Ball and Roller Bearings - Ntn-snr.com

Bearing Tolerances
d
2
d1
d+ ∆dmp
d1+ d1+
2
∆dmp
∆d1mp
B
Theoretical tapered hole
B
Tapered hole having dimensional
difference of the average bore
diameter within the flat surface
Table 6.10 (3) Thrust bearings
rs min orr1 min 4
0.05
0.08
0.1
0.15
0.2
0.3
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
0.1
0.16
0.2
0.3
0.5
0.8
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 6.11 (1) Tolerance and allowable values (Class 0) of
tapered hole of radial bearings
Unitm
d
∆dmp
Vdp
1 2
∆d1mp - ∆dmp
mm
over incl. high low high low max
10
18
30
50
80
120
180
250
315
400
500
10
18
30
50
80
120
180
250
315
400
500
630
+
+
+
+
+
+
+
+
+
22
27
33
39
46
54
63
72
81
+ 89
+ 97
+ 110
0
0
0
0
0
0
0
0
0
0
0
0
15
18
21
630 800 + 125 0 + 80 0
800 1,000 + 140 0 + 90 0
1,000 1,250 + 165 0 + 105 0
1,250 1,600 + 195 0 + 125 0
Table 6.11 (2) Allowable variations for radial bearing inner ring
tapered bores Standard taper ratio 1:30 (Class 0)
Units m
d
∆dmp ∆d1mp
∆dmp Vdp1 2
mm
over incl. over below over below max
50
80
120
180
250
315
400
500
80
120
180
250
315
400
500
630
+15
+20
+25
+30
+35
+40
+45
+50
0
0
0
0
0
0
0
0
+
+
+
+
+
+
+
+
+
+
+
+
25
30
35
40
46
52
57
63
70
+30
+35
+40
+46
+52
+57
+63
+70
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
9
11
13
16
19
22
40
46
52
57
63
70
19
22
40
46
52
57
63
70
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
30
∆d Dimensional difference of the average bore
diameter within the flat surface at the theoretical
small end of the tapered bore.
∆dDimensional difference of the average bore
diameter within the flat surface at the theoretical
large end of the tapered bore.
VdUnevenness 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 1:122239.4
For a standard taper ratio of 1:300577.4
A-45