Thrust
Ball Bearings
Thrust
ball bearings are separable and their limit rotational speed is low.
Structures:
1.51000
type single-direction thrust ball bearings, this type of bearing can only
accommodate axial load on one direction and can control the axial movement on
one direction of the shaft and housing.
2.52000
type double-direction thrust ball bearings, this type of bearings can
accommodate axial load on double direction and can control the axial movement
on double direction of shaft and housing.
3.
560000 type thrust angular-contact Ball Bearing, as this structure can carry
axial load and radial simultaneously.
Cage materials
When
the outside diameter is equal or lesser than250mm, thrust ball bearings generally adopt pressed
steel sheet cages, when the outside diameter is more than250mm,it will adopt solid cages.
Minimum axial load
When
the Thrust Ball Bearing is operating, if the applied axial load is too small,
the axial direction is not tightly pressed, then acted by centrifugal force,
the steel ball will slip and displace and destroy the normal operation of the
bearings. To avoid the occurrence of such case, an axial load, Famin must be
applied when the thrust ball bearings is working. The calculating formula is:
In
the equation, Famin Minimum axial
load (kN)
A Minimum load constant
N Revolution (r/min)
Minimum
load constant A is showing in the bearings dimension table. If the applied
axial load is small, a spring must be used to preload the bearing.
Permissible tilt angle
The
double supporting surface of thrust ball bearings should be parallel. The axis
center line should be square with shell supporting surface, if this is not
assured, it can compensate by adopting spherical housing washer and
self-aligning washer.
Tolerance
The
tolerance value of thrust ball bearings is showing in the section [the
tolerance of rolling bearing".
Dynamic equivalent axial load
Whenα=90°,thrust
ball bearings can only carry axial load and its dynamic equivalent axial load
is: Pa=Fa
Whenα≠90, acted by constant and invariable radial and
axial loads, the dynamic equivalent axial load is: Pa=XFr+YFa
See
Annex Table 1 for the coefficients of X and Y.
Static equivalent axial load
Whenα=90°,
the static equivalent axial load is: P0a=Fa;
Whenα≠90°,
the static equivalent axial load is: P0a=2.3Frtanα+Fa.
Where:
For double-direction bearings, this equation is applicable to the status when
the ration of radial load and axial load is an arbitrary value; for
single-direction bearings, when Fr/Fa≤0.44ctgα, the
equation is reliable; when, the Fr/Fa＞0.67ctgα,
the equation can still give satisfactory P0avalue, but not very conservative.
Table 1 Value
of X and Y
α1)
Single-direction
Bearings2)
Double-direction
Bearings
e
X
Y
X
Y
X
Y
45º 3)
50º
55º
60º
65º
70º
75º
80º
85º
0.66
0.73
0.81
0.92
1.06
1.28
1.66
2.43
4.8
1
1.18
1.37
1.6
1.9
2.3
2.9
3.89
5.86
11.75
0.59
0.57
0.56
0.55
0.54
0.53
0.52
0.52
0.51
0.66
0.73
0.81
0.92
1.06
1.28
1.66
2.43
4.8
1
1.25
1.49
1.79
2.17
2.68
3.43
4.67
7.09
14.29
α≠90º
1.25tanα×
(1-
(1-
(1-
1.25tanα×
(1-
1.25tanα
Notes: 1)
For α`s medium value, use linear interpolation to calculate the values of X, Y
and e.
2) Fa/ Fr≤e is not
applicable to single-direction bearings.
3) For thrust bearings withα>45°, use interpolation method to calculate the
value of whenα=45°.
sinα)
tanα×
sinα)
tanα×
sinα)
sinα)
Thrust Ball Bearing
One Row Thrust Ball Bearing,Two Row Thrust Ball Bearing,Angular Contact Thrust Ball Bearing,Aligning Housing Ring Thrust Ball Bearing
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