| 摘要 |
PROBLEM TO BE SOLVED: To reduce axial parts count in a bearing for backup and to narrow an axial clearance. SOLUTION: In the shaft 31 of the bearing 30 for backup, an inner ring loose rib 17, a shaft snap ring 18 and a shaft snap ring groove 19 provided for a conventional bearing 10 for a backup are decommissioned, while shaft collars 32a and 32b constituting roller interposing grooves 38 are formed at both sides of a shaft on the raceway surface 33. Because of disposing shaft collars 31a and 32b at the both sides of a shaft 31, split-type guide rings 36a and 36c which can be divided into two sections in a semi-arch form, are employed so as to allow mounting a guide ring. The split-type guide rings 36a and 36c at the both sides are supported on the inner peripheral surface of a retainer 35. The split-type guide rings 36b at the center is supported on the inner peripheral surface of an integrated guide ring 37. In this case, decommissioning the inner ring loose rib 17 and shaft snap ring 18 leads to reduction of parts count on the transmission route of an axial load, whereby axial clearance ascribable to the accumulation of the dimensional fluctuation of respective members can be narrowed.
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