The Transmission of Power; By Leather Belting, Fibrous Ropes, and Toothed Gearing

The Transmission of Power; By Leather Belting, Fibrous Ropes, and Toothed Gearing

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...arm may be determined by considering it as a beam fixed at one end and loaded at the other with the force P due to the pull of the ropes. The bending moment on each arm will then be ' assuming that the load is divided equally among the number of arms, .V, and Z----the modulus of the section. For an elliptical section whose major axis is h and minor axis 0.4h, z = 'la-'.41., J2 hence if 1', the radius of pulley, be taken in inches, P1' 1r----f-.1. 18 M fix;... () For complete anal "s of st 'ns in fly-wheel rims, see Prof. Unwin's discussio 'n his "Machine Design," vol.I. Also, r. Stanwood's pa r" vol. '.Trans. A. S. M.., 'th Prof. Lanza's discussion. For experimental data see P. njam' 5 experiments, describ in American Machinist Sept. 22. 1898. If we let T1, the maximum tension in the rope, equal 200d" pounds, and T, +T2:2, we shall have the distributed load acting on the arms P: IOOd27l, where n is the number and d the diameter of ropes. Therefore by substituting this value of P in equation (18) there is obtained It is generally recognized that the load on a pulley rim is not evenly distributed among the arms, and that those arms nearest the load are subjected to the greater bending. This is allowed for in various ways but satisfactory results will generally be obtained by assuming the bending moment, as we have done, and selecting a sufficiently low value of f, to allow for the irregular distribution. Professor C. H. Benjamin considers the arm as a beam fixed at both ends, in which the bending moment is Pr'+2, but in order to compensate for the unequal distribution he assumes that the loao is carried by only one half the number of ar1ns. c Assuming that f:25o0 pounds per square inch for more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236992245
  • 9781236992246