Calculating the permissible axial displacement

Limited by the displacement of the roller set
Limited by the reduction of internal clearance
When the bearing rings are not misaligned, the axial displacement is limited by the values s1 or s2 (fig. 1 and fig. 2).The axial displacement for a maximum clearance reduction can be estimated using:



When the bearing rings are misaligned, the axial displacement values s1 or s2 must be reduced:

srol = s1 – k1 B α

or

srol = s2 – k1 B α

The clearance reduction caused by a certain axial displacement can be estimated using:


Calculation example 1
What is the maximum axial displacement the roller set permits for a C 3052 bearing when the bearing rings are misaligned by α = 0,3°?

srol = s1 – k1 B α

srol = 19,3 – 0,122 x 104 x 0,3
      = 15,5 mm
Calculation example 2
What is the maximum axial displacement for a C 3052 bearing if a maximum internal clearance reduction of 0,15 mm is permitted?





See also diagram 1.
Calculation example 3
What internal clearance reduction does an axial displacement from the central position of 6,5 mm cause in a C 3052 bearing?





See also diagram 1.
Bearing data for calculation examples
Bearing C 3052
B  = 104 mm
s1 = 19,3 mm
k1 = 0,122
k2 = 0,096

Symbols

B
bearing width [mm]
Cred
reduction of radial clearance as a result of an axial displacement from a centred position [mm]
k1
misalignment factor (→ product tables)
k2
operating clearance factor (→ product tables)
s1axial displacement limit in bearings with a cage or in full complement bearings when displacing away from the retaining ring [mm] (→ product tables)
s2
axial displacement limit in sealed and full complement bearings when displacing toward the seal or retaining ring respectively [mm] (→ product tables)
sclemaximum axial displacement from a centred position, corresponding to a certain radial clearance reduction [mm]
srol
maximum axial displacement limited by the roller set, including misalignment effect [mm]
αmisalignment [°]
SKF logo