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definitions - coupling

couple (n.)

1.a pair who associate with one another"the engaged couple" "an inseparable twosome"

2.a pair of people who live together"a married couple from Chicago"

3.(physics) something joined by two equal and opposite forces that act along parallel lines

4.two items of the same kind

5.a small indefinite number"he's coming for a couple of days"

couple (v. trans.)

1.bring two objects, ideas, or people together"This fact is coupled to the other one" "Matchmaker, can you match my daughter with a nice young man?" "The student was paired with a partner for collaboration on the project"

2.link together"can we couple these proposals?"

3.engage in sexual intercourse"Birds mate in the Spring"

4.form a pair or pairs"The two old friends paired off"

coupling (n.)

1.the act of bringing two things into contact (especially for communication)"the joining of hands around the table" "there was a connection via the internet"

2.the act of pairing a male and female for reproductive purposes"the casual couplings of adolescents" "the mating of some species occurs only in the spring"

3.a mechanical device that serves to connect the ends of adjacent objects

4.a connection (like a clamp or vise) between two things so they move together

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Merriam Webster

CoupleCou"ple (kŭp"'l), n. [F. couple, fr. L. copula a bond, band; co- + apere, aptum, to join. See Art, a., and cf. Copula.]
1. That which joins or links two things together; a bond or tie; a coupler. [Obs.]

It is in some sort with friends as it is with dogs in couples; they should be of the same size and humor. L'Estrange.

I'll go in couples with her. Shak.

2. Two of the same kind connected or considered together; a pair; a brace. “A couple of shepherds.” Sir P. Sidney. “A couple of drops” Addison. “A couple of miles.” Dickens. “A couple of weeks.” Carlyle.

Adding one to one we have the complex idea of a couple. Locke.

[Ziba] met him with a couple of asses saddled. 2 Sam. xvi. 1.

3. A male and female associated together; esp., a man and woman who are married or betrothed.

Such were our couple, man and wife. Lloyd.

Fair couple linked in happy, nuptial league. Milton.

4. (Arch.) See Couple-close.

5. (Elec.) One of the pairs of plates of two metals which compose a voltaic battery; -- called a voltaic couple or galvanic couple.

6. (Mech.) Two rotations, movements, etc., which are equal in amount but opposite in direction, and acting along parallel lines or around parallel axes.

☞ The effect of a couple of forces is to produce a rotation. A couple of rotations is equivalent to a motion of translation.

CoupleCou"ple, v. t. [imp. & p. p. Coupled (kŭp"'ld); p. pr. & vb. n. Coupling (kŭp"lĭng).] [F. coupler, fr. L. copulare. See Couple, n., and cf. Copulate, Cobble, v.]


1. To link or tie, as one thing to another; to connect or fasten together; to join.

Huntsman, I charge thee, tender well my hounds, . . .
And couple Clowder with the deep-mouthed brach.
Shak.

2. To join in wedlock; to marry. [Colloq.]

A parson who couples all our beggars. Swift.

CoupleCou"ple, v. i. To come together as male and female; to copulate. [Obs.] Milton. Bacon.

CouplingCoup"ling (-l?ng), n.
1. The act of bringing or coming together; connection; sexual union.

2. (Mach.) A device or contrivance which serves to couple or connect adjacent parts or objects; as, a belt coupling, which connects the ends of a belt; a car coupling, which connects the cars in a train; a shaft coupling, which connects the ends of shafts.

Box coupling, Chain coupling. See under Box, Chain. -- Coupling box, a coupling shaped like a journal box, for clamping together the ends of two shafts, so that they may revolve together. -- Coupling pin, a pin or bolt used in coupling or joining together railroad cars, etc.

