Bearing Method Terminology
Source: China Bearing Network | Time: 2013-01-04
The bearing method refers to the type of bearing used in air-cooled radiator fans. In mechanical engineering, there are various types of bearings, but those used in radiator systems are typically categorized based on their fundamental operating principles. These include sleeve bearings (sliding friction), ball bearings (rolling friction), and hybrid methods that combine both. In recent years, manufacturers have introduced new technologies such as magnetic levitation bearings, fluid dynamic bearings, hydraulic bearings, foil bearings, and nano-ceramic bearings, all of which are improvements on traditional designs while maintaining the same basic principles. Sleeve bearings operate using sliding friction and rely on lubricating oil as a lubricant and friction reducer. They are initially quiet and cost-effective to produce, but they suffer from significant wear over time. Their lifespan is generally shorter than that of ball bearings. Over time, the oil seal may degrade, leading to oil evaporation and dust entering the bearing. This can cause the fan speed to decrease, noise to increase, and eventually lead to severe vibration or failure. To address this, users often need to refill the oil or replace the entire fan. Single ball bearings (1 Ball + 1 Sleeve Bearing) are an improvement over traditional oil-impregnated bearings. They use a combination of rolling and sliding friction, where a single ball bearing is paired with an oil bearing to reduce costs compared to double ball bearings. The rotor and stator are lubricated by the ball and oil, improving durability and reducing instability. While this design improves life to around 40,000 hours, it does introduce more operational noise compared to ball bearings, though still less than double ball bearings. Double ball bearings (2 Ball Bearings) are considered superior due to their rolling friction mechanism. They use two ball bearings with high-quality steel balls that rotate around the shaft. This results in lower friction and better performance compared to sleeve bearings. Double ball bearings offer longer life—typically between 50,000 to 100,000 hours—and better resistance to aging, making them suitable for high-speed fans. However, they are more expensive to manufacture and tend to be noisier at the same speed level. They also provide better sealing, especially when embedded within the fan housing, ensuring a stable working environment. As a result, most large-diameter fans operating at 5,000 RPMs typically use double ball bearings. Foil bearings, developed by CoolerMaster, are an advanced version of traditional oil-impregnated bearings. They use wear-resistant materials and hollow structures to reduce friction between the bearing and the shaft. A reverse spiral groove and oil reservoir help prevent oil loss during operation, extending the bearing's life. This design significantly reduces noise and improves efficiency. Hydrodynamic bearings (Hypro Bearings), developed by ADDA, are an improvement on oil-impregnated bearings. They feature a larger oil reservoir and a return oil circuit, reducing oil leakage and lowering operational noise. These bearings can last over 50,000 hours and are commonly found in AVC radiators, although not all models use them. Hydraulic bearings, pioneered by AVC, improve upon oil-impregnated bearings by increasing oil storage capacity and incorporating a return oil system. This results in quieter operation and extended service life, up to 40,000 hours. Despite being an oil-based system, they offer much longer life than standard oil-sealed bearings. Magnetic levitation bearings, developed by Sunon, enhance the durability of oil-impregnated bearings by using special materials and surface treatments. Combined with magnetic levitation technology, they significantly extend the bearing’s lifespan and improve heat resistance. Magnetic suspension bearings (MS) use magnetic fields to suspend the rotor, reducing direct contact and friction. However, they are not a standalone bearing method but rather an auxiliary technique, often combined with ball or oil bearings. This technology is not widely accepted in Europe and America. Nano-ceramic bearings (NCB), introduced by Foxconn, are oil-impregnated bearings enhanced with ceramic materials. They use specialized polymers and additives, along with cerium oxide, to reduce wear and improve lubrication. These bearings are highly resistant to high temperatures and have a long service life—often exceeding 150,000 hours. Although not truly nano-scale, the term "nano" is used to attract attention. --- **Related Bearing Knowledge:** Rolling bearings, heating device methods, imported bearing devices, bearing cleanliness, impact on bearings, China’s bearing industry, green production, pumping machine bearing protection techniques, analysis of bearing performance. This article is linked to http:// Please refer to China Bearing Network at http:// Previous: How to judge the life of TIMKEN bearings after work sound: Below is a list of crankshaft model numbers and matching manufacturer models.
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