Wind turbine main rotor turning systems

Abstract

A turner gear arrangement () for turning a rotor of a wind turbine via a drivetrain thereof; said turner gear arrangement () comprising a motor (), a torque transmission assembly (), and a mounting assembly (); said torque transmission assembly () comprising one or more rotational elements and including a turner output drive () rotating about an axis (R), said turner output drive () being operably coupled to and driven by said motor () and configured to transmit rotational motion to a gearbox output shaft of a said drivetrain, said turner output drive () further including an output guide portion (); said mounting assembly () being configured to mount said motor () and said transmission assembly () in a fixed relation with respect to a wind turbine drivetrain; and wherein said mounting assembly () further includes a radial support interface () which operably engages with said output guide portion (), to constrain movement of said turner output drive () in a direction transverse to its rotational axis (R). Also a wind turbine drivetrain arrangement, comprising a drivetrain () including a rotor shaft () fixable to a wind turbine rotor hub (), a gearbox () and a drivetrain housing, wherein the rotor shaft () is coupled to the gearbox () at a gearbox input coupling, and wherein the gearbox () includes an output drive shaft () defining a rotational axis (R); the drivetrain arrangement further comprising a turner gear ().