"Cooling Fan Manufacturer" the use of oil-bearing copper-based sintered powder is made by using a lubricating oil bearings need to reduce the number of sliding friction, by lithium grease lubricating oil system Stuttgart modulation. With the long run, "Cooling Fan Manufacturer" within the bearing oil will evaporate and dry, the friction coefficient increases, fan operation affected may appear different sound, speed Pianman not even turn on. The ball "Cooling Fan Manufacturer" Bearing replaced by rolling friction sliding friction, low coefficient of friction and to overcome the shortcomings of the friction coefficient is apt, therefore running stability, life is relatively much longer.