THE INTELLIGENT OPERATION OF NANO-GROOVED MICROBEARING SURFACES IN COMPUTER HDDS

摘要

The nano- and micro-grooves on two cooperating micro-bearing surfaces depend strongly on the intelligent operation of computer HDDs. Therefore, the main topic of this paper is concerned with the influence of micro- and nano-structures in cooperating surfaces on intelligent micro bearing behaviour. The measurements are performed for a new, unused cooperating journals and sleeve surfaces of micro bearings in a new Hard Disc Driver 2.5, Samsung, HM 160 HI, 5400 rpm, utilising a atomic force microscope and scanning electron microscope and micro-x-ray analysis. The structure and geometry of nano-grooves and the composition of the roots in the material of the journal and sleeve alloy enables one to indicate the proper micro-bearing operation process and hydro-dynamic lubrication model. These surfaces are radically different in comparison to cooperating surfaces occurring in micro bearings inside the computer ventilator. The presented measurements indicate that, in the micro-bearing gap, the changes of lubricant viscosity in the gap height direction have important implications on the HDD operation. In classical bearings such influences never occur.