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| Needle Roller Bearing |
| Sunday, January 25, 2009 |
Needle roller bearings are roller bearings with cylindrical rollers which are thin and long in relation to their diameter. ISO uses the definition that the roller length is 2,5 times the roller diameter or more. They are referred to as needle rollers. In spite of their low cross section the bearings have a high load carrying capacity and are thus extremely suitable for bearing arrangements where radial space is limited.
The SKF range of needle roller bearings is extensive and, in addition to customized designs, it comprises the following types:
– Needle roller and cage assemblies
– Drawn cup needle roller bearings
with open ends
and with closed end
– Needle roller bearings
with and without flanges
with
and without inner ring
– Sealed needle roller bearings
with
and without inner ring
– Alignment needle roller bearings
with
and without inner ring
– Combined needle roller bearings
*Needle roller/ball bearings
*Needle roller/thrust ball bearings
*Needle roller/cylindrical roller thrust bearings
Combined needle roller bearings consist of a radial needle roller bearing combined with a thrust bearing and are consequently able to take up both radial and axial loads. Combined needle roller bearings provide the means to produce locating bearing arrangements in a minimum of radial space. They are particularly useful where the axial loads are too heavy, speeds too high, or lubrication inadequate for simple thrust washers to be suitable, and other types of locating bearing take up too much room.
Combined needle roller bearings are available in the following designs:
– needle roller/angular contact ball bearings 
– needle roller/thrust ball bearings
– needle roller/cylindrical roller thrust bearings
–Needle roller thrust bearings Needle roller thrust bearings can support heavy axial loads, are insensitive to shock loads and provide stiff bearing arrangements which require a minimum of axial space. They are single direction bearings and can only accommodate axial loads acting in one direction. Particularly compact bearing arrangements can be made, taking up no more space than a conventional thrust washer, if the faces of adjacent machine components can serve as raceways for a needle roller and cage thrust assembly. For applications where adjacent components cannot serve as raceways, the assemblies can also be combined with washers of various designs.
Because of all the possible combinations, all bearing components must be ordered separately.
–Inner rings for needle roller bearings
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posted by Engineer @ 12:08 PM   |
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