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By Jon R. Mancuso

"Second variation presents new fabric on coupling scores, normal objective couplings as opposed to specified function couplings, retrofitting of lubricated couplings to nonlubricated couplings, torsional damping couplings, torquemeter couplings, and more."

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3 1 ) are used primarily to accommodate misalignment and transmit power. Relative movement is accommodated by compression of steel bonded bushings. Small and medium-sized equipment employs these couplings. They are used to absorb energy and dampen loads, particularly when the equipment is engine-driven. 29 Block coupling. (Courtesy of Kop-Flex, Inc. 30 Jaw coupling. ) Overview of Couplings and Joints 49 Pin-and-bushing coupling. 31 C. Metallic Element Couplings (Disc Couplings) Disc couplings transmit torque by a simple tensile force between alternating driving and driven bolts on a common bolt circle.

Those between 100 and 1000 hp are classified a s medium: Usually those over 1000 hp are considered critical t o the operation of the equipment: these are covered in Section IV, Special-Purpose Couplings. 13 Miniature metallic beam coupling. 14 Miniature disc coupling. g.. a pump) shuts down, it usually does not affect the plant operation. This equipment uses a coupling with a flexible element that can be easily inspected and replaced and is therefore often considered a throwaway. The couplings are very flexible and require very simple alignment techniques, calipers, scales, and perhaps, if one gets sophisticated, a dial indicator.

If the misalignment is beyond 1/2" during operation, the flexible element may fail in fatigue. D. Miscellaneous Couplings 1. 36) transmit torque through a spiral-cut beam. The beams are shaped to allow torque to be transmitted in either direction. Misalignment is accommodated by deflection of the curved beam. Metallic beam couplings can accommodate misalignment up to 1/2". These couplings are used in small equipment applications. 2. 37) transmit torque through an intermediate square floating member and compensate for all three types of misalignments by sliding action between the closely fitted center member and the adjacent driving and driven jaw flanges.

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