A Complete Guide To The Different Causes Of Misalignment
In order to meet different requirements, various types of mechanical devices are being used in applications. Gear couplings is such a mechanical device that comprises two shaft hubs with external teeth and are connected with the help of sleeve, mainly of two pieces with internal teeth.
Gear couplings can fix shafts of two different machines and can also adjust shaft alignments in small amounts. The coupling works like that of a flexible spline with hubs and sleeves rotating jointly.
Generally, commercial couplings pass on more torque because of the huge physical size as compared to other types of couplings. Due to their load transmitting capability, these are widely used in high speed applications as well as on applications that requires high torque capacity coupled with low inertia of the drive system.
Misalignment and failure
Just like other machines are mechanical devices, gear couplings too can suffer failure from various causes. There are three types of misalignment that takes place in general -combination misalignment, parallel offset misalignment and angle misalignment.
Here are some of the cause of misalignment and failure:
- Misalignment wear is one of the causes of failures of gear couplings. If the coupling works under tremendous misalignment, wearing of teeth is increased. The tooth wear happens due to both loss of lubricant and tooth sliding movement.
- Failure due to loss of lubrication is another cause. Since, we all know how important it is for mechanical devices to be lubricated, continuous operation of gear couplings without proper lubrication may lead to huge wear and tear. Hence, adequate lubrication is needed for correct working of gear couplings.
- Loss of lubrication in gear couplings takes place due to insufficient lube filling, a damaged gasket or seal or due to an omitted lube plug. If oil is the lubricant, leakage takes place via shaft keyway, provided the keyways are not properly sealed.
- Among other reasons for deficiency of lubrication, the lubricant itself is one reason along with failure of flange fastener. Flange fastener failure can be an outcome of improper fastener tightening torque, reverse loads that is above the flange joint capacity or system torsional vibration.
There are still some other reasons for failure. So, it is really important to take preventive measures to stop misalignment and develop work efficiency of gear couplings.