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Bearings do these 4 things
- Support moving parts
- Reduce wear
- Provides a replacable wear surface
- Reduce friction
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What are 3 types of bearings
- Anti-Friction bearings
- Plain bearings
- Elastamaric bearings
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What are the 2 types of bearing loads
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4 advantages of plain bearings
- Rigid operation
- quiet
- low cost
- requires little space
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2 disadvantages of plain bearing
- higher friction
- requires continous lubrication
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3 Advantages of anti-friction bearings
- Low friction operation
- Can be packed to reduce frequency of lubrication
- More versatile due to many different designs
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4 disadvantages of anti-friction bearings
- noisier operation
- require more space
- higher cost than plain bearings
- less rigidity than plain bearings
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5 types of roller bearings
- cylindrical rollers
- tapered rollers
- needle
- ball
- spherical rollers
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4 types of ball bearings
- radial load
- thrust load
- radial and thrust
- self-aligning
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5 types of roller bearings
- straight roller - Radial
- tapered roller - radial , thrust
- Thrust
- self-aligning radial , thrust- concave roller
- self-aligning radial , thrust- spherical roller
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2 types of needle bearings
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How many sets of rollers do self aligning bearings have
2
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4 types of bearing sealing
- No seal
- one sided seal
- both sides sealed - Greasable
- both sides sealed - non greasable
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When the inner races of angular contact bearings are set with the thrust faces together they are said to be`......`
Face to face
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When the outer races of angular contact bearings are set together they are said to be`......`
Back to back
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When the thrust faces of each bearing arefacing the same direction the bearings are said to be `......`
In tandem
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When manufacturers want bearings installed in a particular stack up , how are they usually indicated
match marks
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Early flaking of bearing races is a sign of ...
overheating
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Ecccentric wear of bearing retianer is a sign of...
poor lubrication or foreign material
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Flaking and smearing in a small area of the race is a sign of...
defective lubrication
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brinnelling is caused by
bearing impact while stationary
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repeated pitting of bearings can be a sign of ...
electrical arcing due to poor grounding
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When drying bearings with air , what precaution should be taken
hold both races to prevent spinning of bearing
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Before exposing bearings what should be done
Remove all dirt from housing to prevent contamination
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Bearings should be stored in
oil proof paper
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When installing a bearing what must never be done
pounding directly on the bearing , always use a soft metal slug
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When choosing a drift , what must be kept in mind
Must be of softer material than the bearing
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When precooling what should be done to protect bearing
Put in sealed bag to prevent moisture from forming
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How should bearings be heated
oil bath or convection heat ,NEVER open flame
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Tapered bearings need what process on instation
preloading process
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What is the process for sealing rod end bearings called
Staking
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5 types of elastimeric bearings
- conical
- spherical
- radial
- cylindrical
- spherical tubular
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3 ways elastimerics can be damaged
- Limit loading
- enviromental
- fatigue
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what are the 2 basic types of seals
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what are 2 types of face seals
- carbon face
- magnetic face
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2 types of clearance seals
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2 types of preformed gaskets
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2 types of metallic gaskets
- copper crush
- aluminum crash
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2 types of non-metallic gaskets
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3 types of radial lip seals
- single lip
- double lip
- double lip exclusion
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a green dash on an o-ring means
use with skydrol
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red dash or stripe on o-ring means
use in fuel system
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blue dash or stripe on o-ring means
use with mil-h-5606
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Wha tis an o-ring lubricated with
whatever fluid it is used with
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