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millwright level 2 > couplings > Flashcards

couplings Flashcards

1
Q

three basic couplings are?

A

rigid
flexible
special purpose couplings

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2
Q

types of rigid couplings?

A

sleeve couplings
compression couplings
ribbed couplings
flange faced couplings
threaded couplings

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3
Q

When Riggid couplings are not actually a line, they can cause, what?

A

vibration problems and bearing ,seal or coupling failure

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4
Q

compression couplings are often used when the coupling must be ?

A

removed or installed often

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5
Q

Shaft couplings are power transmission components used to connect what?

A

connect the driving and driven shafts end to end

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5
Q

where are sleeved couplings used ?

A

low speeds and low torque applications , key way in bore and set screws.

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6
Q

compression couplings grip the shaft by using ?

A

tapered sleeves in tapered hubs don’t not require keys or splines

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7
Q

where are ribbed couplings used?

A

used in heavy load and torque services can be made of steel or cast iron

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7
Q

ribbed coupling fit shafts of what sizes?

A

1” to 7” often used to connect line shafting

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8
Q

rigid multi bore couplings are used to connect shaft of unequal diameter true or false

A

true

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9
Q

flange face couplings are used to attach what size shaft diameter

A

same size shafts or different diameter shafts

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10
Q

flexible couplings are classified in 3 ways

A

-mechanical flexabiltiy
-material flexibitliy
-combination of material and mechanical flexibility

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11
Q

types of mechanically flexible couplings?

A

roller chain
silent chain
synthetic chain
gear

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12
Q

mechanical flexibility couplings are metal and lubrication is required to reduce?

A

wear with in the coupling

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13
Q

what are the main advantages of silent chain couplings

A

ability to perform smoothly and quietly and remain in balance at high rotationl speeds

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14
Q

Gear couplings, have mechanical flexibility, because of the clearance between what?

A

clearance between the teeth and shape of the teeth

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14
Q

Where are synthetic chain couplings used?

A

light power transmission drives
used where oil or grease are not desirable

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15
Q

What two types of roller chain are used for chain couplings

A

most common -double strand roller chain
-single strand roller chain-provides more end float

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16
Q

What couplings are usually made of steel and can transmit extremely high torque loads at high rpm?

A

gear couplings

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17
Q

What are the advantages of material flexible couplings

A

thye do not require lubriction
provide smooth uniform power,

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17
Q

Grease is recommended for the majority of gear couplings in applications, but slow speed drives may use?

A

heavy oil

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18
Q

What is a rubber tire coupling used to reduce?

A

vibration and shock
allows for any type of misalignment and end float

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19
Q

Metal disc couplings use a series of thin ___ to form a flexible steel disk

A

steel plates

20
Q

metal disc coupling
if a single set of disks are used they tolerate angular misalignment but if two sets of disks are used they compensate for both angular and ?

A

and offset

20
Q

Where are jaw and spider couplings used?

A

small to medium hp applications

21
Q

what coupling is recommended for high speed operation temperatures and high torque applications ?

A

metal disk couplings

22
Q

What coupling has high torsional flexibility, can tolerate shock loads, reversing, and dampen vibration and allows some shaft misalignment and tolerates considerable axial movements. It also offers excellent resistance to electrical conductivity and requires no lube and can be used in the food industry or in corrosive atmosphere.

A

splined rubber coupling

23
Q

Why are flexible? Coupling the most common couplings in the industrial application?

A

Because they compensate for some misalignment, which is a major advantage over a rigid coupling’s

23
Q

What are some desirable power transmission characteristics of centralfugal couplings?

A

soft start
smooth acceleration
overload protection
dampening shock loads

24
Q

what is soft start on a centrifugal coupling?

A

allows driver to approach running speed before applying load

25
Q

what is smooth acceleration on a central fugal coupling?

A

allows load to smoothly accelerate with out no shock to the driven unit

26
Q

what is overload protection on centrifugal design couplings

A

driver will not stall but there will be slippage between driver and driven units

26
Q

a fluid coupling consists of two operating members what are they

A

the impeller (pump)
turbine (runner)

27
Q

what is dampening shock load

A

Is achieved because of slight slippage or no positive mechanical connection is made with central fugal design couplings

28
Q

during start up the fluid coupling has high ?

A

vortex flow

29
Q

when the fluid coupling is running under normal conditions there is some slip , the amount of slip can be ?

A

2%-6%

30
Q

Most fluid coupling manufactures, recommend that the couplings be filled to a maximum of?

A

80% of their total capacity

31
Q

true or false the fluid coupling cannot tolerate any misalignment or end float because each part is held to close tolerances

A

true

32
Q

centrifugal shoe couplings use mechanical contact between the ?

A

friction shoes and the drum but application is by centrifugal force

33
Q

the correct shaft alignment is important an central shoe couplings because ?

A

any misalignment causes vibration uneven contact and wear on friction. surfaces and reduced power transfer

34
Q

where is a floating shaft coupling used ?

A

used where the drive component cannot be located close to the driving motor or where space is required for maintenance

35
Q

where are spacer couplings use d?

A

used where the coupling is frequently removed for certain maintenance to equipment
does not alter shaft alignment

36
Q

what is service factor rating ?

A

the life expectancy and use of a part under certain types of conditions like shock loading continuous maximum power use and other operating conditions

37
Q

true or false
for a given horse power as the speed (rpm) decreases the torque transmitted with in the unit increases ?

A

true

38
Q

In order to extend bearing life and to reduce vibration throughout, the machine is highly recommended that high speed couplings over_____ are dynamically balanced ?

A

3600 rpm

39
Q

what are some couplings used for high hp couplings

A

gear couplings
universal joint
silent chain
flange face couplings
flexible metal disc couplings

40
Q

some common used low hp couplings are ?

A

sleeve couplings
roller chain
rubber tire
steel grid
jaw and spider
splinter rubber couplings

41
Q

name three types of shaft misalignment to be aware of when installing couplings

A

offset
angular combination of offset and angular misalignment

42
Q

see pic for alignment

A
42
Q

what causes axial movement

A

thermal growth

43
Q

for steel hubs heat to what temp?

A

heat to 180F above ambient temp for every 0.001 of interference per inch of hub diameter

44
Q

oil bath heating is limited to what temp?

A

300f because of flammability
use a temp stick or thermometer

45
Q

what is the best heating method for tapper fit couplings

A

ovens or oil baths

45
Q

split couplings must have sufficient gap between top and bottom halves it is aprox?

A

1/16-1/8 inch on each side

46
Q

If no puller holes, it may be possible to drill the hub and tap it with holes how far apart should the holes be so the balance of the coupling is not changed

A

180 deg apart

47
Q
A
48
Q
A

millwright level 2 (17 decks)

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