PowerPointPrsentation

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Lubrication Of Roller Bearings
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Roller Bearings have a long history
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Tasks of Roller Bearings
l reducing friction
l transfer of loads
l guiding rotating parts
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Friction
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Energy losses through friction
Although rolling friction is already very low,
manufacturers of roller bearings and lubricants
work continuously on further improvements..
µ 10 1/2 E AUSBRES
SKF one of the worlds biggest manufacturers of
roller bearings made the following calculation
If it can be managed to drop the friction in all
roller bearings installed on the globe only by
further 10, the combined total electricity
consumption of the countries Australia, Brasil,
Spain und Sweden could be cut to a half !
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Roller Bearings are named after the Shape of
their rolling Elements
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Friction in Roller Bearings
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Kinds of Lubricationof Roller Bearings
90 by greases
9,5 by oils
0,5 by solid lubricants only
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The most important Parameters for selecting the
suitable Lubricant
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DN- Factors for OKS Bearing Greases
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Temperature Range of OKS Bearing Greases
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Lubrication by greases
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Relubrication Intervals for Grease lubricated
Roller Bearings
Small bearings with lateral seals or cover plates
do not need any relubrication. They are already
for - life lubricated.
For all other roller bearings relubrication
intervals become valid.
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Guidelines forRelubrication Intervalls
Example A deep-groove ball bearing with an
internal diameter d 100mm running at a speed of
n 1000 rpm. The operating temperature lies
between 60 and 70 C. Which is the expected
relubrication interval? The vertical in point n
1000 rpm on the abscissa cuts the curve for d
100mm. From there the horizontal leads to the
outer left-hand scale (deep- groove ball
bearings) indicating a relubrication interval of
10000 service hours
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Correction of Relubrication Intervals
The assessed intervals are valid only for
l bearings in stationary machines l normal load l
ageing-proofed greases l temperature lt 70C at
the outer ring
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Dependance of Relubrication Intervals on
Tempearture
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Lubrication by Oil
is used at high speeds resp. at DN-factors
exceeding 1.000.000 and in case heat conduction
is necessary.
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Oil bath lubrication
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Oil injection lubrication
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Circulatory oil lubrication
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Lubrication with Solid Lubricants
Deep groove ball bearings with increased
clearance required at
l high temperatures gt 200 C l high
temperature variations l low speed
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Lubrication with Solid Lubricants - Exsample
Kiln-car bearings in the ceramics and brick
industry
Lubrication by Solid Lubricants only
at temperatures gt 200 C
OKS 230 MoS2-High Temperature Paste (for
thin-film lubrication during assembly and
maintenance)
in connection with
OKS 310 MoS2-High-Temperature Lubricant (for
relubrication during operation)
The carrying fluid evaporates residue-free above
200C and dry MoS2 films remain, which assure
lubrication up to 450C.
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OKS Speciality Lubricants forRoller Bearings at
l High loads
l Shock stress
l Vibrations
l Low or high speed
l Stop-and-go operation
l Very low or very high temperatures
l Temperature variations
l Humid conditions
l Corrosive influences
l Long-term lubricating needs
l Use in the food industry
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Thank You for Your Attention