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M6 Richard 2019 > 6.9 Transmissions > Flashcards

6.9 Transmissions Flashcards

1
Q

Physical power transmission from the engine to flight control surfaces is normally done by what?

A

Belts, cables, control chains, chain wheels, pulleys and levers

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2
Q

What is the purpose of chains

A

They provide a strong positive connection, generally used where change in direction is necessary and in runs where considerable force is exerted

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3
Q

How is change in direction achieved

A

By chainwheels and pulleys

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4
Q

What systems may chains be found in

A
  • Control column installations
  • Aileron or elevator control
  • Trim Control Systems
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5
Q

Can chains be used with other forms of transmission

A

They can be used on their own or in conjunction with cable assemblies

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6
Q

How is the incorrect assembly of chains made impossible

A

By the use of non reversible chains

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7
Q

How are chains classified

A

By their pitch, roller diameter and width between plates

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8
Q

What component allows a chain to have a 90° change in direction

A

A bi planer block

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9
Q

What type of tower transmission are chains used for

A

Non slip power transmission

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10
Q

How many teeth should be the minimum on a chain wheel and why

A

12, otherwise wear of the chain will be too high

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11
Q

What type of chains require little maintenance

A

Roller chains

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12
Q

What chains are virtually silent in operation

A

Gear chains

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13
Q

How many teeth should be the minimum on gear chain wheels with regards to wear

A

17

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14
Q

What are couplings used for

A

They are used to connect 2 shafts together

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15
Q

What are the 3 types of couplings

A
  • Solid
  • Movable and dissconnectable
  • Safety couplings
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16
Q

What are the best known solid couplings

A

Sleeve couplings

Disk couplings

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17
Q

What is achieved by using solid couplings

A

A rigid connection between 2 shafts

18
Q

What are movable couplings used for

A

Used for shafts that may not be in alignment or if the position of the shafts change with operation

19
Q

What is the purpose of extension couplings

A

They allow for a small amount of longitudinal movement

20
Q

What is the purpose of using universal joints

A

They can transfer a strong force, like used in cars

21
Q

To gain mechanical advantage when using gears what gear must have a different amount of teeth

A

The drive gear

22
Q

What is the purpose of toothed wheel gears

A

They transfer rotational movement at low speeds with out slip

23
Q

How would noise be reduced in toothed-wheel gears

A

They should have ground tooth flanks and should operate in an oil bath

24
Q

How are accidents avoided in toothed-wheel gear runs

A

They are covered with protection devices which also prevent contamination

25
Q

Why are spur gears used

A

When a change in speed is required and the shafts lie parallel to each other

26
Q

When are internal spur gears used

A

When a change in speed is required whilst maintaining overall minimum diameter

27
Q

What is the smallest set of spur gears referred to

A

The pinion

28
Q

What are helical gears used for

A

To transmit drive between parallel shafts (like spur gears)

29
Q

What is the difference with helical gears over spur gears

A

Helical gears are more complex to manufacture, but quieter than spur gears and helical gears have a larger contact area

30
Q

What is the purpose of a rack and pinion

A

Transfers rotational movement into linear movement

31
Q

What is the main benefit of the worm gear

A

High mechanical advantage

32
Q

What angle should herringbone gears not exceed

A

20°

33
Q

What is the purpose of backlash

A

Allows for expansion and lubrication

34
Q

What is a pinion

A

It is the smaller of 2 mating gears

35
Q

What is a lay shaft

A

A shaft which supports an idler gear

36
Q

What is a step up drive

A

Provides an output drive higher than the input

37
Q

What is a compound gear

A

A gear wheel with more than one driving face

38
Q

What is the purpose of a planetary/elliptical gear

A

Used to reduce the speed of the aircraft engines output shaft to the propeller

39
Q

What is the major disadvantage of a stepped pulley drive

A

They can take up a lot of space

40
Q

What type of loads can the drive gear type key transfer

A

Small forces at slow rotational speeds

41
Q

What type of forces can push rods transmit

A

Pull and push forces

42
Q

What are push rods used to operate

A

Rudders, flaps etc

M6 Richard 2019 (10 decks)

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