| 摘要 |
PROBLEM TO BE SOLVED: To provide a shaft supporting structure capable of suppressing the occurrence of variation in a shaft supporting diameter of a bearing and inexpensively forming a breathing groove. SOLUTION: A wrapped bush 4 rolled in a cylinder shape is press-fitted into an inner face of an insertion hole 3 of the bearing 2, and a shaft 1 is directly slidably supported on an inner peripheral face of the wrapped bush 4. The wrapped bush 4 is made of a rectangular metal plate rolled into a cylinder in a substantially C shape, and forms a gap S between windings by the gap of the C shape. Further, the breathing groove 5 comprising a linear groove for constantly communicating spacesα,βis formed by the gap S between windings and the inner face of the insertion hole 3. The shaft supporting diameter of the bearing 2 is the size of an inner diameter of the wrapped bush 4 attached in the insertion hole 3, and is determined by the inner diameter of the insertion hole 3 of the bearing 2 and the plate thickness of the metal plate composing the wrapped bush 4, so that the shaft supporting diameter can be managed with high accuracy. Further, as the insertion hole 3 can be formed by only drilling work and the wrapped bush 4 can be formed by just rolling a metal plate, the cost can be suppressed. COPYRIGHT: (C)2009,JPO&INPIT
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