Though one may not think of gears to be flexible, gear couplings are extremely much considered to be a flexible coupling. A equipment coupling is definitely a mechanical device designed to transmit torque between two shafts that aren't collinear. The coupling typically includes two flexible joints, one set to each shaft. These joints tend to be connected by a third shaft known as the spindle.
Each joint generally consists of a 1:1 gear ratio internal/external equipment pair. The tooth flanks and external diameter of the exterior gear are crowned to permit for angular displacement between the two gears. Mechanically, the gears are equivalent to rotating splines with altered profiles. They are called gears due to the relatively large size of one's teeth. Gear couplings are usually limited to angular misalignments of 4 to 5°.
Gear couplings ordinarily can be found in two variations, flanged sleeve and continuous sleeve. Flanged gear couplings consist of brief sleeves encircled by a perpendicular flange. One sleeve is placed on each shaft so the two flanges fall into line face to face. A number of screws or bolts in the flanges hold them collectively. Continuous sleeve gear couplings feature shaft ends coupled jointly and abutted against one another, which are after that enveloped by a sleeve. Generally, these sleeves are constructed with metal, but they can also be made of Nylon.
Single joint gear couplings are used to connect two nominally coaxial shafts. In this software the device is named a gear-type versatile, or versatile coupling. The one joint allows for small misalignments such as installation errors and adjustments in shaft alignment due to 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 are supplied to two designs - completely flexible and flexible/rigid. A completely versatile coupling comprises two hubs with an exterior gear and two outer sleeves with an internal gear. It's a universal coupling for a variety of applications and accommodates all feasible misalignments (angular, offset and combined) and also large axial moments. Devices, bearings, seals, and shafts are therefore not subjected to the additional forces, sometimes of substantial magnitude, which arise from unavoidable misalignment usually connected with rigid shaft couplings.
A flexible/rigid coupling comprises one flexible geared fifty percent and one rigid fifty percent. It does not support parallel displacement of shafts but will support angular misalignment. This kind of couplings are primarily utilized for "floating shaft" applications.
Sizes 010 - 070 all 
have crowned teeth with a 20° pressure contact. This allows to accommodate up to at least one 1,5° static angular misalignment per gear mesh. However, reducing the operational misalignment will increase the life span of the coupling as well as the life of various other machinery components such as bearings etc.
SERIES H Features & Benefits
Higher Misalignment Capability
Sizes 1-7 compensate for up to ±1 1/2° static angular misalignment per equipment mesh.
Minimizing operating misalignment will increase the life of the coupling. Make reference to the Installation and Alignment Instructions for alignment recommendations.
Larger Bore Capabilities permit the most economical size selection for shafts up to 10 5/8".
Higher Torque Ratings because of bigger 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 primary feature of the Series H coupling, sizes 1-7. The crowned hub teeth certainly are a 20° full-depth involute tooth type with flank, suggestion, and root curvature. When
used with the straight confronted sleeve teeth, these 1 1/2° curved face hubs offer increased shaft misalignment capability
CENTER FLANGE BOLTING
All couplings feature precision-drilled flange bolt holes, and tight tolerance Grade 5 flange bolts to assure a long-enduring 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 larger 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 can be a Buna-N O-ring to help retain grease and exclude contaminants. KHP or KSG coupling greases are recommended in order to obtain maximum working life.
Ever-power COUPLING Features & Benefits
The Ever-power gear coupling comes in two basic products:
Ever-powercoupling for medium to heavy-duty applications
Sizes 1 1/2 through 7 with essential end ring.
Sizes 8 through 30 with bolt-on end ring.