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School > Clutches And Brakes > Flashcards

Clutches And Brakes Flashcards

1
Q

What is the purpose of a clutch in power transmition systems?

A

To engage or disengage a driven machine, without starting and stopping the prime mover.

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2
Q

What do Positive Contact Clutches not allow?

A

Slippage

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3
Q

What are three types of Positive Contact Clutches?

A
  • Square Jaw
  • Spiral Jaw
  • Multiple-tooth design
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4
Q

Do Positive Contact Clutches have overload protection?

A

No, there is no slip allowed.

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5
Q

Can Positive Contact Clutches engage at high speeds?

A

No, because would cause massive shock and possibly break parts.

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6
Q

What is this?

A

Square Jaw Clutch

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7
Q

What is this?

A

Spial Jaw Clutch

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8
Q

Which can be engaged bidirectionally, Spiral Jaws or Square Jaws?

A

Square Jaw

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9
Q

What does Spline mean for Clutches?

A

It is a shaft in which grooves have been cut to allow a clutch gear or jaw slide back and forth to engage axially while supporting for torque.

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10
Q

What is this?

A

Multiple-Tooth Clutch

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11
Q

Name from slowest to fastest engagement the Positive Contact Clutches.

A
  • Sqaure Jaw, Spiral, Mutiple-Tooth
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12
Q

Are Friction Clutches smooth in engagement?

What speeds can they connect and disconnect?

A
  • Yes
  • Any
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13
Q

Do Friction type clutches slip?

A

Yes

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14
Q

What dampens torsional vibrations and shock in friction clutches?

A

Springs in the friction plate.

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15
Q

What is considered to be wet run friction plates?

A

Friction plates flooded with oil.

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16
Q

What danagerous material might be in friction wear plates?

A

Asbestos

17
Q
  • Are there such things as Radial Clutches?
  • What are they?
A
  • Yes
  • Expanding Shoe, Contracting Shoe
18
Q
  • How do Radial Clutches work in principal?

How do Axial Clutches work in principal.

A
  • Contact pressure is applied against a rim or drum.
  • Contact pressure applied to the face using a friction disc and pressure plate.
19
Q

What is this?

Label it.

A

An Expanding Shoe Radial Clutch

20
Q

Explain how an Expanding Shoe Clutch works.

A

A lever is attached to a sliding engagment bearing. When slid forward the shoes expand outward until they grip the drum and rotate it. The shoes are keyed to the shaft through a serise of links.

21
Q

How do Contracting Shoe Clutches work?

A

There is a drum on one shaft and a rim on the other. The rim with the bladder has shoes attached, which forces the shoes outward when the blade inflates. The shoes engage the outside of the drum.

22
Q

What is this?

Label it.

A

Contracting Shoe Clutch

23
Q

What helps remove air/hydraulic fluid from a Contracting Shoe Clutch?

A

Centrifugal Force

24
Q

What is the difference between a Clutch plate and a pressure plate in friction clutches?

A

Pressure plates sandwich a Clutch Plate and are not the wear parts. Clutch Plates are soft and must be replaced when worn down.

25
Q

What are three types of Axial Friction Clutches?

A
  • Single Friction Clutch
  • Multiple-disc Friction Clutch
  • Cone Clutches
26
Q

What is this?

Label it.

A

Single Friction Clutch

27
Q

How does a Single Friction Clutch work?

A

A friction disc is fit between the flywheel and pressure plate with spring mounted behind the friction disc to the pressure plate. The release mechanism slides forward and releases the friction disc through a bunch of levers. The disc is also splined to the shaft.

28
Q

What is the difference between Multiple-disc Friction Clutches and Single Friction Clutches?

A

Multi has more discs which means more power can be transmitted.

29
Q

What is the chief purpose of a friction clutch?

A

To provide a shock-free method of engaging a drive while running.

30
Q

Clutches are used on equipment to provide what?

A

Disengagment and Slippage

31
Q

Friction Blocks of a centrifugal clutch contact the outer surface at all times except for when?

A

At low speeds

32
Q

Bellcranks are used to what?

A

Tranfer direction of movement.

33
Q

What is a bellcrank?

A

A lever with two arms that have a common fulcrum at their juction. Used to change linear motion at an angle.

34
Q

Centrifugal Clutches become positively engaged when?

A

At high speeds.

35
Q

The purpose a Fluid Clutch is to preform what?

A

Provide smooth starts, absorb shock loads, start under heavy load.

36
Q

Dry charged fluid clutches usually have an actuating media that consists of what?

A

Steel Shot

37
Q

Answer.

A

B)

38
Q

Answer

A

D)

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