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Gearbox Flashcards

1
Q

What two categories of gearboxes are there?

A

Manuel and automatic

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2
Q

Which type of gearbox uses a torque converter?

A

Automatic gearbox

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3
Q

What is direct drive?

A

Where the output shaft is rotating at the same speed as the engine

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4
Q

What is another name for a countershaft?

A

Lay shaft

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5
Q

What gear would you be in if you were experiencing high torque and low speed?

A

1st gears

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6
Q

What are disadvantages of sliding mesh gearboxes?

A
  • Excessive gear noise due to spur-type gear

- Difficulty in obtaining smooth, quick and quiet change of gear

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7
Q

What gearbox was introduced to overcome the disadvantages of the sliding mesh gearbox?

A

Constant mesh gearbox

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8
Q

How are helical gears correctly aligned in a constant mesh gearbox?

A

Thrust washers

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9
Q

What replaces the dog clutch in a synchromesh gearbox?

A

The synchroniser

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10
Q

What two main features are incorporated in the baulk ring synchromesh?

A
  • Friction cone pressure, or load, is proportional to the speed of change
  • An interception device prevents positive gear engagement until the speed of the two gears is equal
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11
Q

What are the 3 grooves on the hub of a synchromesh?

A

To locate the shifting plates

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12
Q

Why are slots on a baulk ring wider than the shifting plates?

A

To allow for a small amount of radial movement

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13
Q

What is a splitter gearbox?

A

A conventional 4 or 5 speed gearbox with additional gears to split the number of speeds in the main gearbox

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14
Q

What actuates a splitter gearbox?

A

A two position compressed air cylinder

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15
Q

What two ratios are in a splitter gearbox?

A
  • Direct ratio (low)

- Indirect -ratio (high)

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16
Q

Does the range change gearbox change the input or output of the gearbox?

A

The output

17
Q

What gear system does a range change gearbox use?

A

Epicyclic gear

18
Q

How do you achieve a high and low range in a range change gearbox?

A
  • High (everything locked together, sun gear drives directly)
  • Low (annulus is clamped and planet gears crawl around the sun gear
19
Q

How is a range change gearbox actuated?

A

An air piston operated by two solenoid valves (one for low and one for high)

20
Q

What prevents changing from a high range gear to a low range gear in a range change gearbox?

A

A range change interlock determined by speed sensors

21
Q

What is a power take off used for?

A

To send power to vehicles ancillary equipment

22
Q

What safety precautions do you need to be aware of in a PTO?

A
  • Limitations on engine/vehicle speed
  • Excessive hydraulic pressures
  • High speed rotating components
  • Correct clutch operation
23
Q

What is the primary role of a transfer gearbox?

A

To divide torque to all driven axles

24
Q

What are additional roles of a transfer gearbox?

A
  • Provide means of disconnecting the front or any axle from the drive line
  • Using a suitable gear ratio to provide an increased torque to each axle
  • House a third differential and lock
25
Q

What methods of gear selection are there?

A
  • Direct

- Remote (Rod and cable)

26
Q

For reasons of safety, what must a manual gearbox include?

A
  • Selector Detent

- Interlock Mechanism

27
Q

What are two designs of an interlock mechanism?

A
  • Swinging calliper

- Ball and plunger

28
Q

What is the purpose of an interlock mechanism?

A

To prevent the engagement of two gears simultaneously

29
Q

What does a start inhibit do on an automatic transmission?

A

Prevent the car from starting when not in ‘P’ and ‘N’

30
Q

What is a ‘kick-down’ cable used for in automatic transmission?

A

To manually shift down a gear when needed

31
Q

What does ECAT allow for?

A
  • Rapid change to engine torque (improves performance)
  • Better gear changes
  • Improved emission control
32
Q

What are advantages of ECAT?

A
  • Multiple shift patterns (modes) available
  • Driving modes stored on ‘shift maps’ in the ECU (lift)
    Smoother gear shifts
  • Readily available for use in other vehicles
  • Simplified hydraulic control system
33
Q

How is semi automatic transmission defined?

A

A transmission in which some of the functions of the normal ratio changes are affected automatically

34
Q

How many clutch packs are in a CVT?

A

2 - one for drive and one for reverse

35
Q

What moves the secondary pulley back in a CVT?

A

Return spring in the pulley

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