| 摘要 |
PROBLEM TO BE SOLVED: To provide an extension bearing device which prevents generation of sliding friction in a contact part between a dustproof seal for preventing intrusion of dust into a housing, a rotary shaft and a sleeve. SOLUTION: This bearing device is constituted so that the dustproof seal 21 is composed of: a fixing ring 22 having an outer peripheral surface tightly fitted to an inner peripheral surface of the housing and an outer race pressing ring; a metallic ring 23 fixed to the inner peripheral surface of the fixing ring 22; and an annular lubricating oil including member 24 fixed to the inner peripheral surface of the metallic ring 23, and is arranged between an outer peripheral surface of the rotary shaft and the inner peripheral surface of the housing and between an outer peripheral surface of the sleeve and the inner peripheral surface of the outer race pressing ring, and that the inner peripheral surface of the lubricating oil including member 24 is slidingly contacted with the outer peripheral surface of the sleeve. COPYRIGHT: (C)2007,JPO&INPIT
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