| 摘要 |
PROBLEM TO BE SOLVED: To provide a vertical shaft supporting structure provided with a double row rolling bearing capable of supporting properly in accordance with load situation in each row in the environment in which different load acts depending on left and right rows. SOLUTION: When applying a double row automatic aligning roller bearing 21 provided with an inner ring 22, an outer ring 23, spherical face rollers 24, 25, and a holder 26 to a double row rolling bearing supporting an output shaft of a swivel reduction gear, a side where axial load loading capability of the bearing is high is arranged on a lower side. COPYRIGHT: (C)2006,JPO&NCIPI
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