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definition (more)

definition of Wikipedia

synonyms - coupling

see also - coupling

phrases

-A Couple More Years • A Couple of Days in Larsville • A Couple of Guys • A Couple of Song and Dance Men • A Mad Couple Well-Match'd • A Perfect Couple • Australia's Perfect Couple • Common couple violence • Couple (disambiguation) • Couple (mechanics) • Couple Days Off • Couple and family therapy • Couple or Trouble • Couple to Couple League • Couple's Retreat Garden • Cousin couple • Fairy Couple • Golden Raspberry Award for Worst Screen Couple • How to Clean a Couple o' Things • Just a Couple of Days • Kicking a Couple Around • Le Couple • Legendary Couple • List of The Odd Couple episodes • Marge and Homer Turn a Couple Play • Married couple • Married couple's allowance • Odd Couple • Odd Couple (film) • Penal couple • Signorile couple • Terror Couple Kill Colonel • The Aryan Couple (2004 film) • The Haw-Hawed Couple • The Imprudent Young Couple • The Last Married Couple in America • The Little Couple • The Married Couple of the Year Two • The New Odd Couple • The Odd Couple • The Odd Couple (TV series) • The Odd Couple (album) • The Odd Couple (film) • The Odd Couple II • The Oddball Couple • The Perfect Couple • The Perfect Couple (The O.C. episode) • The Perfect Couple (film) • The blind couple from Mali • There Was an Old Couple • Tusi-couple • Un couple épatant • World's Greatest Couple • Zinc-copper couple

-AC Coupling • Angular momentum coupling • Aperture-to-medium coupling loss • Azo coupling • Azo-coupling • Bibliographic coupling • Bicycle Torque Coupling • Cadiot-Chodkiewicz coupling • Cadiot–Chodkiewicz coupling • Capacitive coupling • Castro-Stephens coupling • Chemiosmotic coupling • Conductive coupling • Coupling (Greek TV series) • Coupling (TV series) • Coupling (U.S. TV series) • Coupling (UK TV series) • Coupling (computer science) • Coupling (disambiguation) • Coupling (electronics) • Coupling (physics) • Coupling (piping) • Coupling (probability) • Coupling (railway) • Coupling (railway) by country • Coupling Facility • Coupling capacitor • Coupling constant • Coupling loss • Coupling nut • Coupling parameter • Coupling reaction • Coupling rod • Coupling, Energetics and Dynamics of Atmospheric Regions • Cross coupling reaction • DC Coupling • DC coupling • Diazo-thioketone coupling • Diazonium coupling • Direct coupling • Disc coupling • Efferent coupling • Elastic coupling • Electromechanical coupling coefficient • Evanescent wave coupling • Excitation-contraction coupling • Fifth wheel coupling • Fluid coupling • Foerster coupling • Fukuyama coupling • Gauge coupling • Gear coupling • Gravitational coupling constant • Hiyama coupling • Hose coupling • Hydrodynamic coupling • IBM Cross System Coupling Facility (XCF) • Inductive coupling • Inertia coupling • International conference on Physics of Light-Matter Coupling in Nanostructures • J-coupling • Jaw coupling • Kinematic coupling • Kumada coupling • Liebeskind-Srogl coupling • List of Coupling cast members • List of Coupling episodes • Loose coupling • Low-Coupling / High-Cohesion pattern • Meatchopper coupling • Morning Musume Zen Singles Coupling Collection • Negishi coupling • Neutral Ion Coupling Explorer • Oldham coupling • Oxidative coupling • Palladium-catalyzed coupling reactions • Peptide coupling • Peptide coupling reagent • Pinacol coupling • Pinacol coupling reaction • Quantum coupling • Residual dipolar coupling • Roll-coupling • Rovibrational coupling • Rovibronic coupling • Running coupling • Russell-Saunders coupling • Sequential coupling • Shape memory coupling • Sonogashira coupling • Spacer coupling • Stille coupling • Substrate coupling • Tightlock coupling • Vibronic coupling • Viscous coupling • Viscous coupling unit • Wurtz coupling

analogical dictionary


 

(two by two)[Thème]

couple (n.)










sexuality[Domaine]

SexualReproduction[Domaine]

couple (v. tr.)



 

MESH root[Thème]

coupling [MeSH]







 

Editeurs (fr)[Domaine]

Domaines (fr)[Domaine]

coupling (n.)


Wikipedia

Couple

                   

Couple (About this sound pronunciation ) may refer to:

  See also

   
               

Coupling

                   
Rotating coupling

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings which can slip or disconnect when some torque limit is exceeded.

The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. By careful selection, installation and maintenance of couplings, substantial savings can be made in reduced maintenance costs and downtime.

