Computer cooling fan, fan bearing system reliability determines the life of the cooling fan and its noise and stability. According to the classification of fan bearings, air-cooled radiator generally has two kinds: oil-bearing fans and ball bearing fans. Although the low cost of oil-bearing, but the oil-bearing sliding friction, contact surface, long-term use, the oil volatilized, easy to wear bearings, friction coefficient, the latter part of the larger noise, short life expectancy. The ball bearing is a rolling friction, with high efficiency and low heat generating characteristics, the friction coefficient of small, low wear and tear, so the service life of up to 40,000 hours, the latter part of the noise is also smaller. With the increasing heat of the computer, oil-bearing fans have obviously failed to meet the cooling needs of the computer, the ball fan has gradually become the mainstream computer cooling fan options.
In the bearing manufacturing and processing, the main links that affect the quality are the manufacturing of steel balls, the selection of oil products, the cleaning in the production process, the use of aerospace industrial grade stainless steel and the precision assembly. For the fan miniature motor bearings, the current domestic production of bearings limited to technical reasons, but also can not meet the high-speed, high-performance fan quality requirements, the performance of the product after use are not satisfactory. What is more, there are some domestic unscrupulous manufacturers, often used scrap bearing production of the same price and performance so-called ball fans, a serious violation of the rights and interests of consumers.
Only by appearance, high-quality bearings and inferior bearings are not obvious, but the technical content of the two is incomparable. Preload to the bearing on the example, the domestic manufacturers and international brands in the processing process to reflect the obvious technical differences. Pre-pressure, refers to the process of fixing the ball in the bearing sleeve, which requires the ball and bearing sleeve surface with close, there is no gap in order to minimize the ball wear. Usually in the domestic manufacturers of bearings, pre-pressure up and down before the bearing sleeve is right, because the ball size and bearing sleeve certainly there will be some errors in size, so in the preload force, there are always between the ball bearing sleeve 5-10 Micrometer gap, that is, this gap, making the bearing greatly increased the degree of wear and tear, shortened life expectancy. The same process, NSK bearing manufacturing, the upper and lower bearing preload will be a relative distance of about 5 microns, so that the bearing sleeve will be tightly pressed after the ball, so that the gap between the reduced Zero, in the fan work, the ball will not be beating, so that wear and tear to a minimum, to ensure smooth flow of the fan and long-term high-speed operation.
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