. American engineer and railroad journal . passenger service. Two new engines of thisclass were assigned to passenger service on a division havinglong and heavy grades; before they had been in service threemonths the inside crank pins were in such a condition that theback and high pressure rod brasses had to be renewed afterevery alternate round trip. Occasionally an extra strong set ofbrasses would survive two round trips and still remain intact,but they would be sure to come in after the third, either brokenor burnt. Since the first balanced compound engines were built, the loco-motive build
. American engineer and railroad journal . passenger service. Two new engines of thisclass were assigned to passenger service on a division havinglong and heavy grades; before they had been in service threemonths the inside crank pins were in such a condition that theback and high pressure rod brasses had to be renewed afterevery alternate round trip. Occasionally an extra strong set ofbrasses would survive two round trips and still remain intact,but they would be sure to come in after the third, either brokenor burnt. Since the first balanced compound engines were built, the loco-motive builders of this country have made several improvements,which have lessened the inconvenience and expense of mainten-ance. One of these improvements is in the construction of thecrank axle (Fig. 1). Most of the balanced compound locomo-tives, which have been built recently, are equipped with crankaxles built up of from seven to nine separate pieces, pressed to-gether. This construction permits of the removal and replace- Cheett of cranked cu/c. bm atcrank kt~-Thconot:-. g/& Original center afcrcrk />. ■ Center of cram-74 trued up .. :• ^^M PcIOn at crank-pin worn ■■-■ r I Portion ofcrankpm removid in tram] up wtn a fik FIG. 3.—ILLUSTRATING THE WAY IN WHICH THE CRANK AXLE PINSWEAR OUT OF ROUND. ment by a new part, of any member of the axle which may be-come broken or worn out. With this axle, a broken or wornout crank pin does not mean that the whole axle must bescrapped, as is necessary whenever anything goes wrong withthe old solid forged axles. The axle shown in Fig. 2, known asthe semi Z crank axle, is of this type, and is an improvement onthe earlier form (Fig. la) which had two largs discs and a pinin place of the center forging. A still later improvement, made by the Baldwin LocomotiveWorks in the design of some large Prairie type balanced com-pound engines, recently delivered to the Santa Fe System, con-sists of the elimination of the bifurcated rods. The high
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
