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Transmissions Flashcards

1
Q

Primary Function of a Transmission

A

Provide driving force from main propulsion machinery casting the ship to move, allow ahead and astern movement, isolate or combine prime movers.

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2
Q

Secondary Trans function?

A

Lube gears and bearings, support shaft line components, maintain watertight integrity

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3
Q

Type of reduction for slow engines?

A

Single reduction to allow correct prop speed without cavitation

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4
Q

Type of reduction for high speed?

A

Double reduction due to reduced weight and size of gearing

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5
Q

Journal bearing defects?

A

Dirty oil, water in oil, lube supply failure, incorrect oil, incorrect fitting, manufacture faults

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6
Q

Lube oil functions?

A

Minimise friction and wear, remove heat, cushion gear teeth from shock loads, reduce noise, prevent corrosion

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7
Q

How to reduce friction?

A

Reduce load, use dissimilar metals, good surface finish, separate contact faces with oil

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8
Q

OX meaning?

A

Misc oil, synthetic.

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9
Q

Diff between clutch and coupling?

A

Couplings join 2 shafts together until required uncoupling for maintainable. Clutches allow engagement and disengagement of shafts

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10
Q

Couple on t23 spey?

A

High speed meta stream flexible coupling

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11
Q

Advantages of flexible couplings?

A

Allow misalignment, reduce noise, provide vibration dampening

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12
Q

How is the shaft coupled?

A

SKF Supergrip bolts. Better due to tapered ends. Expansion sleeve is used, one nut hydraulically tensioned and other is hand tightened, pressure is released on tensioner.

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13
Q

Stern seal components?

A

Mounting ring, bellows, face carrier, split o rings

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14
Q

Point of quill shaft?

A

Long solid shaft flanged at each end. Capable of twisting which is able to absorb all deflections from the primary train.

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15
Q

Explain single tandem and dual tandem

A

Single: 1 Quill shaft connecting input and output. Heavy load placed on primary pinion.
Double: 2 Quill shafts, 2 primary wheels. Less load on pinion, so can be smaller and lighter. Increase in power.

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16
Q

Lubrication in a journal bearing?

A

Full fluid film or hydrodynamic lubrication

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17
Q

Causes of hydrodynamic failure?

A

Slow rotation speed, shaft misaligned, overloaded bearing, damaged bearing.

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17
Q

Requirements for hydrodynamic lubrication?

A

Surfaces must be in motion to each other, tapered clearance between surfaces, good oil supply, correct viscosity to support load.

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18
Q

Where else is hydrodynamic lubrication found?

A

Tilting thrust bearings

19
Q

4 features of SSS clutch?

A

Only engages when synced, minimal engagement effort, only transmits torque when fully engaged, can’t be locked until fully engaged.

20
Q

If input speed is faster than output speed, how is the SSS clutch engaged?

A

Transient brake automatically applies to input to below the speed of the output. Brake is released allowing acceleration of input back up to allow soft engagement.

21
Q

Gearbox auxilaries?

A

Transient brake; turning gear, top up pump, dehumidifier,control instruments, tacho and encoders, clutch control unit

22
Q

Function of bearings?

A

Support axial or radial load

23
Q

Types of bearings?

A

White metal, roller, ball bearings, journal, thrust

24
Q

White metal used?

A

TALC - Tin, Antimony, Lead, Copper. Shell Journal bearing and thrust pads.

25
Q

White metal characteristics?

A

Low meeting point to shear if overheating, prevents seizure and generation of hotspots, ensures wear on white metal not expensive and difficult to replace component.

26
Q

Max bearing temps?

A

Oil 75C
Bearing 130C

27
Q

Indications of bearings failure?

A

High vibration or noise, steel or debris in filters, reduced run down times, hot oil smell

28
Q

Why is the shaft earthed?

A

Extends cathodic protection to the prop, prevents micro pitting, serves as a short circuit.

29
Q

Label plummer block

A

Oil filter, cooling fins, oil scraper ring, bearing pads, oil, water cooling, oil thrower rings

30
Q

Purpose of plumber block?

A

Supports the shaft

31
Q

When is the turning gear operated and why?

A

To rotate the complete transmission system from GT to prop providing clutch is in. Slow rotation. Dry dock, maintainance

32
Q

What is fluid coupling?

A

Hydrodynamic device transmitting rotary power. Impeller and a runner on a driven shaft. No mechanic connection between the two shafts, fluid couples it

33
Q

Thrust block purpose?

A

Transfers thrust to ships hull

34
Q

Thrust block defects?

A

Dirt wears. Loss of oil pressure increases pad temperature. Stannic oxide corrosion, coating on journal bearings, overloading during towing or power changes

35
Q

Bulkhead gland purpose?

A

Internal bulkhead watertight integrity, 10 degrees distortion each side.

36
Q

Advantages of Vulcan coupling?

A

Low radial and axial stiffness, absorbs shock loads, shears away, large misalignment allowed, low noise

37
Q

Disadvantages of Vulcan coupling?

A

Heavy due to bolts, maintainance

38
Q

Name 4 clutches?

A

Dog, cone, SSS, plate

39
Q

Label shaft line?

A

Propeller, main A bracket, rope guard, intermediate A bracket, SKF coupling, aft intermediate shaft, stern seal gland, earthing ring, aft plumber bearing, Fwd intermediate shaft, bulkhead gland, tortion meter, disc brake, fwd plumber bearing

40
Q

2 drive configurations?

A

IEP/ CODLAG

41
Q

What is pre loading?

A

An initial torque on the shafts so all the teeth are in contact. Locked train

42
Q

How is the main shaft brake applied?

A

Hydraulic air

43
Q

Name bearing failure modes

A

Lube breakdown
Corrosion
Brinelling
Fretting
Rolling Contact Fatigue
Cage wear
Pitting

44
Q

Advantages of anti friction bearings?

A

Good efficiencies, superior at low speeds

Transmissions (1 decks)

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