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Gears > Gearing > Flashcards

Gearing Flashcards

1
Q

What does hearing refer to?

A

A system of moving parts

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2
Q

What is a gear train?

A

Made up of a number of gears

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3
Q

3 types of gears

A

Driver
Driven
Idler

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4
Q

What are the 4 primary functions of gears?

A

Transfer drive
Change direction of rotation (same plane)
Change direction of rotation (different angles)
Change speed of rotation

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5
Q

2 types of cut on gears

A

Straight

Helical

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6
Q

Where are straight cut gears usually used?

A

Pumps

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7
Q

What are straight cut gears prone to?

A

Wear

Single point loading

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8
Q

Helical cut gears can produce?

A

Heavy axial loading

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9
Q

Two helical cut gears inherently want to what?

A

Drive apart

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10
Q

How do we stop helical gears driving apart?

A

Introducing an opposing cut to ensure gears remain in mesh

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11
Q

Two types of gears used in helicopters?

A

Spur

Bevel

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12
Q

When are internally toothed spur gears used?

A

Change of speed but not axis of drive

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13
Q

When are externally toothed spur gears used?

A

Change of speed when shafts are parallel

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14
Q

What teeth in Spur gear?

A

Straight & helical

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15
Q

When are bevel gears used?

A

Drive transmitted at an angle

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16
Q

Teeth used in a bevel gear?

A

Straight & helical

17
Q

What is a hypoid gear?

A

When axes of shaft do not intersect

18
Q

Purpose of reduction gear train?

A

Keep rotor speed in efficient operation
Without reducing peak performance of engine

Epicyclic gear

19
Q

What makes up epicyclic reduction gear train

A

Spur sun wheel driven by main

Driving three even spaced planets

Plants mounted on planet carrier

Planets rotate independently

Plants mesh with annulus (internally toothed)

20
Q

Epicyclic gears achieve what?

A

Smaller size for gear box

21
Q

Two types of gear profile

A

Involute

Convolute/Conformal

22
Q

Involute gear form

A

Driver & driven same

23
Q

Pros of involute

A

Easier to manufacture

24
Q

Disadvantage of involute

A

Low surface area contact, high point loads

25
Q

Pros of conformal gears

A

Has area contact enabling higher loads

26
Q

What is backlash?

A

Space to allow for lube & expansion

27
Q

How is gear ratio calculated?

A

Driven/driver

28
Q

What is a hunting tooth ratio?

A

Stops same teeth meshing together on each revolution. To evenly spread wear

29
Q

Maintenance on gears?

A

Correct level & type of oil
Ensure oil is clean (filter change @ intervals)
Monitor backlash at intervals
Monitor oil at intervals (detect wear particles)

Gears (2 decks)

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