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Though one might not think of gears to be versatile, gear couplings are very much considered to be a versatile coupling. A gear coupling can be a mechanical device made to transmit torque between two shafts that aren’t collinear. The coupling typically includes two versatile joints, one fixed to each shaft. These joints are often connected by a third shaft called the spindle.

Each joint generally includes a 1:1 gear ratio internal/external gear pair. The tooth flanks and outer size of the exterior gear are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equal to rotating splines with modified profiles. They are known as gears due to the relatively huge size of the teeth. Gear couplings are usually limited by angular misalignments of 4 to 5°.

Equipment couplings ordinarily come in two variations, flanged sleeve and continuous sleeve. Flanged gear couplings consist of short sleeves surrounded by a perpendicular flange. One sleeve is usually positioned on each shaft so the two flanges line up in person. A series of screws or bolts in the flanges hold them collectively. Continuous sleeve gear couplings feature shaft ends coupled together and abutted against each other, which are after that enveloped by a sleeve. Generally, these sleeves are made of metal, however they may also be made of Nylon.

Single joint gear couplings are used to connect two nominally coaxial shafts. In this application the device is called a gear-type flexible, or versatile coupling. The single joint allows for minimal misalignments such as for example installation mistakes and adjustments in shaft alignment because of operating conditions. These kinds of gear couplings are usually limited to angular misalignments of 1/4 to 1/2°.