NTN - Large Bearings

Bearing Tolerances
d
2
d1
d+ ∆dmp
2
d1+ d1+
∆dmp
∆d1mp
B
Theoretical tapered hole
B
Tapered hole having dimensional
difference of the average bore
diameter within the flat surface
Table 3.9 (3) Thrust bearings
rs min orr1 min 4
0.6
1
1.1
1.5
2
2.1
3
4
5
6
7.5
9.5
12
15
19
rs max orr1s max
Radial and axial direcition
1.5
2.2
2.7
3.5
4
4.5
5.5
6.5
8
10
12.5
15
18
21
25
Unit mm
4 These are the allowable minimum dimensions of the chamfer
dimension "r" or "r1" and are described in the dimensional table.
Table 3.10 (1) Tolerance and allowable values (Class 0) of
tapered bore of radial bearings
Unit m
d
∆dmp
Vdp 12
∆d1mp - ∆dmp
mm
over incl. high low high low max
80
120
180
250
315
400
500
630
800
1,000
1,250
120
180
250
315
400
500
630
800
1,000
1,250
1,600
+
+
+
+
+
+
54
63
72
81
89
97
+ 110
+ 125
+ 140
+ 165
+ 195
0
0
0
0
0
0
0
0
0
0
0
35
40
46
52
0
0
0
0
0
0
0
0
0
0
0
Table 3.10 (2) Allowable variations for radial bearing inner ring
tapered bores standard taper ratio 1:30 (Class 0)
Units m
80
120
180
250
315
400
500
120
180
250
315
400
500
630
+20
+25
+30
+35
+40
+45
+50
0
0
0
0
0
0
0
+
+
+
+
+
+
+
+
+
57
63
70
80
90
+ 105
+ 125
d
mm
∆dmp
∆d1mp ∆dmp
over incl. high low high low
+35
+40
+46
+52
+57
+63
+70
0
0
0
0
0
0
0
1 Applies to all radial flat planes of inner ring tapered bore.
2 Does not apply to diameter series 7 and 8.
Note: Quantifiers
1
For a standard taper ratio of 1:12d1dB 12
1
For a standard taper ratio of 1:30d1dB
∆d Dimensional difference of the average bore
diameter within the flat surface at the theoretical
small end of the tapered bore.
∆d1mpDimensional difference of the average bore
diameter within the flat surface at the theoretical
large end of the tapered bore.
VdpUnevenness of the bore diameter with the flat surface
B Nominal width of inner ring
Half of the tapered bore’s nominal taper angle
For a standard taper ratio of 1:122˚239.4
For a standard taper ratio of 1:300˚577.4
22
40
46
52
57
63
70
–
–
–
–
Vdp 12
max
22
40
46
52
57
63
70
A-21