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FIGURE 16.26 Exploded view of jaw-type compression coupling showing the two hubs and the flexible spider insert. (Lovejoy Inc.)
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FIGURE 16.27 (a) Loading of one cushion at distance Rc from the center of a compression block coupling; (b) parameters used to calculate shape factor S for materials such as rubber where load area is ab and force F compresses the material at a thickness t.
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The elastomeric elements can be of varying degrees of hardness or different materials to suit load-carrying capacities and temperature and chemical resistance requirements, in addition to torsional stiffness. Overall major dimensions may be altered by changing the number of active elements, element size, and radius on which the load is applied.The loading on one cushion is shown in Fig. 16.27a, and the torque rating of the coupling is T = NPARc (16.17)
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where T = torque, N = number of cushions, P = pressure, and Rc = centroidal radius. From Eq. (16.17) we can see that large couplings with many active elements are capable of handling very large loads. Typically, the design limit for rubber in com-
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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COUPLINGS 16.21
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pression is 300 pounds per square inch (psi), while a plastic like Hytrel is capable of 1100 psi. The recommended load capacity of some elastomers is dependent on the shape factor S, which is the ratio of one load area to the total free area of the cushion. See Fig. 16.27b. Thus S= ab 2t(a + b) (16.18)
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As this ratio changes from a thin plate (high S) to a fat block (low S), the maximum allowable stress E decreases, and the deformation of the block (compression) increases, as shown in Fig. 16.28.
FIGURE 16.28 How the shape factor changes the maximum allowable stress in 70 durometer (Shore A) rubber. (From Ref. [16.5], p. 77.)
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COUPLINGS 16.22
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The basic misalignment capacity of these couplings is determined by the mating tolerances of the two hubs, the elastomeric element, and the particular jaw design. The larger the difference between the cushion and the jaw dimensions, the greater the misalignment that can be accommodated without exerting undue reaction forces on the system. However, this arrangement also leads to noisy operation, pulsating power transmission, and the transmission of shock through the system. A tradeoff between these effects is made in the final design. Alternatively, thick blocks of material can be used and deformed under misalignment. This may cause high restoring forces but decrease noise and pulsation of power owing to loading and unloading of the flexible elements. These couplings exert some axial thrust with increasing torque unless special jaws are used. The shear unclamped coupling shown in Fig. 16.29 transmits power through shear in the elastomer, which can be rubber or a suitable plastic. Since rubber in shear can be loaded to only 20 percent of the load permitted on rubber in compression (70 versus 350 psi), the shear coupling is correspondingly larger in diameter and has a thicker element cross section than a corresponding compression coupling. The basic rating for this coupling type is T= t max(r 4 r 4) 0 i 2r0 (16.19)
These couplings may have both internal and external teeth in the hubs which mate to teeth in the flexible element, or the element may be bonded to the internal hubs and friction-fit into the outer hub (Fig. 16.30). For proper operation of the toothed-type coupling, the element must be twisted because of torque; this causes the gear teeth to rest properly. If the coupling is too large for a particular application (high service factor), the teeth will not load properly and the coupling will wear out prematurely. The toothed type of coupling is the double-engagement type and may allow more parallel and angular misalignment than a corresponding compression coupling. The bonded type is designed to slip when torque exceeds the maximum rating; however, the heat generated by prolonged overload will destroy the coupling. The
FIGURE 16.29 Shear unclamped coupling. (T. B. Wood s Sons, Inc.)
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