Needle roller bearings have a high radial load carrying capacity in addition to their small cross section size and good rigidity. They are especially suitable for bearing arrangements where radial space is limited. Because needle roller bearings carry pure radial load only and cannot limit the axial displacement of shaft and housing, it is important to ensure that inner ring axis and outer ring axis must be aligned during bearing mounting.
LEGEND standard needle roller bearing are type NA. They have single row and double row designs. Depending on applications, either single row or double row needle roller bearings can be made with inner ring (type NA) or without inner ring (type RNA). Constructive feature is that the bearing outer ring is provided with ribs or retaining snap rings at both sides, and inner ring is without ribs. Large-size needle roller bearings have an annular groove and a lubricating hole in outer ring. Outer ring, needle rollers and cage assembly of standard needle roller bearing are non-separable units. Besides types NA and RNA, LEGEND can provide full complement needle roller bearings (type RNAV) and cageless needle roller bearings (type NAV).
LEGEND can also provide long cylindrical roller bearings of type NAOL or NAL for customers. Operation feature of long cylindrical roller bearings is similar as that of needle roller bearings. For its cross section is larger than that of needle roller bearings, long cylindrical roller bearings are more suitable for heavy load applications.
Needle roller bearings have pressed steel cages or machined solid cages. Structure of cage will be determined by bearing applications.
Universal joint bearings, widely used in automobile and other machinery industry, are usually without inner ring. They can be divided into two designs, one with rubber seal and the other without rubber seal. Universal joint bearings without inner ring for automobile have three different structures, and they are types 7040/00, 8040/00 and 9040/00. Universal joint bearings of type 604000 or 604000RS are used for steel rolling machine, lifting & transportation machine, and other heavy machineries. As rings of this type of bearings are specially heat treated, they can carry heavier impact load. Universal joint bearings have thin section and take small space, so that the structures of universal joint crosses can be simplified and reduced.
Type: single row, double row, NA, RNA, NAV, RNAV, NAO, K, NAOL, NAL
Cage: pressed cage, solid cage, nylon cage