Bearings And Seals 150402b

Question 1

Name two general classifications of bearings

Answer 1

Plain and anti-friction

Question 2

What type of lubrication is recommended for high-speed applications?

Answer 2

Pressurized oil

Question 3

Bearing loads can be expressed using what terms?

Answer 3

Combination of both radial and axial

Question 4

The numbers C1 and C5 etched on bearing race Rings indicate the …

Answer 4

Clearance between rolling elements and race

Question 5

The bearing style that would take up the least space is the…

Answer 5

Needle roller

Question 6

Which anti friction bearing will provide the highest axial load resistance when used in pairs?

Answer 6

Tapered roller bearing

Question 7

If a plane bearing having a 1.5 inch outside diameter is to be installed into a housing, then the approximate hole size for an interference fit would be?

a) 1.490”
b) 1.499”
c) 1.501”
d) 1.510”

Answer 7

b) 1.499”

Question 8

Single row angular contact ball bearings are used for…

Answer 8

Radial and axial loads

Question 9

The best method to install a new bearing on a shaft would be to…

Answer 9

Place the bearing and heated oil prior to installation

Question 10

The width of an O-ring Groove should be approximately…

Answer 10

150% of the O-ring width

Question 11

What is in the alloy composition of Babbitt metal?

Answer 11

Tin, lead, antimony, copper

Question 12

When heating a sealed anti-friction bearing with heated oil, the temperature of the oil should be no more than?

Answer 12

175 degrees Fahrenheit

Question 13

Lip seals are used to?

Answer 13

Retain lubricant and keep out contamination

Question 14

When discussing o-ring Theory, backup washers will …

Answer 14

Increase the pressure the O-ring can withstand

Question 15

One critical component of Machining an O-ring Groove would be to…

Answer 15

Break the edges of the groove

Question 16

U-cup packings are most commonly found in ______applications

Answer 16

Hydraulic

Question 17

A double lip seal is designed to…

Answer 17

Used to control internal seepage and prevent external contamination

Question 18

Which of the following is used for static assemblies only?

O ring
U cup
Lip seal
Gasket

Answer 18

Gasket

Question 19

Advantages of plain bearings?

Answer 19

Require less space
Quieter than roller
Cost Less than roller
More rigid than roller

Question 20

Disadvantages of plain bearings?

Answer 20

More friction

Constant lubrication

Question 21

What are solid plain bearings often called?

Answer 21

Journal bearings

Question 22

What’s materials are plain bearings made from?

Answer 22

Bronze
Sintered bronze
Plastics
Babbitt

Question 23

Which material does not Gall or seize with journals?

Answer 23

Bronze

Question 24

Which material is commonly called oil-lite, is porous, and can be replenished in warm oil?

Answer 24

Sintered bronze

Question 25

Which material is corrosion-resistant, easy to machine, quiet and requires little or no lubrication?

Answer 25

Plastics Nylon-small bearings Teflon- very slippery, no lube Rubber- used when water is present

Question 26

Which material can be cast in place or deposited on a stiff backing material?

Answer 26

Babbitt

Question 27

Advantages of split plain bearings?

Answer 27

Replacement without removing the shaft Clearances adjustable by shims Uses locking tabs or dowel pins

Question 28

Which plain bearing prevents axial movement of a shaft?

Answer 28

Plain thrust bearings

Question 29

What do anti-friction bearings rely on rather than a film of oil?

Answer 29

Precision rollers

Question 30

What are the advantages of anti-friction bearings?

Answer 30

``` Friction is low Less axial space required Maintains accurate shaft alignment Both radial and axial loads can be carried Lubrication is simple sealed or none ```

Question 31

Three types of anti-friction bearings

Answer 31

Ball bearings Roller bearings Thrust bearings

Question 32

5 types of ball bearings

Answer 32

``` Single row deep Groove Double row deep Groove Single row angular Double row angular Self-aligning internal and external ```

Question 33

Name the five parts of a bearing

Answer 33

The outer ring an inner ring or race Raceways Rolling elements Cage or separator

Question 34

Which bearing is the most common type of bearing and is primarily for radial loads but can take moderate axial loads in either direction?