Contents

  Uses

Shaft couplings are used in machinery for several purposes, the most common of which are the following.[1]

  • To provide for the connection of shafts of units that are manufactured separately such as a motor and generator and to provide for disconnection for repairs or alterations.
  • To provide for misalignment of the shafts or to introduce mechanical flexibility.
  • To reduce the transmission of shock loads from one shaft to another.
  • To introduce protection against overloads.
  • To alter the vibration characteristics of rotating units.

  Types

  Rigid

A rigid coupling is a unit of hardware used to join two shafts within a motor or mechanical system. It may be used to connect two separate systems, such as a motor and a generator, or to repair a connection within a single system. A rigid coupling may also be added between shafts to reduce shock and wear at the point where the shafts meet.

When joining shafts within a machine, mechanics can choose between flexible and rigid couplings. While flexible units offer some movement and give between the shafts, rigid couplings are the most effective choice for precise alignment and secure hold. By precisely aligning the two shafts and holding them firmly in place, rigid couplings help to maximize performance and increase the expected life of the machine. These rigid couplings are available in two basic designs to fit the needs of different applications. Sleeve-style couplings are the most affordable and easiest to use. They consist of a single tube of material with an inner diameter that's equal in size to the shafts. The sleeve slips over the shafts so they meet in the middle of the coupling. A series of set screws can be tightened so they touch the top of each shaft and hold them in place without passing all the way through the coupling.

Clamped or compression rigid couplings come in two parts and fit together around the shafts to form a sleeve. They offer more flexibility than sleeved models, and can be used on shafts that are fixed in place. They generally are large enough so that screws can pass all the way through the coupling and into the second half to ensure a secure hold.Flanged rigid couplings are designed for heavy loads or industrial equipment. They consist of short sleeves surrounded by a perpendicular flange. One coupling is placed on each shaft so the two flanges line up face to face. A series of screws or bolts can then be installed in the flanges to hold them together. Because of their size and durability, flanged units can be used to bring shafts into alignment before they are joined together. Rigid couplings are used when precise shaft alignment is required; shaft misalignment will affect the coupling's performance as well as its life. Examples:

  Flexible

Flexible couplings are used to transmit torque from one shaft to another when the two shafts are slightly misaligned. Flexible couplings can accommodate varying degrees of misalignment up to 3° and some parallel misalignment. In addition, they can also be used for vibration damping or noise reduction.

  Beam

  A beam coupling

A beam coupling, also known as helical coupling, is a flexible coupling for transmitting torque between two shafts while allowing for angular misalignment, parallel offset and even axial motion, of one shaft relative to the other. This design utilizes a single piece of material and becomes flexible by removal of material along a spiral path resulting in a curved flexible beam of helical shape. Since it is made from a single piece of material, the Beam Style coupling does not exhibit the backlash found in some multi-piece couplings. Another advantage of being an all machined coupling is the possibility to incorporate features into the final product while still keep the single piece integrity.

Changes to the lead of the helical beam provide changes to misalignment capabilities as well as other performance characteristics such as torque capacity and torsional stiffness. It is even possible to have multiple starts within the same helix.

The material used to manufacture the beam coupling also affects its performance and suitability for specific applications such as food, medical and aerospace. Materials are typically aluminum alloy and stainless steel, but they can also be made in acetal, maraging steel and titanium. The most common applications are attaching encoders to shafts and motion control for robotics.

  Constant velocity

There are various types of constant-velocity (CV) couplings: Rzeppa joint, Double cardan joint, and Thompson coupling.

  Diaphragm

Diaphragm couplings transmit torque from the outside diameter of a flexible plate to the inside diameter, across the spool or spacer piece, and then from inside to outside diameter. The deforming of a plate or series of plates from I.D. to O.D accomplishes the misalignment.

  Disc

Disc couplings transmit torque from a driving to a driven bolt tangentially on a common bolt circle. Torque is transmitted between the bolts through a series of thin, stainless steel discs assembled in a pack. Misalignment is accomplished by deforming of the material between the bolts.

  Fluid

  Gear

  A gear coupling

A gear coupling is a mechanical device for transmitting torque between two shafts that are not collinear. It consists of a flexible joint fixed to each shaft. The two joints are connected by a third shaft, called the spindle.

