Patent ID: 8608382
Filing Date: 2013-12-17
Classification: F16C

Abstract:
1. A static-pressure bearing apparatus comprising a bearing clearance between a fixed body and a sliding surface of a moving body, the moving body is floated and movable above the fixed body by supplying pressurized gas into the bearing clearance, wherein the moving body comprises a main pipe, an orifice, and a static-pressure pad, the orifice is provided at the outlet of the main pipe and adjusts the flow of the pressurized gas, the main pipe opens at an outlet on the sliding surface and supplies pressurized gas, the static-pressure pad is formed to have a vent groove that communicates with the orifice and the static-pressure pad distributes and supplies the pressurized gas that is discharged from the orifice to the bearing clearance, wherein the vent groove consists of a circular groove and plural distributing grooves, the circular groove is formed as a circle to surround the orifice, the plural distributing grooves extend radially from the orifice toward the circular groove and the plural distributing grooves connect the circular groove and the orifice, wherein the vent groove is configured to be symmetrical about a center line of a direction of a movement of the moving body, wherein the vent groove in a direction of a width of the vent groove has a cross-sectional shape formed to be a curve that is convex in a direction perpendicular to the sliding surface, the static-pressure bearing apparatus further comprising an exhaust groove that surrounds the circular groove, wherein the exhaust groove guides and discharges the pressurized gas from the bearing clearance, wherein the pressurized gas is supplied from the vent groove into the bearing clearance, wherein the exhaust groove is formed to be symmetrical about a centerline of a direction that the moving body moves, wherein the exhaust groove in a width direction of the exhaust groove has a cross-sectional shape that is formed to be a curve that is convex in a direction perpendicular to the sliding surface, and wherein the exhaust groove has a cross-sectional area of not less than a cross-sectional area of the circular groove.