A. Types of LubricantsLubricants for pulley bearings are mainly of the following types:1. Lubricating oil:Liquid form: Widely used, with good fluidity and cooling properties.Performance characteristic...
RNA, NK-type needle roller bearings without inner rings. Since these bearings do not have an inner ring, they roll directly on the shaft surface during operation. Therefore, the surface hardness of the shaft is not less than HRC60, and the surface roughness is not more than 0.63Hm.