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Influence of an external axial load
Axial deflection graph for assembly Q16
Bearing 3
A
2
2
Bearings 1 and 2
Axial displacement (µm)
1
A
D
Assembly
When an axial load A is applied to the preloaded assembly,
bearings 1 and 2 support an extra load. Their inner rings
are displaced and bearing 3's inner ring is moved out and
no longer under load.
Axial load A leads to a displacement of inner rings δA.
When δA = δ2, bearing 3 is unloaded (separation) and the
preload is cancelled.
0 5 10 15 20 25 30 35 40 45 50 55 60 60
PE
Axial load (daN)
CD
Axial
load A
1
2
3
Preload
ring
Characteristic values
for equilibrium preload
PE and detachment
load CD
Characteristics
- Axial displacement: until preload is cancelled,
this is equal to δ2. With the initial approximation,
it is defined by the line OD. Beyond point D, the
curve represents the bearings supporting axial
load A: in the above examples, bearings 1 and 2.
- Axial rigidity: until the preload is cancelled,
mean rigidity is equal to CD/δ2.
- Detachment load CD: this is the axial load that
leads to the separation of the bearing(s) in
opposition: in the above example, bearing 3.
Assembly PE CD
DB - DF Pr 2.83 Pr
Q16 1.36 Pr 5.66 Pr
Q21 2 Pr 5.66 Pr
Pr: preload
Our engineers can send you the characteristic
curves for any assembly on request.
The axial and radial rigidity values for
preloaded bearings are given on page 44.
16