Answer 34

Single row deep Groove

Question 35

Which bearing permits a higher radial load capacity than single row, does not handle axial loads well, and does not tolerate any misalignment

Answer 35

Double row deep Groove

Question 36

Which bearing supports combination loads, Must be pre-loaded in One Direction, often used in pairs opposite each other, and only tolerate a small amount of misalignment?

Answer 36

Single row angular contact

Question 37

Which bearing is meant for heavy radial and axial loads and can take axial loads in both directions. Tolerates no misalignment

Answer 37

Double row angular contact

Question 38

Which bearing can tolerate up to 1 and 1/2 degrees of misalignment?

Answer 38

Internal self-aligning

Question 39

Which bearing support a much higher radial load than ball bearings and has elements that are Precision ground cylinders rather than balls?

Answer 39

Roller bearings

Question 40

Which bearing is meant for very large radial loads, tolerate little or no end thrust?

Answer 40

Cylindrical roller bearing

Question 41

Which roller bearing takes both radial and axial loads and tolerates up to 2 and 1 / 2 degrees of misalignment?

Answer 41

Double row spherical

Question 42

Which roller bearing has the highest axial and thrust loading when used in pairs and is meant for large radio loads and large uni directional axial loads?

Answer 42

Tapered roller bearing

Question 43

Which roller bearing is used in pairs to accommodate reversing loads and clearances are adjusted by moving Cup and Cone axially

Answer 43

Single row tapered roller bearing

Question 44

Which roller bearing is meant for large heavy engineering applications matched to suit their function so not interchangeable?

Answer 44

Double row tapered roller bearing

Question 45

Which roller bearing takes up less space than any other anti-friction bearing and has no inner race and meant for radial loads only

Answer 45

Needle roller bearings

Question 46

Which bearing is meant primarily for thrust axial side loads and cannot take any radial load?

Answer 46

Thrust bearing

Question 47

Which bearing can take a heavy thrust load and a moderate radial load

Answer 47

Spherical and tapered roller bearing

Question 48

Which internal clearance designation provides for the largest clearance? C1 C3 C5

Answer 48

C1

Question 49

What is the rule of thumb for interference with the housing when installing plain bearings?

Answer 49

Point 00075" to .0001 per inch of diameter

Question 50

What two material shims are used with split plain bearings

Answer 50

Stainless steel first brass otherwise

Question 51

What do you use for a housing fit check on a bearing

Answer 51

Feeler gauges

Question 52

What two things should you not do to a new bearing

Answer 52

Do not clean it and do not spin a bearing with an Air Blast

Question 53

Never heat an unsealed bearing above _____ degrees Fahrenheit. Never heat a sealed bearing above _____ degrees Fahrenheit

Answer 53

250 unsealed | 175 sealed

Question 54

When seating a bearing in a housing do you direct the force against the outer or inner ring?

Answer 54

Outer ring

Question 55

Four types of seals?

Answer 55

Gaskets, O-rings, U section Rings, lip seals.

Question 56

O-rings...

Answer 56

Made of rubber like compounds Meant to deform slightly Nitrile, EPDM, calrez are different types

Question 57

What is the rule for o-ring depth grooves and the width of the groove?

Answer 57

Static assembly 70% of the width of the O-ring Dynamic assemblies 80% Which of the group should be one and a half times the width of the Ring or 150%

Question 58

When making o-ring grooves you must be sure to...

Answer 58

Break the edges of the top corners but don't chamfer them

Question 59

What is sometimes necessary to hold a U ring in position

Answer 59

A support ring

Question 60

Which seal is designed to keep lubricant in and contamination out

Answer 60

Lip seal or double lip seal

Question 61

Types of lubrication

Answer 61

Boundary sliding surfaces contact each other | Full film sliding surfaces are separated by a pressurized film of oil