Though one might not think of gears to be flexible, gear couplings are very much considered to be a versatile coupling. A gear coupling is 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 are often connected by a third shaft known as the spindle.
Each joint generally contains a 1:1 gear ratio internal/external equipment set. The tooth flanks and outer diameter of the exterior equipment are crowned to permit for angular displacement between your two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are known as gears because of the relatively large 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 brief sleeves encircled by a perpendicular flange. One sleeve is positioned on each shaft so the two flanges fall into line face to encounter. A series of screws or bolts in the flanges keep them together. Continuous sleeve gear couplings feature shaft ends coupled together and abutted against each other, which are then 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 called a gear-type versatile, or flexible coupling. The solitary joint allows for minor misalignments such as installation errors and changes in shaft alignment due to operating conditions. These kinds of gear couplings are usually limited by angular misalignments of 1/4 to 1/2°.
Gear couplings are torsionally rigid and are supplied to two styles – completely flexible and flexible/rigid. A totally versatile coupling comprises two hubs with an external gear and two outer sleeves with an interior gear. It’s a general coupling for all sorts of applications and accommodates all possible 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 considerable 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 half. It does not accommodate 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 teeth with a 20° pressure contact. This enables to accommodate up to 1 1,5° static angular misalignment per gear mesh. However, minimizing the operational misalignment will maximize the life span of the coupling and also the life of various 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 operating misalignment will increase the life span of the coupling. Make reference 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 bigger tooth pitch diameters than other couplings.
Versatility in that Series H’s are interchangeable by fifty percent coupling 
with competitive coupling styles.
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 type with flank, suggestion, and root curvature. When
used 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-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 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 complete flex coupling with four lube plugs positioned every 90°, facilitating lubrication. The lube seal is 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 operating life.
Ever-power COUPLING Features & Benefits
The Ever-power equipment coupling is available in two basic product lines:
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.