MANUFACTURING METHOD FOR SINTERED OIL RETAINING BEARING AND SINTERED OIL RETAINING BEARING

摘要

PROBLEM TO BE SOLVED: To effectively control an offset of a bearing by forming a bearing hole at the inside of a sintered body after sintering in a manufacturing process of a sintered oil retaining bearing. SOLUTION: The sintered oil retaining bearing has a bearing hole with a circular cross section supporting a rotary shaft formed on a bearing body made of sintered metal, and is provided with a shaft supporting portion with a uniform diameter having the inside as a frictional surface and a tapered enlarged diameter portion formed continuously with the shaft supporting portion with its diameter increasing outwardly. The bearing hole having a uniform diameter including the shaft supporting portion is formed by pressurizing the inner periphery of the cylindrical sintered body W after the sintering process, and the enlarged diameter portion is formed continuously with the shaft supporting portion by pressurizing again the inner periphery of the sintered body W. COPYRIGHT: (C)2005,JPO&NCIPI