7.12 Transmition Flashcards

1
Q

What are advantages of using chains?

A

Flexible, positive connections, change direction

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2
Q

Where may chains be found?

A

Control column installations, aileron and elevator controls, trim control systems

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3
Q

What can chains be used in conjunction with?

A

Cables

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4
Q

What does a roller chain consist of? (Parts)

A

Outer and inner plates, rollers, bearing pins, bushes

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5
Q

What are the 3 roller chain principle dimensions?

A

Pitch, width between inner plates, roller diameter

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6
Q

Describe chain assemblies in terms of lubrication when you buy them

A

Come pre lubricated and shouldn’t be removed

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7
Q

What should you check for after installing a chain?

A

Twists and alignment with socket

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8
Q

How do you prevent backlash when installing a chain

A

Ensure they are not over or under tensioned

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9
Q

How do you prevent a chain from reversing?

A

Use a non reversible chain

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10
Q

How are non reversible chains different to normal chains?

A

Every second outer plate is extended to break the symmetry

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11
Q

What are the 4 parts of inspecting a chain?

A

General, removal, checking articulation, check for deterioration

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12
Q

How do you protect and store a chain?

A

Soaked and appropriately oiled, time allowed for lubricant to penetrate surface, wrapped in grease proof paper

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13
Q

What is a spur gear?

A

Most common, teeth perpendicular to face

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14
Q

What is a helical gear?

A

Teeth at angle to shaft, similar to spur gears

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15
Q

What is a bevel gear?

A

Transfer power between intersecting shafts and uses for any angle up to 180

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16
Q

What are hypoid gears?

A

Similar to bevel gears, teeth are hyperboloid shape

17
Q

What are worm gears?

A

Resemble screws, can drive spur or helical gears

18
Q

How do you prevent corrosion on gears?

19
Q

If a gear cracks what happens to it?

A

It’s replaced

20
Q

What is erosion caused by and how will it affect the gear?

A

Caused by cavitation, will effect gear over long period, will require replacement

21
Q

What can affect backlash?

A

Change in distance, change in thickness, change in temperature

22
Q

What is backlash?

A

The play between mating teeth.

23
Q

Define minimum backlash.

A

Tolerances have shortest centre distance, thickest teeth at highest point

24
Q

Define maximum backlash.

A

When Tolerances have greatest centre distance, thinnest teeth at lowest point

25
What is backlash tolerance?
Allowable amount of backlash
26
What is backlash variation?
Different between minimum and maximum backlash
27
What is the purpose of backlash?
Prevent gears jamming and making contact on both sides of the teeth at the same time
28
What can the amount of backlash be affected by
Changes in centre distances Variance in tooth thickness Temperature ranges
29
What is most commonly used gear
Spur gear
30
What are bi planet blocks
Changing the direction plane of the chain
31
What’s the advantage of worm gears
Mechanical advantage Much larger step down between drive and driven shaft speeds where space is limited