To provide a speed-up device of a wind-driven generator and a support mechanism of a rotating shaft, capable of inexpensively restraining the occurrence of sliding in a bearing.
This speed-up device 10 of the wind-driven generator is provided for increasing a speed of rotation of a wind turbine. The rotating shaft 19 of a gear 18 for transmitting the rotation of the wind turbine is rotatably supported by a first bearing 20 and a second bearing 21. The first bearing 20 has an outer ring 22 supported by a casing of the speed-up gear 10, an inner ring 23 installed on the rotating shaft 19, and a preload applying member for enhancing contact pressure with a roller 24 arranged between the outer ring 22 and the inner ring 23 by partially pressing the first bearing 20 from the outside.
SASAKI MASASHI
MIYAKE HISAO
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Kunio Ueda