190303A

Question 1

What divides a gear tooth lengthwise?

Answer 1

Pitch line

Question 2

What is the larger end of a gear tooth called?

Answer 2

Heel

Question 3

What is done to a root fillet to increase strength?

Answer 3

The fillet is slightly rounded

Question 4

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

Answer 4

From the engine flywheel to the drive axles

Question 5

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

Answer 5

Coast side or Concave side

Question 6

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

Answer 6

Root, Pitch and Outside circle

Question 7

Which circle is used to determine circular gear pitch?

Answer 7

Pitch Circle

Question 8

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

Answer 8

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

Question 9

What is done to the outside surface of a gear?

Answer 9

Hardened

Question 10

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

Answer 10

True

Question 11

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

Answer 11

False: backlash is needed to allow room for expansion

Question 12

What tool is usually used to measure backlash?

Answer 12

Dial indicator

Question 13

What should you be aware of when changing backlash?

Answer 13

The wear that occurs on gear teeth

Question 14

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

Answer 14

Pinion Gear

Question 15

The crown gear is also know as?

Answer 15

The ring gear

Question 16

True or False: All gear sets must be timed?

Answer 16

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

Question 17

Are wear patterns are always the same on gear sets?

Answer 17

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

Question 18

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

Answer 18

More than one full revolution.

Question 19

What is unique about a hunting gear set ration?

Answer 19

there will be multiple decimal points.

ie. 3.44444:1

Question 20

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

Answer 20

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

Question 21

What is the formula to find a gear ratio?

Answer 21

driven teeth divided by drive teeth

Question 22

What is a reduction also known as?

Answer 22

Underdrive

Question 23

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

Answer 23

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

Question 24

What decreases during a reduction?

Answer 24

Output Speed

Question 25

How can you create more torque on an output gear?

Answer 25

Reduction/Overdrive

Question 26

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

Answer 26

500RPM

Question 27

Two external gears turn which direction in relation to eachother?

Answer 27

The girls will turn in opposite directions

Question 28

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

Answer 28

The drive gear will be larger

Question 29

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

Answer 29

False. In an overdrive output speed increases while torque decreases

Question 30

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

Answer 30

By adding an idler

Question 31

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

Answer 31

No idlers only change direction

Question 32

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

Answer 32

Radial thrust, the gears are trying to push eachother apart

Question 33

Is axial or radial thrust created by helical cut gears?

Answer 33

Axial thrust is created

Question 34

What can be used to offset axial thrust loads?

Answer 34

Thrust washers or bearings | Also a second helical cut gear can be used

Question 35

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

Answer 35

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

Question 36

External gears have teeth facing the inside of the gear?

Answer 36

No, external gears have teeth facing out

Question 37

Internal gears are a weaker gear?

Answer 37

No, internal gears can be very strong

Question 38

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

Answer 38

Clockwise also.

Question 39

Herringbone gears are also known as single helical gears?

Answer 39

No. Herringbone gears are a double helical cut gear