Nabtesco Corporation

Teijin Seiki Co., Ltd.

Hitachi, Ltd.

Katsuhiko Yokoyama

Osamu Nohara

Haruo Kodama

Sadayuki Tanabe

Yuichi Asakawa

Shigeru Hosoda

Yoji Asano

Juhyun Yu

Ryouji Azumaishi

A windmill pitch driving apparatus is provided, which is capable of achieving improved durability as well as improved output torque and reduced size. The apparatus includes a fixing mechanism for fixing the output pinion to the output shaft. The fixing mechanism includes a positioning portion and a pressure-applying fixing portion. The positioning portion positions the other end side of the pinion with respect to the output shaft side. The pressure-applying fixing portion biases the pinion toward the output shaft in the direction of the axis P of the output shaft from the one end side and is fixed to the output shaft while applying pressure to the pinion.

Windmill pitch driving apparatus

A yaw drive method of a wind power generation apparatus, in which a second gear engaged with a first gear attached to one of tower or a wind power generation unit supported to the upper end of the tower so as to be capable of yawing and supported to a tower or to the upper end of the tower is rotated by a drive motor attached to the other of the tower or the wind power generation unit for yawing the wind power generation unit. A drive energy, which is supplied to the drive motor for a predetermined time from when the supply of the drive energy to the drive motor begins to start, is made to be smaller than the drive energy supplied to the drive motor in a common yawing.

Speed reducer for use in yaw drive apparatus for wind power generation apparatus, and yaw drive method and apparatus for wind power generation apparatus using the speed reducer

Axial positions of two driven external gears making up each of a plurality of paired-gear groups with respect to an input shaft are made identical, and a different paired-gear group is arranged by being offset in the axial direction of the input shaft . Therefore, only two driven external gears making up the paired-gear group are present at an identical axial position of the input shaft . Consequently, even if the diameters of these driven external gears are made large up to the very limit, these driven external gears do not interfere with each other. Accordingly, it is possible to readily enlarge the reduction ratio based on the driving and driven external gears and

Eccentric oscillating-type speed reducer

Growing community of inventors

Gifu, Japan

Katsuhiko Yokoyama