Though one may not think of gears to be versatile, gear couplings are extremely much considered to be a flexible coupling. A gear coupling is usually 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 are often connected by a third shaft called the spindle.
Each joint generally consists of a 1:1 gear ratio internal/external gear set. The tooth flanks and outer diameter of the exterior equipment are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equal to rotating splines with modified profiles. They are called gears because of the relatively huge size of the teeth. Gear couplings are generally limited to angular misalignments of 4 to 5°.
Gear couplings ordinarily come 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 therefore 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 one another, which are then enveloped by a sleeve. Generally, these sleeves are constructed with metal, but they may also be made of Nylon.
Single joint equipment couplings are accustomed to connect two nominally coaxial shafts. In this program the device is called a gear-type flexible, or flexible coupling. The one joint allows for minimal 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 designs – completely flexible and flexible/rigid. A totally flexible coupling comprises two hubs with an exterior gear and two outer sleeves with an internal gear. It’s a general coupling for a variety of applications and accommodates all feasible misalignments (angular, offset and combined) in addition to large axial moments. Devices, bearings, seals, and shafts are therefore not subjected to the excess forces, sometimes of considerable magnitude, which arise from unavoidable misalignment usually associated with rigid shaft couplings.
A flexible/rigid coupling comprises one flexible geared half and one rigid half. It does not support parallel displacement of shafts but does 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 allows to accommodate up to 1 1,5° static angular misalignment per equipment mesh. However, minimizing the operational misalignment will maximize the life of the coupling as well as 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 working misalignment will increase the life span of the coupling. Refer to the Installation and Alignment Guidelines for alignment recommendations.
Larger Bore Capabilities permit the most economical size selection for shafts up to 10 5/8″.
Higher Torque Ratings due to larger tooth pitch diameters than other couplings.
Versatility in that Series H’s are interchangeable by fifty percent 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 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 encounter hubs offer improved shaft misalignment capability
CENTER FLANGE BOLTING
All couplings feature precision-drilled flange bolt holes, and tight tolerance Grade 5 flange bolts to make sure a long-enduring flange to flange and fastener fit. Exposed bolt flanges are
standard. Shrouded bolt flanges can be supplied through size 5. Size #5 1/2 and larger couplings are only available with uncovered bolt flanges.
Each sleeve flange comes with two pipe plugs 180° aside. This permits assembly of a complete 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 recommended in order to obtain maximum operating life.
Ever-power COUPLING Features & Benefits
The Ever-power gear coupling comes in two basic products:
Ever-powercoupling for moderate to heavy-duty applications
Sizes 1 1/2 through 7 with integral end ring.
Sizes 8 through 30 with bolt-on end ring.