3_1_32

Calculation of equivalent radial / axial load

Bearing type

Dynamic equivalent radial load

Static equivalent radial load

Deep groove ball bearings

P_r=XF_r+YF_a

f₀F_a/C_0r	e	F_a/F_re		F_a/F_re
f₀F_a/C_0r	e	X	Y	X	Y
0.172	0.19	1	0	0.56	2.30
0.345	0.22				1.99
0.689	0.26				1.71
1.03	0.28				1.55
1.38	0.30				1.45
2.07	0.34				1.31
3.45	0.38				1.15
5.17	0.42				1.04
6.89	0.44				1

Factor f₀ is shown in the bearing dimension table.

P_0r=0.6F_r+0.5F_a

when P_0rF_r ; P_0r=F_r

Angular contact ball bearings

Single-row angular contact ball bearings

P_r=XF_r+YF_a

Contact
angle

if₀F_a/C_0r

Single-row and tandem arrangement

Back-to-back and face-to-face arrangement

F_a/F_r

=15

0.178
0.357
0.714

1.07
1.43
2.14

3.57
5.35
5.35

0.38
0.40
0.43

0.46
0.47
0.50

0.55
0.56
0.56

0.44

1.47
1.40
1.30

1.23
1.19
1.12

1.02
1.00
1.00

1.65
1.57
1.46

1.38
1.34
1.26

1.14
1.12
1.12

0.72

2.39
2.28
2.11

2.00
1.93
1.82

1.66
1.63
1.63

=30

0.8

0.39

0.76

0.78

0.63

1.24

=40

1.14

0.35

0.57

0.55

0.57

0.93

For i, use 2 for DB & DT arrangements and 1 for single & DT arrangement.

Factor f₀ is shown in the bearing dimension table.

P_0r=X₀F_r+Y₀F_a

In reference to single-row or tandem arrangement bearings,
when P_0r

F_r; P_0r=F_r

Contact angle	Single-row and tandem arrangementt		Back-to-back and face-to-face arrangement
Contact angle	X₀	Y₀	X₀	Y₀
=15	0.5	0.46	1	0.92
=30	0.5	0.33	1	0.66
=40	0.5	0.26	1	0.52

Double-row angular contact ball bearings

P_r=XF_r+YF_a

Contact angle	e	F_a/F_re		F_a/F_re
Contact angle	e	X	Y	X	Y
=24	0.66	1	0.95	0.68	1.45
=32	0.86	1	0.73	0.62	1.17

P_0r=X₀F_r+Y₀F_a

Contact angle	X₀	Y₀
=24	1	0.78
=32	1	0.63

Self-aligning ball bearings

P_r=XF_r+YF_a

F_a/F_re		F_a/F_re
X	Y	X	Y
1	Y₁	0.65	Y₂

Refer to the bearing specification table for values of e, Y_1, Y₂

P_0r=F_r+Y₀F_a

Refer to the bearing specification table for value of Y_0.

Cylindrical roller bearings

P_r=F_r

P_0r=F_r

Tapered roller bearings

Single-row tapered roller bearings

when F_a/F_re ; P_r=F_r

when F_a/F_re ; P_r=0.4F_r+Y₁F_a

Refer to the bearing specification table
for the values of axial load factors Y₁ and constant e.

P_0r=0.5F_r+Y₀F_a
when P_0rF_r ; P_0r=F_r

P_0r=F_r

Refer to the bearing specification table for the value of axial load factors Y_0.

Double-row / four-row tapered roller bearings

when F_a/F_re ; P_r=F_r+Y₂F_a

when F_a/F_re ; P_r=0.67F_r+Y₃F_a

Refer to the bearing specification table
for the values of axial load factors Y_2, Y₃ and constant e.

P_0r=F_r+Y₀F_a

Refer to the bearing specification table for the value of axial load factors Y_0.

Spherical roller bearings

when F_a/F_re ; P_r=F_r+Y₁F_a

when F_a/F_re ; P_r=0.67F_r+Y₂F_a

Refer to the bearing specification table
for the values of axial load factors Y_1, Y₂ and constant e.

P_0r=F_r+Y₀F_a

Refer to the bearing specification table for the values of axial load factors Y₀ and constant e.

Needle roller bearings

P_r=F_r

P_0r=F_r

Thrust ball bearings

Dynamic equivalent axial load

P_a=F_a

Static equivalent axial load

P_0a=F_a

Spherical thrust roller bearings

Dynamic equivalent radial load

P_a=1.2F_r+F_a

Static equivalent axial load

P_0a2.7F_r+F_a

Note : F_r/F_a0.55