| 摘要 |
PROBLEM TO BE SOLVED: To increase a service life of a bearing unit by improving efficiency of supply of a lubricating oil to an inner part. SOLUTION: This bearing unit comprises: the inner part made of a green compact molded sintered metallic body having bearing parts in both end parts; and an outer part for concentrically pressing the inner part into an inner circumferential face side. The outer part is configured by a green compact sintered metal structure having a density lower than the inner part. Thereby, the lubricating oil is sequentially sucked from the outer part side into the inner part to become easy to move, so that the bearing unit having small vibration, excellent silence, and the increased service life is obtained. When pressing the inner part into the outer part in time of production of the bearing unit, the outer part absorb stress, so that a bearing internal diameter dimension of the inner part is not deviated. COPYRIGHT: (C)2007,JPO&INPIT
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