190303a Flashcards

1
Q

Gear teeth may be parallel to one another or they may be tapered with one large end and one smaller end

A

True

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2
Q

A gear tooth can be subdivided into 4 Distinctive quadrants. Identify the names of each of those quadrants

A

Face
Flank
Toe
Heel

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3
Q

The gear pitch line is used to divide the following gear tooth areas

A

Face and flank

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4
Q

When 2 gears are in mesh, a gap is formed between the tip of one gear tooth and the root In the opposite gear. This gap is called the:

A

Clearance for lubricant

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5
Q

Explain why some angle drive gear sets may need to be timed

A

The gears have been lapped in this pattern and need to be timed to continue this specific relationship

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6
Q

Gears may operate together as direct drive assemblies. identify two other types of gear configuration and explain the type of speed and torques changes that would be expected between the input and output members

A

Reduction. Speed reduction torque increase

Overdrive speed increase torque reduction

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7
Q

If a simple gear set has a gear ratio of 4:1 explain which member is turning at 4 revolutions

A

Drive (input ) member is rotating at 4 revolutions and Driven (output) will be once

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8
Q

Which of the following gear ratios would be a reduction gear ratio?

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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9
Q

When installed between a drive and a driven gear, an idler gear affects speed and torque changes between the two gears

A

False

It will only change the direction of rotation

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10
Q

Explain the purpose of an idler gear

A

An Idler gear is used to change the direction of rotation of the driven gear to the same as the drive gear

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11
Q

Name and explain the tooth design used on 2 types of external gears

A

a) straight cut square gear Teeth cut inline with the mounting shaft
b) Helical gear. Teeth cut at angle to the mounting shaft

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12
Q

Identify one common gearset where internal gears may be used

A

Planetary gear sets

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13
Q

What is another name for a double helical gear?

A

Herringbone gears

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14
Q

Straight cut spur gears and helical gears both produce axial thrust loads during operation?

A

False

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15
Q

Identify the 3 main components of a simple planetary gear set

A

a) Internal gear or ring gear
b) Planet pinions
c) Sun gear

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16
Q

When describing wider gear teeth,what are the three sections across

A

Heel and toe separated by a center section

17
Q

What does the term path of power mean

A

It’s used when describing or tracing any power flow such as from the engine flywheel to the drive axles

18
Q

When gears are used in mobile equipment, such as a highway tractor the drive side gear has what shape?

A

The drive side is convex

19
Q

On some gear designs, a concave shape will be used at what time in the powertrain?

A

When in coast mode. The loaded vehicle is pushing the powertrain

20
Q

What are three gear circles

A

Root, pitch, and outside circles. Each measured across opposite sides of the gear

21
Q

In order to determine circular gear pitch, what must be first established? And second?

A

The pitch circle. Then the distance between the gear tooth centerlines

22
Q

Why do engineers create a space called backlash?

A

To allow for expansion during operation and allow for lubrication

23
Q

If backlash is incorrect what may need to be adjusted

A

Gear mesh

24
Q

Will a worn gear increase or decrease backlash?

A

It will increase and could cause timing issues. Such as crankshaft and camshaft operation

25
Q

What are two gears used in angled drive gear sets

A

The smaller gear known as the pinion gear, and a larger crown, bevel or ring gear

26
Q

Do hunting gear sets have to be timed?

A

No. The number of pinion teeth will not dividing to the crown teeth equally. Different tooth contact and no specific wear pattern

27
Q

What does the addition of an idler gear and shaft assembly create between Drive and driven gears?

A

A rotational direction change. There will be no speed difference or change in torque

28
Q

What’s the purpose of adjusting gear mesh?

A

To achieve a wear pattern that will provide maximum gear set life

29
Q

What are the advantages of straight cut spur gears

A

Cheap manufacturing process, no axial thrust.

30
Q

What are disadvantages of straight cut spur gears

A

Not high-strength units, noisy, load handling ability is limited

31
Q

What’s a major advantage of helical gears?

A

Multiple teeth engage at one time reducing noise and increasing strength

32
Q

What gear set changes rotary motion into linear motion?

A

Rack and pinion

33
Q

Hypoid angle gears and Amboid gears have high load handling capability. What’s the difference between them?

A

Hypoid angle gears have the angle pinion gear below the centerline. Amboid gears is above centreline to allow a higher driveline position.

34
Q

What application could you see a strong but expensive, worm and worm wheel gearset in

A

Hi torque load application such as winch drive

35
Q

A planetary gear set needs a drive member, a driven member and a stationary or held member. What is another name for the stationary member?

A

The reactionary member

36
Q

What are five various planetary gear set conditions?

A
Direct drive. 
Reverse
Reduction
Overdrive
Neutral