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Gear Couplings

Gear Couplings

Gear couplings are utilized for mechanically linking two rotating shafts that must transmit torque in a rigid manner. The transmission of torque occurs through the working gear teeth, which transmit it from hub to sleeve and vice versa, and the set bolts that connect the flanges of the two hubs.

To accommodate misalignments in the shafts being connected, gear couplings are flexible. They can compensate for initial misalignment (such as support clearances, dimensional and geometrical tolerances of the equipment, and alignment imperfections) and subsequent alignment modifications due to settling and support wear, as well as temperature changes that cause expansion.

The flexibility of gear couplings is due to the ability of their working gear teeth to float and slide, which compensates for misalignments. This floating is achieved by engaging outer spherical gear teeth with inner cylindrical ones, both with the appropriate tangential clearance. The outer spherical gear teeth enable the gear hubs to float on their central axis, allowing for axial slide and continuous lubrication flow, while avoiding any harmful stress concentration on the gear teeth.

The gear teeth are centered on their external diameters with proper radial clearance so that there is no generation of vibration from rotating masses when operating at low speed and transmitting torque. When the speed and/or torque increases, the gear teeth center on their working flanks, thus distributing the load across all the teeth.

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