. Railway mechanical engineer . TO Km. Per Hour. Fig. 4—Rolling and Total Resistance of Cars With Ball Bearings andJournal Bearings Fig. 4, these curves being the results of tests of cars withplain and ball bearings conducted on the Swedish state rail-ways. From these experiments modified on a basis of Stri-becks investigations of journal friction, the resistance curvesfor trains with disk bearings and with journal bearings havebeen derived as shown in Fig. 5. On the basis of a trainconsisting of an engine weighing 70 long tons with the weightof the tender and cars equal to 400 tons, operating
. Railway mechanical engineer . TO Km. Per Hour. Fig. 4—Rolling and Total Resistance of Cars With Ball Bearings andJournal Bearings Fig. 4, these curves being the results of tests of cars withplain and ball bearings conducted on the Swedish state rail-ways. From these experiments modified on a basis of Stri-becks investigations of journal friction, the resistance curvesfor trains with disk bearings and with journal bearings havebeen derived as shown in Fig. 5. On the basis of a trainconsisting of an engine weighing 70 long tons with the weightof the tender and cars equal to 400 tons, operating over agiven section of road, 200 kilometers long, the coal con-sumption was assumed to be kilograms per car axlekilometer ( lb. per car axle mile) and the price of coal E 2,000. 60 SO 100 Km. Par 5—Train Resistance With Journal Bearings and Disc Bearingsand Saving of Energy was taken at 155 kroner ($) per ton.* Assuming anannual traffic of 140,000 car-axle kilometers, the savingamounted to 983 kroner (about $) per car. On thisbasis, the saving would pay the cost of the new bearings inabout a year and a half, including the expense of periodicaloverhauling. In freight service, the percentage of coal saved would notbe so great as the distance traveled in a year by each carwould be less, but since the life of the bearings is likely tobe greater, it is believed that even on freight cars disk bear-ings would prove economical. With freight cars the ad-vantage of easier starting would assume greater importance. *The normal value of the kroner is about 26 cents and the present valueAbout 20 cents. In oiu traffic on the Swedish State Railways it has been estab-lished that the same engine with equal coal consumption isable to haul 28 or 33 cars pr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
