Special Bearings for Wind Power Generation
- Company Name:Sino Ceramics Co.,Ltd
- Membership:Free Member
- Member Since:2011. 04.11
- Country/Region:Taiwan
- City:Taiwan
- Contact:Chris
- Related Keywords:wind power, yaw bearing, pitch bearing, bearing
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Sino Ceramics Co.,Ltd
[Taiwan]
Kinds of special bearings for wind power generator
Usually, there are three kinds of special bearings, a yaw bearing, three pitch bearings and a set of transmission bearings (spindle and gearbox bearings) in a typical wind power generator. Sino Precision supplies yaw bearings and pitch bearings.
1. A yaw bearing is applied at the joint between the tower and the cockpit of the generator. Four contacting points slewing bearing and cylindrical crossed rollers slewing bearing usually are the candidates of yaw bearing.
2. A pitch bearing is applied at the joint between each blade and the hub. Single row and double rows four contacting points slewing bearing usually are the candidates of pitch bearing.
The concept of designing a special bearing for wind power generator
Generally, the life span of a wind power generator is not less than 20 years and its maintenance cost is not cheap. Thus, the service life of those special bearings for the generator is required for 20 years at least as well. But the working conditions of those special bearings are quite complicated when driven by wind. The bearings have to withstand both high impact and vibration very frequently. Therefore, a material with very high mechanical strength is required for these bearings, where alloy 42CrMo is adopted for the bearing ring. The hardness of the bearing ring is increased to 240 – 280 HB by integrate quenching and tempering treatment and the hardness of its race way is even improved to 55 – 62 HRC by particular surface quenching to ensure the impact deformation and the contacting fatigue will not occur during the required service life.
There are impacts as well in between gear and the gear of bearing ring. Thus a particular surface quenching is required on the gear of the bearing ring to ensure the low temperature impact resistance not less than 27J under —20℃ Akv. And this property is negotiable with customers.
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