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剪纸 艺术新闻 武林英雄 剪纸图片 国画
剪纸 艺术新闻 武林英雄 剪纸图片 国画
剪纸 艺术新闻 武林英雄 剪纸图片 国画
剪纸 艺术新闻 武林英雄 剪纸图片 国画
剪纸 艺术新闻 武林英雄 剪纸图片 国画
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Technical Information >> Technical Information  

Technical Information


1. BEARING MATERIALS:

   Ring and Rolling Element s material:    Primarily, is used for the bearing rings and rolling elements. This bearing steel is heat treated by Vacuum quench.The general feature of the steels is highly purified, high hardness, anti-fatigue, anti-grinded,and the stability of the dimension.                      
      The standard material for ZL bearing rings, rollers and balls is vacuum-processed high carbon chromium steel allowing high quality consitency and long bearing service life. Material symbol is GCr15, which from Baogang Steel and Xingcheng Steel and its chemical composition is approximately the same as AISI 52100 specified in the USA, DIN 100 Cr6 in Germany, and BS 535A99 in England.

   Cage material:      The are mainly used for pressed cages of bearings. Depending on the purpose, brass, stainless steel or may be used. For machined cages, or carbon steel is used.

CHEMICAL COMPOSITION OF BEARING STEEL

Steel No.

Symbol

Chemical Composition (Wt%)

Gcr15

AISI 52100

C
0.95-1.05

Cr
1.30-1.65

Si
0.15-0.35

Mn
0.2-0.4

P
<0.027

S
<0.02


THE COMPARISON TABLE FOR EACH STANDARD

China

ISO

USA

Japan

Germany

France

Sweden

GB

 

AISI

JIS

DIN

NF

 

Gcr15

683/xv11

52100

SUJ2

100Cr6

100C6

SKF3

一、TAPERED ROLLER BEARING

(1)The rings and rollers of ZL bearings are made of refined high carbon-chrome bearing steel-GCr15. (The contrast of Bearing Steel No. of each country) The cages are punch-pressed from super quality cold rolling steel sheet or having nylon cages. The seals are hot-pressed from oil-resistant bune-N rubber with phosphatizing steel skeleton. (2)Case hardened steel, pls kindly contact us for more information.

PRECISION

      The precision of inch system bearing is classified in 4, 3, 2, 0 and 00 five grades Classes. 0,6/6X,5 and 4 apply to metric-system bearings.
The relationship of classes to ISO tolerance classes, etc.

Series

Standard

Bearing Class Designations

Inch

ANSI/ABMA std.19.2

4

2

3

0

00

Metric

GB/T307.1

0

6X

5

4

  2

ISO492

0

6X

5

4

  2

ANSI/ABMA std.19.1

K

N

C

B

A

DIN 620

0

6X

5

4

  2

JISB1514

0

6X

5

4

  2

CLEARANCE                                                                                                                                                              

        The radial clearances of tapered bearings are divided into six groups as shown.            

Bore diameter (mm)

Group 1

Group 2

Normal

Group 3

Group 4

Group 5

Over

to

min

max

min

max

min

max

min

max

min

max

min

max

-

30

0

10

10

20

20

30

40

50

50

60

70

80

30

40

0

12

12

25

25

40

45

60

60

75

80

95

40

50

0

15

15

30

30

45

50

65

65

80

90

110

50

65

0

15

15

30

30

50

50

70

70

90

90

120

65

80

0

20

20

40

40

60

60

80

80

110

110

150

80

100

0

20

20

45

45

70

70

100

100

130

130

170

    Special radial clearance or axial clearance requirement could be made as specified in orders.


LUBRICATION

      The main purposes of bearing lubrication are to prevent metallic contact between the rolling elements, raceways, and cage, and also to prevent the bearing from corrosion and wear. Additional functions are sealing and cooling of the bearing.
      Bearing may be lubricated with grease or oil-in special cases with a solid lubricant-the choice of which depends primarily on the temperature range, operating speeds, and loading conditions of the bearings concerned.
      All lubricants must be changed from time to time because their properties deteriorate as a result of aging and contamination of the lubricants.
      The limiting speeds for both grease and oil lubrication are given

Title

No.

Average Drops

Working 25(77oF)

Working T.

Remarks

1.  Shell

Alvania R Grease

R2

185(365)

265-295

-30~120

Lithium Grease

R3

185(365)

220-250

-30~120

Alvania EP Grease

EP1

180(356)

310-340

 

Lithium EP Grease

EP2

185(365)

265-295

-25~110

2.  Mobil oil

Mobil Grease

22

192?378?

274

-40~120

 

EP2

190(374)

280

-25~110

3.  Esso

Andok

C

260(500)

190-210

-30~150

 

Beacon

325

190(374)

280

-55~120

 

二、BALL BEARING

CAGES
In general, ZL cages are pressed steel ribbon cages & pressed steel snap cages. For wheel hub bearings and A/C beairngs, the cages are made from Nylon 66 with glass fiber.


SHIELDS & SEALS
The standard seals are made of oil and wear-resistant nitrile rubber(NBR) with a sheet steel reinforcement. SPCC is the standard material for shields we apply.


