Bush bearing

A cylindrical bush bearing comprising, an inner peripheral surface having a sliding surface, an outer peripheral surface having a cylindrical surface, one annular axial end face, and a tapered surface interposed between the cylindrical surface and at least said one annular axial end face, a difference γ(=r1-r2) between a radius r1 at the cylindrical surface and a radius r2 at an outer peripheral edge of the one annular end face is in a range of not less than 0.1 t and not more than 0.3 t, where t is a wall thickness of the bush bearing at the cylindrical surface of the outer peripheral surface, the bush bearing including a multilayered plate which has the sliding surface on one surface thereof and is convoluted into a cylindrical shape such that the sliding surface is positioned on an inner peripheral side, said multilayered plate including a back plate entirely coated with copper, a porous sintered metal layer adhered integrally to a copper coating layer on one surface of the back plate, and a sliding layer including a synthetic resin with which the porous sintered metal layer is impregnated, and which has self-lubricity and wear resistance, the cylindrical surface, the tapered surface, and the one annular end face consisting of an exposed surface of the copper coating layer, said bush bearing further comprising a first smooth circular arc surface interposed between the tapered surface and the cylindrical surface, the first smooth circular arc surface having a radius of curvature which is not less than 0.1 mm and not more than 1.0 mm, and a second smooth circular arc surface interposed between the tapered surface and the one annular axial end face, the second smooth circular arc surface having a radius of curvature which is not less than 0.1 mm and not more than 0.5 mm.