About Shaft Couplings

A shaft coupling is a mechanical component that connects the drive shaft and driven shaft of a motor, etc., as a way to transmit power. Shaft couplings introduce mechanical flexibility, offering tolerance for shaft misalignment. Consequently, this coupling flexibility can reduce uneven wear on the bearing, tools vibration, and other mechanical troubles because of misalignment.

Shaft couplings are available in a small type mainly for FA (factory automation) and a large casting type used for significant power transmission such as in wind and hydraulic ability machinery.
In NBK, the former is called a coupling and the latter is called a shaft coupling. Below, we will discuss the shaft coupling.
Why Do WE ARE IN NEED OF Shaft Couplings?
Even if the engine and workpiece are straight connected and appropriately fixed, slight misalignment can occur over time due to adjustments in temperature and changes over a long period of time, causing vibration and damage.
Shaft couplings serve while an important connect to minimize impression and vibration, allowing soft rotation to be transmitted.
Flexible Flanged Shaft Couplings
Characteristics
These are the most popular flexible shaft couplings in Japan that comply with JIS B 1452-1991 “Flexible flanged shaft couplings”.
A simple structure manufactured from a flange and coupling bolts. Easy to install.
The bushing between your flange and coupling bolts alleviates the consequences of torque fluctuation and impacts during startup and shutdown.
The bushing can be replaced by just removing the coupling bolt, enabling easy maintenance.
Permits lateral/angular misalignment, and reduces noises. Prevents the thrust load from being transmitted.
2 types are available, a cast iron FCL type and a carbon metal?FCLS type Flexible Shaft Couplings

Shaft Coupling Considerations
In selecting couplings a designer primary must consider motion control varieties or power transmission types. Most action control applications transmit comparatively low torques. Power transmission couplings, in contrast, are created to carry average to high torques. This decision will narrow coupling choice somewhat. Torque transmitting along with optimum permissible parallel and angular misalignment values will be the dominant considerations. Most couplings will publish these ideals and using them to refine the search should generate picking a coupling style less difficult. Maximum RPM is another significant attribute. Maximum axial misalignment may be a consideration aswell. Zero backlash is an essential consideration where feedback is used as in a action control system.
Some power transmitting couplings are designed to operate without lubricant, which may be an advantage where maintenance is a concern or difficult to execute. Lubricated couplings frequently require includes to keep the grease in. Many couplings, including chain, gear, Oldham, etc., can be found either when lubricated metal-on-metal varieties and as metal and plastic-type hybrids where usually the coupling element is made from nylon or another plastic-type to remove the lubrication requirements. You will find a reduction in torque capacity in these unlubricated forms when compared to more conventional designs.
Important Attributes
Coupling Style
Almost all of the common variations have been described above.
Maximum RPM
Many couplings have a limit on their maximum rotational swiftness. Couplings for high-velocity turbines, compressors, boiler feed pumps, etc. usually require balanced patterns and/or balanced bolts/nuts allowing disassembly and reassembly without raising vibration during operation. High-speed couplings can also exhibit windage effects in their guards, which can result in cooling concerns.
Max Transmitted Horsepower or Torque
Couplings tend to be rated by their maximum torque ability, a measurable quantity. Power is normally a function of torque occasions rpm, therefore when these values are stated it is usually at a specific rpm (5HP @ 100 rpm, for instance). Torque values will be the more commonly cited of the two.
Max Angular Misalignment
One of the shaft misalignment types, angular misalignment ability is usually mentioned in degrees and represents the maximum angular offset the coupled shafts exhibit.
Max Parallel Misalignment
Parallel misalignment capacity is generally given in linear products of inches or millimeters and represents the maximum parallel offset the coupled shafts exhibit.
Max Axial Motion
Occasionally called axial misalignment, this attribute specifies the maximum permissible growth between your coupled shafts, provided generally in inches or perhaps millimeters, and can be caused by thermal effects.