G1101-2-4 水静圧軸受における軸受隙間や軸受絞りの誤差の影響(機素潤滑設計一般セッション2)

概要

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Water hydrostatic bearings are attractive for machine tool applications because of the low viscosity and higher thermal conductivity of water as lubricant fluid. In general, the water hydrostatic bearing requires small bearing clearance and small diameter of restrictors in order for reducing water flow, due to its low viscosity. Thus, even small dimensional errors in the clearance and restrictor cause significant deterioration in its performances. Thus, the present paper studies the influence of the dimensional errors on the load capacity and stiffness of the water hydrostatic bearings by the numerical calculations. In our bearing design, the diameter of restrictor was ideally designed so that the recess pressure becomes the half of the supply pressure. As a result, we found that the stiffness takes maximum value when the clearance is 79 % of original design. In contrast, if the restrictor has dimensional error in diameter, the maximum stiffness can be obtained at 115 % of designed diameter.
2009-09-12