ANSI/AGMA 9104-A06 pdf free.Flexible Couplings – Mass Elastic Properties and Other Characteristics (Metric Edition).
The part of a coupling which provides flexibility. Various flexible element designs utilize a number of operating principles to provide flexibility. The design of this element determines the character of the coupling in terms of reaction forces, dynamics and reliability. For this standard, common flexible element types have been grouped into three major categories which are defined below. Note that the character of a particular flexible element type may cross or fall outside the definitions below. Also note the properbes of flexible elements themselves are not covered in this standard. The reader is directed to the appropriate coupling manufacturers for information on the properties of a particular type of flexible element.
2.1.2 Metallic element
A form of flexible e’ement which accommodates misalignment by material deflection of a metal or composite member. These elements are very much like springs in that they have a free form shape and will resist a change in shape with a reaction force. Examples of metallic elements are metal or composite contoured diaphragm, convoluted diaphragm and disc.
2.1.3 MechanIcal element
A form of flexible element which accommodates misalignment by sliding or rolling on mating surfaces. These parts normally require lubncation. These elements do not have a free state position. They can be at rest at any combination of axial and angular positions within their flexible capability. Mechanical elements resist change in axial and angular position mainly as a function of shaft torque and coefficient of friction between the mating surfaces. Examples of mechanical elements are gear, grid and pin-bushing.
2.1.4 Elastomeric element
These flexible elements are characterized by the use of an elastomer. There are many types of elastomeric elements which accommodate misalignment through varying degrees of material deflection and sliding motion. Reaction forces of these types of flexible elements are determined by element configuration, material stiffness, coefficient of friction and torque. They can be categorized into two general types, compression and shear, based upon the way torque is transmitted through the flexible element. Because of the great variety of designs some actually fit both categories in varying degrees.ANSI/AGMA 9104 pdf free download.