| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil-impregnated sintered bearing capable of alleviating concentrated stress occurring on a bearing face by avoiding local contact with a shaft and forming an excellent oil film regardless of the supported position of the shaft. SOLUTION: On one side in the axial direction of the bearing face of the sintered oil retaining bearing, a first enlarged diameter face 5 is provided with the size of its inner diameter smoothly enlarging toward one end face of the sintered oil retaining bearing. On the other side in the axial direction, a second enlarged diameter face 6 is provided with the size of its inner diameter smoothly enlarging toward the other end face of the oil-impregnated sintered bearing. The bearing face is provided with a plurality of surface opening holes 8, and accompanying relative rotation of the shaft, lubricating oil retained in an inner air hole 3 oozes out from the surface opening holes 8 of the bearing face opposing an outer peripheral face of the shaft. In the first enlarged diameter face 5 positioned at one side in the axial direction of the bearing face, the percentage of the surface opening holes 8 on the surface (so called surface aperture rate) becomes gradually smaller from a cylindrical face (small diameter) toward an end face (large diameter) side. COPYRIGHT: (C)2009,JPO&INPIT
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