METHOD FOR MANUFACTURING SINTERED BEARING, AND SINTERED BEARING

摘要

PROBLEM TO BE SOLVED: To provide a sintered bearing capable of accurately supporting a shaft having sometimes relative rotation in a state inclined to an axis.SOLUTION: A method for manufacturing a sintered bearing 1 including on the inner peripheral surface a cylindrical part 2 having a constant diameter and a one-side diameter enlarged part 3 (a diameter enlarged part) adjacently placed on one side of the cylindrical part 2 in the axial direction and having a diameter gradually enlarged toward the one side in the axial direction comprises: pressing a cylindrical part molding surface 52a of a core 52 having the cylindrical part molding surface 52a corresponding to the shape of the cylindrical part 2 and a one-side diameter enlarged part molding surface 52b corresponding to the shape of the one-side diameter enlarged part 3 continuously provided in the axial direction into the inner peripheral surface of a cylindrical sintered body 30' from one side in the axial direction when sizing the sintered body 30'; and molding the cylindrical part 2 and the one-side diameter enlarged part 3 on the inner peripheral surface of the sintered body 30' by pressing the one-side diameter enlarged part molding surface 52b onto an inner peripheral surface 30a' of the sintered body 30' in the state of restraining the outer peripheral surface of the sintered body 30' by a die 51.SELECTED DRAWING: Figure 9