The cross roller bearings and a long cylindrical roller bearings are cylinder, the length Lw and diameter Dw ratio (Lw/Dw) greater than 3, the difference is the long cylindrical roller bearing roller diameter greater than 5 mm, and the needle taper roller bearing diameter less than 5 mm.
The basic structure of needle bearing is composed of a pair of rings, a group of needle, the outer ring belt guide rib and the oil hole.
Needle roller bearings because of its compact structure, small radial dimension, large load capacity, suitable for the radial profile of the limited size of components. The bearings can only bear radial load, can not bear the axial load. Its low speed limit.
The basic structure of cylindrical roller bearing consists of a ring, a retainer, a group ofcylindrical roller, is applicable to radial limited size, low speed components, can bear radial load. The installation does not allow the outer axis and the inner axis tilt.
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