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Bearing Grease-v1

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Calculation for Amount of Grease for a Bearing
February 24, 2014
All units are in grams and centimeters.
Bearing OD = A
Bearing ID = B
Bearing HT = H
Volume of bearing (solid) = Vbearing
Mass of bearing (solid) = Mbearing
Mass of bearing (measured) = mbearing
Volume of ’free space’ = Vf ree
% of ’free’ for grease = %G
Volume of grease = Vgrease
Mass of grease = Mgrease
Density of steel (ρS ) = 8 grams/cm3
Density of grease (ρG ) = 0.9 grams/cm3
VA
= πH · A2 /4
VB
= πH · B 2 /4
= VA − VB
Vbearing
Mbearing
Vf ree
Vf ree
Vgrease
Mgrease
Vgrease
Mgrease
= ρS · Vbearing
= (Mbearing − mbearing )/ρS
mbearing
= Vbearing −
ρS
= %G · Vf ree /100
= ρG · Vgrease
[
mbearing ]
= %G · 0.7854 · H(A2 − B 2 ) −
8
[
mbearing ]
2
2
= 0.9 · %G · 0.7854 · H(A − B ) −
8
1
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