NEEDLE BEARING

摘要

The needle bearing has a bearing ring. The bearing ring has a hardened austenitic steel with a total carbon and nitrogen content of from 0.8 to 1.2 percent by weight and needles which roll on a bearing surface of the bearing ring and are composed of a ceramic whose surface defects are smaller than 40 micro meter. The needles have silicon nitride, silicon oxide, alumina and zirconium oxide.