Single joint gear couplings are also employed to link two nominally coaxial shafts. In this software the system is known as a gear-kind versatile, or flexible coupling. The one joint permits for slight misalignments such as installation problems and alterations in shaft alignment owing to working conditions. These types of gear couplings are generally minimal to angular misalignments of 1/4–1/2°.

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

Gear couplings and universal joints are utilised in comparable purposes. Equipment couplings have greater torque densities than common joints designed to match a presented space whilst universal joints induce decrease vibrations. The limit on torque density in common joints is owing to the limited cross sections of the cross and yoke. The gear tooth in a gear coupling have large backlash to allow for angular misalignment. The surplus backlash can add to vibration.

Each joint is made up of a one:one equipment ratio internal/external equipment pair. The tooth flanks and outer diameter of the exterior gear are crowned to permit for angular displacement among the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are called gears simply because of the reasonably big size of the tooth.

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