Though one might not think of gears as being flexible, gear couplings are extremely much regarded as a flexible coupling. A gear coupling is normally a mechanical device designed to transmit torque between two shafts that are not collinear. The coupling typically consists of two flexible joints, one set to each shaft. These joints tend to be connected by a third shaft called the spindle.
Each joint generally includes a 1:1 gear ratio internal/external equipment pair. The tooth flanks and external diameter of the exterior gear are crowned to allow for angular displacement between your two gears. Mechanically, the gears are equal to rotating splines with altered profiles. They are known as gears due to the relatively huge size of one’s teeth. Gear couplings are generally limited by angular misalignments of 4 to 5°.
Gear couplings ordinarily come in two variations, flanged sleeve and continuous sleeve. Flanged gear couplings consist of short sleeves encircled by a perpendicular flange. One sleeve is positioned on each shaft therefore the two flanges fall into line face to face. A series of screws or bolts in the flanges hold them jointly. Continuous sleeve equipment couplings feature 
shaft ends coupled collectively and abutted against each other, which are after that enveloped by a sleeve. Generally, these sleeves are constructed with metal, but they may also be made of Nylon.
Single joint gear couplings are accustomed to connect two nominally coaxial shafts. In this program the device is named a gear-type flexible, or versatile coupling. The single joint allows for minor misalignments such as for example installation errors and changes in shaft alignment because of operating conditions. These types of gear couplings are usually limited to 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 completely flexible coupling comprises two hubs with an exterior gear and two outer sleeves with an interior gear. It’s a common coupling for all sorts of applications and accommodates all feasible misalignments (angular, offset and mixed) and also large axial moments. Devices, bearings, seals, and shafts are therefore not put through the additional forces, sometimes of considerable magnitude, which occur from unavoidable misalignment usually associated with rigid shaft couplings.
A flexible/rigid coupling comprises one flexible geared fifty percent and one rigid fifty percent. It does not accommodate parallel displacement of shafts but does support angular misalignment. This type of couplings are primarily used 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 maximize the life span of the coupling as well as the life of 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 working misalignment will maximize the life of the coupling. Refer to the Installation and Alignment Instructions 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 for the reason that Series H’s are interchangeable by fifty percent coupling with competitive coupling designs.
1 1/2° Curved-Face Teeth certainly are a primary feature of the Series H coupling, sizes 1-7. The crowned hub teeth are a 20° full-depth involute tooth type with flank, tip, and root curvature. When
used in combination with the straight faced 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 bigger couplings are only obtainable with uncovered bolt flanges.
LUBRICATION
Each sleeve flange comes 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 certainly a Buna-N O-ring to greatly help retain grease and exclude contaminants. KHP or KSG coupling greases are suggested in order to obtain maximum working life.
Ever-power COUPLING Features & Benefits
The Ever-power equipment coupling comes 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 ring.