Motorcycle Driveline

Question 0

List four purposes of gears:

Answer 0

A. Transmit power
B. Torque Multiplication
C. Change Direction
D. Timing

Question 1

What is a gear?

Answer 1

A rotating lever.

Question 2

Define gear ratio:

Answer 2

ratio of Drive to Driven gears

Question 3

Gear types:

Answer 3

1.Spur, 2.Offset-Spur, 3.Helical, 4.Planetary, 5.Worm, 6. Bevel, and 7.Sector.

Question 4

Planetary gear:

Answer 4

Used in Starter motors

Question 5

Gear ratio formula:

Answer 5

Driven / Drive = Gear Ratio

Question 6

Direct Drive Gear Type

Answer 6

1.000:1 (changes direction/rotation)

Question 7

Overdrive

Answer 7

Numerically Less than 1.000:1 (10/20=0.500:1)

Question 8

Underdrive

Answer 8

Numerically more than 1.000:1 (20/10=2.000:1)

Question 9

Primary Drive:

Answer 9

Crankshaft = Drive
Clutch = Driven

Clutch / Crankshaft = Ratio

Question 10

Transmission:

Answer 10

Main-shaft = Drive

Countershaft= Driven

Countershaft / Main Shaft = Ratio

Question 11

Final Drive

Answer 11

Transmission = Drive

Rear Wheel = Driven

Rear wheel / Transmission Output = Ratio

Question 12

Primary Drive Gear Types:

Answer 12

1. Chain
2. Belt
3. Gear

Question 13

Belt

Answer 13

Alignment is Critical

Question 14

Gear:

Answer 14

1. Crankshaft and Clutch turn opposite directions

2. Helical requires thrust bearings on crankshaft

Question 15

Purpose of Clutch:

Answer 15

Engage and Disengage power flow.

Question 16

Manual Clutch

Answer 16

Dry: Sealed from oil

Wet: Partially submerged in oil; dampens engagement and cools

Question 17

Basket

Answer 17

Splined to nothing, only freewheels on transmission mainshaft

Question 18

Drive Plates

Answer 18

Turned by basket

Question 19

Hub

Answer 19

Turns whenever clutch is engaged. Does not turn when disengaged.

Question 20

Pressure Plate

Answer 20

Transmits spring pressure to drive and driven plates to press them together.

Question 21

Springs

Answer 21

Force holding parts together

Question 22

Manual Clutch Release Mechanisms:

Answer 22

1.Rocker Arm, 2.Ball and Ramp, 3.Rack and Pinon, 4.Lever, 5.Cam, 6. Screw, 7. Hydraulic

Question 23

Powerflow engaged (lever out)

Answer 23

Crankshaft - Basket - Drive Plates - Driven Plates - Hub - Mainshaft

Question 24

Powerflow disengaged (lever in)

Answer 24

Crankshaft - Basket - Drive plates

Question 25

Clutch Slippage

Answer 25

Clutch doesn't transfer 100% of power Weak Springs (measure free length)

Question 26

Clutch Drag

Answer 26

Clutch doesn't fully disengage Worn release mechanism, warped plates, notched basket or Hub

Question 27

Centrifugal Clutch

Answer 27

Engagement depends on engine rpm

Question 28

Variable Ratio Clutch

Answer 28

Also know as continously variable rate transmission (CVT)

Question 29

Sprag Clutch

Answer 29

Engages in one direction. Slips in the other

Question 30

What is an advantage of Helical Gear?

Answer 30

Wider

Question 31

Name four types of chains that are found in Primary Drives.

Answer 31

1. Single 2. Duplex 3. Triplex 4. Hyvo

Question 32

Where is Sprag Clutch used?

Answer 32

In Starter systems

Question 33

What is a Sprag clutch?

Answer 33

Engages in one direction only

Question 34

What is significant about the variable ratio clutch?

Answer 34

It's a clutch and transmission combined.

Question 35

What type of clutch relies on engine rpm to engage and disengage power flow?

Answer 35

Centrifugal clutch (also known as "semi automatic" transmission)

Question 36

What is the formula for determining the primary drive ratio?

Answer 36

Clutch / Crankshaft

Question 37

What is the formula for determining the transmission gear ratio?

Answer 37

Countershaft / Mainshaft

Question 38

Write the formula for the determining the Final Drive Ratio.

Answer 38

Rear Wheel / Transmission Output = Ratio

Question 39

What is an advantage of a Spur Gear?

Answer 39

Strong

Question 40

What type of gear is used when shafts are 90 degrees to each other?

Answer 40

Bevel Gears

Question 41

What two types of springs are most commonly used to squeeze the clutch plates together?

Answer 41

Coil and Diaphram

Question 42

What transmits pressure to the disc stack when the clutch is engaged?

Answer 42

Pressure Plate

Question 43

What is the Hub Splined or fastened to?

Answer 43

Mainshaft

Question 44

What plate is attached to the Hub

Answer 44

Driven

Question 45

What plate is attached to and driven by the clutch basket?

Answer 45

Drive

Question 46

What is the purpose of shock dampers often found on the backs of some clutch baskets?

Answer 46

To absorb peaks in the power flow.

Question 47

What shaft does the clutch basket rotate (freewheel) on?

Answer 47

Mainshaft

Question 48

What part of the multi-plate clutch is driven by the engine crankshaft?

Answer 48

Basket.

Question 49

What are the 5 types of clutches?

Answer 49

1.Manual, 2.Centrifugal, 3.Variable ratio, 4.Sprag, 5.Torque Converter

Question 50

What is the purpose of the clutch?

Answer 50

Engage and Disengage powerflow