[Auto radiator fan] The bearing is everything.
u003cbru003eThe bearing system of the fan generally recommends the best choice of ball bearings, because the life of the fan heater usually depends on the reliability of its bearings, and the ball bearing system has been proven to have the characteristics of rate and low heat generation. Ball bearings are rolling friction, rolling by metal balls, with a small contact surface and a small friction coefficient; while oil-impregnated bearings have sliding friction with a large contact surface. After long-term use, the oil will volatilize, the bearing is easy to wear, the friction coefficient is large, and the later noise is louder , Short life. In addition to the large ventilation and high wind pressure, the reliability of a good-quality fan is also very important. The type of bearing used by the fan is very important here. High-speed fans always use ball bearings (Ball bearings) while low-speed fans use low-cost oil bearings (Sleeve bearings). Oil-impregnated bearing fans only use one bearing; while ball-bearing fans all need two bearings, a single ball bearing is '1 Ball + 1 SleeveHigher than the single ball is the automobile bearing, namely Two Balls. The life of oil-impregnated bearings is generally 10,000 hours, 30,000 hours for single ball bearings, and more than 50,000 hours for automotive bearings (when the ambient temperature is set below 25°C). The oil bearing used in the fan is sintered with copper-based powder. The oil bearing needs to be lubricated to reduce the sliding friction. The lubricating oil is made of lithium-based grease and special oil. With long-term operation, the oil in the bearing will evaporate and become dry, and the friction coefficient will increase. The operation of the fan will be affected. There may be abnormal noise, slow speed or even no rotation. The ball bearing replaces sliding friction with rolling friction, has a small friction coefficient and overcomes the shortcomings that the friction coefficient is easy to change, so it has strong running stability and a relatively long life.
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