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What is the operating dynamic thermal balance temperature of engineering plastic sliding bearings?
Release Date:2015-10-23    Total Hits:1083bout
EPB plastic plain bearings experience sliding friction during operation. The friction couple that exists due to the relative motion of the mating shaft and the inner surface of plastic sliding bearings gives rise to frictional heating; this frictional heating causes the temperature of the friction surface to increase, and the amount of frictional heating is closely connected with the coefficient of friction of the plastic sliding bearings. Frictional heat is mostly dispersed through two pathways: The first consists of heat conduction through the plastic sleeve and the bearing's seat holes, and into the air. The second consists of conduction through the bearing's mating shaft and into the air. The efficiency of these two heat dissipation pathways directly influences the temperature of the working surface of the plastic plain bearings. Frictional heat starts to be produced when plastic plain bearings have just begun operation; but although the temperature of the bearing's working surface increases at this time, it will not continue to rise beyond a certain point. When a dynamic balance is achieved between the production and dissipation of frictional heat, the temperature of the plastic sleeve's working surface will stabilize. The temperature at this time is termed the "dynamic thermal balance temperature." This temperature is unfixed; the self-lubricating performance of the plastic sleeve material, the smoothness of the shaft, operating pressure and velocity, ambient temperature, and many other variables will directly influence plastic plain bearings' dynamic thermal balance temperature. This is also why the engineers developing CSB's EPB series plastic sleeve material have focused much of their attention on self-lubrication performance.

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