Reduction of Power Loss in Hydrostatic Bearing for Machine Tools

Abstract

Hydrostatic bearing has high rigidity, damping properties and high rotational accuracy, and is suitable for wheel spindle of grinder. However, due to the viscous force of the fluid, the power loss of hydrostatic bearing is larger than that of the other bearings. Therefore, a reduction of power loss is desired. In the previous paper, we have reported that the proposed hydrostatic bearing with the pure water as a lubricant can reduce the power loss by about 30 %. In this research, the power of hydrostatic bearing with a mineral oil, which is commonly used for a lubricant of machine tools, is evaluated by fluid simulation and measurement.