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Heavy Equipment Technician Period 4 > HET 4 GEARING > Flashcards

HET 4 GEARING Flashcards

GEARING PRINCIPLES 190401C

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1
Q

What are components of a gear tooth?

A

Face, Flank, Heel and Toe

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2
Q

Is the concave side or the convex side the drive side?

A

Convex side is a drive side

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3
Q

The larger end of a gear is the?

a) heel
b) toe
c) face
d) flank

A

Heel

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4
Q

What is special about the root fillet area?

A

Its rounded, to give strength

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5
Q

When the is off the throttle and is in a coasting moment, what happens to the drive and driven side of a gear?

A

The opposite side becomes the driven, concave is drive and convex is driven

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6
Q

What three circles are measurable in on a gear?

A

Root
Pitch
Outside

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7
Q

What needs to be found before the circular gear pitch can be determined?

A

Pitch circle

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8
Q

If the gears in mesh have the same circular gear tooth pitch, what does it achieve?

A

Greatest strength

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9
Q

The clearance between the root and tooth tip of two gears is there for what reason?

A

To provide a space for lubrication

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10
Q

Why are gears not installed in tight contact?

A

No room for expansion during operation

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11
Q

What tool is used to measure backlash?

A

Dial indicator

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12
Q

When gears have run together for a long time what can happen?

A

change in tooth profile/shape, gears have worn into eachother

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13
Q

What types of timing are possible with gears?

A

Hunting, Non-Hunting and Partial Non-Hunting

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14
Q

Why are timing marks important in a non-hunting gear set?

A

The timing marks must line up - proper timing - longer service life

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15
Q

What type of timing design would a gear set be if the ratio is 5:1?

A

Non-hunting

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16
Q

What type of timing design would a gear set be if the ratio is 8.5:1?

A

Partial non-hunting

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17
Q

What type of timing design would a gear set be if the ratio is 3.89:1?

A

Hunting

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18
Q

Describe hunting gear sets?

A

No specific wear pattern is created, every tooth in one gear will touch every tooth in the other gear, no timing

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19
Q

If a few teeth on one gear constantly mesh with only a few teeth on another gear, the gears are timed or not?

A

Timed - non or partial non hunting

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20
Q

Which type of gear timing has the most distinctive wear pattern?

A

Non-hunting

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21
Q

When two external gears are in mesh what is produced?

A

A reverse

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22
Q

What is the speed difference between input and output gears when they are identical size?

A

No speed differences

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23
Q

Why is path-of-power important to understand when looking at gears?

A

Helps determine gear ratios, troubleshoot faults

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24
Q

Gear rations are written in relation to drive and driven gears, in a 1:2 ration which is driven and which is drive?

A

1 is drive and 2 is driven

25
Q

To find the gear ration what is divided or multiplied?

A

Driven is divided by drive
Driven over Drive
Driven (24) ÷ Drive (12)

26
Q

If a gear starts to show blue colouring what could be the problem?

A

No backlash - No lube - Heat

27
Q

Crankshaft and Camshaft timing is considered which design?

a) hunting
b) non-hunting
c) partial non-hunting

A

Non-Hunting, specific timing

28
Q

If a drive gear rotates twice and the driven gear rotates once, what type of drive is it?

A

Reduction

29
Q

What does an idler do between to external gears?

A

Changes output gear direction of rotation

30
Q

True or False

Idlers are used to change speed and torque?

A

False - only direction of rotation

31
Q

Are gear ratios added together or multiplied?

A

The gear ratios are multiplied against eachother

32
Q

Without an idler what three conditions can two gears run in?

A

Direct drive, Reduction and Overdrive

33
Q

Is it more likely for the pinion gear to be the drive member or the crown gear?

A

Pinion gear is usually the drive gear

34
Q

What are three types of external gears?

A

Spur/straight cut, helical cut, double helical cut

35
Q

True or False

Internal gears mesh with other internal gears?

A

False

36
Q

What thrust loads are produced by single helical gears?

A

Axial thrust

37
Q

Why are double helical gears great?

A

No/little axial thrust

38
Q

What is a negative feature of a herringbone gear?

A

Cost to manufacture

39
Q

What is commonly the drive (input) in a simple planetary?

A

Sun

40
Q

Tapered roller bearings can handle what types of thrust loads?

A

Axial and radial thrust loads

41
Q

What are the four basic components of a simple planetary?

A

Sun, Planets, Carrier and Ring Gear

42
Q

Direct drive can result if two components are held, what other way can direct drive be created?

A

two components being driven at same RPM

43
Q

Hypoid gears have the pinion above or below the center line of the crown gear?

A

Below the center line

44
Q

In what set up are pinion gears above the center line of the crown gear?

A

Amboi gears

45
Q

In a basic spiral bevel gear set where is the pinion gear in relation to the crown gear center line?

A

Centered with the center line

46
Q

Rack and pinion gears do what with rotary motion?

A

Rotary motion is turned into linear motion

47
Q

What situations are worm gears good for?

A

High Torque loads

48
Q

Is it common to see worm and worm wheel gear sets on a high speed on-highway trucks?

A

No

unless it has a winch!

49
Q

What is the purpose of an amboid gear set up?

A

Driveline is higher - off road

50
Q

Does a hypoid gear set up have more or less tooth contact during meshing, when compared to a pinion that is centered on the crown gear?

A

More tooth contact

51
Q

True or False

Hypoid angle gears are used in LOW torque situations?

A

False, High torque loads

52
Q

Angle gears can have a maximum angle of?

A

90°

53
Q

A reactionary member can also be referred to as a?

A

Held member

54
Q

To have a planetary operate, what conditions must the components be in?

A

one member is a DRIVE
one member is DRIVEN
one member is HELD

55
Q

If none of the members of a planetary are held what condition is created?

A

Neutral

56
Q

Why is extreme pressure lubricant used in hypoid gear sets?

A

Sliding contact and pressure between gear teeth during meshing process is very high

57
Q

Do hypoid gear sets have the same load handing abilities as an amboid gear set?

A

Yes

58
Q

When the carrier is held what is created?

A

a reverse

Heavy Equipment Technician Period 4 (13 decks)

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