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Encyclopedia > Coupling
Rotating 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 does exist torque limiting couplings which can slip or disconnect when some torque limit is exceeded. Image File history File links No higher resolution available. ... There are very few or no other articles that link to this one. ...

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

  • 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 alternations.
  • 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 of shaft couplings

Rigid couplings 
are used when precise shaft alignment is required; shaft misalignment will affect the coupling's performance as well as its life.
Flexible couplings 
are designed to transmit torque while permitting some radial and axial and angular misalignment. Flexible couplings can accommodate angular misalignment up to a few degrees and some parallel misalignment.
Tourque limiting couplings 
torque limiters protect systems against overtorque conditions.

Torque applied via an adjustable end wrench Relationship between force, torque, and momentum vectors in a rotating system In physics, torque (or often called a moment) can informally be thought of as rotational force or angular force which causes a change in rotational motion. ... This article describes the unit of angle. ... There are very few or no other articles that link to this one. ...

Rigid coupling

  • Sleeve or muff coupling
  • Clamp or split-muff or compression coupling
  • Flange coupling

Flexible coupling

  • Bushed pin type coupling
  • Universal coupling
  • Oldham coupling
  • Bellows coupling - low backlash.
  • Spider or jaw coupling - elastomeric inserts for flexibility, vibration reduction.

A universal joint A universal joint, U joint, Cardan joint or Hardy-Spicer joint is a joint in a rigid rod that allows the rod to bend in any direction. ... Animated Oldham coupler An Oldham coupler is a method to transfer torque between two parallel but not collinear shafts. ...

Requirements of good shaft alignment / good coupling setup

  • it should be easy to connect or disconnect the coupling.
  • it should transmit the full power from one shaft to other without losses.
  • it does allow some misalignment between the two adjacent shaft roation axis.
  • 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 recommeded 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

Tools to measure shaft axis alignment condition

  • it is possible to measure the alignment with dial gages or feeler gages using various mechanical setups.
  • it is recommended to take care of bracket sag, parallaxe error while reading the values.
  • it is very convenient to use laser shaft alignment technique to perform the alignment task within highest accuracy.
  • is it required to align the machine better, the laser shaft alignment tool can help to show the required moves at the feet positions.

See also

For other uses, see Clutch (disambiguation). ... To control the co-linearity and angle of two shafts at the coupling, where the power is transmitted - laser shaft alignment technology can help to perform the measurement easily. ... A compression fitting 15 mm isolating valve // Compression fittings are used in plumbing to join two tubes or thin-walled pipes together. ... Fittings are used in pipe and plumbing systems to connect straight pipe or tubing sections, to adapt to different sizes or shapes, and to regulate fluid flow, for example. ...

External links

  Results from FactBites:
Coupling - Wikipedia, the free encyclopedia (371 words)
In telecommunication and electronics, coupling is the desirable or undesirable transfer of energy from one medium, such as a metallic wire or an optical fiber, to another medium, including fortuitous transfer.
The term "coupling" is often used for Angular momentum coupling, the interaction between two nuclei in Nuclear magnetic resonance.
Coupling with reference to living beings refers to mating or to the act of sexual intercourse.
  More results at FactBites »



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