Teijin Seiki Co., Ltd.

Nabtesco Corporation

Sadayuki Tanabe

Tatsuya Narumi

Osamu Nohara

Katsuhiko Yokoyama

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

If a hydraulic motor () (traveling wheel ()) is rotated (or skidding) at high rate, and a hydraulic motor () is hardly rotated, a detection controller () compares the rotational speeds of both hydraulic motors (). Then the rotation detected by the rotation detectors () to detect the traveling wheel () to be skidding, and moves a piston () to allow a negative brake () to give a braking force to the hydraulic motor (), and rotate the hydraulic motor (). In this way, this invention can release the traveling wheel from skidding without the use of a flow dividing valve.

Hydraulic circuit for traveling

If a hydraulic motor ( ) (traveling wheel ( )) is rotated (or skidding) at high rate, and a hydraulic motor ( ) is hardly rotated, a detection controller ( ) compares the rotational speeds of both hydraulic motors ( ). Then the rotation detected by the rotation detectors ( ) to detect the traveling wheel ( ) to be skidding, and moves a piston ( ) to allow a negative brake ( ) to give a braking force to the hydraulic motor ( ), and rotate the hydraulic motor ( ). In this way, this invention can release the traveling wheel from skidding without the use of a flow dividing valve.

A first friction clutch ( ) is constructed as a negative type friction clutch and a second friction clutch ( ) is constructed as a positive type friction clutch. Spring constant of a second spring ( ) is made smaller than that of a first spring ( ). Therefore, in the middle stage of switching the first and second friction clutches ( ), both of these first and second friction clutches ( ) enter in a connection state. Consequently, a driven member ( ) is driven through either or both of the first and second clutches by a driving shaft, and the free rotation state does not occur.

Power transmission mechanism

In a brake ( ) for a hydraulic motor ( ), a braking piston ( ) is added that can move toward and away from fixed friction discs ( ) and rotating friction discs ( ). A braking passage ( ) leads a high-pressure fluid into the braking piston ( ) to press the braking piston ( ) to the friction discs ( ).

Growing community of inventors

Gifu, Japan

Sadayuki Tanabe