Technical Requirements

  A material This standard specifies the yaw, pitchBearing test machine ring material selection 42CrMo, heat treatment with the overall quenching, after quenching hardness 229HB-269HB, part adopts raceway surface hardening, quenching hardness 55HRC-62HRC. As the wind turbine yaw, pitch bearing the force complex and bearings withstand shock and vibration is relatively large, therefore, requires both bearings to withstand impact, but also bear a greater load. Wind turbine host life requirements for 20 years, bearing the cost of installing a larger, thus requiring yaw, pitch bearing life have reached 20 years. Such matrix hardness of the bearing rings 229HB-269HB, able to withstand impact without plastically deformed portion while the raceway surface hardening hardness 55HRC-62HRC, contact fatigue life increases, so that the bearing long life requirements.