Patent ID: 8109729
Filing Date: 2012-02-07
Classification: F03D,F05B,F16C,Y02E

Abstract:
1. A wind turbine, comprising: a rotor including an axis of rotation and further including at least one wind turbine blade connected to a rotor hub through at least one pitch bearing; said at least one pitch bearing comprising at least one outer ring, at least one centre ring and at least one inner ring, said at least one pitch bearing further comprising a first rolling element arrangement including at least two separate rows of rolling elements arranged between said centre ring and a first ring of said inner ring and said outer ring, and a second rolling element arrangement including at least one row of rolling elements arranged between said centre ring and a second ring of said inner ring and said outer ring; wherein a first row of said at least two separate rows of rolling elements is arranged at a first row distance from said rotor axis of rotation and wherein a second row of said at least two separate rows of rolling elements is arranged at a second row distance from said rotor axis of rotation and wherein said first row distance is smaller than said second row distance; wherein said first ring comprises a support part including a support face substantially facing said centre ring and including a back face substantially facing away from said centre ring; wherein said at least two separate rows of rolling elements are supported against said support face and wherein a contact surface part protrudes from said back face; wherein said contact surface part includes a contact face substantially facing in a general axial direction towards said rotor axis of rotation, wherein said contact face is fixed towards a corresponding hub contact surface, and wherein said contact face is arranged at a contact face distance from said rotor axis of rotation and wherein said first row distance is smaller than said contact face distance.