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HET 4 > HET 4 Gearing Principles > Flashcards

HET 4 Gearing Principles Flashcards

1
Q

3 types of gears

A

Straight cut (spur gear) (Radial)

Helical cut

Double helical (Herringbone)

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2
Q

True or false:
Gear teeth may be parallel or tapered with one large end and one small end

A

True

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3
Q

Name 4 distinctive quadrants of a gear tooth

A

Face
Flank
Heal
Toe

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4
Q

The gear pitch line divides what gear tooth areas

A

Face and Flank

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5
Q

Gap between tip of one gear tooth and root of opposite gear

A

Clearance

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6
Q

Why do some angle drive gear sets need to be timed

A

For consistent Wear Pattern

Longevity

Noise

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7
Q

3 types of gear configurations

A

Reduction

Overdrive

Direct drive

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8
Q

If a gear set has a 4:1 ratio, which member is turning at 4 revolutions

A

Drive (Input) member

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9
Q

What would a reduction ratio look like

a) 0.10:1
b) 1.00:1
c) 10.00:1
d) 1.00:2

A

c) 10.00:1

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10
Q

What does an idler gear do

A

Change direction of driven gear

Allows reverse to be possible

Does not effect speed or torque

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11
Q

3 types of tooth designs

A

Straight cut (Spur) (Radial)

Helical cut

Double helical (Herringbone)

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12
Q

Common gear set where internal gears are used

A

Planetary gear sets

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13
Q

Another name for double helical gears

A

Herringbone gear

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14
Q

What type of thrust do straight and helical gears create

A

Straight: Radial thrust

Helical: Radial and Axial thrust

Double helical cancel axial thrust

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15
Q

3 main components of planetary gear sets

A

Internal gear (Ring gear)

Planet carrier / planet pinion

Sun gear

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16
Q

Another word for gear Face and gear Flank

A

Face: Top land

Flank: Bottom land

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17
Q

Name of Top and Bottom of gear tooth

A

Top: Tip

Bottom: Root Fillet

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18
Q

Which side of a bevel gear is the drive and coast side

A

Drive: Convex

Driven: Concave

19
Q

What is happening if you can’t get your PTO backlash set correctly

A

It’s the wrong PTO, Gear tooth pitch is different

20
Q

Gear tooth Clearance purpose

A

Maintains Lubrication

21
Q

What is Backlash

A

Ensures there is enough room for gear tooth Expansion and lubrication

22
Q

Non-Hunting gears

A

Must be timed

Has a specific tooth contact each revolution

23
Q

Partial Non-hunting gears

A

Every 2 or 3 revolutions before returning to original starting mesh

24
Q

Hunting gears

A

Each and every tooth will come into contact at some point in operation

25
Q

Explain a Reduction

A

Small gear Drives a big gear

Increased torque, decreased speed

E.g: 6:1

26
Q

Calculation for gear teeth ratios

A

Driven over drive

27
Q

Explain Overdrive gear sets

A

Big driving a small

Increased Speed, decreased Torque

E.g: 0.7:1

28
Q

Straight cut gears are also called

A

Spur gears

29
Q

If a gear tooth has one larger and smaller end, what are they called

A

Larger: Heel

Smaller: Toe

30
Q

Benefits/ disadvantages of a Straight cut gear (Spur Gear)

A

Inexpensive

Thrust bearings not required

Can be noisy

Often used to drive power takeoffs (PTOs)

31
Q

Where are Internal gears often used

A

Planetary gear sets

32
Q

3 Members of a planetary gear set

A

Held gear

Drive gear

Driven gear

33
Q

Double helical gear Adv/Disadv

A

Axial thrust loads are offset by one another

Very strong

Expensive

34
Q

Main purpose of rack and pinion gears

A

Change Rotary motion to liner

35
Q

Angle drive gears do what

A

Change the direction of path of power

36
Q

Hypoid Gears are

A

Common in trucks

Below bevel gear centre

Strong, more tooth surface in contact

Need proper Oil because of heavy loads

37
Q

Amboid Gears are

A

Above bevel gear centre line

Not as common

Used in off-road for ground clearance

38
Q

What is a Over hung Pinion shaft

A

Overhung: 2 bearings

39
Q

What is a Strattle mount pinion shaft

A

Strattle mount: 3 bearings, stonger

40
Q

What is a worm gear set

A

Very strong
Expensive
High torque (winches)

41
Q

In a planetary, what is the held member also referred as

A

Reactionary member

42
Q

When any 2 members are held in a planetary what is the outcome

A

Direct drive

43
Q

What is the planetary shaft called that goes into the diff

A

Quill Shaft

HET 4 (2 decks)

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