Sintered bearings and bearing assemblies

Abstract

This invention comprises a cylindrical sintered body, formed by sintering raw material powder with metal as the main component, containing lubricating oil. One axial end is designated as a first bearing portion, and the other axial end as a second bearing portion. A sliding surface is formed by the inner diameter surfaces of the first and second bearing portions, and an intermediate portion is formed at the center of the bearing's inner diameter. This intermediate portion has a larger diameter clearance portion compared to the inner diameter surfaces of the first and second bearing portions. A density difference is provided between the first bearing portion, the second bearing portion, and the intermediate portion.

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