1. Bearing Types ppt
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Transcript of 1. Bearing Types ppt
Bearing Types
History of Inventions of Rolling Element Bearings
Primary Function of Bearings
• Transmit loads
• Reduce Friction
• Secondary roles– Support the shaft– Locate the shaft
Bearing Loads
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
Roller and Ball Raceway Contact
Types of Rolling ElementsSpherical roller(asymmetrical)
Spherical roller(symmetrical)Ball
Taper roller
Needle roller
Cylindrical roller
Bearing Components(Deep Groove Ball Bearing)
Seal Rolling Elements Inner RingOuter ring Cage Seal
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
Bearing Loads
Radial rolling bearings
Deep grooveball bearing
Angular contactball bearing
Self-aligningball bearing
Cylindricalrollerbearing
Taperrollerbearing
Needlerollerbearing
Sphericalroller bearing
Ball bearings Roller bearings
Radial rolling bearings
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
Bore
Bore surface
O.D. surface
O.D.
Bearing Terminology
Inner ring raceway
Side faces
Inner ring land
Outer ring raceway Outer ring land
Bearing Terminology
Ball and Roller Bearing Ranges
Deep groove
Ball bearings Roller bearings+Angularcontact
Self-aligning Cylindrical Taper Needle Spherical
Load Capabilities
Load carrying capacityis expressed as the basicdynamic load rating
Relative Speed Limitations
Grease lubricationspeed rating
Oil lubricationspeed rating
r/min
Bearing Contact Angle
Single Cylindrical Angular Taper Spherical Row Roller Contact Roller Roller
Radial Loads Combined Loads
Bearing ComponentsOuter Ring
Inner Ring
Cage
Rolling Element
Closures: Shields
Non-Contact Seal
RZ
Land Riding Lip Seal
RS1
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
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
Radialclearance
Axialclearance
Internal Clearances
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