K , NA , NKI , RNA , NK , HK , BK Type Of Needle Roller Bearings
A needle roller bearing is a bearing which uses small cylindrical
rollers. They are used to reduce friction of a rotating surface.
Needle bearings have a large surface area that is in contact with
the bearing outer surfaces compared to ball bearings. Additionally
there is less add clearance (difference between the diameter of the
shaft and the diameter of the bearing) so they are much more
compact. The typical structure consists of a needle cage which
orients and contains the needle rollers, the needle rollers
themselves, and an outer race (sometimes the housing itself).
Radial needle bearings are cylindrical and use rollers parallel to
the axis of the shaft. Thrust needle bearings are flat and use a
radial pattern of needles.
Needle roller bearings have a high load carrying capacity in
addition to their low cross-section and stiffness. They are
especially suitable for bearing arrangements where radial space is
limited. Because needle roller bearings only carry pure radial load
and cannot limit the axial displacement of shaft relative to the
housing. It is important to ensure that inner ring axis and outer
ring axis must be aligned during mounting the bearings.
Needle bearings are heavily used in automobile components such as
rocker arm pivots, pumps, compressors, and transmissions. The drive
shaft of a rear-wheel drive vehicle typically has at least eight
needle bearings (four in each U joint) and often more if it is
particularly long, or operates on steep slopes.
|HK||Drawn Cup needle Roller Bearing with Open Ends|
|HK……RS||Drawn Cup needle Roller Bearing with Open EndsSealed on One Side|
|HK……2RS||Drawn Cup needle Roller Bearing with Open Ends, Sealed on Both
|BK||Drawn Cup needle Roller Bearing with Close End|
|BK……RS||Drawn Cup needle Roller Bearing with Close End, Sealed on One Side|
|FFY||Drawn Cup Full Complement Needle Roller Bearing with Open End|
|MF……MFY||Drawn Cup Full Complement Needle Roller Bearing with Open End|