Needle roller and cage assemblies
SKF needle roller and cage assemblies are ready-to-mount, self-contained bearings. They are an excellent choice for applications that require a very rigid bearing arrangement as well as a high load carrying capacity. If the shaft and housing bore can serve as raceways, needle roller and cage assemblies require minimal radial space.
Basic design bearingsSKF basic design needle roller and cage assemblies are identified by the series designation K and available in single row (fig. 1, no designation suffix) and double row (fig. 2, designation suffix ZW) designs. They are characterized by the following properties:
- simple and rugged design
- accurate roller guidance in the cage pockets
- good running performance
Other needle roller and cage assembliesOn request, SKF also supplies needle roller and cage assemblies in other sizes or different designs.
Needle roller and cage assemblies with a split cage can be used where raceways are recessed in the shaft (fig. 3).
Special needle roller and cage assemblies for the gudgeon (wrist) pin (fig. 4) and crank pin (crankshaft journal) (fig. 5) for connecting rods of internal combustion engines and compressors, provide excellent service in spite of rapid accelerations, elevated temperatures, unfavourable load or poor lubrication conditions.
For additional information about special sizes and designs of needle roller and cage assemblies, contact the SKF application engineering service.
CagesDepending on their design, series and size, SKF needle roller and cage assemblies are fitted with one of the cages shown in table 1.
Double row needle roller and cage assemblies have a double row cage (fig. 2) in the same design as a single row cage.
The lubricants generally used for rolling bearings do not have a detrimental effect on cage properties. However, some synthetic oils and greases with a synthetic oil base and lubricants containing EP additives, when used at high temperatures, can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages and Cage materials.