FAQ

Ans.
Fluid Dynamic Bearing is a kind of mechanical design, which can generate “dynamic uniform oil film”, and make “cyclic pressure" around shaft surface. This oil film will be good enough to avoid friction between shaft and bearing. The cyclic pressure could be damping and amend concentricity to shaft, make the rotation smoothly and quietly.

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There are bearings on the market, declared as FDB, they use sintering oil porous but without Herringbone Grooves, or Herringbone Grooves machined but without sintering oil porous, all none of effective dynamic oil pressure inside bearing! Only Jialian-Tech HGFDB, can generate “dynamic uniform oil film and cyclic pressure”, faithful make great efforts for high performance rotations.

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Jialian-Tech HGFDB is a special innovative technology of micron precision Herrigbone Groove, which converge lubricating oil to generate dynamic uniform oil film in the clearance between shaft and bearing. It makes cyclic pressure around shaft surface, steadily maintain shaft at none-friction revolution. According to rotation, the higher speed up the stronger fluid cyclic pressure raised, can make the fan motor quieter and longer life. Owing to the real fluid dynamic lubrication, HGFDB be evaluated the best CP value bearing in current market.

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In current 3C market, the bearing of cooling fan, there are Sleeve(Copper sintering with oil immerged), CB(Ceramic Bearing), CuTB(Cu Tube Bearing), and BB(Ball Bearing). Even if some of them marking FDB, actually they all have no fluid dynamic lubricating effect. Face to coming 5G/6G of high frequency, high speed and high heat era, the computers, the Video Game Player, Metaverse, Workstation, Server, etc., must have high speed fan motor for cooling. Jialian-Tech HGFDB, with Herringbone Groove, with real Fluid Dynamic Bearing, do provide quite/stable/long-life rotation, is the most ideal bearing!

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The bearing that takes water as a lubricant, only used in water pump and propeller of boat. Water is not a good lubricant for shaft and bearing of rotating system. They use it just for the sake of convenient. Many metals could be oxidized and corroded in water. To change metal into ceramic will be better choice. The most revolution machine, such as air pump, electric motor, cooling fan, gear box, flywheel, pully, conveyer rotor, gyroscope, and etc., all use the oils as bearing lubricant.

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The traditional copper sintering oil immerged Sleeve bearing, its low accuracy, cause failure easy, usually be used for the fan-motor of low speed and low price. The ball bearing, complicate structure makes it expensive. Five or more steel balls running around ring rails, to cause high frequency noise when in rotation. In case of running increased, ball bearing’s noisy will be increased in proportion. Jialian-Tech HGFDB also pertains to copper sintered bearing, but strengthen on the structure, high precision Herringbone Grooves design, and unique lubricant immerged. All above generate low noises, long-life running. Not only in low/middle speeds, but also in high/super-high speeds fan-motor, HGFDB still gain excellent CP value!

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The function of fan is to move air to dissipate the heat in device. The 3C equipment always closed to human, so that the noise of fan-motor becomes important quality issue. In a cooling fan, the noise comes from imbalance of rotator, airflow field design, electric and magnetic field matching, the resonance effect of chassis with rotating frequency, and lubricating system of bearings. In regard to lubricating system, Jialian-Tech HGFDB having unique lubricant and Herringbone Grooves in bearing, which generate powerful dynamic oil film and cyclic pressure in operation. It can provide the most quiet and long-lasting rotation on whole range speeds. HGFDB is generally acknowledged the best bearing in the world.

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The bearing types used in PC fan-motor include: S (Sleeve bearing, sintering with oil immerged), BS (one Ball and one Sleeve bearing), CB (Ceramic Bearing), CuTB (Cu-Tube Bearing with grooves engraved), BB (Two Ball Bearings) and HGFDB (Herringbone Groove Fluid Dynamic Bearing). As the service life should be related to accuracy, temperature and rotating speed. If compared in same conditions, a general market evaluation is: S<BS<CB<CuTB<BB<HGFDB.