. The railroad and engineering journal . TER VII. THE STEAM-ENGINE. One of the principal organs of a steamengine is the crank, as it is by means of itthat the reciprocating motion of the pistonis convened into the rotary motion of theshaft. In this country the cranks of sta-tionary engines are generally made of castiron. Figs. 1S6 and 187 are front and sideviews of such a crank for an engine* witha lo-in. cylinder and iSin. stroke. Such cranks should be proportioned tothe diameter of the shaft, which is repre-sented by D in the engravings. The radiusof the crank is the distance from the cen-te
. The railroad and engineering journal . TER VII. THE STEAM-ENGINE. One of the principal organs of a steamengine is the crank, as it is by means of itthat the reciprocating motion of the pistonis convened into the rotary motion of theshaft. In this country the cranks of sta-tionary engines are generally made of castiron. Figs. 1S6 and 187 are front and sideviews of such a crank for an engine* witha lo-in. cylinder and iSin. stroke. Such cranks should be proportioned tothe diameter of the shaft, which is repre-sented by D in the engravings. The radiusof the crank is the distance from the cen-ter of the shaft D to the center C of thecrank pin, and is equal to half the slrokeof the pision. The throw of the crank isequal to twice its radius, and to the strokeof the thickness T of the boss on the shaft is equal to D, the di-ameter of the shaft. The diameter .4 of this boss is equal to i\times D. No exact rule can be given for the diameters d ofcrank-pins, as practice varies within wide limits. The general Fig. 186 * The following description of keys is taken from Rippers ing Machine Draw- CRANK. Scale lft. tendency with all classes of engines is to increase the diametersof the pins. In the present instance, </ of the pin C is 2i in. di-ameter, and its journal is the same length. The diameter a of * This and the following iliuslialions in this chapter are taken from drawingsof a stationary engine built by the Fishkill Landing Machine Company atFishkillon Hudson, 5i8 THE RAILROAD AND [November, i8po. crank-pin boss is made 2j linus li that of the crankpin, and tin-tliiekiiess t of the boss is l\ d. The outline of the crank arm may be drawn by laying off fromthe center of the shaft on a horizontal center line passingthrough ita distance <■ ./ equal to twice the tiiametsr of the shalt,and from the center of the crank pin laying off a similar dis-tance, e f = to twice the diameter ol the crank-pin, and draw- lines, as shown at G
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
