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Special bearings

Special ball bearings have usually non standard dimensions or design. Such bearings are determined to be used in machines, devices and facilities the design of which does not allow to use standard types.

Special ball bearings

We produce special single row ball bearings mainly related, from point of view construction, to standard ball bearings.

Such bearings are usually used like rollers in machines and devices in various industries. On the other hand, special double row self-aligning ball bearings with larger inner rings are intended for the aircraft industry, i.e. to be used for control rods in planes, travelling roller with journal is designed for transport devices..

ur special bearings (bearing pulleys) can be used for temperatures up to 150°C. We offer also stabilised ball bearings for high operating temperatures by 350°C, shielded with lubricants up to 300°C and sealed bearings up to 200°C. Two-pieces are made from steel, eventually brass sheets, plastic cages are from various materials (usually polyamide PA66).
There is a big assortment of special bearings. If you need to choose the proper one, consult our overview below mentioned catalogue or download the appropriate group of bearings as a catalogue file. Dimensions or design are not binding. To meet customers demand we can prepare even complicated specifications.

The mentioned list of special ball bearings is only illustrative and represents some of up-to-now produces non- standardized bearings.
We are prepared to answer your questions regarding the production possibility of special bearings to your needs and requirements. Write to us: sales@vrl.cz or call us: +420 272 701 560.

Spherical sliding plain bearings

Spherical bearings belong into the group of plain bearings. They consist from outer and inner ring with a spherical sliding face.

They are used for high surface pressures. With respect to the non-efficient lubrication, the spherical bearings are used only for slow pendulous motion. Their design enables only minimal needed maintenance and they usually show almost no wear. The rings are made from hardened bearing steel (14 109.4, 100Cr6). Gliding surfaces are ground and super finished. Allowed working temperature of steel plain bearings range from –200°C till +400°C.

VRL Praha produces plain joint bearings in basic design, with normal radial clearance and in dimensions mentioned in the following catalogue. Spherical plain bearings with other design, form or variation can be manufactered according to customer’s requests and need.

Dimension in [mm]

Designation
of bearing

dDBC12a
[°]
weight
[g]
GE 4

4

12

5

3

6

8

16

2,7

GE 5

5

14

6

4

8

10

13

4,7

GE 6

6

14

6

4

8

10

13

4,3

GE 8

8

16

8

5

10

13

15

6,9

GE 10 *

10

19

9

6

13

16

12

11,3

GE 12 *

12

22

10

7

15

18

11

16,4

GE 15 *

15

26

12

9

18

22

8

27,4

GE 17 *

17

30

14

10

20

25

10

41,6

GE 20 *

20

35

16

12

24

29

9

66,2

Basic geometric tolerance

Inner ring
[mm]tolerance [mm]

0 – 10

0 / -0,008

10 – 18

0 / -0,008

18 – 30

0 / -0,010

[mm]tolerance [mm]

0 – 30

0 / -0,120

Outer ring
[mm]tolerance [mm]

0 – 18

0 / -0,008

18 – 30

0 / -0,009

30 – 50

0 / -0,011

[mm]tolerance [mm]

0 – 30

0 / -0,240

Other variants and designs

Except for the basic range of radial spherical bearings (GE variants) in complete units, VRL Praha a.s. can also offer the separate rings of different shapes, forms and designs. These rings can be delivered in lathe-turned versions as well as with ground bore, ground raceway and faces according to customer’s request. Other production operations, such as drilling of lubrication holes or lathe-turning of outer and inner oil grooves, need to be agreed for every single case. The pictures below are only illustrative.