DEVICE FOR DRIVING PITCH OF WIND TURBINE BLADE, ROTATING WIND TURBINE BLADE WITH SAME, AND WIND TURBINE DEVICE

摘要

In order that the pitch angle of a wind turbine blade can be changed using a simple, lightweight, low cost, and highly durable structure without impairing the strength of each portion such as a rotor hub, the present pitch drive device (15) is characterized in comprising: a cylinder support section (27) provided to the rotor hub (10) and having a support point (31) located on the side of the cylinder support section (27) which is opposite the front end surface (22)(non-supported end section) of the rotor hub (10); an eccentric connection point (34) provided at an eccentric position on the root-side end surface (11b) of the wind turbine blade (11); and a cylinder (35) disposed so as to penetrate through the non-supported end section (22) of the rotor hub (10) and configured in such a manner that a connection section (38) provided to the portion of the cylinder (35) which protrudes further outward than the non-supported end section (22) is rotatably connected to the support point (31) through a spherical surface joint (39) and in such a manner that a connection section (40) located on the inner side of the non-supported end section (22) is rotatably connected to the eccentric connection point (34) through a spherical surface joint (41).