Each joint consists of a 1:1 gear ratio internal/external gear pair. The tooth flanks and outer diameter of the external gear are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are called gears because of the relatively large size of the teeth.

Gear couplings and universal joints are used in similar applications. Gear couplings have higher torque densities than universal joints designed to fit a given space while universal joints induce lower vibrations. The limit on torque density in universal joints is due to the limited cross sections of the cross and yoke. The gear teeth in a gear coupling have high backlash to allow for angular misalignment. The excess backlash can contribute to vibration.

Gear couplings are generally limited to angular misalignments, i.e., the angle of the spindle relative to the axes of the connected shafts, of 4-5°. Universal joints are capable of higher misalignments.

Single joint gear couplings are also used to connected two nominally coaxial shafts. In this application the device is called a gear-type flexible, or flexible coupling. The single joint allows for minor misalignments such as installation errors and changes in shaft alignment due to operating conditions. These types of gear couplings are generally limited to angular misalignments of 1/4-1/2°.

  Hirth

  Oldham

  Animated Oldham coupler

An Oldham coupling has three discs, one coupled to the input, one coupled to the output, and a middle disc that is joined to the first two by tongue and groove. The tongue and groove on one side is perpendicular to the tongue and groove on the other. The middle disc rotates around its center at the same speed as the input and output shafts. Its center traces a circular orbit, twice per rotation, around the midpoint between input and output shafts. Often springs are used to reduce backlash of the mechanism. An advantage to this type of coupling, as compared to two universal joints, is its compact size. The coupler is named for John Oldham who invented it in Ireland, in 1821, to solve a paddle placement problem in a paddle steamer design.

  Rag joint

Rag joints are commonly used on automotive steering linkages and drive trains. When used on a drive train they are sometimes known as giubos.

  Universal joint

Universal joints are also known as Cardan joints.

  Others

  • Bellows coupling — low backlash
  • Elastomeric coupling
    • Bushed pin coupling
    • Donut coupling
    • Spider or jaw coupling (or lovejoy coupling)
  • Geislinger coupling
  • Resilient coupling
  • Roller chain and sprocket coupling

  Requirements of good shaft alignment / good coupling setup

  • it should be easy to connect or disconnect the coupling.
  • it does allow some misalignment between the two adjacent shaft rotation axes.
  • it is the goal to minimise the remaining misalignment in running operation to maximise power transmission and to maximise machine runtime (coupling and bearing and sealings lifetime).
  • it should have no projecting parts.
  • it is recommended to use manufacturer's alignment target values to set up the machine train to a defined non-zero alignment, due to the fact that later when the machine is at operation temperature the alignment condition is perfect

  Coupling maintenance and failure

Coupling maintenance is generally a simple matter, requiring a regularly scheduled inspection of each coupling. It consists of:

  • Performing visual inspections, checking for signs of wear or fatigue, and cleaning couplings regularly.
  • Checking and changing lubricant regularly if the coupling is lubricated. This maintenance is required annually for most couplings and more frequently for couplings in adverse environments or in demanding operating conditions.
  • Documenting the maintenance performed on each coupling, along with the date.[2]

Even with proper maintenance, however, couplings can fail. Underlying reasons for failure, other than maintenance, include:

  • Improper installation
  • Poor coupling selection
  • Operation beyond design capabilities.[2]

The only way to improve coupling life is to understand what caused the failure and to correct it prior to installing a new coupling. Some external signs that indicate potential coupling failure include:

  • Abnormal noise, such as screeching, squealing or chattering
  • Excessive vibration or wobble
  • Failed seals indicated by lubricant leakage or contamination.[2]

  Checking the coupling balance

Couplings are normally balanced at the factory prior to being shipped, but they occasionally go out of balance in operation. Balancing can be difficult and expensive, and is normally done only when operating tolerances are such that the effort and the expense are justified. The amount of coupling unbalance that can be tolerated by any system is dictated by the characteristics of the specific connected machines and can be determined by detailed analysis or experience.[2]

  See also

  References

  1. ^ http://www.totalpumps.co.nz/products/couplings/
  2. ^ a b c d Boyle, B.(2008) "Tracking the causes of coupling failure" Plant Services[1] Explore coupling maintenance and the telltale signs of failure to maximize coupling life and ensure reliable system operations.

  External links

   
               

 

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