This Standard defines standard classes of flexible coupling potentialunbalance, one of which theuser must select in order to meet the needs of his system. Thebalancing requirements for aflexible coupling depend upon the rotating system into which it ismounted. The balance classes arederived from consideration of the potential unbalance of the coupling.The AGMA method of computingcoupling potential unbalance is provided. A guide is provided forbalance class selection forpurchasers who have not defined the coupling balancing requirementsfor their system.
Application. This Standard is applicable to all flexible couplings,unless otherwise specified bythe individual manufacturer. It should be noted that a flexibleCoupling is generally an assemblyof several components having diametral clearance and eccentricitiesbetween the pilot surfaces.
Exclusions. This Standard does not address the unbalance effectscaused 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. ISO Standard 1940/1, Mechanical Vibration -Balance Quality Requirementsof Rigid Rotors – Part 1, Determination of Permissible ResidualUnbalance, may be used forbalancing coupling components and assemblies in the balancing machine.However, after the couplingis disassembled and reassembled either in the balancing machine or therotor system, significantpotential unbalances are introduced. These potential unbalances, asaddressed in this Standard, areprimarily the result of:
a. Balancing mounting fixture inaccuracies
b. Displacement of coupling components with respect to the axis ofrotation of the rotor systemduring disassembly and reassembly of the coupling.
- Edition:
- C90
- Published:
- 02/01/1990
- ANSI:
- ANSI Approved
- Number of Pages:
- 39
- File Size:
- 1 file , 2 MB
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