M6.9 Gear Types And Applications Flashcards

1
Q

What type of teeth do spur gears have?

A

Straight teeth

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2
Q

What the main disadvantage of spur gears?

A

Noisy

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3
Q

How are the shafts different in external spur gears?

A

They are parallel

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4
Q

What is the advantage of internal spur gears?

A

Space saving

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5
Q

What are the 2 main advantages of Spur gears - helical cut?

A

. Quieter
. Greater loads

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6
Q

What is the main advantages of bevel gears?

A

. Intersecting axis
. Heavy loads

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7
Q

What is a disadvantage of hypoid gears?

A

Can slide ( require constant pressure )

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8
Q

What are worm gears used in?

A

Flap/trim tab systems

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9
Q

What is the statement about Rack and pinion gears?

A

Rotational to linear movement

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10
Q

What is the name of the ratio to do with MA?

A

Teeth ratio

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11
Q

What is speed ratio opposite to?

A

MA

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12
Q

What is the idler gear?

A

Sits between drive and driven gear

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13
Q

What is backlash in gears?

A

. Clearance between gear teeth
. Allow for expansion

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14
Q

What direction does a drive pulley go?

A

One direction

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15
Q

What does a friction belt rely on?

A

Friction and tension

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16
Q

What is a positive drive belt?

A

. Teeth on belt match grooves on pulley
. Means no slip

17
Q

What is not needed with flat belts?

A

Tension as have high friction

18
Q

What are advantages of V-belts?

A

. Low cost
. Various sizes
. Pulley grooves

19
Q

What is a v-ribbed belt?

A

Combines good factors of flat belt and v-belts

20
Q

What are the advantages of a synchronous pulley?

A

. Non slip drive
. Non lubricated
. Long life
. Quiet
. Low maintenance

21
Q

What do roller chain/sprockets both have?

A

Positive non slip drive

22
Q

What’s the benefit of an internal spur gear over a external spur gear

A

Internal spur gears save space

23
Q

What’s the negative of helical gears

A

They’re harder to manufacture

24
Q

Why are bevel gears used

A

When a drive needs to be transmitted between different axis

25
Q

What’s the benefits of hypoid gears

A

Quiet and smoother

26
Q

Where are worm gears used in aircraft

A

Flap or trim systems

27
Q

What’s the purpose of a rack and pinion gear

A

Converts rotational movement into linear

28
Q

Where are planetary gears used

A

In reduction gearing in aircraft systems

29
Q

What is backlash

A

The term used to describe the clearance between the gear teeth and the meshing point

30
Q

What’s the restrictions regarding flat belts

A

They can’t carry heavy loads or power due to slippage

31
Q

What’s the advantages of synchronise belts

A

They are non slip
Low maintenance requirements
Don’t require lubricant

32
Q

What type of chain is used on the aircraft regularly and why

A

Roller chains as leaf chains don’t have s good strength

33
Q

What’s the advantage of chains over pulleys

A

Chains provide non Slip

34
Q

What’s the disadvantage of chains over pulleys

A

They are heavier more expensive and noisier