Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . the sake of completeness its equation is given, thus: AY = ^=Sc^?i«. (96) SD The internal moment of resistance of the shaft is -r-t-j hence the equation representing full equality of strength betweenthe shaft and the coupling, depending upon the shearing strengthcf the bolts, is: 5lR=-T-^- (97) MACHINE DESIGN 147 The theory pt the other types of couplings is obscure, excepta^ reg
Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . the sake of completeness its equation is given, thus: AY = ^=Sc^?i«. (96) SD The internal moment of resistance of the shaft is -r-t-j hence the equation representing full equality of strength betweenthe shaft and the coupling, depending upon the shearing strengthcf the bolts, is: 5lR=-T-^- (97) MACHINE DESIGN 147 The theory pt the other types of couplings is obscure, excepta^ regards the proportions of the key, which are the same in allcases. The shell of the clamp coupling, Fig. 52, should be thickenough to give equal torsional strength with the shaft; hut theexact function which the bolts perform is ditticult to general the bolts clamp the coupling tightly on the shaft andprovide rigidity, but the key does the principal amount of thedriving. The bolt sizes, in these couplings, are based on judgmentand relation to surrounding parts, rather than on theory. PRACTICAL nODIFICATION. All couplings must be madewith care and nicely fitted, for their tendency, otherwise, is to. spring the shafts out of line. In the case of tiie flange coupling,the two halves may be keyed in place on the shafts, the latter thenswung on centers in the lathe, and the joint faced off. Thus thejoint will be true to the axis of the shaft; and, when it is clampedin position by the bolts, no springing out of line can take place. A flange F (see Fig. 51) is sometimes made on this form ofcoupling, in order to guard the bolts. It may be irsed, also, to takea light Ijelt for driving machinery; but a side load is thereby thrownon the shaft at the joint, which is at the very point where it is desir-able to avoid it. The simplest form of rigid coupling consists of a plain sleeveslipped over from one shaft to the other, when the second is buttedup against the first. This is kn
Size: 2522px × 991px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmechanicalengineerin
