190303a

Question 1

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

Answer 1

True

Question 2

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

Answer 2

Face
Flank
Toe
Heel

Question 3

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

Answer 3

Face and flank

Question 4

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:

Answer 4

Clearance for lubricant

Question 5

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

Answer 5

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

Question 6

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

Answer 6

Reduction. Speed reduction torque increase

Overdrive speed increase torque reduction

Question 7

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

Answer 7

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

Question 8

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

Answer 8

c) 10.00:1

Question 9

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

Answer 9

False

It will only change the direction of rotation

Question 10

Explain the purpose of an idler gear

Answer 10

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

Question 11

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

Answer 11

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

Question 12

Identify one common gearset where internal gears may be used

Answer 12

Planetary gear sets

Question 13

What is another name for a double helical gear?

Answer 13

Herringbone gears

Question 14

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

Answer 14

False

Question 15

Identify the 3 main components of a simple planetary gear set

Answer 15

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

Question 16

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

Answer 16

Heel and toe separated by a center section

Question 17

What does the term path of power mean

Answer 17

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

Question 18

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

Answer 18

The drive side is convex

Question 19

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

Answer 19

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

Question 20

What are three gear circles

Answer 20

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

Question 21

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

Answer 21

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

Question 22

Why do engineers create a space called backlash?

Answer 22

To allow for expansion during operation and allow for lubrication

Question 23

If backlash is incorrect what may need to be adjusted

Answer 23

Gear mesh

Question 24

Will a worn gear increase or decrease backlash?

Answer 24

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

Question 25

What are two gears used in angled drive gear sets

Answer 25

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

Question 26

Do hunting gear sets have to be timed?

Answer 26

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

Question 27

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

Answer 27

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

Question 28

What's the purpose of adjusting gear mesh?

Answer 28

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

Question 29

What are the advantages of straight cut spur gears

Answer 29

Cheap manufacturing process, no axial thrust.

Question 30

What are disadvantages of straight cut spur gears

Answer 30

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

Question 31

What's a major advantage of helical gears?

Answer 31

Multiple teeth engage at one time reducing noise and increasing strength

Question 32

What gear set changes rotary motion into linear motion?

Answer 32

Rack and pinion

Question 33

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

Answer 33

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

Question 34

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

Answer 34

Hi torque load application such as winch drive

Question 35

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?

Answer 35

The reactionary member

Question 36

What are five various planetary gear set conditions?

Answer 36

``` Direct drive. Reverse Reduction Overdrive Neutral ```