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The radial play of bearings is specified as five groups as follows in accordance with Chinese National Standard
|
Bore diameterd(mm) |
Group2(C2) |
Standard group(C0) |
Group3(C3) |
Group4(C4) |
Group5(C5) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Over |
To |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
|
2.5 |
6 |
0 |
7 |
2 |
13 |
8 |
23 |
- |
- |
- |
- |
|
6 |
10 |
0 |
7 |
2 |
13 |
8 |
23 |
14 |
29 |
20 |
37 |
|
10 |
18 |
0 |
9 |
3 |
18 |
11 |
25 |
18 |
33 |
25 |
45 |
|
18 |
24 |
0 |
10 |
5 |
20 |
13 |
28 |
20 |
36 |
28 |
48 |
|
24 |
30 |
1 |
11 |
5 |
20 |
13 |
28 |
23 |
41 |
30 |
53 |
|
30 |
40 |
1 |
11 |
6 |
20 |
15 |
33 |
28 |
46 |
40 |
64 |
|
40 |
50 |
1 |
11 |
6 |
23 |
18 |
36 |
30 |
51 |
45 |
73 |
|
50 |
65 |
1 |
15 |
8 |
28 |
23 |
43 |
38 |
61 |
55 |
90 |
|
65 |
80 |
1 |
15 |
10 |
30 |
25 |
51 |
46 |
71 |
65 |
105 |
|
80 |
100 |
1 |
18 |
12 |
36 |
30 |
58 |
53 |
84 |
75 |
120 |
The size of the bearing clearance is directly related to the noise, vibration, temperature rise, service life and the mechanical movement effect of the bearing when it is in use. Therefore, it is very important to select the appropriate assembly bearing clearance. According to the range of radial clearance, it is divided into C2, CM, C0, C3, C4 and C5 from small to large. For details, please refer to the chart:
|
Occasions of use |
Examples of uses |
Select clearance |
|---|---|---|
|
Strict requirements for noise and vibration control, precise installation and high positioning |
Instruments, instrumentation equipment, electric motors, low noise, small motors |
C2, C0, CM |
|
General load, speed, and working temperature are not high |
General machinery such as transmission machinery and reducer |
C0 |
|
High temperature and high speed, high service life requirements |
Automotive generators, engines |
C3 |
|
Use depending on occasions where the ambient temperature is high and heat dissipation is not suitable |
Dryers, papermaking machinery, etc |
C3, C4 |
|
High temperature and high speed, large shock load |
vibratory screen,speed gear |
C4 |
|
When the inner and outer rings meet interference fits, large interference, high temperature and no heat dissipation |
Vibration road roller, locomotive rear wheel |
C5 |
In actual use, adjust the selected clearance according to the corresponding situation. The ideal working clearance should be close to zero clearance, so the load distribution state in the bearing is the best and the service life is the longest.
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