Abstract: A yaw brake for a wind turbine includes a brake housing disposed on one or both sides of a brake surface disposed about a yaw axis. The housing defines a bore and a piston is disposed within the bore. The piston is configured for movement within the bore along an axis between first and second positions in which the piston applies different braking forces to the brake surface. At least one portion of the piston and at least one portion of the bore of the brake housing have complementary non-circular shapes. The at least one portion of the piston is configured to be positioned within and least one portion of the bore when the piston is in the first and second positions. A bushing is disposed radially between the at least one portion of the piston and the at least one portion of the bore of the brake housing.

Abstract: A servicing system (30 or 300) for servicing a brake device (24) of a brake system comprising the brake device (24) and a brake disc (22) is described. The servicing system (30 or 300) includes a frame (32 or 302), and the servicing system (30 or 300) is further configured for mounting the frame (32 or 302) in a fixed position relative to the brake disc (22), supporting the brake device (24) to allow the brake device (24) to be moved on the frame (32 or 302) relative to the brake disc (22) and lifting the brake device (24) to allow the brake device (24) to be raised or lowered relative to the brake disc (22).

Abstract: The brake or coupling system (1) comprises a first piston (2) arranged in a first piston cylinder (3) thereby forming a first piston chamber (5) and a second piston (8) arranged in a second piston cylinder (9) thereby forming a second piston chamber (10). The first piston (2) is adapted to be displaced between a braking position and a rest position. The first piston (2) is spring biased in the direction of its rest position, and the second piston (8) is adapted to adjust a distance (X) provided between a friction element (6) and a rotatable element (7) in the rest position of the first piston (2) by means of adjustment of a volume of hydraulic fluid trapped in the second piston chamber (10). At least one spring element is arranged to act between the first and second pistons (2, 8).

Abstract: The present invention relates in particular, but not limited to, a wind turbine hydraulic brake calliper. The brake calliper comprising a cylinder bore, a piston having a piston head and a piston skirt. The piston being received in the cylinder bore in an orientation where the piston head faces towards the brake pad. The calliper comprising a fluid connection connected to or connectable to a source of hydraulic fluid for leading hydraulic fluid into the void of the cylinder bore below the piston head (1b), so as to move the piston. The piston is formed at least partly and preferably solely from a polymeric material or from polymeric materials.

Abstract: The invention relates to a brake device for braking a moving brake body (2) by means of pressing a brake element (3, 4) onto the brake body (2), wherein a conversion device (7) is provided for converting a rotational movement of a brake drive shaft (9) into a translational movement of the brake element (4) in the direction of the brake body (2), wherein a rotary percussion mechanism (8) is connected between the brake drive shaft (9) and the conversion device (7).

Abstract: The brake or coupling system (1) comprises a first piston (2) arranged in a first piston cylinder (3) thereby forming a first piston chamber (5) and a second piston (8) arranged in a second piston cylinder (9) thereby forming a second piston chamber (10). The first piston (2) is adapted to be displaced between a braking position and a rest position. The first piston (2) is spring biased in the direction of its rest position, and the second piston (8) is adapted to adjust a distance (X) provided between a friction element (6) and a rotatable element (7) in the rest position of the first piston (2) by means of adjustment of a volume of hydraulic fluid trapped in the second piston chamber (10). At least one spring element is arranged to act between the first and second pistons (2, 8).

Abstract: The invention relates to a brake device for braking a moving brake body (2) by means of pressing a brake element (3, 4) onto the brake body (2), wherein a conversion device (7) is provided for converting a rotational movement of a brake drive shaft (9) into a translational movement of the brake element (4) in the direction of the brake body (2), wherein a rotary percussion mechanism (8) is connected between the brake drive shaft (9) and the conversion device (7).

Abstract: A wind turbine rotor is decelerated and locked in a target rotational position in relation to rotation of the rotor about the rotor axis. The rotational position of the rotor in relation to the rotational axis is detected relative to at least one target rotational position. Once the rotor reaches one of the target rotational positions, the rotor is halted and automatically locked in the target rotational position.