WIND POWER GENERATION DEVICE

摘要

Provided is a wind power generation device which achieves the prevention or reduction of leakage of lubricating oil to the outside by improving an oil seal structure provided in a blade slewing ring bearing (10) of a windmill blade. Specifically provided is a wind power generation device which generates electric power by driving of an electric generator installed in a nacelle by a rotor head rotated by wind power experienced by windmill blades, and which is provided with a pitch control mechanism enabling the pitch angle of the windmill blade to be adjusted via a blade slewing ring bearing (10) installed between the windmill blade and the rotor, the nacelle being installed so as to be able to yaw at the upper end of a tower provided to stand on a foundation, wherein seal mechanisms (14, 20) are attached at both ends of rolling element holding surfaces (11a, 12a) of an outer ring (11) and an inner ring (12) of the blade slewing ring bearing (10), the rolling element holding surfaces facing each other with a rolling element (13) interposed therebetween, the blade side of the seal mechanisms (14, 20) has a double seal structure which is disposed in a blade axis direction with a space portion (23) provided between the seal members (21, 22), and lips of the seal members (21, 22) are pressed against partner wall surfaces by supplying a pressurized fluid to the space portion (23).