Patent ID: 9719492
Date: 2017-08-01
CPC Classifications: F03D,F05B,F16H,Y02E

Claim:
1. A wind turbine rotor comprising a hub, a plurality of blades and at least one pitch system for rotating a blade substantially along its longitudinal axis, the pitch system comprising: a bearing, a motor and a gear system, the gear system comprising a driving pinion operationally connected with the motor, an annular gear arranged to mesh with the driving pinion, additional gear teeth, the additional gear teeth being arranged to mesh with other parts of the gear system at least in a predefined blade position for wind speeds at or below a nominal wind speed, and arranged such that upon movement from the predefined blade position, the additional gear teeth come into contact with the other parts of the gear system before the driving pinion comes into contact with the annular gear; and wherein the additional gear teeth and the other parts of the gear system have less backlash than the driving pinion and the annular gear.