Patent ID: 6299356
Filing Date: 2001-10-09
Classification: F16C,Y10T

Abstract:
A hydrodynamic type porous oil-impregnated bearing comprising a porous bearing body formed with a bearing surface on an inner peripheral surface thereof, and oil retained in pores of said bearing body by impregnation of lubricating oil or lubricating grease,wherein said bearing surface has a first region in which a plurality of hydrodynamic pressure generating grooves are circumferentially disposed across the entire first region, a second region in which a plurality of hydrodynamic pressure generating grooves are circumferentially disposed across the entire second region, and an annular uninterrupted smooth region positioned between the first and second regions to share borders with the first and second regions, each one of the hydrodynamic pressure generating grooves of the first region being inclined in a first direction relative to a longitudinal axis of the bearing body, each one of the hydrodynamic pressure generating grooves of the second region being inclined in a second direction relative to the longitudinal axis, the second direction being opposite to the first direction, the annular uninterrupted smooth region being entirely on a centerline of the bearing surface intersecting the longitudinal axis perpendicularly, so that the bearing surface is symmetric with respect to the centerline.