| |
 |
TECHNICAL INFORMATION |
|
| Accuracy
Grade of Bearings |
| Accruacy
Grade Of Bearings |
C&U
bearings are manufactured according to the relevant specifications
of China's National Standards GB,which are equivalent
to ISO standards.
Comparison Table of Accuracy Grade
| Code
name |
Accuracy
grade
|
| GB |
0 |
6 |
5 |
4 |
2 |
| ISO |
0 |
6 |
5 |
4 |
2 |
| ANSI |
ABEC1 |
ABEC3 |
ABEC5 |
ABEC7 |
ABEC9 |
| SKF |
P0 |
P6 |
P5 |
P4 |
P2 |
| DIN |
P0 |
P6 |
P5 |
P4 |
P2 |
| JIS |
0 |
6 |
5 |
4 |
2 |
|
| Bearing
ring and rolling element materials |
High
carbon chrome bearing steel is a ageneral and normally
best material for bearing rings and rolling elements.
Their chemical composition given below:
Chemical composition of bearing steel GCr15
| element content
(wt%) |
C
0.95-1.05 |
Cr
1.40-1.65 |
Si
0.15-0.35 |
Mn
0.25--0.45 |
P
 0.027
|
S
0.002 |
| element content
(wt%) |
Ni
<0.23 |
Cu
0.25 |
Mo
0.1 |
Sn
<0.03 |
As
<0.04 |
Ti
<0.005 |
element content
(wt%) |
Sb
<0.002 |
Pb
<0.002 |
O
<0.0021 |
Al
<0.05 |
Ca
<0.01 |
|
Corresponding designation equivalent to GCr15
| China |
ISO |
USA |
Germany |
Japan |
Sweden |
| GCr15 |
683/XVII |
52100(ASTM) |
100Cr6(DIN) |
SVJ2(JIS) |
SKF3 |
|
 |
| Bearing
Clearance |
Bearing
interal clearance is defined as the total distance through
which one bearing ring can be moved relative to the other.
The operational clearance of a bearing has great influence
on the running condition,life,vibration level,noise value,and
thermal expansion of bearing.Following tables give the
clearance for the various bearing types in the conditions
of without preload.
Radial internal clearance of deep groove ball bearings(including
cylindrical bore):
|
Bore
d(mm) |
Clearance |
| C2 |
C0 |
C3 |
C4 |
C5 |
| over |
to |
min. |
max. |
min. |
max. |
min. |
max. |
min. |
max. |
min. |
max. |
| 6
10 |
10
18 |
0
0 |
7
9 |
2
3 |
13
18 |
8
11 |
23
25 |
14
18
|
29
33 |
20
25 |
37
45 |
18
24
30 |
24
30
40 |
0
1
1 |
10
11
11 |
5
5
6 |
20
20
20 |
13
13
15 |
28
28
33 |
20
23
28 |
36
41
46 |
28
30
40 |
48
53
64 |
10
50
65 |
50
65
80 |
1
1
1 |
11
15
15 |
6
8
10 |
23
28
30 |
18
23
25 |
36
43
51 |
30
38
46 |
51
61
71 |
45
55
65 |
73
90
105 |
80
100
120 |
100
120
140 |
1
2
2 |
18
20
23 |
12
15
18 |
36
41
48 |
30
36
41 |
58
66
81 |
53
61
71 |
84
97
114 |
75
90
105 |
120
140
160 |
Note:When measuring the clearance,we should take into
consideration of the extra clearance arisen from the measuring
load. |
|
| Lubricant
Types |
| CSR Code |
Brand Name |
Basic Type Grease |
Operating Temp.(degree) |
Uses |
| L06 |
Exxon Beacon325 |
Synthetic grease |
-55~120 |
General purpose grease |
| L01 |
Exxon
Andok B(Mil-G-18709 A) |
Channeling petroleum grease |
-30~95 |
Excellent high speed,low torque,light mass |
| L02 |
Exxon Andok C |
Channeling petroleum grease |
-30~120 |
Smooth running,long life |
| L80 |
G.E. Versilube G300 |
Silicone grease |
-75~205 |
Light loads and fine moderate speed |
| L60 |
Mobil 28(Mil-G-81322) |
Synthetic hydrocarbon |
-55~180 |
Wide temperature range,good low temperature torque |
| L19 |
Chevron SRI-2 |
Mineral grease |
-30~180 |
High temperature stability with good water resistance |
| L15 |
Shell Alvania 2 |
Mineral grease |
-35~120 |
Long life and wide application |
| L76 |
DuPon Krytox
240AC(mil-G-2761) |
Fluorinated grease |
-35~290 |
High temperature stability with good lubricity
properties |
| L31 |
Shell Dolium R |
Petroleum grease |
-40~150 |
Good corrosion resistance and water resistance |
| L21 |
KYODO |
Synthetic grease |
-40~150 |
Low noise,low torque and special case |
| L91 |
NIG-ACE W |
Synthetic grease |
-18~150 |
Low noise,low torque and special case |
| L63 |
Mobil HP |
Lithium comples |
-30~110 |
vibration,moderate speeds and good corrosion resistance |
| L08 |
Motor No.2 |
Mineral grease |
-30~110 |
Wide application, general purpose |
|
Characteristics of Sealing
 |
ZZ |
2RS |
2RSL |
| Low
friction torque |
excellent
A |
excellent
A |
good B |
| High
speed |
excellent
A |
excellent
A |
good B |
| Grease
seal |
good B |
excellent
A |
best excellent
AA |
| dustproof |
good B |
excellent
A |
best excellent
AA |
| waterproof |
bad C |
good B |
excellent
A |
|
AA:utmost
excellent
A:excellent
B:good
C:bad |
|
|
|
| |
|
