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Millwright Level 2 > Couplings, Clutches and Brakes > Flashcards

Couplings, Clutches and Brakes Flashcards

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1
Q

What are the 4 basic types of couplings

A

Rigid, Flexible, U-joints, Cetrifugal

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2
Q

What are the 3 types of misalignment

A

Angular, Parallel (offset), Axial

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3
Q

This coupling is a long, heavy-walled tube with a precision bore and a keyway cut along the the length

A

Sleeve coupling (low speed, low torque)

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4
Q

Types of rigid flange couplings

A

Spigot and recess (keyed), Compression (no keys)

Can be same size or different diameter shafts

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5
Q

Clamp (muff) couplings are for high or low speed drives?

A

Low speed (unbalanced weight), heavy load and torque

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6
Q

What are the 3 types of Flexible couplings

A

Mechanically, elastomeric, universal

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7
Q

Couplings of this type get their flexibility from the sliding or rolling of mating parts and usually require lubrication

A

Mechanically flexible

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8
Q

This flexible coupling is composed of two jawed hubs and a slider block between them. Designed for low speed and high torque

A

Jaw and slider (allow for angular and offset misalignment)

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9
Q

This coupling have two hubs with curved external teeth joined by an outer member with internal teeth

A

Gear-type double engagement (can operate at high speeds)

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10
Q

Gear-type couplings allow for angular misalignment of this many degrees

A

1.5 degrees

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11
Q

What types of chain are available for chain couplings

A

Roller (moderate speed), silent (heavy duty drives up to 5000rpm), and synthetic (light power)

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12
Q

In these couplings multi-grooved flanges hold a flat steel grid what weaves in and out through grooves

A

Metallic grid

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13
Q

These metallic couplings need no lubrication, are double-engagement and allow high-speed operation and are well balanced

A

Metallic disk (no backlash permitted)

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14
Q

This coupling uses elastomeric elements called spiders

A

Jaw elastomeric (lovejoy)

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15
Q

These couplings transmit torque through shear loading of the elastomer

A

Unclamped doughnut coupling

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16
Q

These couplings have an elastomeric, split doughnut with metal inserts permanently moulded into them

A

Clamped doughnut couplings

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17
Q

These couplings have a flexing element with reinforcement at the outermost radii

A

Clamped tire coupling

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18
Q

These couplings are used to connect high-inertia drives to low-inertia driven members

A

Bushed pin coupling (diesel engine to hydrostatic pump)

High rotational speeds

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19
Q

These couplings accommodate large amounts of offset alignment without creating side load on the shafts

A

Offset coupling

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20
Q

These are used to accommodate shafts which have misalignment greater than flexible couplings allow

A

U-joints

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21
Q

A single U-joint is used to connect shafts with this type of misalignment

A

Angular

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22
Q

Two U-joints are used to connect shafts with this type of misalignment

A

Angular and/or offset (U-joints cannot accommodate axial misalignment (end play)

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23
Q

The recommended maximum shaft angles for a U-joint

A

15 degrees below 100 rpm, up to 45 degrees (5 degrees minimum)

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24
Q

The two simplest types of U-joints

A

Block and pin, cross-and-bearing

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25
Q

The 3 types of centrifugal couplings

A

Mechanical (clutch-style), hydraulic (fluid coupling), dry fluid

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26
Q

Allowing the prime mover to reach a set rotational speed before applying the load of driven equipment is known as this

A

A soft start

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27
Q

This safety device trips a switch when the coupling reaches a critical temperature

A

Thermal cutout

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28
Q

In this type of coupling centrifugal force causes weights to press friction material against a drum to transmit power

A

Clutch-style

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29
Q

These couplings have a impeller and turbine (runner)

A

Fluid coupling

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30
Q

This occurs at start-up when the impeller is turning and the turbine is not moving

A

High vortex

31
Q

This occurs when the impeller and turbine run at almost equal speeds

A

Low vortex

32
Q

Torque development in this coupling depends on the amount of fluid available in the working section

A

Constant fill

33
Q

This type of fluid coupling uses a reservoir and offers excellent overload protection

A

Delayed fill

34
Q

This fluid coupling uses an external lever

A

Variable fill

35
Q

At this many rpm centrifugal lockup couplings are mechanically linked 1:1

A

850 rpm (called lockup)

