Single joint gear couplings are also utilized to connect two nominally coaxial shafts. In this software the system is named a gear-type flexible, or versatile coupling. The single joint allows for small misalignments this kind of as installation mistakes and alterations in shaft alignment thanks to working situations. These sorts of gear couplings are typically restricted to angular misalignments of one/4–1/2°.

Equipment couplings are usually restricted 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 universal joints are employed in similar programs. Gear couplings have greater torque densities than universal joints made to fit a provided area whilst common joints induce decrease vibrations. The limit on torque density in universal joints is due to the restricted cross sections of the cross and yoke. The equipment enamel in a gear coupling have high backlash to permit for angular misalignment. The extra backlash can contribute to vibration.

Every joint consists of a one:one gear ratio inner/external gear pair. The tooth flanks and outer diameter of the exterior equipment are crowned to enable for angular displacement amongst the two gears. Mechanically, the gears are equal to rotating splines with modified profiles. They are called gears simply because of the comparatively big dimension of the teeth.

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