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Me150 > Transmission > Flashcards

Transmission Flashcards

1
Q

Two main functions of the ships gearbox

A
  • Change the speed of prime mover

- allow for forwards and backwards

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2
Q

Types of teeth profiles

A

Spur
Helical
Double helical
Worm and wheel

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3
Q

What would spur teeth be used for

A

Low speed
Low torque
They are loud aswell

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4
Q

Positives and negatives of helical teeth

A
  • There cut at an angle so more surface area in contact

- however the angle forces the gears away from eachother

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5
Q

Describe the double helical

A

Two helical gears in opposing direction, cancelling out the dice pushing a single gear away.

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6
Q

Explain the worm and wheel

A

They are not parallel to each other, they form a 90degree
Due to this it allows motion to change directions.
Very large gear reduction is possible

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7
Q

What is the maximum single gear reduction in the Royal Navy

A

15:1

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8
Q

What is a dual tandem

A

Double gear reduction

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9
Q

What is the purpose of a dual tandem

A

It shared the load across two gears

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10
Q

What is the input gear called

A

Primary pinion

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11
Q

What is the driven gear called

A

Primary wheel

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12
Q

Want so quill shafts do

A

Maintain alignment
Made out of spring steel
So acts as a torsion bar so flexes to keep gears pushed together

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13
Q

What are the gearbox ancillaries

A

Shaft breaks
Thrust block
Turning gear

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14
Q

What does the shaft break consist of

A

Break disk on shaft
3 break callipers
2 pads in each calliper

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15
Q

How is the shaft break applied

A

HP air 80-100 bar

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16
Q

Shaft break checks (on application of break)

A
  • Ensure no fire risk
  • All break pads are being applied
  • the shaft is stationary not vibrating
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17
Q

Shaft break tests (break not applied)

A
  • All pads are cleans and released
  • no fire danger exists
  • the shaft is turning
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18
Q

What is the thrust block

A
  • Large thrust bearing
  • At the gearbox end of the shaft
  • absorbs force of the propeller
19
Q

What does the thrust block consist of

A
  • A machined collar on both sides
  • White metal pads
  • lubricated by “Michelle” principle
20
Q

What is the purpose of the turning gear

A

Used to slowly rotate the propeller when going into dry dock

21
Q

What type of gear teeth will be used on the turning gear

A
  • Worm and wheel (worm is always the driving gear)

- mounted on top of gear box case, drives the upper quill shaft

22
Q

Benefits of the turning gear

A

It will self Lock if power is lost, so it’s easy to turn the propeller to the exact point needed

23
Q

Parts of a forced oil lub system

A 
Motor driven pump
Gear driven pump 
Serckstat
Turning valves 
Forced lub cut ins
24
Q

What is the use of a motor driven pump in a forced lub oil system

A
  • Used to prime the gearbox lub oil system
  • can drain the oil
  • can be used as a back up of gear driven pump fails
25
Q

Use of a the gear driven pump (forced lub oil system)

A

Only works when the gearbox is turning Lubs the system

26
Q

What is sercksata (lub oil system)

A
  • Directs hot lub oil through the cooler
  • allows cold oil to bypass
  • oil temp controlled to optimum temp by serckstat using coolers and heaters
27
Q

What do the turning valves do

A

Direct high pressure oil to components that require specific oil pressure

28
Q

What do the forced lub cut ins do?

A
  • If oil pressure drops below 18.5 PSI
  • pressure switch will send a signal
  • the motor driven pump will engage
29
Q

How often are forced lub cut ins checked

A

Every 24 hours

30
Q

What Hazards are associated with the gearbox

A

Noise
Heat
Rotating parts

31
Q

Name the parts of the propulsion transmission

A 
Plummer blocks 
Bulkhead glands 
Stern seals 
A brackets
SKF coupling
32
Q

What is the purpose of the Plummer blocks

A

Used to support the weight of the shaft

33
Q

How does the Plummer block get lubricated

A

Dynamic lubrication

Using oil from a oil bath

34
Q

What are the purpose of bulkhead glands

A

Maintain water tight integrity while letting the shaft pass through compartments. Without absorbing thrust

35
Q

How do bulkhead goads work

A

They have white metal lined bearings.

Lubricated with grease

36
Q

What does the stern seal do

A

Maintains water tight seal as shaft passes out the ship

37
Q

How does the stern seal create water tight seal

A
  • Has a mechanic seal.
  • Also has a inflatable seal for emergency
  • needs shaft tone stationary
38
Q

What do A brackets do

A

-Support the weight of the propeller

39
Q

How are the A brackets lubricated

A

Hydro-dynamic principle

Sea water lubed

40
Q

What holds a skf coupling

A

Mechanical taper

41
Q

How do you separate a skf coupling

A

High pressure hydronic oil forced between two sleeves

42
Q

What connects the thrust shaft to the intermediate shaft

A

Bolted flanges

43
Q

What can controllable pitch propeller do

A

They can alter angle/pitch of propeller blades using hydraulics.

44
Q

What makes up a gear box

A

Shafts
Bearings
Pinions
Wheels

Me150 (6 decks)

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