24 Sep, 2021

Don’t know about gear coupling? Here’s what it is.

A gear coupling is a device that is used to connect two shafts at their ends together to transmit power. Its primary purpose is to join two rotating pieces of equipment while also permitting end movement, misalignment, or both to some extent.

They are used for several purposes in machinery while primarily used to transfer power from one end to another. There are some other uses of the coupling like altering the vibration characteristics of rotating units, reducing the shocks from the transmission, and for protection.

Gear coupling- How it works

The Gear coupling is used, made, and designed to transmit torque between two shafts that are not collinear to each other. The coupling typically consists of two very flexible joints and one each of them is fixed to one another, and a spindle connects them both and in some cases, there is a third shaft that is used to connect them.

The drive motor is connected to the gearbox by the coupling in the hoist mechanism, and not only that the coupling can also connect the gearbox box to smaller wire rope drums directly with the help of a flanged half. Talking in terms of design couplings can also transmit torque by passing it through hubs that have crowned teeth which are with the straight gear teeth of the sleeves in the form of a permanent mesh.

This sort of design provides the highest torque transmission in the case of the smallest size. The couplings compensate for radial, angular, and axial misalignment, conform to the AGMA bolting pattern while also running at fast and high speeds.

Also read:

The evolution of Gear Coupling


Gear Coupling styles and options

Mechanism of the individual parts

The flexible gear coupling mainly consists of two hubs- one with two outer sleeves with internal spur teeth and another with crowned external teeth and they are made up of carbon steel and hardened to a certain degree.

The gear hub’s teeth are generated by the involute system and the amount of backlash and crowning values are set so that best results are achieved in smooth operation, torque transmission, and flexibility. Whereas the internal teeth of the sleeves are generated for making sure that there correct profile.

High tensile steel bolts join its coupling sleeves and they are fitted with the help of a gasket in between them. In case of misalignment, the coupling is allowed to withstand parallel misalignment with the help of the crowning of the teeth.

To be precise the coupling can withstand 1.5-degree angular misalignment, 10.25 mm parallel misalignment, and absorb 3mm of maximum axial misalignment. There are special ‘O’ rings at the coupling hub’s ends to prevent dust entry and leakage of lubricants and the rings can also withstand high temperatures of more than 10 degrees.

We hope this article can help you to have a complete understanding of how coupling works and its mechanism.

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