Page 403 - Rollingbearings

Loads
Table 11
Axial loading of bearing arrangements incorporating two single row angular contact ball bearings and/or bearing pairs in tandem
Bearing arrangement Load case Axial loads

Back-to-back Case 1a
B A F rA ≥ F rB F = R F rA F = F + K a
aA
aB
aA
K ≥ 0
a
3
K a
F rB
F rA
Case 1b
Face-to-face
F < F rB F = R F rA F = F + K a
aA
aB
rA
aA
A B
K a ≥ R (F rB – F rA )
K a
F rB
F rA
Case 1c

rA
F < F rB F aA = F aB – K a F aB = R F rB
K < R (F – F )
a
rB
rA

Back-to-back Case 2a
B A F rA ≤ F rB F = F + K a F = R F rB
aA
aB
aB
K ≥ 0
a
K a
F rB
F rA
Case 2b
Face-to-face
F > F rB F = F + K a F = R F rB
aA
aB
aB
rA
A B
K a ≥ R (F rA – F rB )
K a
F rB
F rA
Case 2c
F rA > F rB F aA = R F rA F aB = F aA – K a

K < R (F – F )
rB
a
rA

For bearings with:
• 20° contact angle † R = 0,50
• 25° contact angle † R = 0,57
• 30° contact angle † R = 0,66
• 40° contact angle † R = 0,88

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