Wind turbine pitch control hub.

摘要

In a variable pitch wind turbine system, pitch angle is determined by a pneumatically pressurized hydraulic actuator (18) connected between crank arms (42, 44) on the blade pitch axles. The hydraulic line extends coaxially through the rotor drive (17) shaft via a rotary union to a gas-charged accumulator on the yaw carriage. The pitch axes are positively coupled for 1:1 counter-rotation by a gear train (60), preferably lying on the opposite side of the rotor axis from the hydraulic actuator.