1)Materials for ringsand rolling elements
While the contact surfaces between thebearing rings and rolling elements are subjected torepeated heavy stress,theymust still maintain high rotational precission,therefore, the materials used forbearings rings and rolling elements require the followingcharacteristics:
●High rolling contact fatigue strength
●Highhardness
●High wear resistance
●High dimension alstability
●Highmechanical strength
The material used by our company is high carbonchromium bearings steel GCr15-GB/T18254 equivalent such as AISI 52100(USA),DIN100Cr6(Germany) JISSUJ2(Japan) and BS534A99(UK).
2)Materialsfor cages
The materials for cages must have strength towithstandrotation at load and shock load. Low frictional efficiency light weight andbe able to with stand operation temperature.
The material used in ribboncagesor crown cages is 08F or SPCC pressed.
It is chemical compositionis shown for extra-high speed application. Plastic cages such as glassreinforced poly mideareused.
These plastic crown have the advantages oflow torque,long grease lefe and low noise,etc.
3)Vibration and noise
●Themeasuring parameter of vibration adopted by RNB is the vibration acceleration ofvibration velocity.
● The measuring units and measuring method arespecified by JB/T5314 and JB/T5313 In the process of measuring vibrationstrictly controlled noise by using acoustics.
4)Internalclearance
Single row deep groove ball bearings are manufacturedwith Normal radial internal clearanceas standard. Most of the bearings are alsoavailable with C3 radial internal clearance. Some of the bearings can also besupplied with as maller C2 clearance or the much greater C4 or C5 clearances. Inaddition, deep groove ball bearings are available with reduced or displacedinternal clearance ranges. These special clearances may use reduced ranges ofstandard clearance classes orpartitions of adjacent classes, see designationsuffix CN in section.
5)Tolerances
Single rowdeep groove ball bearings are manufactured as standard tonormaltolerances.
Single row deep groove ball bearingsare produced to higher precision than the ISO Normal tolerances. Thedimensional accuracy corresponds to P6 tolerances, expect the width tolerance,which is considerably tighter andreduced to
-0/–60μmfor bearings withoutside diameter up to 110 mm
-0/–100 μm forlargerbearings.
Therunning accuracy depend on the bearing size andcorrespondsto
- P5tolerances for bearings up to a 52mm outsidediameter
- P6 tolerances forbearings above 52 mm up to 110 mm out side diameter
- Normal tolerances forlarger bearings.
For bearing arrangements where accuracy is a keyoperational factor, some SKF single row deep groove ball bearings are alsoavailable with accuracy completely to P6 or P5 tolerance classs pecifications.The availability of these bearings should always be checked beforeordering.
Deep groove ball bearings
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