36
Q

These couplings have in their housings a single rotor and a predetermined amount of heat-treated metal shot

A

Dry fluid (shot) couplings

37
Q

The shot in a dry coupling is called this

A

flow charge

38
Q

The two categories of clutches

A

Mechanical and electromagnetic

39
Q

This type of mechanical clutch has square teeth that lock into mating recesses in facing members

A

Square jaw (engage at up to 10 rpm)

40
Q

This type of mechanical clutch has sloped on one side of the jaw for easy engagement

A

Spiral jaw (engage at up to 150 rpm)

41
Q

This mechanical clutch have two mating rings with a large number of small teeth or serrations

A

Multi-tooth (engage up to 300 rpm)

42
Q

The two mating surfaces of a friction clutch or brake

A

Cast iron as a disk, band or drum. Other surface is a friction facing of moulded organic material bound by heat-cured resin (plate, pad, or shoe)

43
Q

This is a protective device that limits the torque transmitted to the equipment

A

Torque limiter

44
Q

The two types of drum units

A

Constricting and expanding

45
Q

These clutches are units which allow unidirectional power transmission

A

Over-running

46
Q

These clutches have pieces composed of two non-concentric curves of different radius

A

Sprag

47
Q

In these clutches the input and output shafts are connected by a coiled spring

A

Wrap spring (ID of spring slightly smaller than OD of shaft hubs)

48
Q

These clutches transmit torque through rollers that ride on the ramped or cammed surface

A

Roller-ramp

49
Q

The three basic types of electromagnetic clutches and brakes

A

Magnetic particle, eddy current, hysteresis

50
Q

This electromagnetic clutch/brake has dry iron particles fill the space between input and output members

A

Magnetic particle (good for continuous changes of speed)

51
Q

These clutches have an input drum, a stationary field coil, and an output rotor

A

Eddy current (not used to hold a load)

52
Q

In this clutch a coil generates a magnetic field in the input rotor and in the output element called a drag cup

A

Hysteresis (used in fractional horsepower applications)

53
Q

Methods of actuation for clutches and brakes

A

Mechanical, electrical, pneumatic, hydraulic, self-activating

54
Q

The simplest cheapest way to engage clutches and brakes

A

Mechanical

55
Q

An electromagnetic clutch or brake has two basic parts

A

annular electromagnet (coil), and an armature

56
Q

The most frequent method of actuation for clutches and brakes in industrial equipment

A

Pneumatic (up to 200 psi)

57
Q

This type of actuation actuates and releases because of differences in speed or direction of rotation

A

Self-activating

58
Q

This is a special type of coupling commonly used on applications such as vertical pumps

A

Threaded couplings

59
Q

The axial travel for a chain coupling can be up to this

A

1/4”

60
Q

A smaller more compact version of the rubber tire coupling

A

Bonded rubber type

61
Q

These joints are used when the joint angles are uneven

A

Constant velocity joints (CV joints)

62
Q

The amount of slip on a fluid coupling can be between this percentage

A

2-6%

63
Q

Fluid couplings use these in the couplings housing if an overload continues

A

Fusible plugs (sometimes uses a switch that can be triggered)

64
Q

Fluid couplings should be filled to a maximum of this percentage of their total capacity

A

80%

65
Q

This coupling is used where the drive component cannot be located close to the driving motor

A

Floating shaft coupling (spool)

66
Q

Couplings over this many rpm’s need to be dynamically balanced

A

3600 rpm

67
Q

The gap between halves on a split rigid coupling should be this much

A

1/16” to 1/8”

68
Q

Cone clutch engagement angles

A

10-15 degrees

69
Q

Silent chain couplings are for speeds up to

A

5000 rpm

70
Q

The amount of axial movement on a metallic grid coupling

A

3/16” on a 2 to 4 inch diameter coupling

71
Q

How hot should you heat the coupling for a shrink fit

A

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

72
Q

Coupling used for high torque and power applications

A 
Gear coupling
Universal joints
Silent chain
Flange-face
Flexible metal disk
73
Q

Couplings used for low HP

A 
Sleeve
Roller chain
Rubber tire
Steel grid
Jaw and spider
Splined rubber (unclamped doughnut)

Millwright Level 2 (10 decks)

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