Machine Elements

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3 Types of shaft loading

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UoN machine elements exam

36 Terms

1

3 Types of shaft loading

Torsion, Axial and transverse

<p>Torsion, Axial and transverse</p>
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2

What are the 3 types of shaft misalignments ?

Axial, Parallel and Angular

<p>Axial, Parallel and Angular</p>
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3

What Type of Misalignment does Thermal expansion cause?

Axial

<p>Axial</p>
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4

What type of coupling allows for some misalignment and also provides some damping?

Flexible couplings

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5

Name two types of Rigid Couplings

Flange Coupling

Muff coupling

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6

2 ways the flange coupling secure onto the shafts

Interference fit

Keyed Connection

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7

How does the muff coupling connect onto the shafts?

Tightening the screws on it to clamp onto the shafts

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8

What is the difference between Kinematic and resilient flexible couplings

Kinematic:

Rigid components , no shock damping

Resilient:

Flexible components, provides shock damping

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9

3 types of kinematic flexibility couplings

Claw Coupling

Bellows Coupling

Oldham Coupling

<p>Claw Coupling</p><p>Bellows Coupling</p><p>Oldham Coupling</p>
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10

3 types of Resilient flexibility couplings

Flexible Disk Coupling

Flexible Claw Coupling

Rubber Tyre Coupling

<p>Flexible Disk Coupling</p><p>Flexible Claw Coupling</p><p>Rubber Tyre Coupling</p>
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11

4 example of different elements you can put on shafts

Pulley

Gear

Flywheel

Propeller

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12

3 types of posatie drive connections

Pin

Key

Splined shaft ( shaft with build in keys)

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13

3 Type of pin connections

Cylindrical

Taper

Roller

<p>Cylindrical</p><p>Taper</p><p>Roller</p>
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14

4 Type of Keyed connections

Plain

Taper

Gibhead

Woodruff

<p>Plain</p><p>Taper</p><p>Gibhead</p><p>Woodruff</p>
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15

3 types of friction Drive connections

Interference

Taper

Clamping

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16

Belt drive vs chain drive ( torque and speed )

Belt drive - High speed , low torque

Chain drive - Low speed , High torque

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17

The 3 main types of drive belts

Flat belt

Vee belt

Toothed / timing belts

<p>Flat belt</p><p>Vee belt</p><p>Toothed / timing belts</p>
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18

Rank the belts in order of which requires the most pretention

1(most) - Flat belt

2 - Vee belt

3 - Toothed belt

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19

Belt Vs chain drive pros and cons

knowt flashcard image
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20

What are the two types of bearings

Rolling Element bearing

Plain bearing

<p>Rolling Element bearing</p><p>Plain bearing</p>
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21

The 2 types of loads on bearings

Radial

Thrust

<p>Radial</p><p>Thrust</p>
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22

Types of Lubrication

Partial lubrication :

  • Boundary - Oil or grease

  • Dry - Graphite powder

Film Fluid Lubrication ( no contact between shaft and bearing ) :

  • Hydrostatic

  • Hydrodynamic

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23

What’s the difference between hydrostatic and hydrodynamic lubrication ?

  • Hydrostatic uses a pressurized fluid to ensure no contact all the time

  • Hydrodynamic requires the shaft to rotate at high ish speeds for no contact

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24

Which is typically made out of a harder mateiral, bearings or shaft?

Shafts , typically made from hardened steel

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25

What should the ratio of bearing length to diamiter be

Length should be 1 to 1.5 x the diameter

L = 1.5D

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26

What is the PV value of a bearing and what ‘safety factor’ should be included when choosing a bearing with a PV value

PV value = the pressure x velocity the shaft will experience

Safety factor of x2. E.g. use a bearing of PV value 2x what it requires

<p>PV value = the pressure x velocity the shaft will experience</p><p>Safety factor of x2. E.g. use a bearing of PV value 2x what it requires</p>
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27

Selecting bearing from PV chart

knowt flashcard image
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28

For a rolling element bearing ( like a ball bearing ) are the contact stresses high or low?

High as force is through a small area

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29

Single row deep groove ball bearing can it take:

  • Radial Loads?

  • Axial/thrust Loads?

  • Misalignment ?

Takes Radical loads

Can take some small Axial loads

Cannot take misalignment - will seize up

<p>Takes Radical loads</p><p>Can take some small Axial loads</p><p>Cannot take misalignment - will seize up</p>
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30

What type of cylindrical rollers are there for bearings?

Cylindrical roller

Taper roller

Needle roller

Spherical roller ( symmetrical and asymmetrical)

<p>Cylindrical roller</p><p>Taper roller</p><p>Needle roller</p><p>Spherical roller ( symmetrical and asymmetrical) </p>
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31

Cylindrical roller bearing ( basic type ) can it take:

  • High or low radial loads?

  • Thrust loads?

Can take high radial loads

Cannot take thrust loads

<p>Can take high radial loads</p><p>Cannot take thrust loads</p>
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32

Needle roller bearings radial and thrust load capacity

Can take radial loads

Low thrust load capacity

<p>Can take radial loads</p><p>Low thrust load capacity</p>
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33

Taper roller bearing radial and thrust load capacity

Good Radical load capacity

Can withstand thrust loads in one direction

<p>Good Radical load capacity</p><p>Can withstand thrust loads in one direction</p>
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34

What type of rolling element bearing can only withstand thrust loads?

Thrust roller bearing

<p>Thrust roller bearing</p>
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35

Bearing life- what do these mean:

  • Basic static load rating

  • Basic dynamic load rating

  • Rated life

  • Basic static load rating - Maximum radial load of non rotating bearing

  • Basic dynamic load rating (C) - constant radial load (P) which it can withstand for 1 million revolutions

  • Rated life - number of revolutions bearing expected to last

L10 = number of revolutions

<ul><li><p>Basic static load rating - Maximum radial load of non rotating bearing</p></li><li><p>Basic dynamic load rating (C) - constant radial load (P) which it can withstand for 1 million revolutions </p></li><li><p>Rated life - number of revolutions bearing expected to last</p></li></ul><p>L10 = number of revolutions</p>
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36

Plain vs rolling element bearing

<p></p>
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