Page 588 - Rollingbearings

7 Needle roller bearings
Arrangements with Needle roller Needle roller bearings with a machined
components and other bearings with outer ring, without an inner ring
bearings • are an excellent choice for compact bear-
machined rings ing arrangements if the shaft can be hard-
• Generally, drawn cup needle roller bear- ened and ground (ig. 15)
ings run directly on a shaft. However, in SKF needle roller bearings with machined • enable a larger shaft diameter and a stiffer
applications where the shaft cannot be rings are made of carbon chromium bearing bearing arrangement compared to
hardened and ground, bearings should be steel SKF supplies these bearings with or arrangements with bearings with inner
combined with an inner ring (ig. 12, and without langes on the outer ring, in a wide rings
Needle roller bearing inner rings, range of series and sizes. SKF also supplies
page 593). them with or without an inner ring. Axial displacement of the shaft relative to the
• Drawn cup needle roller bearings with housing is only limited by the width of the
wide inner rings (ig. 12 and Needle roller Needle roller bearings with machined raceway on the shaft. By machining the shaft
bearing inner rings) provide an excellent inner and outer rings raceways to the appropriate dimensional
counterface for the lips of external G or SD • are used for applications where the shaft and geometrical tolerances, it is possible to
design seals (skf.com/seals). cannot be hardened and ground (ig. 14) obtain bearing arrangements with tighter
• Certain sizes of drawn cup needle roller • have limited permissible axial displace- geometrical tolerances. For additional infor-
bearings can be combined with a needle ment of the shaft relative to the housing mation, refer to Raceways on shafts and in
roller thrust bearing with a centring (ig. 3, page 583 and product table, housings, page 179.
lange, AXW series (ig. 13 and Needle page 636), which can be extended, if
roller thrust bearings, page 895), to needed, by using a wide inner ring (Needle
accommodate combined radial and axial roller bearing inner rings, page 593)
loads.

Fig. 12 Fig. 13
Drawn cup needle roller bearing Drawn cup needle roller bearing combined
with a needle roller thrust bearing
7

With a standard With a wide inner ring
inner ring and an external seal

Fig. 14 Fig. 15 Fig. 16
Needle roller bearing with machined rings Needle roller bearing with a machined Needle roller bearing with non-separable
outer ring closure rings

NK (F w ≤ 10 mm)

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