3. Bearings And Seals

Question 1

all bearings are designed to preform what functions?

Answer 1

1. provide support and alignment for a moving part
2. reduce friction
3. decrease wear
4. provide a replaceable wear surface

Question 2

radial loads act:

Answer 2

at 90* to the axis of shaft

Question 3

axial loads act:

Answer 3

parallel to axis of shaft

Question 4

what are the two basic classes of bearings?

Answer 4

1. friction

2. anti-friction

Question 5

what is bearing crush?

Answer 5

the press fit that seats the bearing halves after assembly

Question 6

what are the 3 types of anti-friction bearings?

Answer 6

1. ball
2. roller
3. needle

Question 7

anti-friction bearings can be designed to absorb what kind of loads?

Answer 7

Axial
Radial
Combination of both

Question 8

what are most common designs of roller bearings?

Answer 8

1. Tapered
2. plain roller
3. spherical roller
4. needle

Question 9

the roller in a spherical roller bearing is shaped like what?

Answer 9

Barrel-shaped

Question 10

how are ball bearings categorized?

Answer 10

the type of raceway each contains

Question 11

what are seals commonly used for?

Answer 11

1. keep fluids in
2. keeps contaminates out
3. hold pressure or vacuum

Question 12

what are the two classed of seals?

Answer 12

1. dynamic

2. static

Question 13

where are static seals used?

Answer 13

where there are no moving parts

Question 14

what are common types of static seals?

Answer 14

1. O-rings
2. Gaskets
3. sealants

Question 15

where are dynamic seals used?

Answer 15

where there are moving parts?

Question 16

what are 4 basic types of radial lip seals?

Answer 16

1. Single lip seals
2. Single lip spring loaded
3. Double lip
4. Dual lip

Question 17

single lip seals have?

Answer 17

One sealing lip that is not spring loaded

Question 18

Single lip spring loaded seals have?

Answer 18

One sealing lip that is spring loaded

Question 19

double lip seals have?

Answer 19

One spring loaded lip, and one dust lip

Question 20

Dual lip seals have?

Answer 20

Two lips and both are spring loaded

Question 21

what are the common designs of mechanical seals?

Answer 21

1. Exclusion
2. Clearance
3. Wind Backs
4. Face seals
5. Dust shields

Question 22

what are some of the common types of bearing failure?

Answer 22

1. Peeling
2. Spalling
3. Brinelling
4. Arcing
5. Fatigue

Question 23

What is peeling caused by?

Answer 23

an insufficient lubricating film

Question 24

Heavy preload and poor lubricant film may result in?

Answer 24

Spalling

Question 25

what are some of the common seal failures?

Answer 25

1. Contamination
2. Ingested Contamination
3. Pitting and Bruising
4. Etching

Question 26

what is most common source of bearing failure?

Answer 26

contamination

Question 27

what is brinelling?

Answer 27

Impact denting. can be caused by: hammer blows, dropping the bearing, shock loading on the machine

Question 28

when heating a bearing avoid the use of:

Answer 28

A flame

Question 29

what is the most secure and effective bearing puller is:

Answer 29

The bearing splitter

Question 30

T/F. silicone may be used with cork or paper gaskets?

Answer 30

False

Question 31

What should be used to clean bearings?

Answer 31

fresh solvent, blow dry with compressed air