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Therory 1 - Two-Stroke Engine Operation > Motorcycle Driveline > Flashcards

Motorcycle Driveline Flashcards

0
Q

List four purposes of gears:

A

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

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1
Q

What is a gear?

A

A rotating lever.

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2
Q

Define gear ratio:

A

ratio of Drive to Driven gears

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3
Q

Gear types:

A

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

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4
Q

Planetary gear:

A

Used in Starter motors

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5
Q

Gear ratio formula:

A

Driven / Drive = Gear Ratio

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6
Q

Direct Drive Gear Type

A

1.000:1 (changes direction/rotation)

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7
Q

Overdrive

A

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

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8
Q

Underdrive

A

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

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9
Q

Primary Drive:

A 
Crankshaft = Drive
Clutch = Driven

Clutch / Crankshaft = Ratio

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10
Q

Transmission:

A

Main-shaft = Drive

Countershaft= Driven

Countershaft / Main Shaft = Ratio

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11
Q

Final Drive

A

Transmission = Drive

Rear Wheel = Driven

Rear wheel / Transmission Output = Ratio

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12
Q

Primary Drive Gear Types:

A
  1. Chain
  2. Belt
  3. Gear
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13
Q

Belt

A

Alignment is Critical

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14
Q

Gear:

A
  1. Crankshaft and Clutch turn opposite directions

2. Helical requires thrust bearings on crankshaft

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15
Q

Purpose of Clutch:

A

Engage and Disengage power flow.

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16
Q

Manual Clutch

A

Dry: Sealed from oil

Wet: Partially submerged in oil; dampens engagement and cools

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17
Q

Basket

A

Splined to nothing, only freewheels on transmission mainshaft

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18
Q

Drive Plates

A

Turned by basket

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19
Q

Hub

A

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

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20
Q

Pressure Plate

A

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

21
Q

Springs

A

Force holding parts together

22
Q

Manual Clutch Release Mechanisms:

A

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

23
Q

Powerflow engaged (lever out)

A

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

24
Q

Powerflow disengaged (lever in)

A

Crankshaft - Basket - Drive plates

25
Q

Clutch Slippage

A

Clutch doesn’t transfer 100% of power

Weak Springs (measure free length)

26
Q

Clutch Drag

A

Clutch doesn’t fully disengage

Worn release mechanism, warped plates, notched basket or Hub

27
Q

Centrifugal Clutch

A

Engagement depends on engine rpm

28
Q

Variable Ratio Clutch

A

Also know as continously variable rate transmission (CVT)

29
Q

Sprag Clutch

A

Engages in one direction. Slips in the other

30
Q

What is an advantage of Helical Gear?

A

Wider

31
Q

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

A
  1. Single
  2. Duplex
  3. Triplex
  4. Hyvo
32
Q

Where is Sprag Clutch used?

A

In Starter systems

33
Q

What is a Sprag clutch?

A

Engages in one direction only

34
Q

What is significant about the variable ratio clutch?

A

It’s a clutch and transmission combined.

35
Q

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

A

Centrifugal clutch (also known as “semi automatic” transmission)

36
Q

What is the formula for determining the primary drive ratio?

A

Clutch / Crankshaft

37
Q

What is the formula for determining the transmission gear ratio?

A

Countershaft / Mainshaft

38
Q

Write the formula for the determining the Final Drive Ratio.

A

Rear Wheel / Transmission Output = Ratio

39
Q

What is an advantage of a Spur Gear?

A

Strong

40
Q

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

A

Bevel Gears

41
Q

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

A

Coil and Diaphram

42
Q

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

A

Pressure Plate

43
Q

What is the Hub Splined or fastened to?

A

Mainshaft

44
Q

What plate is attached to the Hub

A

Driven

45
Q

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

A

Drive

46
Q

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

A

To absorb peaks in the power flow.

47
Q

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

A

Mainshaft

48
Q

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

A

Basket.

49
Q

What are the 5 types of clutches?

A

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

50
Q

What is the purpose of the clutch?

A

Engage and Disengage powerflow

Therory 1 - Two-Stroke Engine Operation (2 decks)

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