A wind turbine has a main shaft line with a main shaft, a rotor hub, and a rotor lock plate having an opening for receiving a pin, and a nacelle having a bed plate. A multi-part main bearing has a housing, an inner ring, and an outer ring. A pin is moveable between a first, second, and third position, and is retracted from the opening in the first position so that the main shaft line is rotatable. The pin is inserted into the opening in the second position so that the main shaft line is not rotatable. In the third position, the pin is shifted and the main shaft line is supported by the pin such that the weight of shaft and loads on the main shaft are not transmitted through the multi-part main bearing but are transferred via the rotor lock plate and the pin to the bed plate.

A monitoring system for monitoring a time period of a locking state of a rotor of a wind turbine includes at least one motion sensor and at least one computing unit, wherein the computing unit is confiugered to receive at least one motion measurement from the at least one motion sensor and wherein the computing unit is configured to determine whether the rotor may remain in the locking state or the rotor should be unlocked based on the at least one motion measurement. A wind turbine having the monitoring system and a method for monitoring a time period of locking state of a rotor of a wind turbine is also provided.

A mechanism for restraining movement of a locking pin is disclosed. The mechanism includes a plurality of bushings 1. At least one of the plurality of bushings is provided in an aperture 76, 78 and on either ends of the locking pin 74. Further, at least one primary restraining mechanism 7 is configured in the at least one bushing 1 at one end of the locking pin 74, where the primary restraining mechanism 7 is fixedly connected to the at least one bushing 1 and is configured to restrain at least one of sliding and rotary movement of the locking pin 74.

A turner gear arrangement (60) for turning a rotor of a wind turbine via a drivetrain thereof; said turner gear arrangement (60) comprising a motor (68), a torque transmission assembly (90), and a mounting assembly (80); said torque transmission assembly (90) comprising one or more rotational elements and including a turner output drive (92) rotating about an axis (R), said turner output drive (92) being operably coupled to and driven by said motor (68) and configured to transmit rotational motion to a gearbox output shaft of a said drivetrain, said turner output drive (92) further including an output guide portion (94); said mounting assembly (80) being configured to mount said motor (68) and said transmission assembly (90) in a fixed relation with respect to a wind turbine drivetrain; and wherein said mounting assembly (80) further includes a radial support interface (86) which operably engages with said output guide portion (94), to constrain movement of said turner output drive (92) in a direction transverse to its rotational axis (R). Also a wind turbine drivetrain arrangement, comprising a drivetrain (20) including a rotor shaft (26) fixable to a wind turbine rotor hub (8), a gearbox (22) and a drivetrain housing, wherein the rotor shaft (26) is coupled to the gearbox (22) at a gearbox input coupling, and wherein the gearbox (22) includes an output drive shaft (38) defining a rotational axis (R); the drivetrain arrangement further comprising a turner gear (60)

A lock for preventing rotation of a rotor of a wind turbine has a rotatable lock pin, a pin support supportable in a nacelle of the wind turbine and a mechanism for rotating the lock pin. The pin support has a hub-facing face proximate a rotor hub. The rotatable lock pin is rotatably mounted on the pin support. The lock pin has a cammed portion extending away from the hub-facing face toward the hub. The lock pin inserted into a complementary rotor lock aperture on the rotor hub when the pin support is supported in the nacelle. Rotation of the lock pin causes engagement of an exterior surface of the cammed portion with an interior surface of the rotor lock aperture to immobilize the lock pin against the interior surface to prevent relative motion between the lock pin and the aperture to prevent rotation of the rotor.

A rotor lock assembly for locking a rotor of a wind turbine includes at least one removable rotor lock. The removable rotor lock has a housing comprising an opening and a mounting portion, a pin shaft positioned within the opening, and a locking mechanism. The opening extends from a first end to a second end thereof. The mounting portion is adapted for mounting to a bearing housing adjacent to a rotor lock plate of the rotor.

A generator (24) for a wind turbine (1) comprises a rotor (32) with an axis of rotation, a stator and a radial and/or axial locking mechanism. The radial locking mechanism comprises a plurality of radial locks (60) with a fixed portion (70) coupled to the stator and a movable elongate portion (72) configured to move relative to the fixed portion (70) and radially with respect to the axis of the rotation to lock the stator in a radial direction. The rotor (32) may comprise at least one lock engagement feature (86) arranged at its end surface and an end shield (90) located axially outward and at least partially adjacent the end surface. The end shield (90) comprises at least one opening enabling access to the end surface of the rotor (32). The axial locking mechanism may comprise at least one axial lock (80) comprising a removable block (82) configured to partly cover the at least one opening of the end shield (90) and a rotor engagement tool (84) for engaging the removable block (82) with the at least one lock engagement feature (86).

Rotor restraining apparatus (200) and methods for a wind turbine (1) are disclosed. A rotor restraining apparatus has a locking element (204) associated with a rotor (8, 203) of the wind turbine, a rotational axis of said rotor defining an axial direction, the locking element being at least part-circular in form. The locking element comprises a plurality of engagement formations (205) disposed on a periphery thereof. The apparatus also has a restraining member (206), comprising a plurality of engagement formations (207). The restraining member is movable substantially along said axial direction between: (a) a non-restraining position; and (b) a restraining position in which the restraining member engagement formations are able to engage the locking element engagement formations. At least a portion of the restraining member has an arcuate form that substantially matches the curvature (A) of the locking element.

Provided is a rotor locking system for a rotor hub of a wind driven power plant, including a rotor locking disk, a rotor locking pin unit, and a rotor locking pin, wherein the rotor locking disk is mounted to the rotor hub, wherein the rotor locking pin is an actuated element of the rotor locking pin unit, wherein the rotor locking pin is configured to assume a first position The rotor locking pin is configured to assume a second position in which the rotor locking pin extends into a recess of the rotor locking disk such that a rotation of the rotor hub is preventable, and wherein the rotor locking pin is lockable.

An assembly (127) for a wind turbine (100) comprises a housing (126), the housing comprising a first bearing (150) and a second bearing (154). A shaft (142) extends axially within the housing (126) and is supported by the first bearing (150) and the second bearing (154) for rotation relative to the housing (126). A radially outer portion of the shaft (142) comprises at least one shaft engagement formation (146) positioned between the first bearing (150) and the second bearing (154). A retention mechanism (156) is moveable axially between: an engaged position in which it can engage the shaft engagement formation (146), such that rotation of the shaft (142) is constrained; and a disengaged position in which the retention mechanism (156) cannot engage the shaft engagement formation (146), thereby allowing rotation of the shaft (142). A method of operating such an assembly is also described.