Abstract
In order to achieve high precision machining, hydrostatic journal bearing is widely adopted by machine tool manufacturers in recent years. There are various of system parameters that will affect the performance of bearings respectively. Geometry parameters include bearing length, inner diameter, recess size and number of recess. Operating parameters include restrictor type, lubricant viscosity, supply pressure and eccentricity. However, most previous studies tended to discuss the effects of operating parameters on the performance of hydrostatic journal bearings at given bearing dimensions like length and inner diameter. Consequently, this study investigates the static performance (such as load capacity, stiffness and flow) about various dimensions of multi-pad and multi-recess type hydrostatic journal bearings with constant-resistant restrictor compensation. According to the results, recess size of better stiffness for multi-recess type is relates to the ratio of bearing length to inner diameter. Also, comparative result shows that multi-recess type’s flow is neerly half of multi-pad type’s. Keywords: finite difference method, system parameter, multi-recess, multi-pad