Patent ID: 7789793

Claim:
A horizontal axis wind turbine, comprising: a vertically extending tower a rotatable long shaft within said tower; a bottom end of said long shaft having means to drive an electric generator; a top end of said long shaft connected to a power output gear means of a bearing tooth angle drive; said power output gear means engaged with a power input gear in said bearing tooth angle drive; and said power input gear being connected by drive shafts through a bearing tooth planetary gear drive to blades of a wind turbine for receiving power from said wind turbine and delivering torque to said long shaft for driving said generator; wherein said bearing tooth angle drive and bearing tooth planetary gear drive are contained within a nacelle; wherein said planetary gear drive comprises: an input shaft receiving drive power from said turbine blades and an output shaft for delivery of drive power to said bearing tooth angle drive; a rotating ring gear; planet gears connected through a carrier which do not rotate and are fixed; a sun gear connected to said output shaft; and each of said planet gears having arms each supporting a bearing tooth with a regular polygon periphery in which flat surfaces provide area contact with matching bearing teeth on said ring gear and said sun gear.