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M6 Resit > 6.9 Transmissions✅(2) > Flashcards

6.9 Transmissions✅(2) Flashcards

1
Q

What are the benefits of gears used in conjunction with bearings and shafts

A
  • transmit power and increase or decrease rotational speed
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2
Q

Which gear is the most popular type for precision cylindrical gears

A

Spur gears

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3
Q

What is the advantage of a spur gear

A
  • easy to manufacture
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4
Q

What is the disadvantage of a spur gear

A
  • noisy in operation
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5
Q

When 2 spur gears of different sizes mesh together, what is the larger gear called

A
  • wheel (spur)
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6
Q

When 2 spur gears of different sizes mesh together, what is the smaller gear called

A
  • Pinion
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7
Q

What is a spur gear

A
  • straight teeth parallel to the shaft’s axis and connect parallel shafts only
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8
Q

In a spur gear, what is the external teeth used for

A
  • change of speed is required, and the shafts are parallel to each other
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9
Q

In a spur gear, what is the internal teeth used for

A
  • when a change of speed is required whilst maintaining a overall minimum diameter
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10
Q

Advantage of helical cut (spur gear)

A
  • carry heavier loads at higher speeds
  • run more smoothly and quietly
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11
Q

Where are bevel gears used between

A
  • intersecting shafts and can be designed for any angle of intersection
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12
Q

example of a bevel gear

A

main drive shaft of an aircraft engine to drive the accessory gearbox

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13
Q

Advantages of bevel gears

A
  • quieter and smoother in operation
  • carry greater loads
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14
Q

Is hypoid gears or spiral bevel gears more quieter and smoother in operation

A
  • hypoid gears
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15
Q
  • Which gear suffer from heavy sliding contact and require extreme pressure lubricant
A

hypoid gears

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16
Q

Advantages of worm gears

A
  • quiet
  • carry heavy loads
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17
Q

worm gears are inefficient compared to other gears due to the large sliding movement of their teeth (T or F)

A
  • T
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18
Q

What does a worm wheel offer in a worm gear

A
  • offer high reductions in single steps
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19
Q

Where would a worm gear be used

A
  • aircraft flap control systems
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20
Q

What is a rack and pinion system used to transmit

A

motion between a rotating spur gear and linear toothed rack

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21
Q

What does rack and pinion system convert

A

rotational motion into linear motion

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22
Q

Where would a rack and pinion be often used on

A
  • leading edge flaps for extension and retraction
23
Q

A gear is a toothed wheel that, when operated, transmits motion from one shaft to another (T or F)

A

T

24
Q

Which gear is the small gear in a mechanical advantage system

A

drive gear

25
Q

Which gear is the large gear in a mechanical advantage system

A

driven gear

26
Q

What is the gear ratio formula

A

number of teeth on driven gear/number of teeth on drive gear

27
Q

How do you calculate speed ratio

A

input speed/speed ratio

28
Q

What are Idler gears also named as

A
  • Intermediate gears
29
Q

Where would you use a idler gear

A
  • Used between 2 gears
30
Q

Does the presence of an idler gear make a difference to the ratio of speed between input and output

A

no

31
Q

A reduction gear is an arrangement by which an input speed can be lowered to obtain a slower output speed with the same or equivalent output torque (T or F)

A

T

32
Q

What is primarily used to reduce gearing in aircraft engines

A

Epicyclic, or planetary gears

33
Q

What is backlash

A

clearance between gear teeth at the meshing point

34
Q

What does excessive backlash indicate

A

worn gearing

35
Q

What is a belt drive used for

A
  • change the speed of rotation
36
Q

What is a belt

A
  • loop of flexible material used to mechanically link or drive 2 or more rotating shafts
37
Q

What is a friction drive belt

A
  • relies on friction between belt and pulley to transmit power
  • requires correct tension
38
Q

What is a positive drive (synchronous) belts

A
  • relies on teeth engagement on belt with grooves on pulley
39
Q

What are modern day belts made out of

A
  • nylon
  • aluminium with reinforced, rubberised fabric
40
Q

Flat belts are not advisable for high outputs at high speeds (T or F)

A

T

41
Q

Advantages of V-belts

A
  • low cost
  • easy installation
  • wide range of sizes
42
Q

What is the operational advantage of a V-belt

A
  • wedging action into the pulley groove
43
Q

When were synchronous belts first introduced

A

1940

44
Q

What are synchronous belts also known as

A

timing belt

45
Q

What are V belt pulleys solely used for

A
  • transmitting power between 2 parallel axis
46
Q

What are leaf chains

A
  • simple form of steel chains, consisting of link plates and pins
  • very strong
47
Q

Advantage of chain drives

A

chain cannot slip on the sprocket because of the teeth

48
Q

Disadvantage of chain drive

A
  • heavy, noisy, more expensive than belt pulley system drive system
  • Used where slipping must not occur
49
Q

How is a sprocket locked to the shaft

A
  • by the use of a keyway or grub screw
50
Q

Chains are only used where slipping must not occur (T or F)

A

T

51
Q

What is a sprocket

A

Toothed wheel that fits onto a shaft

52
Q

Leaf chains must be used for low or high speed applications?

A

Low speed

53
Q

Leaf chains or chain drive cannot slip?

A

Chain drive as they have teeth

54
Q

Flat belts are not advisable for high outputs at high speeds (T or F)

A

T

M6 Resit (10 decks)

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