摘要:
Provided is a sintered gear (1) as a sintered machine part, which is formed of a sintered compact (M′) and which rotates in conjunction with an input of a load from another member onto a radially outer surface while sliding with respect to a shaft (S) inserted along an inner periphery, in which the sintered compact (M′) includes an inner layer (2) containing Cu and an outer layer (3) sintered together with the inner layer (2) under a state of being held in contact with the inner layer (2), in which the outer layer (3) includes, as main components, Fe, Cu, and Sn as a low-melting-point metal, and a metal structure of the outer layer (3) includes, as main constituents, Fe structures and Cu—Sn alloy structures, which exist at a grain boundary of the Fe structures and bind the Fe structures to each other.