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Automatic transmissions > Clutch Assembly & Components > Flashcards

Clutch Assembly & Components Flashcards

1
Q

What does the clutch assembly include?
(List all 7)

A
  • Clutch Disc
  • Friction Material
  • Cushion Hub
  • Hub
  • Pressure Plate
  • Flywheel
  • Clutch release components
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2
Q

Pressure plate

A

Squeezes the clutch disc to the flywheel to engage the clutch.
Typically is constructed of cast iron.

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3
Q

Coil spring

A

Has coil springs located within the pressure plate.
Forces The pressure plate to clamp the clutch disc against the flywheel.

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4
Q

Diaphragm plate

A

Uses a cone shaped diaphragm spring.
Moves the pressure plate back and forth, like a lever.

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5
Q

Retaining plate

A

Riveted to the hub on the clutch disc.
Holds the torsion springs in place.

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6
Q

Flywheels

A

Two types: Standard and dual mass

The pressure plate from the clutch assembly bolts to the perimeter of the flywheel. The pressure plate bolt holes on the flywheel are threaded to allow the bolts to tighten down while securing the pressure plate to the flywheel.

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7
Q

Standard flywheels

A

Made of cast iron, transfers heat well, and durable.
Smooths out the engine firing impulses.
Reduces the vibrations.
Continues the driveshaft momentum.

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8
Q

Duel mass flywheels

A

Consists of two plates rotating together.
Has two plate cushions that reduce vibrations.

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9
Q

Flywheels - Primary

A

Faces the engine, bolts the end of the crankshaft to soothed crankshaft and reduces vibration to the flywheel.

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10
Q

Flywheels - Secondary

A

Faces the transmission, bolts to the pressure plate. Power goes through the first plate and springs dampener into other second and fewer vibrations transferred to the transmission.

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11
Q

Holes in the flywheel line up with what?

A

Holes in the flywheel line up with the holes in the crankshaft where bolts fasten to one another and move in sync as a unit.

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12
Q

Ring gear

A

Press fit to the flywheel.
Transfers power from the starter motor to start the vehicle.

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13
Q

Clutch master cylinder

A

Operated like a brake master cylinder.
Uses Hydraulic fluid to transfer motion.
Is operated by a push rod attached to the clutch pedal.

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14
Q

Clutch release fork & pivot

A

The clutch pedal moves onto the pivot to activate the clutch.
The clutch releases fork pushes on the clutch release bearings.

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15
Q

Clutch release bearings

A

Is a sealed ball bearing that is attached to the clutch release fork.
Slides over a sleeve or hub that sticks out from the front of the transmission.

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16
Q

Slave cylinder assembly

A

Pushes on the clutch release fork using hydraulic pressure.
Clutch releases the rod that transfers the piston movement to the clutch release fork.

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17
Q

Clutch release bearings assembly

A

Includes the slave cylinder and the clutch release bearing. Acts directly on the clutch release bearings.

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18
Q

Pilot bushing

A

Made of bronze to protect the end of the input shaft.
Bronze material is impregnated with oil that helps lubricate the metal surface.

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19
Q

Sealed ball bearing

A

Is lubricated and sealed.
Located between the crankshaft and the input shaft.

20
Q

Flat roller bearing

A

Has a metal outer face with needle bearings inside.
Seals against the input shaft to keep grease in, and water and dirt out.

21
Q

Diaphragm spring - Clutch cover

A

Called a pressure plate cover.
Covers the springs, levers, and pressure plate.
Holds all the components together.

22
Q

Pressure plate

A

Contains a smooth cast iron surface to dissipate heat.
Moves back and forth against the clutch disc.

23
Q

Friction surface

A

Made of cast iron.
Warpage occurs when it produces less engine power due to the lack of surface contact with the flywheel.
Cools the clutch disc.

24
Q

Hub

A

Centers the flywheel on the crankshaft and secures it firmly to the crankshaft hub.

