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UBC Bearings of America Limited

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Presentation on theme: "UBC Bearings of America Limited"— Presentation transcript:

1 UBC Bearings of America Limited

2 basic BEARING knowledge

3 What is a Bearing Used for?
Designed to: l Reduce friction l Carry loads l Guide moving parts

4 Rolling and Sliding Friction

5 Component parts of a ball bearing
Seal Rolling elements Inner ring Outer ring Cage Seal

6 Seal and Shield Variations
Shields Low-friction seals Seals Seal and Shield Variations -Z and -2Z -RZ and -2RZ -RS and -2RS Contaminant exclusion Silent running Grease retention Speed capability

7 Characteristics of Different Seals
Application Shield Seal Need 2Z 2RZ 2RS Low friction (+) – torque High speed (+) – ability Grease retention Dust exclusion Water – – + exclusion Low/high Depends on: Depends on: operating temperature Grease – Grease – Rubber mix +++ Excellent ++ Good + Fair – Poor

8 Storage Requirements

9 Roller and Ball Raceway Contact

10 Axial and Radial load capability
Combined load Fr Axial load Fa

11 Spherical roller (symmetrical) Spherical roller (asymmetrical)
Roller Types Spherical roller (symmetrical) Spherical roller (asymmetrical) Ball Cylindrical roller Taper roller Needle roller

12 Ball and Roller Bearing Ranges
+ Roller bearings Ball bearings Deep groove Angular contact Self-aligning Cylindrical Taper Spherical

13 Load Capabilities Load carrying capacity is expressed as the basic dynamic load rating

14 Ball Bearing Capabilities
Deep groove Angular contact Self-aligning Radial load Axial load Speed Accommodates carrying capacity carrying capacity capability misalignment

15 Function of the Cage  Prevent immediate contact between rolling elements to minimize friction and heat generation  Guide the rolling elements  Provide space for lubricant  Retain the rolling elements when bearings of separable design are mounted or dismounted

16 Cage Variants Nylon cage Steel cage Solid brass cage

17 + + + + – Nylon Cages Lightweight High elasticity
Good sliding properties + Good marginal lubrication properties Operating temperature < +120 °C

18 + + + + – Steel Cages Lightweight High strength
No operating temperature limit + High vibration and acceleration resistance Sensitive to poor lubrication

19 + + + – Solid Brass Cages Very high strength
Very high vibration and acceleration resistance + Suitable for very high speed in connection with circulating oil Relatively (very) expensive

20 Internal Clearances Radial clearance Axial clearance

21 The bearing internal clearance is defined
as the total distance through which one bearing ring can be moved relative to the other under zero measuring load.

22 Why Internal clearance?
In order to fit a bearing tightly on a shaft, it is necessary that the shaft is slightly larger than the bore of the inner ring. When the bearing is mounted, the inner ring will be expanded and consequently the space available for the rolling elements will be reduced. The reduction in space available for rolling elements when the bearing is mounted is accommodated by the internal clearance.

23 Why Internal clearance?
Steel will expand with increased temperature. In operation, the temperature of the various parts of a bearing will not remain uniform and resulting in varying degrees of expansion which is compensated by the internal clearance.

24 Internal Radial Clearance
COLD Reduced radial clearance Compression Clearance range C1 Clearance less than C2 C2 Clearance less than Normal C3 Clearance greater than Normal C4 Clearance greater than C3 C5 Clearance greater than C4 Expansion WARM

25 The internal clearance required is
dependent upon the mounting fit and the operating conditions. In case of doubt, a bearing with greater internal clearance shall always be selected.

26 Effect of Internal Preload and Clearance on Bearing Life
Relative basic rating life L10, % Preloading Clearance

27 Correct Fits Tolerance range for bearings manufactured to ISO

28 Bearing Selection Factors
Available space Misalignment Speed Life Load/Direction Operating conditions

29 International Organization for Standardization
ISO Standards ISO International Organization for Standardization

30 Diameter Series

31 Relationship: Diameter and Width Series
Diameter Series Width Series Height Series

32 Dimension Series Diameter Series Width Series

33 Bore designation system
Bore diameter Written as Example Below 10 mm 3 . 9 623 629 10 – 17 mm 10 12 15 17 00 01 02 03 6200 6201 6202 6203 20 – 480 mm 20 25 480 04 05 96 6204 6205 61896 Above 500 mm 710 /710 241/710

34 How the Designation System Works
Bearing types Radial bearings, width (B, T) Thrust bearing, height (H) Outside diameter (D) Bearing size d/5 (30 mm bore diameter)

35 Tapered Bore Suffixes Suffix K Taper 1:12 Suffix K30 Taper 1:30


37 Deep groove ball bearing

38 Self-aligning ball bearing

39 Plane thrust ball bearing

40 Angular contact ball bearing

41 Spherical roller bearing

42 Taper roller bearing

43 Cylindrical roller bearing


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