. The Street railway journal . o valley Return Total time total energy The saving in power is estimated by the manufacturersto be equivalent to $260 per car per annum, in addition towhich there is a very considerable saving in the wear andtear occurring on ordinary brasses. The roller bearingsafter running 250,000 miles show an average reduction indiameter or wear of .005 to .008 ins. In considering the saving in power shown in the testsmentioned, other tests of roller bearings are interesting asconfirming the fact that a very large percentage of powermay be saved
. The Street railway journal . o valley Return Total time total energy The saving in power is estimated by the manufacturersto be equivalent to $260 per car per annum, in addition towhich there is a very considerable saving in the wear andtear occurring on ordinary brasses. The roller bearingsafter running 250,000 miles show an average reduction indiameter or wear of .005 to .008 ins. In considering the saving in power shown in the testsmentioned, other tests of roller bearings are interesting asconfirming the fact that a very large percentage of powermay be saved by a properly constructed anti-friction bear-ing. One test made by the Federal Government some timeago of an army wagon fitted with and without roller bear-ing axles demonstrated a saving ranging from about 52 percent up hill to as high as 75 per cent on an asphalt drive. It has been shown that an electric cab will run on one CURVES SHOWING CONSUMPTION OF POWER BY CARS No. 70 AND No. 37,ON TRIP FROM; CAR HOUSE TO ONONDAGA VAL. Time in Minutes. 17 18 19 ccC Ry, Journal COMPARATIVE POWER CONSUMPTION OF CARS WITH AND WITHOUT ROLLER BEARINGS- was made on a three-mile run, which is nearly straight charge from 25 to 35 per cent further with roller or ball except for one short 90-deg. curve. Car No. 70 was bearings than when using plain bronze bearings. In using equipped with roller bearings, while car No. 87 used the shafting hanger bearings a recent test showed that eighteen ordinary plain bronze bearings. The amperes and volts heavy grinding machines, using 49 hp with the plain bab- October 12, 1907. J STREET RAILWAY JOURNAL. 681 bitted bearing, used only 27 hp when roller bearing shaftinghangers were used. There are many advantages secured by the use of rollerbearings in addition to the saving in power above consumption of oil is much less than with fjronze bear-ings, and as the greatest saving by a roller bearing is in thestarting of the load the car starts much more g
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
