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Automotive > Final Drive Part 1 > Flashcards

Final Drive Part 1 Flashcards

1
Q

What are the three functions of the final drive axel assembly?

A
  1. It multiplies the torque from the transmission
  2. It changes the direction of power flow by 90 degrees
  3. It allows the drive wheels to turn at different speeds while cornering
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2
Q

The final drive axel assembly changes the power flow by ____ degrees.

A

90

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3
Q

What is responsible for allowing the wheels to turn at different speeds while cornering?

A

The final drive axle assembly

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4
Q

What are the three components of the RWD live axel?

A
  1. Rear axle housing
  2. Final drive gears
  3. Differential gears
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5
Q

What is the function of the differential gears?

A

Allows the wheels to turn at different speeds

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6
Q

What is the function of the rear axle housing?

A

Houses components and supports suspension

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7
Q

What are the two functions of the final drive gears?

A

Multiplies torque and transfers power 90 degrees to the wheels

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8
Q

What safety measures should you use when operating a hydraulic press?

A

Wear full face protection and safety boots

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9
Q

When removing some gears and bearings you may need the use of ___________

A

Bearing separators and pressure screw pullers

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10
Q

Since you should never use an impact wrench to tighten or loosen a pinion nut, what should you use?

A

Drive yoke holding tool

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11
Q

What is the purpose of a pinion depth gauge?

A

To measure the position of the drive pinion compared to OEM specs

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12
Q

What do you use to measure ring gear backlash, axle flange runout, ring gear runout and more?

A

Dial indicator

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13
Q

What is gear marking compound used for?

A

To check tooth contact patterns

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14
Q

What are the three functions of gears?

A
  1. Transmit force
  2. Multiply or decrease torque
  3. Increase or decrease speed
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15
Q

Which type of gear has straight teeth, is noisy and is used for transmissions?

A

Spur gears

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16
Q

Which type of gears have angled teeth, are stronger than spur gears, operate quietly, produce side thrust and are used as final drive gears in a transaxle?

A

Helical Gears

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17
Q

Which gears transmit torque over a 90 degree angle?

A

Plain bevel gears

18
Q

What is the equation used to calculate torque?

A

Force x radius

19
Q

What is unit is torque measured in?

A

ft-lbs (pound feet) or Nm (Newton meters)

20
Q

When a small gear drives a big gear, torque is __________ by the larger gear’s radius.

A

Increased

21
Q

2x radius = 2x ________

A

torque

22
Q

The equation to find gear ratio is: Gear ratio = ___________

A

Driven gear teeth/drive gear teeth

23
Q

If the gear ratio is 10:1, is this a reduction or overdrive?

A

Reduction

24
Q

If the gear ratio is 30/60 or 0.5:1, is this overdrive or reduction?

A

Overdrive

25
Q

If the gear ratio is 3:1, what is happening to the output gear speed?

A

Decreasing

26
Q

What is happening to the output gear speed when the gear ratio is 0.25:1?

A

Increasing

27
Q

Would you want a high or low numerical gear ratio for more towing power?

A

High

28
Q

Would you want a high or low numerical gear ratio for higher road speed?

A

Low

29
Q

Which type of gearset uses whole numbers in its ratio and must use index marks when being re-assembled?

A

Non-hunting final drive gearset

30
Q

Which gearset has a gear ratio which causes a drive pinion gear tooth to contact the same ring gear teeth over 2 or 3 revolutions?

A

Partial non-hunting final drive gearset

31
Q

Which gearset has a ratio that causes a pinion gear tooth to contact all ring gear teeth before it meets the same tooth again?

A

Hunting final drive gearset

32
Q

Which gearset could have a ratio of 2.75:1 and does not need to be marked for reassembly?

A

Hunting final drive gearset

33
Q

The _______ is found on the rear axle stamp or tag or on the vehicle certification label.

A

axle code

34
Q

How would you determine the gear ratio without removing cover?

A
  1. compare the wheel rotation to driveshaft rotation
    or
  2. divide ring gear teeth by pinion teeth
35
Q

What is the overall drivetrain ratio if the transmission gear ratio is 2:1 and the final drive gear ratio is 5:1?

A

10:1

36
Q

What is the advantage of using a hypoid final drive gearset?

A
  1. Since the drive pinion gear is below the ring gear, the drive shaft and body can be lower
  2. Reduced driveline tunnel in the floor allows more passenger room
37
Q

What is the purpose of the differential gear assembly?

A

Allows the drive wheels to turn at different speeds when required

38
Q

What is a differential made up of?

A

4 differential gears (2 pinions and 2 side gears) located inside a gear case

39
Q

When would a pinion gear walk around the slower moving side gear and transfer more speed to the outside wheel?

A

While turning

40
Q

When would each wheel rotate at 100% of case speed with the differential case driving the pinion shaft end over end?

A

While driving straight

Automotive (6 decks)

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