25
Q

The hub flange

A

Holds the torsional coil springs in place.
Is secured to the input shaft.

26
Q

Torsional coil springs

A

Allow the disc hub to rotate slightly from the hub.
Absorbs torque.

27
Q

Stop pin

A

Holds the torsional movement to less than 3/8 of an inch.
Lengthens the life of the clutch.

28
Q

Cushion springs

A

Are secured to the hub by rivets.
Gradually flattens out as the clutch engages.
Raises the contact pressure on the friction material.
Cushion Springs and friction facings attach to the steel disc.
Clutch disc materials are bonded to Marcel Springs.

29
Q

What are the two types of clutch discs?

A

Rigid & Flexible

30
Q

Rigid clutch disc

A

Lacks springs in the hub.
Used with a dual massed flywheel.

31
Q

Flexible clutch disc

A

Has Springs in the hub.
Used with a standard flywheel.

32
Q

What are the two types of friction materials?

A

Woven & Molded

33
Q

Woven friction materials

A

Woven materials cushion the engagement of the clutch.

34
Q

Molded friction materials

A

Molded materials withstand higher pressure plate clamping forces without damage.

35
Q

Grooves

A

Provide better cooling.
Provide an avenue for the particles to escape.

36
Q

What does makeup include?

A

Brass, rope, ceramic, and paper materials.

37
Q

Damped clutch hub

A

Clutch hub with springs to absorb torsional vibrations.

38
Q

Mechanical linkage automatic adjuster

A

Mechanism that automatically tightens the cable linkage with the clutch assembly to remove free play.

39
Q

Mechanical linkage manual adjuster

A

Mechanism used to manually tighten the mechanical linkage in the clutch assembly to remove free play.

40
Q

Semi-centrifugal spring type

A

Pressure plate assembly that uses a weighted release lever to adjust pressure against the clutch disc, depending on engine speed.

41
Q

Clutch system operation

A
  • The driver pushes on the clutch pedal to disengage the clutch.
  • This pedal application transmits force to the clutch fork or concentric slave cylinder and then the throw out bearing.
  • This force is transmitted to the fingers on the pressure plate.
  • The fingers on the pressure plate then transmits that force to levers that lift the pressure plate away from the clutch disc.
  • The instant the pressure plate moves away from the clutch disc, the clutch disengages.
  • Power transfers takes place between the engine and transmission through the clutch disc.
  • The flywheels size, clutch disc size, and the pressure plate all contribute to the power transfer of the particular vehicle.
  • Dual plate clutches are becoming popular because they use smaller diameter components that add up to less weight to transfer the same amount of power from the engine.
42
Q

Clutch disc

A

Also called a friction disc.
Has internal splines that mate with the transmission input shaft.
Is a round metal plate covered with a friction material.

43
Q

Pressure plate

A

Also called a clutch cover, is a plate made of cast iron.
Has two common types: coil spring and diaphragm spring.
Squeezes the clutch disc to the flywheel.
Releases the clutch disc to allow gear changes.

44
Q

Release bearing

A

Also called the throw-out bearing, is mounted on a hub.
Reduces the friction between the pressure plate and the clutch fork.

45
Q

Clutch release mechanism

A

The clutch pedal assembly.
Clutch linkage, which can be mechanical, hydraulic, or cable.
Clutch fork.

46
Q

Clutch disengagement

A

When the driver presses the clutch pedal, the clutch release mechanism pushes on the clutch fork. The fork moves the release bearing into the release fingers of the pressure plate. This causes the pressure plate face to pull away from the clutch disc, releasing the clutch disc from the flywheel. The engine crankshaft turns without turning the clutch disc and the transmission input shaft.

47
Q

Clutch engagement

A

When the driver releases the clutch pedal, the spring tension in the pressure plate causes the pressure plate face to push against the clutch disc. This locks the flywheel, clutch disc, pressure plate, and transmission input shaft together. The engine rotates the transmission input shaft, gears, and drivetrain with the wheels.

Automatic transmissions (3 decks)

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