Sintered bearing

摘要

Provided is a sintered bearing (1) including an inner layer (2) and an outer layer (3) formed by integral molding, the sintered bearing (1) having a bearing surface (A) formed on an inner peripheral surface (2a) of an inner layer (2). The inner layer (2) is made of sintered metal containing Fe and a hardness increasing element (such as Ni or Mo). The outer layer (3) is made of sintered metal containing Fe and no hardness increasing element. A concentration gradient of the hardness increasing element is present at an interface between the inner layer (2) and the outer layer (3).

主权项

1. A sintered bearing, comprising:
an inner layer; an outer layer formed on a radially outer side of the inner layer; and a bearing surface formed on any one of an inner peripheral surface of the inner layer and an outer peripheral surface of the outer layer, wherein one of the inner layer and the outer layer, which has the bearing surface, is made of sintered metal containing Fe and a hardness increasing element, and another of the inner layer and the outer layer, which has no bearing surface, is made of sintered metal containing Fe and no hardness increasing element, wherein the inner layer and the outer layer contain Cu, and wherein a mixing ratio of the Cu in the another of the inner layer and the outer layer, which has no bearing surface, is lower than a mixing ratio of the Cu in the one of the inner layer and the outer layer, which has the bearing surface.