A lug forms an enclosure including a bottom surface defining an aperture that receives the projection of a sprocket, and a side surface defining an aperture that receives a retaining mechanism.

A rotatable industrial drum includes a rotatable drum with an outer peripheral surface, a plurality of elongated retention devices disposed parallel to one another along and secured to the outer peripheral surface, and a plurality of elongated wing assemblies disposed adjacent and retained by the retention devices. Each retention device includes at least one retention flange spaced from the outer peripheral surface of the drum and defining an elongated axially-extending retention chamber along a side of the respective elongated retention device. The elongated wing assembles includes an enlarged base from which a wing extends in a generally radial direction from the drum, the enlarged base extending laterally outward from either side of the wing being disposed within and between the elongated axially-extending retention chambers of at least two of the plurality of elongated retention devices disposed along either side of a respective elongated wing assembly.

A girth gear is provided, formed by a plurality of gear segments which are adapted to be secured together in an end to end arrangement to form the girth gear. Each gear segment includes a rim and a web extending from an underside of the rim. Each gear segment also includes at least one flange at each end of the gear segment for joining each gear segment together when the gear segments are in an end to end arrangement. The at least one flange has a side secured to one of the web or the rim.

A method for repairing a gear part (1) in a wind turbine, in particular repairing damaged teeth of a toothed rim (2). A repair cavity (10) is formed by removing material, including one or more damaged teeth, from the gear part (1) by drilling one or more holes through the gear part (1) along a direction which is substantially parallel to an axis of circular symmetry of the gear part (1). A repair segment (15) comprising one or more replacement gear teeth (16), and having a geometry which matches a geometry of the repair cavity (10), is arranged in the repair cavity (10), and attached to the gear part (1) by introducing one or more fasteners (17) into fastener openings (11, 13, 14) formed in the gear part (1).

A lug is configured to be attached to a projection of a sprocket using a retaining mechanism, the lug comprising an enclosure including a bottom surface defining an aperture configured to receive the projection, and a side surface defining an aperture configured to receive a retaining mechanism.

Rolling bearing (1) comprising an inner ring (3), an outer ring (2), at least one row of rolling elements which are arranged between raceways made on the rings (2, 3) and an ring gear (6) fixed to one of the rings (2). The ring gear (6) is formed of at least two independent gear segments (7, 8, 9, 10, 11, 12) which are each provided on their inner or outer peripheral surface with a plurality of meshing means (7b, 8b, 9b, 10b, 11b, 12b) and fixed only to one of either the inner or outer rings (3) of the rolling bearing (1), the circumference of the ring gear (6, 20) being substantially equal to the circumference of the combination of the independent gear segments.

A method of replacing at least one tooth of a gear includes providing a tool jig including a mounting block with a plurality of indexing jig features. The tool jig also includes a tool-supporting feature in laterally movable contact with a jig rail feature. With at least one indexing jig feature, relative motion of the tool jig relative to the gear is resisted. A material-removal tool is operated, while attached to the tool-supporting feature in the tooth-removal position, to remove at least a portion of a working circumference of the gear including a native gear tooth to be replaced. Motion of the material-removal tool is guided to generate a circumferential gear cut including a relatively smooth first cut surface formed by removal of at least the native gear tooth to be replaced. The material-removal tool is removed from the tool-supporting feature. The tool jig is removed from the gear.

A method of replacing at least one tooth of a gear includes providing a tool jig including a mounting block with a plurality of indexing jig features. The tool jig also includes a tool-supporting feature in laterally movable contact with a jig rail feature. With at least one indexing jig feature, relative motion of the tool jig relative to the gear is resisted. A material-removal tool is operated, while attached to the tool-supporting feature in the tooth-removal position, to remove at least a portion of a working circumference of the gear including a native gear tooth to be replaced. Motion of the material-removal tool is guided to generate a circumferential gear cut including a relatively smooth first cut surface formed by removal of at least the native gear tooth to be replaced. The material-removal tool is removed from the tool-supporting feature. The tool jig is removed from the gear.