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Transmissions > Clutch > Flashcards

Clutch Flashcards

1
Q

What is the purpose of the clutch?

A

Assists in transmitting drive of the engine to the road wheels smoothly

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2
Q

What are the benefits of a clutch?

A

Disconnects power produced by the engine

Progressively connects power , reducing wear

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3
Q

What are the 3 basic types of clutches

A

Dog clutch

Friction cone clutch

Basic friction plate clutch

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4
Q

What is the function of the flywheel?

A

Absorbs kinetic energy during idle strokes

Reduces vibration

Transits start motor

Mounting surface for the clutch

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5
Q

What is the purpose of the spigot bearing?

A

Supports the end of the gearbox input shaft

Allows a differential of speed between crankshaft and gearbox input

Allowing the input to slow down when clutch is operated even though engine is running

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6
Q

What are the 2 types of spigot bearings?

A

Ball type bearing

Phosphor bronze type

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7
Q

What are the characteristics of the ball type bearing?

A 
Heavy duty 
Interference fit 
Ball type bearing 
Floating 
Sealed for life
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8
Q

What are the characteristics of the phosphor bronze type?

A

Light-medium duty
Interference fit
Solid bush
Self lubricating

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9
Q

What does the friction plate do?

A

Transmit drive from flywheel to gearbox

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10
Q

How is buckling overcome on the driven plates?

A

Outer hub is slotted to allow flexing action

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11
Q

What is the wavey profile called on the friction plate?

A

Borglite crimping

This minimises clutch drag and helps spring apart the clutch

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12
Q

What does the crimping effect do?

A

Allows smoother engagement of drive of drive

Increases airflow so enhances cooling ability

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13
Q

What does the inner hub do?

A

Sandwiched between plates in the outer hub

Transmit drive to gear box input

Splines allow movement of the centre of f the plate along the input shaft

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14
Q

What is the purpose of the damper springs?

A

Transmit drive

Absorb shocks during drive engagement, from engine vibrations and overrun

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15
Q

What are the 2 purposes of the pressure plate?

A

Provide a flat driving face that mates with friction plate

Provide clamping force on to the friction plate to transmit drive

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16
Q

What are the 2 types of pressure plates?

A

Diaphragm spring

Multi-coil spring

17
Q

How is buckling of the friction plate prevented?

A

Machined slots between the outer segments and inner hub to allow flexibility

18
Q

What are advantages of the diaphragm spring?

A 
Compact and lightweight 
Less moving parts 
Not affected by centrifugal force
Lower pedal force required 
Clamping force does not reduce friction linings
19
Q

What is the purpose of the drive straps?

A

Transmits drive from the cover to the pressure plate

Transmissions (6 decks)

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