Actuating drive for adjusting the pitch angle of a rotor blade of a wind turbine, and wind turbine comprising such an actuating drive

An actuating drive for adjusting a pitch angle of a rotor blade of a wind turbine having a roller bearing comprising:

• a first bearing ring and a second bearing ring rotatable with respect to one another, wherein the first and second bearing rings are supported with respect to one another by at least one radial roller bearing row;
• an actuator for rotating the first and second bearing rings with respect to one another;
• an annular groove cylinder formed in the first bearing ring, wherein the first bearing ring is divided into two ring sections along a plane extending perpendicular to an axis of rotation of the roller bearing, wherein the annular groove cylinder is formed in a region of the plane which passes through the annular groove cylinder;
• and
• at least one piston displaceably received in the annular groove cylinder and drive-wise connected to the second bearing ring, wherein the at least one radial roller bearing row is in a diameter region over which a driver extends that connects the at least one piston to the second bearing ring,
• wherein a static seal on a first side of the annular groove cylinder seals the two ring sections against each other, wherein a pair of sliding seals on a second side of the annular groove cylinder seal each of the two ring sections against the driver, wherein the driver has a disc shape and extends through a radially extending gap between the two ring sections, and wherein the two ring sections are axially tensioned towards each other such that the static seal and the pair of sliding seals work axially.

An actuating drive for adjusting a pitch angle of a rotor blade of a wind turbine having a roller bearing comprising:

• a first bearing ring and a second bearing ring rotatable with respect to one another, wherein the first and second bearing rings are supported with respect to one another by at least one radial roller bearing row;
• an actuator for rotating the first and second bearing rings with respect to one another;
• an annular groove cylinder formed in an annular nose of the first bearing ring;
• and
• a piston displaceably received in the annular groove cylinder and drive-wise connected to the second bearing ring, wherein the at least one radial roller bearing row is in a diameter region over which a driver extends that connects the piston to the second bearing ring,
• wherein the annular nose radially extends into an annular groove in the second bearing ring, wherein the first and second bearing rings are supported relative to each other by a pair of axial roller bearings arranged on opposite sides of the annular nose in a gap between the annular nose and the annular groove, wherein a radial bearing is in the gap between the annular nose and the annular groove, wherein the radial bearing is between the two axial roller bearings, and wherein the driver has a disc shape and radially extends out of the annular nose through a gap in the annular nose that opens towards the second bearing ring.