieved As I lost my heart However The suffering did not stop I was clamped inside the machine tool Turning tools were moving up and down Cutting me mercilessly I screamed I struggled But was thrown into the furnace again After annealing, quenching and tempering Something’s changed inside me I was more tenacious than ever Although with a funny pitch-black appearance As per drawing size After carefully hard turning, drilling, grinding and polishing The error was kept within ±1um Finally I became the look from the drawing And was assembled into a finest machine~

Design Variants To allow the bearings to accept the maximum number of balls, four point contact ball bearings are designed with split inner ring or with split outer ring so these bearings have two basic types, one is featured two half inner ring(QJ series), the other is featured two half outer ring(QJF series). TBB four point contact ball bearings have the contact angle of 35°. We can both provide QJ series and QJF series on request. TBB four point contact ball bearings with outer ring diameters of more than φ160mm are produced with two locating slots in their outer ring (suffix N2), we can also provide small size of outer diameter within φ160mm with locating slots. Tolerance TBB four-point contact ball bearings are produced to the normal tolerance class (PN or P0) as standard. Other tolerance classes such as P6 or P5 are available on request.  ​Cages TBB four-point contact ball bearings are fitted with outer ring centred solid brass cage (suffix MPA or MA, MPA-Solid window cage, guidance by the outer ring, it is the most common type; MA-Solid brass cage, guidance by the outer ring) as standard, please refer to the picture left. Internal Clearance TBB four-point contact…

The PTC (Power Transmission and Control) Asia is an international trade fair for power transmission and control, which takes place once a year in Shanghai. Since its foundation in 1991 it has established itself as the most important trading platform of the industry and for many international companies it is the basis for their entry into the Chinese market expecting enormous growth rates during the coming years. The exhibition is divided into the areas of fluid technology, mechanical transmission (MTPE), fasteners & springs and bearings. The second edition of the International BearingEXPO & Conference in Shanghai will be held this year during the PTC ASIA show between 23 – 26 October 2019. After the successful introduction in 2018, the concept will be enlarged with the BearingEXPO Pavilion and B2B meetings, designed for the International bearing manufacturers, distributors, end-users and solution providers. For more details please direct to PTC official website. At 2nd China International Import Expo, 3 top bearing companies including SKF,TIMKEN,NKE listed in the panel of approved suppliers of China Energy. The second China International Import Expo (CIIE) concluded Sunday, with 71.13 billion U.S. dollars worth of tentative deals reached for one-year purchases of goods and services. The amount rose…

NSK has developed a new ultra-high-speed bearing ideal for electric vehicles, including battery electric, hybrid, and other new energy vehicles. The new bearing enables electric motors to operate at higher speeds, improving fuel economy (reducing power consumption per unit distance), increasing maximum vehicle range, and contributing to enhanced user comfort. NSK is targeting 10 billion yen in sales by 2030. 1. Development Background Protecting the environment is vital to the continued prosperity of societies around the world. To enhance sustainability, the automotive industry is rapidly expanding the development and production of electric vehicles, hybrids, and other new energy vehicles. However, maximum range on a single charge remains a concern for consumers, and there is significant demand for larger capacity battery packs and/or improved efficiency to allow for greater flexibility and peace of mind when purchasing battery EV and other new energy vehicles. In light of these needs, automakers are pursuing smaller and lighter automotive components, and developing faster, higher output motors operating at higher efficiencies. Accordingly, bearings used in powertrains, especially in electric motors, are being subjected to increasingly higher speeds and performance demands. Bearing rotation during high speed operation can cause grease deterioration due to high temperatures, resulting in…

Size from 2mm to 6m Bearings vary in sizes. The smallest “miniature bearing” in the world is with ID 0.6mm× OD 2.0mm× Thickness 0.8mm, which is used in micro motor. The large-size bearing, with an outer diameter of 6m and a weight of more than 15 tons, is used in the large shield machine for tunneling. This kind of large bearing is used when excavating the cross sea tunnel under the Dover strait connecting Britain and France.  400,000 rpm The dental drill used by dentists (commonly known as dental mobile phones) is equipped with bearings that can rotate at ultra-high speed. It uses two ultra precision bearings with inner diameter of 3.0mm × outer diameter of 6.0mm × width of 2mm and steel ball diameter is of 1.0mm. They can rotate at an amazing speed of 400,000 rpm, which greatly reduces the vibration of dental mobile phones, thus greatly reducing the pain of patients during treatment.  Ball Speed 160 m/s The main shaft bearing of jet engine V2500 of international airliner has a rolling speed of 160 m/s, equivalent to 580 k/h. It is because of using this high-performance high-speed bearings that the engine can run safely for a long…

With the wide application of PWM and IGBT in motor, the problems caused by electromagnetic damage such as electric corrosion of bearing are more and more prominent. What causes electromagnetic damage of bearing? Common mode voltage is the main cause electromagnetic damage. When the bearing is running at high speed, there will be a fluid oil with strong insulation between the roller and the inner & outer raceways. Due to the constant change of common mode voltage, fluid film is charging and discharging, leading to currents. It has a continuous thermal effect on the lubricant, which will cause deterioration, deficiency, carbonization of lubricant, thus affecting the life of bearing. Under the deficiency of lubricant, the shaft current directly passes through the bearing and discharges on the contact surface of the bearing, which will cause teeth electric erosion along the rolling direction. When the common mode voltage on both sides of the fluid film is too large, the fluid film will be broken down, resulting in EMD currents. It will cause electrical erosion pits on the raceway, which usually need to be observed under the microscope. And the raceway appears dim and tarnished. Solution In PWM Frequency Modulation Motor, EMD current…