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Heavy Equipment Technician Period 3 Alberta > 190303A > Flashcards

190303A Flashcards

1
Q

What divides a gear tooth lengthwise?

A

Pitch line

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2
Q

What is the larger end of a gear tooth called?

A

Heel

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3
Q

What is done to a root fillet to increase strength?

A

The fillet is slightly rounded

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4
Q

When describing Path-of-Power where is power coming from and traveling too?

A

From the engine flywheel to the drive axles

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5
Q

When an engine is not delivering power what side of the gear tooth is being used?

A

Coast side or Concave side

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6
Q

What are three diameters of a pitch circle that can be measured?

A

Root, Pitch and Outside circle

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7
Q

Which circle is used to determine circular gear pitch?

A

Pitch Circle

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8
Q

Why is it important for gears to have the same circular gear pitch?

A

With the same circular gear pitch the gears relationship is strong and the most force can be transmitted through the gears.

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9
Q

What is done to the outside surface of a gear?

A

Hardened

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10
Q

True or false: Clearance provides space for lubrication between teeth?

A

True

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11
Q

True or false: Gear teeth should always be in tight contact

A

False: backlash is needed to allow room for expansion

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12
Q

What tool is usually used to measure backlash?

A

Dial indicator

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13
Q

What should you be aware of when changing backlash?

A

The wear that occurs on gear teeth

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14
Q

When two gears are in mesh what is the smallest gear referred as?

A

Pinion Gear

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15
Q

The crown gear is also know as?

A

The ring gear

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16
Q

True or False: All gear sets must be timed?

A

False: only non-hunting and partial non-hunting gear sets must be timed.

17
Q

Are wear patterns are always the same on gear sets?

A

No. non-hunting, hunting and partial non-hunting gear sets will have different wear patters,

18
Q

How many revolutions does it take for pinion gears to return to the original spot on a partial non-hunting set?

A

More than one full revolution.

19
Q

What is unique about a hunting gear set ration?

A

there will be multiple decimal points.

ie. 3.44444:1

20
Q

What changes in speed and torque when a direct drive occurs?

A

The output speed and torque will be the exact same as the input speed and torque

21
Q

What is the formula to find a gear ratio?

A

driven teeth divided by drive teeth

22
Q

What is a reduction also known as?

A

Underdrive

23
Q

Does the input make more or less revolutions than the output gear during a reduction?

A

The input (Drive) gear will have to make more revolutions than the output (driven) gear.

24
Q

What decreases during a reduction?

A

Output Speed

25
Q

How can you create more torque on an output gear?

A

Reduction/Overdrive

26
Q

If input is driving at 1000RPM, in a 2:1 reduction. How fast is the output being driven?

A

500RPM

27
Q

Two external gears turn which direction in relation to eachother?

A

The girls will turn in opposite directions

28
Q

Is the drive gear larger or smaller than the driven gear in a overdrive situation?

A

The drive gear will be larger

29
Q

True or False: In an overdrive situation, output speed will decrease and output torque will increase

A

False. In an overdrive output speed increases while torque decreases

30
Q

How can you change direction on a driven gear without changing the input direction?

A

By adding an idler

31
Q

Do idlers change speed and torque outputs in basic gear sets?

A

No idlers only change direction

32
Q

What type of thrust(s) are created when two spur gears are in mesh?

A

Radial thrust, the gears are trying to push eachother apart

33
Q

Is axial or radial thrust created by helical cut gears?

A

Axial thrust is created

34
Q

What can be used to offset axial thrust loads?

A

Thrust washers or bearings

Also a second helical cut gear can be used

35
Q

Why are straight cut gears used more in off-road applications than on-road applications?

A

Straight cut gears are larger to be strong. Larger gears are heavier, so they will have less affect on the performance of large off-road equipment

36
Q

External gears have teeth facing the inside of the gear?

A

No, external gears have teeth facing out

37
Q

Internal gears are a weaker gear?

A

No, internal gears can be very strong

38
Q

If an external gear is meshed with a internal gear, with the internal gear turning clockwise. Which way will the external gear travel?

A

Clockwise also.

39
Q

Herringbone gears are also known as single helical gears?

A

No. Herringbone gears are a double helical cut gear

Heavy Equipment Technician Period 3 Alberta (15 decks)

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