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         DRAWN CUP NEEDLE ROLLER    BEARINGS

RTL drawn cup needle roller bearings is formed with thin steel plate through precision punching with very sectional height and big load capacity. This kind of bearings are especially applicable to the big quantity production with economic demands.

Stable combination is used between the needle bearings and the bearing cage. No axle fixture is required. Even under high speed and heavy load condition, the bearing functions can be fully maintained. Furthermore, no lubricating for a long time is possible due to its high storage volume of grease.

 

   

 

HK

Piercing drawn cup needle roller bearings with open ends

HK...RS

Piercing drawn cup needle roller bearings with open ends, single side sealing

HK...2RS

Piercing drawn cup needle roller bearings with open ends, double sides sealing

BK

Sealed drawn cup needle roller bearings with closed ends

BK...RS

Sealed drawn cup needle roller bearings with closed ends, single side sealing

MF

Sealed drawn cup needle roller bearings with closed ends, tip full complement needle roller type

MFY

Sealed drawn cup needle roller bearings with closed ends, flat head full complement needle roller type

F

Piercing drawn cup needle roller bearings with open ends, tip full complement needle roller type

FY

Piercing drawn cup needle roller bearings with open ends, flat head full complement needle roller type

SCE

Piercing drawn cup needle roller bearings with open ends, inch system

BCE

Sealed drawn cup needle roller bearings with closed ends, inch system

 

Drawn cup needle roller bearings

                              RTL drawn cup needle roller bearings is composed of thin wall punched outer ring, retainer and a group of needle rollers. To compare with
                         the Piercing drawn cup needle roller bearings with open ends , this is a kind of sealed bearing with one end sealed. This kind of bearings are appl-
                         icable to the shaft ends with small axial moving force.

Sealed drawn cup needle roller bearings

                             The sealed drawn cup needle roller bearings has a sealing lip. Under general condition, it can protect the dirt from entering into the bearing
                        and the lubricant leakage. The sealing ring is made of compound rubber with operational temperature of -20℃?20℃ The bearings have been 
                        filled with quality lithium based grease when supplied. Furthermore the standard designing of the drawn cup needle roller bearing is non-oil hole,
                       while the double row drawn cup needle roller bearings are designed with the standard of oil holes. Should there be any option, please notice us in 
                       orders
 

Full complement needle roller type drawn cup needle roller bearings

               This kind bearings are composed of full width needles which extend outside of the outer rings. Therefore it will sustain heavy load and is suitable
                       for the rocking action of low and medium speed. The bearings can be used instantly once it is assembly because lubricating grease is filled in the be-
                       aring before supplied.

Mounting

                             The outer ring of the drawn cup needle roller bearings made of thin steel plate through punching will reach the correct shape and dimension pre-
                      cision when it is pressed into the bearing cage . Therefore ,  the dimensional precision and the shape of bearing cage will directly effect the inscribed 
                      circle  of the bearing. Thus enough attention must be attached to the size and shape of the bearing cage.
In mounting this kind of bearings, it will be easier to use the pressing core shaft as illustrated in the figure. Special tool must be used to press on the side with printed code mark to compress get the bearings fitted when assembling. Direct hammer tapping is strictly forbidden. The core shaft must be made as per the requirements shown below.

A=D-(0.2--0.3)mm

B=Fw-(0--0.025)mm

 

The inspection of the drawn cup needle roller bearings

                                     In regard to the dimension inspection of this kind of needle bearings , it is meaningless to measure the single bearing because the bearing 
                         will deformed after quenching due to its thin outer ring wall. That is: this kind of needle bearings must be fitted into the bearing cage according to
                         the recommended permissible tolerances before it can reach the vital functional inscribed circle and circularity. So, the following inspection met-
                         hods are recommended:
(1) press the bearing into basic gauge with rigidity shown in the list (the wall thickness is no less than 20mm) .
(2) check with a feeler gage or taper gage the inscribed circle to see if it falls in the required range .
 

THE TOLERANCE OF THE NEEDLE INCIRCLE DIAMETER AND THE BASIC RING GATE DIMENSION METRIC SYSTEM
              THE TOLERANCE OF THE NEEDLE INCIRCLE DIAMETER AND THE BASIC RING GATE DIMENSION INCH SYSTEM

Rational needle incircle diameter

Inner diameter of the basic ring gage

Needle incricle toleranceμm

HK      BK

Tolerance

Up

Down

Fw  mm

3

6.848

+16

+6

4

7.984

+28

 

 

+10

 

 

5

8.984

6

9.984

7

10.98

+31

 

 

 

+13

 

 

 

8

11.98

9

12.98

10

13.98

12

15.98

+34

 

 

 

 

 

 

 

+16

 

 

 

 

 

 

 

12

17.98

13

18.976

14

19.976

16

20.976

16

21.976

17

22.976

18

23.976

19

 

+41

 

 

 

 

 

 

 

 

 

+20

 

 

 

 

 

 

 

 

 

20

25.976

21

 

22

27.976

24

 

25

31.972

26

 

28

34.972

29

 

30

36.972

32

 

+50

+25

35

41.972

37

 

38

 

40

46.972

45

51.967

50

57.976

Rational needle incircle diameter

Inner diameter of the basic ring gage

Needle incricle tolerance
μm

SCE   BCE

Tolerance

Up

Down

Fw  mm

6.35

11.125

6.411

6.388

7.938

12.713

7.998

7.976

9.525

14.3

9.586

9.563

11.112

15.888

11.173

11.151

12.7

17.475

12.761

12.738

14.288

19.063

14.348

14.326

15.875

20.65

15.936

15.913

17.462

22.238

17.523

17.501

19.05

25.387

19.086

19.063

20.638

26.975

20.673

20.65

22.225

28.562

22.261

22.238

23.812

30.15

23.848

23.825

25.4

31.737

25.436

25.413

26.988

33.325

27.023

27

28.575

34.912

28.611

28.588

30.162

38.087

30.198

30.175

31.75

38.087

31.768

31.763

34.925

41.262

34.963

34.938

38.1

47.612

38.141

38.113

41.275

50.787

41.316

41.288

44.45

53.962

44.493

44.463

47.625

57.137

47.668

47.638

50.8

60.312

50.846

50.815


 
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