Though one may not think of gears to be versatile, gear couplings are very much regarded as a flexible coupling. A gear coupling is certainly a mechanical device designed to transmit torque between two shafts that aren’t collinear. The coupling typically includes two versatile joints, one set to each shaft. These joints are often linked by a third shaft called the spindle.
Each joint generally contains a 1:1 equipment ratio internal/external gear pair. The tooth flanks and external diameter of the external equipment are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equivalent to rotating splines with altered profiles. They are known as gears due to the relatively huge size of the teeth. Gear couplings are generally limited to angular misalignments of 4 to 5°.
Gear couplings ordinarily can be found in two variations, flanged sleeve and continuous sleeve. Flanged equipment couplings consist of brief sleeves encircled by a perpendicular flange. One sleeve is positioned on each shaft so the two flanges line up face to encounter. A series of screws or bolts in the flanges hold them collectively. Continuous sleeve equipment couplings feature shaft ends coupled jointly and abutted against one another, which are after that enveloped by a sleeve. Generally, these sleeves are made of metal, but they can also be made of Nylon.
Single joint gear couplings are used to connect two nominally coaxial shafts. In this program the device is named a gear-type flexible, or versatile coupling. The one joint allows for minor misalignments such as for example installation errors and adjustments in shaft alignment because of operating conditions. These types of gear couplings are generally limited by angular misalignments of 1/4 to 1/2°.
Gear couplings are torsionally rigid and so are supplied to two styles – completely flexible and flexible/rigid. A totally versatile coupling comprises two hubs with an exterior gear and two external sleeves with an internal gear. It’s a general coupling for a variety of applications and accommodates all possible misalignments (angular, offset and mixed) in addition to large axial moments. Devices, bearings, seals, and shafts are therefore not subjected to the excess forces, sometimes 
of substantial magnitude, which arise from unavoidable misalignment usually associated with rigid shaft couplings.
A flexible/rigid coupling comprises one flexible geared fifty percent and one rigid half. It does not support parallel displacement of shafts but will accommodate angular misalignment. This type of couplings are primarily utilized for “floating shaft” applications.
Sizes 010 – 070 all have crowned tooth with a 20° pressure contact. This allows to accommodate up to at least one 1,5° static angular misalignment per gear mesh. However, minimizing the operational misalignment will increase the life of the coupling along with the life of other machinery components such as for example bearings etc.
SERIES H Features & Benefits
Higher Misalignment Capability
Sizes 1-7 compensate for ±1 1/2° static angular misalignment per gear mesh.
Minimizing working misalignment will maximize the life of the coupling. Refer to the Installation and Alignment Guidelines for alignment recommendations.
Larger Bore Capabilities allow the most economical size selection for shafts up to 10 5/8″.
Higher Torque Ratings because of larger tooth pitch diameters than other couplings.
Versatility in that Series H’s are interchangeable by half coupling with competitive coupling designs.
1 1/2° Curved-Face Teeth are a prime feature of the Series H coupling, sizes 1-7. The crowned hub teeth certainly are a 20° full-depth involute tooth form with flank, tip, and root curvature. When
used with the straight confronted sleeve teeth, these 1 1/2° curved face hubs offer elevated shaft misalignment capability
CENTER FLANGE BOLTING
All couplings feature precision-drilled flange bolt holes, and tight tolerance Quality 5 flange bolts to assure a long-long lasting flange to flange and fastener fit. Exposed bolt flanges are
standard. Shrouded bolt flanges could be supplied through size 5. Size #5 1/2 and bigger couplings are only available with exposed bolt flanges.
LUBRICATION
Each sleeve flange is supplied with two pipe plugs 180° apart. This permits assembly of a full flex coupling with four lube plugs positioned every 90°, facilitating lubrication. The lube seal is normally a Buna-N O-ring to help retain grease and exclude contaminants. KHP or KSG coupling greases are suggested to be able to obtain maximum working life.
Ever-power COUPLING Features & Benefits
The Ever-power gear coupling is available in two basic product lines:
Ever-powercoupling for moderate to heavy-duty applications
Sizes 1 1/2 through 7 with essential end ring.
Sizes 8 through 30 with bolt-on end band.