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Millwright Block 2 (harmonized) NS > Couplings, Brakes, and Clutches > Flashcards

Couplings, Brakes, and Clutches Flashcards

(77 cards)

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1
Q

What are the 3 basic types of couplings?

A

Rigid
Flexible
Special purpose

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2
Q

What type of connection do rigid couplings provide?

A

Fixed union
(Shaft extension)

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3
Q

What are the 5 types of rigid couplings?

A

Sleeve
Compression
Ribbed
Flange face
Threaded

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4
Q

What type of applications are sleeve couplings used?

A

Low speed
Low torque

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5
Q

How are sleeve couplings attached to the shafts?

A

Keyway and set screws

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6
Q

How are compression couplings attached to the shaft?

A

Using tapered sleeves and hubs

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7
Q

What applications are compression couplers used in?

A

-Light to moderate loads
-Where the coupling must be installed/removed frequently

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8
Q

What applications are ribbed couplings used?

A

Heavy load
Heavy torque

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9
Q

How are ribbed couplings attached to the shaft?

A

Compression from the bolts
Keyway

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10
Q

What type of coupler is this?

A

Ribbed coupling

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11
Q

What type of coupler is pictured?

A

Sleeve coupling

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12
Q

What type of coupler is pictured?

A

Compression coupler

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13
Q

What is a rigid multi bore coupler?

A

A ribbed coupling for two different sized shafts

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14
Q

How are flange face couplings attached to the shaft?

A

Heavy interference or taper fit

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15
Q

What applications are flange face couplings used in?

A

Light application

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16
Q

What coupler is pictured?

A

Flange face coupler

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17
Q

What are threaded couplers used for?

A

Mainly with pumps or vertical positions

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18
Q

What type of coupler is pictured?

A

Threaded

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19
Q

What is the main benefit of using a flexible coupling?

A

Compensate for some misalignment

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20
Q

What are the 3 ways flexible couplings are classified?

A

Mechanical flexibility
Material flexibility
Combination

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21
Q

What are the 4 types of mechanical flexible couplings

A

Roller chain
Silent chain
Synthetic chain
Gear

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22
Q

What are the 3 types of chain couplings?

A

Roller
Silent
Synthetic

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23
Q

What are the characteristics of chain couplings?

A

-Mechanical flexibility
-Limited torsional, shock, and vibration dampening capabilities

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24
Q

What are the 2 type of roller chain couplings?

A

Double
Single

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25
What coupler is pictured?
Single roller chain coupling
26
What applications are silent chain couplings used for?
Heavy duty
27
What speeds can silent chain get to?
Up to 5000rpm
28
What are the disadvantages to silent chain?
Very minimal amounts of misalignment Flexibility is very limited
29
What applications are synthetic chains used for?
Light power transmission drives
30
What type of coupler is pictured?
Silent chain
31
What applications are gear couplings used for?
Extremely high torque High rpm’s
32
What is the benefit of curved tooth gear couplings?
Tolerate more misalignments
33
What are the 4 most common material flexible couplings?
Rubber tire couplings Elastomeric couplings Pin and biscuit couplings Flexible metal disc couplings
34
What is the main disadvantage to material flexible couplings?
Shorter service life
35
Which type of coupling must have misalignment less than bearing tolerance?
Rigid
36
The input shaft of a fluid coupling is connected to which component?
Impeller
37
What is the purpose of a fluid coupling?
To allow the driver to come up to speed before engaging
38
Allowing the prime mover to reach a set running rpm before applying load using a clutch is known as ___________
A soft start
39
A shaft with universal joints on each end and a splined slip joint is best used when
Angular, offset and or axial misalignment is present
40
What is the main advantage of a flexible coupling over a rigid coupling?
They compensate for minor misalignment
41
What style of coupling is commonly used on vertical pumps?
Threaded coupling
42
What are the 3 styles styles of universal joints?
Double joint Single joint constant velocity
43
Where are silent chain couplings mainly used?
High speed High torque
44
What must be done in terms of maintenance with a steel grid coupling
Must be lubricated
45
What is another name for a scoop coupling?
Variable fill
46
What do we call a short length of shafting coupled on each end with no bearing support?
Floating shaft
47
What coupling increases initial torque on engagement?
Torque converter
48
What is hysteresis
Lagging magnetism as the coupling turns
49
What is a disadvantage of positive contact clutches?
Engagement must be done at low speeds
50
What is the purpose of a fluid coupling?
To allow the driver to come up to speed before engaging
51
What is a backstop device on an inclined converter?
A one way brake on the roller drive
52
Brakes or clutches would be classified as electrical operation when what principles are used?
Magnetic or magnetic particle principals
53
What would a brake use to stop a piece of rotating machinery
Friction or magnetism
54
How many directions can a spiral clutch operate?
One
55
What type of clutch has no slippage on engagement and allows bidirectional power transmission?
Multi tooth clutch
56
What type of drum clutch has contact on the inside diameter to force engagement?
Expanding
57
Cone clutches typically use a drum and pad engagement angle greater than _____ degrees
10
58
What force is used when a brake is applied to keep the machine parts at rest?
Static friction
59
What friction clutch uses a wedging action for engagement?
Cone clutches
60
What type of device is purposely used to engage and disengage two shafts without physically dismantling machinery?
Clutches
61
Jaw style clutches assure positive drive with ____________
No slippage
62
What is sprag?
A cammed roller or wedge
63
When will friction clutches do their most slipping?
On engagement
64
What do torque limiting clutches when they become overloaded ?
Slip
65
Is a threaded coupling a centrifugal coupling?
No
66
What effect reduces brake stopping efficiency?
Brake fade
67
Which friction clutch uses expanding or contracting shoes?
Radial clutch
68
When can friction clutches be engaged?
Anytime regardless of driven and driver speeds
69
What do brakes use to work effectively?
Friction
70
What is needed most of braking a heavy load for a prolonged time?
Lots of cooling capacity
71
What will increase the torque capacity the most in an axial clutch with limited diameter
Increase number of friction plates
72
What coupling used material flexibility to transmit power and deal with minor misalignment
Quill coupling
73
Where are silent chain couplings mainly used?
High speed High torque
74
What is an example of a typical back stop device on an inclined conveyor?
A one way brake on the roller device
75
When can friction clutches be engaged?
Anytime regardless of driven and driver speed
76
What is needed if braking a heavy load or for prolonged periods of time?
Lots of cooling capacity
77
What actuates a pneumatically actuated brake or clutch
Air pressure

Millwright Block 2 (harmonized) NS (17 decks)

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