1. Bearing Types ppt
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Transcript of 1. Bearing Types ppt
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Bearing Types
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History of Inventions of Rolling Element Bearings
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Primary Function of Bearings
• Transmit loads
• Reduce Friction
• Secondary roles– Support the shaft– Locate the shaft
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Bearing Loads
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How did a bearing evolve ?
* Invention of wheel
* Wheel rotates on axle
* Wear Plate + Rollers
* Inner ring + Outer ring
+ Rollers
* With introduction of
cage Rolling Bearing
was created
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Roller and Ball Raceway Contact
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Types of Rolling ElementsSpherical roller(asymmetrical)
Spherical roller(symmetrical)Ball
Taper roller
Needle roller
Cylindrical roller
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Bearing Components(Deep Groove Ball Bearing)
Seal Rolling Elements Inner RingOuter ring Cage Seal
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Characteristics
Deep grooveball bearing
Angular contactball bearing
Self-aligningball bearing
Ball bearings Point Contact :
* Less area of contact* Less friction* More speed * Less load
Cylindricalrollerbearing
Taperrollerbearing
Needlerollerbearing
Sphericalroller bearing
Roller bearingsLine Contact :
* More area of contact* More friction* Less speed * More load
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Bearing Loads
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Radial rolling bearings
Deep grooveball bearing
Angular contactball bearing
Self-aligningball bearing
Cylindricalrollerbearing
Taperrollerbearing
Needlerollerbearing
Sphericalroller bearing
Ball bearings Roller bearings
Radial rolling bearings
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Thrust ball bearing
Ball bearings Roller bearings
Thrust bearings
Angular Contact Ball Thrust bearing
Taper Roller Thrust
bearing
Spherical Roller Thrust
bearing
Cylindrical / Needle Roller Thrust
bearing
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Bore
Bore surface
O.D. surface
O.D.
Bearing Terminology
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Inner ring raceway
Side faces
Inner ring land
Outer ring raceway Outer ring land
Bearing Terminology
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Ball and Roller Bearing Ranges
Deep groove
Ball bearings Roller bearings+Angularcontact
Self-aligning Cylindrical Taper Needle Spherical
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Load Capabilities
Load carrying capacityis expressed as the basicdynamic load rating
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Relative Speed Limitations
Grease lubricationspeed rating
Oil lubricationspeed rating
r/min
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Bearing Contact Angle
Single Cylindrical Angular Taper Spherical Row Roller Contact Roller Roller
Radial Loads Combined Loads
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Bearing ComponentsOuter Ring
Inner Ring
Cage
Rolling Element
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Closures: Shields
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Non-Contact Seal
RZ
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Land Riding Lip Seal
RS1
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Rolling Bearings are Precision Products
1µ
How much is a µ?
Ahuman
hair
0,06 mmStandard
High precision bearing
Precision bearing
Normal
P6 P6SP
P4AUP
PA9APA9B
Toleranceclasses
0/-15 µm0/-12 µm
0/-9 µm 0/-7 µm0/-2,5 µm
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Precision Classes Precision classes: US vis-a-vis Europe
ABEC ISO
1 Normal
3 P6
5 P5
7 P4
9 P9– Generally, use bearings no more than one
precision class better than the precision of the mating components
– Extra precision has no benefit if applied to poorly made mating components
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Radialclearance
Axialclearance
Internal Clearances
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Bearing Basics
C1 - Less than C2 clearance
C2 - less than normal clearance (CN, C0) - normal clearance (not generally marked)
C3 - greater than normal clearance (“standard”)
C4 - greater than C3 clearance
C5 - greater than C4 clearance
Example:
A 6210 /C3 Ball bearing has from 18 - 36 µm (microns) or 0.0007” - 0.0014” Radial Internal Clearance