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Second Year Millwright > Couplings clutches and brakes > Flashcards

Couplings clutches and brakes Flashcards

0
Q

What are the three basic types of couplings?

A

Rigid, flexible, and special purpose couplings

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1
Q

A coupling is a what?

A

It is a power transmission component use to connect the driving and driven shafts end to end

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2
Q

Describe a rigid coupling

A

It is a fixed union between two shafts. Rigid coupling does not allow for any deviation in alignment and has no provision for end float

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3
Q

What are the different types of rigid couplings?

A

Sleeve couplings, compression couplings, ribbed couplings, flange face couplings and threaded couplings

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4
Q

What are sleeve couplings good for?

A

They are used in low-speed and low torque applications

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5
Q

How does the compression coupling grip the shaft?

A

By using tapered sleeves in tapered hubs. It is used in equipment with light to moderate load. the shafts can be the same or different diameters

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6
Q

Describe a ribbed coupling and its use

A

They are clamped to keep all the parts in place, but the power is transmitted through the keys. They are used in heavy load and torque machines.

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7
Q

What is a rigid multibore coupling used for?

A

They are used as a rigid coupling to connect two shafts of different diameter.

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8
Q

Describe a flange face coupling

A

They have flange halves with male and female hubs which then bolt together

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9
Q

What is another name for a flange face coupling?

A

A spigot and recess coupling

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10
Q

Describe a threaded coupling.

A

They are used on things as vertical pumps, where the drive unit is is connected to the pump by a series of threaded drive shafts. Because they are threaded they can be used ONLY in the direction of the thread of the coupling.

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11
Q

What is the most common coupling group?

A

Flexible couplings

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12
Q

Why are flexible couplings more common than rigid?

A

Because they compensate for some misalignment

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13
Q

What are the three types of flexible couplings?

A

Mechanical flexible, material flexible, combination of material and mechanical flexible

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14
Q

Name the types of mechanically flexible couplings?

A

Roller chain, silent chain, synthetic chain, and gear

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15
Q

Although flexible couplings can take some misalignment why should you aim for perfect alignment

A

The rest of the components may not be able to tolerate it

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16
Q

What type of mechanical flexible coupling does not require Grease or lubricant?

A

Synthetic chain. It is used in lower power and torque applications

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17
Q

What is the advantage of a chain coupling?

A

It is very easy to disconnect it can be replaced without moving either the drive or driven shaft

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18
Q

Which chain coupling allows for the most end float?

A

Single-strand roller chain. This is due to the absence of pin link and roller link plates in the center of the chain

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19
Q

What are silent chain couplings good for?

A

They are usually recommended for heavy duty drives at speeds up to 5000 RPM

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20
Q

Describe synthetic chain couplings?

A

They operate quiet and smoothly in the light power transmission drives. They are also nonconductive

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21
Q

Describe the gear coupling

A

The two splined hubs in the splined cover or sleeve. The teeth in the hub are straight sided and the teeth on the hubs are involute. They work similar to a spline allowing for considerable axial float and some angular an offset misalignment

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22
Q

What happens with shock load into gear coupling

A

The shock load is transferred from drive to driven or vice versa

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23
Q

What lubricant is recommended for the majority of couplings?

A

Grease.

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24
Q

What are the most common types of material flexible couplings?

A

Rubber tire coupling, elastomeric coupling, pin and biscuit coupling and flexible metal disc coupling

25
Q

What is the major advantage of using a rubber tire coupling?

A

The driving element can be changed without removing the hubs from the equipment

26
Q

What are some benefits of the rubber tire coupling?

A

It has excellent torsional flexibility that allow for any type of misalignment and and float

27
Q

Describe elastomeric coupling and their benefits

A

The transfer torque through an elastomeric element. The split insert unwraps and maybe replaced without disturbing the hubs therefore alignment is not affected

28
Q

How do you compensate for both angular an offset misalignment using a flexible metal disc coupling

A

You must use two sets. With only one, it will only tolerate angular misalignment

29
Q

What is the flexible metal disc coupling good for?

