. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . c- FIG. 1. ELEVATION JOYS VALVE GEAR. IK, which are curved to a radius equalto the length of the rod G, connectingthe lever F to the valve spindle. Theselinks are attached to a shaft, L, Figs. 2and 3, corresponding to the ordinarylifting shaft of a link motion. The cen-ter of this shaft corresponds to the po-sition in which the fulcrum, F, of thelever, E, is represented in Fig. i. Theshaft, L, and the links can be partiallyrotated on the center of the former, sothat the slots in the links wil
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . c- FIG. 1. ELEVATION JOYS VALVE GEAR. IK, which are curved to a radius equalto the length of the rod G, connectingthe lever F to the valve spindle. Theselinks are attached to a shaft, L, Figs. 2and 3, corresponding to the ordinarylifting shaft of a link motion. The cen-ter of this shaft corresponds to the po-sition in which the fulcrum, F, of thelever, E, is represented in Fig. i. Theshaft, L, and the links can be partiallyrotated on the center of the former, sothat the slots in the links will be in-clined over to either side of a verticalposition, as shown at IV and X. Thisis done by means of an ordinary re- is admitted at each end of the stroketo the amount only cf the lead; and thisis done exactly equally on each side ofthe center line, the amount of lead be-ing constant for forward and backwardmotion, and for all degrees of expan-sion. Thus when the crank is set atthe end of the stroke either way, thecenter, F, of the valve lever coincideswith the center of the slot, and therefore. FIG. 2. PLAN OF JOYS VALVE GEAR. lively an elevation, plan a transversesection on XY of Fig. I looking forwardand modified arrangement of the gear. From a point. A, Fig. I, in the con-necting rod, motion is imparted to a vi-brating link, B, constrained at its lowerend, H, to move vertically by the ra-dius rod, C, which is pivoted at /. Froma point, D, on this vibrating link, B,horizontal motion is communicated to verse lever connected to the upper arm,M, attached to the shaft, L. When thelinks are thus inclined, the verticalmovement of the lever,- E, causes theblocks in the links and the center, F,to traverse a path inclined to a verticalcenter line; and to diverge from it toeither side. The center, F, therefore, hasa horizontal movement, the extent ofwhich depends upon the degree of in- FIG. 3. SECTION ON X Y. the slot may be moved over from for-ward to backward gear without affect-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
