Wind turbine bearings can be divided into three categories, namely: yaw bearings, pitch bearings, transmission bearings (main shaft and gearbox bearings). Yaw bearings installed in the tower’s junction with the cockpit, pitch bearings installed in each blade root and hub joints. Each wind turbine equipment bearings and a set of three pitch yaw bearing (part of the megawatt-class wind power generator for the following non-adjustable blades, can not pitch bearing).
A code method
Wind turbine yaw, pitch bearings, code-named methods used JB/T10471-2004 method in the code wheel bearing, but in wind turbine yaw, pitch bearings double row appears in four point contact ball wheel bearings This structure bearing the code is not provided in JB/T10471-2004, therefore, an increase of double the standard four-point contact ball bearing turntable code. As the single-row four point contact ball bearing turntable with a 01 structure type code that, while the structure type code 02 that is double reducer ball turntable bearing structure, so that the provisions of 03-row four point contact ball bearing turntable structure.
2 Technical Requirements
2.1 Materials
This standard provides yaw, pitch bearing ring of material selection 42CrMo, treatment with the overall quenching, after quenching hardness 229HB-269HB, part roller surface quenching, quenching hardness of 55HRC-62HRC. As the wind turbine yaw, pitch bearings complicated by force, and bearing to withstand the shock and vibration relatively large, therefore, required to withstand the impact of both bearing and can withstand a greater load. Host life requirements wind turbines 20 years, bearing the cost of installation, so the required yaw, pitch bearing life have reached 20 years. Bearing this matrix hardness 229HB-269HB, able to withstand the impact without the risk of plastic deformation, while parts of the surface roller quenching hardness reached 55HRC-62HRC, increase the contact fatigue life, in order to ensure long bearing life requirements.
Low-temperature impact energy of 2.2
The standard yaw, pitch wheel bearing rings at low temperature impact energy requirements: -20 ℃ Akv not less than 27J, cold under the Akv value can be determined in consultation with users. Wind generators may work in very cold areas, the ambient temperature is about as low as -40 bar, bearing the working temperature is about -20 ~ C, bearing at low temperature must be able to withstand large impact load, therefore, required bearing rings The material in the quenched and low temperature impact energy tests must be done, taking on the part of the bearing rings made of sample or the same performance and with rings under the same conditions of sample treatment, in the -20 ~ C environment do impact function test.
2.3 Bearing Gear
As the wind generators bearing drive accuracy is not high, and the larger ring gear diameter, gear modulus larger, and consequently, the accuracy of the general level of gear required by GB/T10095.2—2001 of 9 or 10. However, due to work under the pinion and ring gear bearings between the impact, therefore, bearing ring gear tooth surface should be hardened, small gear tooth surface hardness generally 60HRC, taking into account other life design, a large gear tooth surface quenching hardness requirements not be less than 45HRC.
Three types of wind turbine bearings introduction of new standards
Tags: wind turbine
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