SINTERED METAL BEARING, SHAFT MEMBER FOR A PLAIN BEARING UNIT, AND PLAIN BEARING UNIT PROVIDED WITH SAID SHAFT MEMBER

摘要

A sintered metal bearing (1) has a shaft (2) and a sliding surface (3) and is provided with: a sintered metal bearing body (5) that is formed from a different metal structure than the shaft (2) and has many internal holes (4); and a resin film (6) that is formed on a prescribed surface of the bearing body (5) and constitutes the sliding surface (3). The resin film (6) is formed so as to leave surface openings (7) that connect with the internal holes (4), and upon sliding against the shaft (2), part (10) of said film detaches from the bearing body (5) and adheres to the surface of the shaft (2). A shaft member (13) used in the plain bearing unit is fitted into a sintered metal plain bearing (sintered metal bearing (12)) for use, said sintered metal plain bearing either comprising mainly a copper structure (19) or having a copper structure (19) and an iron structure (20). The shaft member (13) has a sliding surface (14) that slides against the sintered metal bearing (12). Said shaft member (13) is provided with a metal shaft body (17) and a resin film (18) that is formed on a prescribed surface of the shaft body (17) and constitutes the sliding surface (14). The resin film (18) is formed from a resin that, compared to the copper structure (19), has excellent adhesiveness to the shaft body (17), and upon sliding against the sintered metal bearing (12), part of said film just detaches from the shaft body (17).