ubc bearings of america limited. basic bearing knowledge
TRANSCRIPT
![Page 1: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/1.jpg)
UBC Bearings of America Limited
![Page 2: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/2.jpg)
basicBEARINGknowledge
![Page 3: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/3.jpg)
What is a Bearing Used for?
Designed to:
Reduce friction
Carry loads
Guide moving parts
![Page 4: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/4.jpg)
Rolling and Sliding Friction
µ
µ
![Page 5: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/5.jpg)
Component parts of a ball bearing
Seal Rolling elements Inner ringOuter ring Cage Seal
![Page 6: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/6.jpg)
Shields Low-friction seals Seals
-Z and -2Z -RZ and -2RZ -RS and -2RS
Contaminantexclusion
Silentrunning
Greaseretention
SpeedcapabilityS
eal a
nd
Sh
ield
Var
iati
ons
![Page 7: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/7.jpg)
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:operatingtemperature Grease – Grease
– Rubber mix
+++ Excellent ++ Good + Fair – Poor
Characteristics of Different Seals
![Page 8: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/8.jpg)
Storage Requirements
![Page 9: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/9.jpg)
Roller and Ball Raceway Contact
![Page 10: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/10.jpg)
Axial and Radial load capability
Axial load
Radial loadCombined load
Fa
Fr
![Page 11: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/11.jpg)
Roller Types
Spherical roller(asymmetrical)
Taper roller
Spherical roller(symmetrical)
Needle roller
Cylindrical roller
Ball
![Page 12: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/12.jpg)
Ball and Roller Bearing Ranges
Deep groove
Ball bearings Roller bearings+Angularcontact
Self-aligning Cylindrical Taper Spherical
![Page 13: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/13.jpg)
Load Capabilities
Load carrying capacityis expressed as the basicdynamic load rating
![Page 14: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/14.jpg)
Ball Bearing Capabilities
Deep groove Angular contact Self-aligning
Radial load Axial load Speed Accommodates
carrying capacity carrying capacity capability misalignment
![Page 15: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/15.jpg)
Function of the Cage
Prevent immediate contact betweenrolling elements to minimize frictionand heat generation
Guide the rolling elements
Provide space for lubricant
Retain the rolling elements when bearings of separable designare mounted or dismounted
![Page 16: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/16.jpg)
Cage Variants
Nylon cage Steel cage Solid brass cage
![Page 17: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/17.jpg)
Nylon Cages
+ Lightweight
+ High elasticity
+ Good sliding properties
+ Good marginallubrication properties
– Operating temperature< +120 °C
![Page 18: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/18.jpg)
Steel Cages
+ Lightweight
+ High strength
+ High vibration andacceleration resistance
– Sensitive topoor lubrication
+ No operatingtemperature limit
![Page 19: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/19.jpg)
Solid Brass Cages
+ Very high strength
+Suitable for very highspeed in connectionwith circulating oil
– Relatively (very) expensive
+ Very high vibration andacceleration resistance
![Page 20: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/20.jpg)
Internal Clearances
Radialclearance
Axialclearance
![Page 21: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/21.jpg)
The bearing internal clearance is definedas the total distance through which onebearing ring can be moved relative to the other under zero measuring load.
![Page 22: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/22.jpg)
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.
![Page 23: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/23.jpg)
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.
![Page 24: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/24.jpg)
Internal Radial Clearance
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
COLD
WARM
Reducedradial
clearance
Expansion
Compression
![Page 25: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/25.jpg)
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.
![Page 26: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/26.jpg)
Effect of Internal Preload and Clearance on Bearing Life
Relative basic rating life L10, %
Preloading Clearance
![Page 27: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/27.jpg)
Correct Fits
Tolerance range for bearings manufactured to ISO
![Page 28: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/28.jpg)
Operating conditions
Available space Misalignment
Speed Life
Load/Direction
Bearing Selection Factors
![Page 29: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/29.jpg)
International Organization forStandardization
ISOISO
ISO Standards
![Page 30: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/30.jpg)
Diameter Series
![Page 31: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/31.jpg)
Relationship: Diameter and Width Series
Diameter Series
Width Series Height Series
![Page 32: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/32.jpg)
Dimension Series
Width Series
Dia
met
er S
erie
s
![Page 33: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/33.jpg)
Bore diameter Written as Example
Below 10 mm
3
.
.
9
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
Bore designation system
![Page 34: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/34.jpg)
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)
![Page 35: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/35.jpg)
Tapered Bore Suffixes
Suffix K
Suffix K30
Taper 1:12
Taper 1:30
![Page 36: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/36.jpg)
![Page 37: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/37.jpg)
Dee
p g
roov
e b
all b
eari
ng
![Page 38: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/38.jpg)
Sel
f-al
ign
ing
bal
l bea
rin
g
![Page 39: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/39.jpg)
Pla
ne
thru
st b
all b
eari
ng
![Page 40: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/40.jpg)
An
gula
r co
nta
ct b
all b
eari
ng
![Page 41: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/41.jpg)
Sp
her
ical
rol
ler
bea
rin
g
![Page 42: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/42.jpg)
Tap
er r
olle
r b
eari
ng
![Page 43: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/43.jpg)
Cyl
ind
rica
l rol
ler
bea
rin
g
![Page 44: UBC Bearings of America Limited. basic BEARING knowledge](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5513d44e5503466f748b4e53/html5/thumbnails/44.jpg)
THE END