Needle roller bearings generally
consist of a pair of ring and a set of needle, the outer ring
with lead guard. It has compact structure, small radial size, large
load capacity, applicable to the limited size of the radial space
components, is also widely used under shaft or shell with
oscillating motion.
Generally only bear radial load, unable to bear axial load.
It has more types , with or without cage, one or two rows, with or
without lubrication groove and lubrication hole on outer ring, with
or without outer or inner ring, also can not take inner and outer
ring circle at the same time, only group needle.