LUBRICATION
The grease can be applied upon customer's requirements. In general, Alvania R 2 is used for FKG small ball bearing. RONEX MP from ESSO Co. and ALVANIA R3 from SHELL are used for wheel hub bearings.
Details as per our grease conversion table


2. BEARING TOLERANCE & ACCURACY
Bearing accuracy consists of dimensional accuracy and running accuracy. The normal grade is P0,a higher grade is P6 and P2 is the highest grade.
Accuracy Grade Standard Conversion Table

Country

Standard

Tolerance Grade

China

GB/GB307.1

0

6

5

4

American

ANSI

ABEC-1

ABEC-3

ABEC-5

ABEC-7

 

ISO

0

6

5

4

Germany

DIN

P0

P6

P5

P4

Japan

JIS

P0

P6

P5

P4


3. INTERNAL CLEARANCE

The radial internal clearance of a bearing is of considerable importance, if satisfactory operation is to be obtained, as it greatly influences beairng performance including fatige life, vibration, noise, heat generation, etc.
The radial clearances of ZL bearings can be classified into C2, Standard, C3, C4 & C5

RADIAL CLEARANCE TABLE (μm)

Bore Diameter

C2

Standard

C3

C4

C5

over

incl

min

max

min

max

min

max

min

max

min

max

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

46

76

NOTE
1. Standard clearance is C0.
2. C2 Group clearance only for bearings over ABEC-3 accurancy.
4. VIBRATION AND NOISE
The vibration and noise of bearings are classified in four classes Z1, Z2, Z3, and Z4. It is measured by the instrument of S0910-1. For special requirement, it is measured by BVT-1 and classified as V1, V2, V3 , and V4.
The data are shown in the following tables, different vibration and noise requirement should be mentioned in order.
MAXIMUM VIBRATION ACCELERATION OF SINGLE BEARING(Tolerance in dB)

 

The Grease No and Function(Table 7)
Manufacturer Brand Drop point Consistency Operating   Tem  range Selection Criteria NMB
Code
Shell    Alvania R2 185 265-295 -35+120 general purpose  
   Darina 2 250 265-295 -25+150 general purpose  
Chevron    SRI-2 240 255-280 -30+120 water resistant  
Mobil    Mobilux 2 190 265-290 -10+110 genreal purpose  
   Mobil 22 192 250-274 -40+120 general purpose  
   Mobil 28 260 265-295 -55+175 wide range Temperature   
   Mobil 48 260 240-270 -60~+170 high temperature grease  
Esso    Beacon 325 193 290 -60+120 low-temperature grease LG20
    Polyrex EM 260 288 -40+180 high temperature low noise  
    Andok B 260 280 -40+120 normal temperature grease LG38
    Andok 260 200 250 -30+150 normal temperature grease LG71
    Arapen RB300 200 250 -30+100 normal temperature grease  
    UNIREX N2 250 280 -40+180 high temperature low noise  
    Polyrex EP2 280 280 -40+180 high temperature low noise  
    UNIREX N3 250 235 -40+180 high temperature low noise  
Kyodo Yushi     Multemp PS2 189 280 -50+110    low-temperature grease LY72
    Multemp SRL 191 245 -40+150    low noise grease LY121
    Multemp SC-A 260 280 0+160 normal temperature grease  
    Multemp ET150 260 280 -10+160 normal temperature grease  
    Oneluba 198 270 -10+110 normal temperature grease  
    Adrex 198 300 -10+120 normal temperature grease  
    Parmax 180 300 -10+120 normal temperature grease  
    Emalube 1130 260 300 -10+130 normal temperature grease  
    Unilube DL1 185 332 -10+110 normal temperature grease  
    Alumix HD1 247 335 0+120 normal temperature grease  
    Multemp LTS 250 201 -60+130 low-temperature grease  
    Multemp SRH 250 201 -40+150 low-temperature grease  
    Multemp SB-M 220 260 -40+200 high temperature high speed grease  
    Multemp SC-C 280 300 -40+200 high temperature pump-water grease  
    ET-K 260 300 -40+200 high temperture high speed alternators grease  
Kluber      Staburage NBU12 220 270 -35+150 normal temperature grease  
I    Sofled NBU15 220 280 -30+130 normal temperature grease  
     Asonic GLY32 190 265-295 -50+140 low-temperature grease  
     Asonic GHY72 250 250-280 -40+180 high temperature low noise  
  Isoflex SuperLds18 190 280 -60+130 low-temperature grease LY218
  Isoflex Super TEL     -65+70 low-temperature grease  

  Isoflex LDS18  Special A

190 280 -60+130 low-temperature grease  
Isoflex PDB38 CX100     -70+120 low-temperature grease  
Barrierta IMI/V   280 -50+220 high-low temperature grease  
Isoflex Topas NB52 204 280 -60+170 high-low temperature grease  
Barrierta L55/2   280 -35+260 high-low temperature grease  

     Barrierta EL

  280 -50+180 high-low temperature grease  
Asonic HQ72-102 240 250-280 -40+180 high-low temperature and low noise grease  
  Barrierta TK44N2     -60+230 high-low temperature grease  
Isoflex NCA15 180 265-295 -40+130 high speed grease  
Petamo GHY443 250 250-280 -20+180 high temperature longevity grease  
Petamo GHY133 240 250-280 -25+150 normal temperature grease  
China Hangu

       Hangu 2

198 265-295 -10~+130 low noise serive  
Dow Corning Molykote 33M 210 260 -70+180 high-low temperature grease LY81
Molykote 44M 204 260 -40+200 high temperature grease LY13
Molykote 55M     -55+165 low-temperature grease LY52

 

Click:7879  Input time:2008-11-1 【Printing】   
 
Copyright @ Zhejiang Zhengda Bearing Co., Ltd
     
Add: Weiliu Road, Yanpan Industrial Zone, Yueqing, City, Zhejiang Province, China 325600
Tel: 0086-0577-62665670/62665675/62665678 Mobile: 0086-13634216230 Fax: 0086-0577-62665679
Email: Email: [email protected]  [email protected] http://www.czdbearing.com
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