This Standard defines standard ciasses of flexible couplingpotential unbalance, one of which the user must select in order tomeet the needs of his system. The balancing requirements for aflexible coupling depend upon the rotating system into which it ismounted. The balance classes are derived from consideration of thepotential unbalance of the coupling. The AGMA method of computingcoupling potential unbalance is provided. A guide is provided forbalance class selection for purchasers who have not defined thecoupling balancing requirements for their system.
Application. This Standard is applicable to allflexible couplings, unless otherwise specified by the individualmanufacturer. It should be noted that a flexible coupling isgenerally an assembly of several components having diametralclearance and eccentricities between the pilot surfaces.
Exclusions. This Standard does not address theunbalance effects caused by such items as:
(1) Shaft runout
(2) Keys that protrude beyond the hub or shaft
(3) Unfilled keyways or keyseats
(4) Coupling mounting surface clearance
(5) Non-homogeneous materials
(6) Curved datum
Additional Considerations. IS0 Standard 194011,Mechanical Vibration – Balance Quality Requirements of RigidRotors – Part 1, Determination of Permissible ResidualUnbalance, may be used for balancing coupling components andassemblies in the balancing machine. However, after the coupling isdisassembled and reassembled either in the balancing machine or therotor system, significant potential unbalances are introduced.These potential unbalances, as addressed in this Standard, areprimarily the result of:
a. Balancing mounting fixture inaccuracies
b. Displacement of coupling components with respect to the axisof rotation of the rotor system during disassembly and reassemblyof the coupling.
- Edition:
- C90
- Published:
- 02/01/1990
- Number of Pages:
- 39
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