Single joint gear couplings are also utilised to hook up two nominally coaxial shafts. In this application the device is known as a gear-type flexible, or flexible coupling. The one joint allows for slight misalignments these kinds of as set up errors and changes in shaft alignment because of to operating situations. These sorts of equipment couplings are usually limited to angular misalignments of 1/4–1/2°.

Equipment couplings are normally limited to angular misalignments, i.e., the angle of the spindle relative to the axes of the linked shafts, of 4–5°. Universal joints are able of higher misalignments.

Gear couplings and common joints are utilised in comparable applications. Gear couplings have larger torque densities than common joints created to in shape a provided room while universal joints induce decrease vibrations. The restrict on torque density in universal joints is due to the constrained cross sections of the cross and yoke. The gear tooth in a equipment coupling have large backlash to enable for angular misalignment. The excessive backlash can contribute to vibration.

Each joint is made up of a one:1 gear ratio inner/exterior equipment pair. The tooth flanks and outer diameter of the external equipment are crowned to allow for angular displacement amongst the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are known as gears due to the fact of the fairly huge dimensions of the enamel.

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