A

Is coupling has very high torsional rigidity and it’s good for high speeds and high loads

30
Q

What are the common examples of a material and mechanical flexible coupling?

A

Steel grid coupling, jaw and spider coupling, splined rubber coupling, pin and disc connector coupling, pin and rubber bushing coupling

31
Q

What does the covers do in a steel grid coupling?

A

They retain the steel grid and lubrication. They do not support or transmit any of the load

32
Q

What is a jaw and spider known as?

A

Lovejoy coupling

33
Q

Benefits of a splined rubber coupling?

A

High torsional flexibility, can tolerate shock loads, reversing loads, and dampen vibration. Non lubricated, and non conductive electrically

34
Q

Where are pin and rubber bushing couplings not recommended?

A

Where there is excessive misalignment. It will cause the bushings to wear quickly

35
Q

What are the three types of universal joints?

A

Single, double, constant velocity

36
Q

What are single universal joints limited to?

A

Low forces, low operating speeds, and small angles

37
Q

Where are double universal joints used?

A

Where there is deliberate angular, or parallel offset.

38
Q

How must double universal joints be installed?

A

It is important to universal joint to be assembled in phase. If not there could be excessive vibration. The universal joint is in phase with the yolks are in the same position on each end of the shaft

39
Q

Where are CV joints used?

A

They are used where the joint angles are unequal or changing

40
Q

What are the benefits of centrifugal design couplings

A

Soft start is the most important. smooth acceleration, overload protection, and dampening shock

It is similar to a clutch

41
Q

What are some types of centrifugal design couplings?

A

Fluid coupling, dry shop fluid coupling centrifugal shoe Couplin shear pin coupling floating shaft coupling

42
Q

What is the normal amount of slip in a fluid coupling?

A

A normal amount of slip is between 2% and 6%

43
Q

What do some fluid couplings use as protection from a continued overload

A

If usable plug in the couplings housing that will melt if it gets too hot

44
Q

How much should fluid couplings be filled?

A

They should be filled to a maximum of 80% of their total capacity

45
Q

How does a centrifugal shoe coupling work?

A

Centrifugal forces cause the shoes to move outwards and contact the outer rim of the couplings

46
Q

What is a floating shaft and a spacer shaft?

A

They are basically the same thing, but a floating shaft is longer. They bridge a span between driven and driver couplings

47
Q

What is the purpose of a clutch?

A

It is used to engage, and disengage a driven machine without starting and stopping the prime mover

48
Q

What is a positive contact clutch?

A

They depend on interlocking parts for engagement and do not allow slippage

49
Q

What are three types of positive contact clutches?

A

Square jaws, spiral jaw, multiple tooth design

50
Q

Describe square jaw clutches

A

They can be engaged at very slow speeds ((10rpm max). They are bi directional

51
Q

Describe spiral jaw clutches

A

They can be engaged at higher speeds (150 rpm max) and can drive in one direction only.

52
Q

Describe a multiple tooth clutch

A

They use a large number of small teeth for engagement. They can engage at 300 rpm max

53
Q

What is a friction clutch?

A

They provide a smooth transfer of power during engagement. They can be engaged at any speed

54
Q

What are the two classes of friction clutches

A

Radial

Axial

55
Q

What are the two types of racial friction clutches?

A

Expanding shoe and contracting shoe

56
Q

What are the three types of axial friction clutches?

A

Single disc, multi disc, cone

57
Q

What does a machine lever over center mean?

A

Allows the clutch to be locked or unlocked without continuous mechanical pressure

58
Q

What is a cone clutch

A

Is a cross between a radial and axial clutch on which provides a mechanical advantage due to the wedge in the drum.: Clutch you do have a tendency to grab so they are using applications were sudden engagement is acceptable

59
Q

Name The input and output and parts of the food coupling or clutch

A

Input is the impeller and the output is the turbine

Second Year Millwright (8 decks)

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