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Abstract: Friction properties of micro journal bearings are
investigated with special developed test-rig. The bearings with journal
diameter of several hundreds of micro meter are subjected to a small
contacting load of several milli-Newton. Three kinds of bearing
materials including mild steel, copper and cemented carbide are tested
against the journal made of high-carbon steel under different contacting
load and rotation speed. It is found that the material hardness and the
surface roughness of the bearing have obvious influence on the friction
coefficient. The change of rotation speed (100~1 200 r/min) has small
influence on friction coefficient. The change of contacting load (5~70 mN)
only result in slight decrease of friction coefficient. Among the three
pairs of micro bearings, the copper bearing against high-carbon steel
journal exhibits best friction performance.
Key words: Micro bearings Small load Fraction performace Material
hardness Surface finish
CLC No: TG115.58
国家自然科学基金(59705007)和上海市科委启明星计划基金(97QF14008)资助项目. 选自2000年第一届国际机械工程学术会议, 20011220
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