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
What’s the benefits of hypoid gears
Quiet and smoother
26
Where are worm gears used in aircraft
Flap or trim systems
27
What’s the purpose of a rack and pinion gear
Converts rotational movement into linear
28
Where are planetary gears used
In reduction gearing in aircraft systems
29
What is backlash
The term used to describe the clearance between the gear teeth and the meshing point
30
What’s the restrictions regarding flat belts
They can’t carry heavy loads or power due to slippage
31
What’s the advantages of synchronise belts
They are non slip Low maintenance requirements Don’t require lubricant
32
What type of chain is used on the aircraft regularly and why
Roller chains as leaf chains don’t have s good strength
33
What’s the advantage of chains over pulleys
Chains provide non Slip
34
What’s the disadvantage of chains over pulleys
They are heavier more expensive and noisier