US 12,270,371 B2
Pitch system for a wind turbine blade
Lasse Godballe Andersen, Hjortshøj (DK); and Erik Garde, Randers SV (DK)
Assigned to Vestas Wind Systems A/S, Aarhus N. (DK)
Appl. No. 18/565,156
Filed by Vestas Wind Systems A/S, Aarhus N (DK)
PCT Filed Jun. 8, 2022, PCT No. PCT/DK2022/050122
§ 371(c)(1), (2) Date Nov. 29, 2023,
PCT Pub. No. WO2022/268277, PCT Pub. Date Dec. 29, 2022.
Claims priority of application No. PA 2021 70321 (DK), filed on Jun. 23, 2021.
Prior Publication US 2024/0271595 A1, Aug. 15, 2024
Int. Cl. F03D 1/06 (2006.01); F03D 7/02 (2006.01)
CPC F03D 1/0664 (2023.08) [F03D 7/0224 (2013.01); F05B 2260/507 (2013.01); F05B 2270/60 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A pitch actuator for a wind turbine pitch system, the pitch actuator having an actuator body and an actuator rod movable within the actuator body, the actuator rod including a drive end that is defined by a clevis fork arrangement having first fork member and a second fork member that extend in a direction along a rod axis (L) of the actuator rod and terminate at a tip end, wherein the first and the second fork members define respective clevis openings for receiving a clevis pin therethrough, said clevis openings each having an opening perimeter profile comprising:
a first perimeter section defined by a leading circular arc that is centered on the rod axis and oriented in the direction of the tip end of the fork members, the leading circular arc defining a nominal radius (R) and a central angle of less than 120 degrees, and
second and third flared perimeter sections that flank respective sides of the first perimeter section, each of which define an enlarged clearance zone with respect to at least part of a circle defined by the nominal radius of the first perimeter section.