Topics: Universal joint Pages: 2 (462 words) Published: April 24, 2015
A coupling is a mechanical device used to connect two rotating shafts for the purpose of transmitting torque from the driver to the driven piece of rotating equipment. There are two basic classes of industrial couplings: rigid and flexible. Rigid couplings are not designed to allow for any misalignment. Flexible couplings can compensate for some misalignment. Flexible couplings also allow for shaft end-float, or end-play, which is the inclination of shafts to move back and forth across their bearings. All couplings should be selected according to the type of application in which they are to be used. Couplings must also be properly aligned to ensure long life and efficient transmission of power. Without proper selection and alignment, couplings, bearings, and shafts may be damaged or worn out prematurely. Equipment failures may occur resulting in possible damage to machinery, lost production, and expensive downtime. Rigid couplings

As the name implies, these are used to connect shafts rigidly. They are not designed to compensate for any misalignment or end-float. They join shafts together in the same fixed manner as if they were welded, effectively making the two shafts into one. Flanged couplings

This is also a split-type coupling, but unlike the rigged coupling, the flanged coupling is split vertically. The two flanges are mounted on the shafts and then bolted together. The two halves can be bored to different diameters, or the flanged coupling can be purchased in a tapered bushing construction, allowing much more diversity. Rigid flanged couplings are available for shaft sizes up to six inches, and even larger sizes ca be specially ordered. They tolerate no misalignment and have no shock-absorbing capabilities. Advantages

1. Easy to install
2. Require no maintenance
3. No lubrication
4. No wear if properly installed and aligned
5. They are designed for heavy-duty applications, and can handle high torque and speeds. Universal coupling
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