What is it?
Coupling is really a device that connects two shafts together at their ends with the purpose of transmitting power. They normally don’t allow disconnection of shafts during operation, however there is torque limiting them which can slip or disconnect when some torque restriction is exceeded.
To join two pieces of rotating products while permitting some degree of misalignment or end movement or both is the couplings primary purpose. By careful selection, upkeep and of installation them, substantial cost savings can be made in reduced maintenance expenses and downtime.
What is gear coupling?
It is a mechanical device for transmitting torque between two shafts that are not collinear. It includes a flexible joint fixed to each shaft. The two joints are connected by a third shaft, called the spindle.
Each joint consists of a 1:1 gear ratio internal/external gear pair. The tooth flanks and outer diameter of the external gear are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are called gears because of the relatively huge size of the teet have got higher torque densities than general joints designed to fit a given space while general joints induce lower vibrations. The restriction on torque density in general joints is due to the limited cross sections of the cross and yoke. The gear teeth in a gear coupling have high backlash to allow for angular misalignment. The excess backlash can contribute to vibration. Get more information related to Universal coupling, visit – Cardan Shaft Manufacturers
Gear couplings are limited to angular misalignment generally, i actually.e., the angle of the spindle relative to the axes of the connected shafts, of 4-5°. Universal joints are capable of higher misalignment.
Single joint gear couplings may also be used for connecting two nominally coaxial shafts. In this program the device is called a gear-type or flexible coupling. The individual joint allows for minimal misalignment such as installation errors and adjustments in shaft alignment due to operating conditions. These types of gear couplings are generally limited to angular misalignment of 1/4-1/2°.
It is generally observed that despite having probably the most exacting precision in the original installation, subsequent misalignment may rarely end up being avoided over a period of time, foundations may settle, bearings eventually wear and sizes change with temp.
The misalignment takes place due to vibrations also. These Flexible Gear couplings are available in two configurations – Full Geared and Half Geared Half Rigid.
Full Geared Coupling: Here both the halves are identical and consist of two Hubs and two outer Flanges Sleeves bolted jointly. This type of Coupling is capable of accommodating both Offset along with Angular misalignment.
Half Geared Half Rigid Coupling: Here instead of two identical halves one half is geared and the other half is rigid. There is an individual Hub in this type since the other part is rigid. This type is used for taking caution of only Angular misalignment.