Herringbone spiral groove thrust bearings
Calculate required number of revolutions and friction losses
Load F
N
Bearing Diameter D=2R
10
-3
m
Film thickness h
0
(h
0
/R > 5·10
-5
)
10
-6
m
Viscosity
Pa·s
groove depth h
2
10
-6
m
λ=r
i
/r
o,
r
c
2
=(r
i
2
+r
o
2
)/2
groove angle α
deg.
number of grooves k
δ =h
0
/h
2
H
g
1
C
1
g
2
dimensionless load F
*
dimensionless friction
µ
*
angular velocity ω(F, h
0
)
rad/s
rotational velocity
rpm
friction coefficient
friction torque
N·m
power loss
Watt
www.tribology-abc.com