. The railroad and engineering journal . In practice it is found that the brakes on the engine arequite sufficient for the ordinary stops, and the brakes onthe train are kept as a reserve, to be applied in emer-gencies. Fig. 9 shows the relative position of the pinion teeth andthe teeth of the triple rack when the rack-rail is in this figure ./ ./ A are the sections of the pinion on the something is shown by fig. lo, which is a section (fullsize) of a tooth from a pinion on the locomotive Broiken,which had been in use, in regular service on the road forfour years. In this figure the out
. The railroad and engineering journal . In practice it is found that the brakes on the engine arequite sufficient for the ordinary stops, and the brakes onthe train are kept as a reserve, to be applied in emer-gencies. Fig. 9 shows the relative position of the pinion teeth andthe teeth of the triple rack when the rack-rail is in this figure ./ ./ A are the sections of the pinion on the something is shown by fig. lo, which is a section (fullsize) of a tooth from a pinion on the locomotive Broiken,which had been in use, in regular service on the road forfour years. In this figure the outer lines a a show theoriginal profile of tlie tooth ; the middle lines b b theprofile after four years service ; the inner lines c c the ex-tent to which the tooth can wear before the pinion must. main axle, and B B B those of the pinion on the , showing the position of the leclh on the sections i, 2,and 3 of the rack respectively. From this diagram thereason for the arrangement of the triple rack will be readilyseen. The bearing is so distributed over the teeth thatthere is no possibility of too great a strain being thrownupon any one tooth at any time, and danger from breakage be replaced. The full black portion on either side, be-tween the lines a a and b b, is the amount of metal wornaway in four years ; the heavily shaded portions, betweenb b and r c. the amount of metal which can still be wornaway before the pinion is thrown aside. In practice it hasbeen found hat the wear of all the teeth on the samepinion is nearly uniform. Vol. LXIV, No. 2.] ENGINEERING JOURNAL. 69 It may here be repeated that the diameter of the pinionsto pitch line is in. : over all, in. ; pitch ofteeth, in. ; width of teeth when new, • Thewear after four years was
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
