M6.9 Gear Types And Applications

Question 1

What type of teeth do spur gears have?

Answer 1

Straight teeth

Question 2

What the main disadvantage of spur gears?

Answer 2

Noisy

Question 3

How are the shafts different in external spur gears?

Answer 3

They are parallel

Question 4

What is the advantage of internal spur gears?

Answer 4

Space saving

Question 5

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

Answer 5

. Quieter
. Greater loads

Question 6

What is the main advantages of bevel gears?

Answer 6

. Intersecting axis
. Heavy loads

Question 7

What is a disadvantage of hypoid gears?

Answer 7

Can slide ( require constant pressure )

Question 8

What are worm gears used in?

Answer 8

Flap/trim tab systems

Question 9

What is the statement about Rack and pinion gears?

Answer 9

Rotational to linear movement

Question 10

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

Answer 10

Teeth ratio

Question 11

What is speed ratio opposite to?

Answer 11

MA

Question 12

What is the idler gear?

Answer 12

Sits between drive and driven gear

Question 13

What is backlash in gears?

Answer 13

. Clearance between gear teeth
. Allow for expansion

Question 14

What direction does a drive pulley go?

Answer 14

One direction

Question 15

What does a friction belt rely on?

Answer 15

Friction and tension

Question 16

What is a positive drive belt?

Answer 16

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

Question 17

What is not needed with flat belts?

Answer 17

Tension as have high friction

Question 18

What are advantages of V-belts?

Answer 18

. Low cost
. Various sizes
. Pulley grooves

Question 19

What is a v-ribbed belt?

Answer 19

Combines good factors of flat belt and v-belts

Question 20

What are the advantages of a synchronous pulley?

Answer 20

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

Question 21

What do roller chain/sprockets both have?

Answer 21

Positive non slip drive

Question 22

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

Answer 22

Internal spur gears save space

Question 23

What’s the negative of helical gears

Answer 23

They’re harder to manufacture

Question 24

Why are bevel gears used

Answer 24

When a drive needs to be transmitted between different axis

Question 25

What’s the benefits of hypoid gears

Answer 25

Quiet and smoother

Question 26

Where are worm gears used in aircraft

Answer 26

Flap or trim systems

Question 27

What’s the purpose of a rack and pinion gear

Answer 27

Converts rotational movement into linear

Question 28

Where are planetary gears used

Answer 28

In reduction gearing in aircraft systems

Question 29

What is backlash

Answer 29

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

Question 30

What’s the restrictions regarding flat belts

Answer 30

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

Question 31

What’s the advantages of synchronise belts

Answer 31

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

Question 32

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

Answer 32

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

Question 33

What’s the advantage of chains over pulleys

Answer 33

Chains provide non Slip

Question 34

What’s the disadvantage of chains over pulleys

Answer 34

They are heavier more expensive and noisier