什么叫一类轴承

什么叫一类轴承0类轴承:深沟球轴承 deep groove ball bearing
1类轴承:调心球轴承 self aligning ball bearing
2类轴承:圆柱滚子轴承 cylindrical roller bearing
3类轴承:调心滚子轴承 self aligning roller bearing (球面滚子轴承)
4类轴承:滚针轴承 needle roller bearing
6类轴承:角接触球轴承 angular co