. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . act of paper presented at the Seattle. Washington, meeting of theAmerican Society of Mechanical Engineers. engine, it was necessary to take advantage of every pos-sible means to improve the load characteristics of the carproper, especially with respect to starting and designers turned to anti-friction bearings as a pos-sible remedy. The application produced such remarkableresults not only in accelerating and starting, but in thematter of fuel economy and general operation, th
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . act of paper presented at the Seattle. Washington, meeting of theAmerican Society of Mechanical Engineers. engine, it was necessary to take advantage of every pos-sible means to improve the load characteristics of the carproper, especially with respect to starting and designers turned to anti-friction bearings as a pos-sible remedy. The application produced such remarkableresults not only in accelerating and starting, but in thematter of fuel economy and general operation, that thebearing engineers were encouraged to continue theirefforts to produce a bearing suitable for heavy railwayservice for by this time the requirements of the servicewas understood by them. They had also learned whatwould be necessary in the design and construction of thebearing itself. The Tapered Roller Bearing Principle The principal object of the tapered construction is toprovide capacity in the bearing for the thrust loads, whichexist in all railroad applications, with no appreciable sacri-. Fig. 1 — Diagram Showing Thory and Design of Tapered Roller Bearing fice in vertical load carrying power. Fig. 1 shows a Tim-ken roller bearing with an included cup angle of a littleless than 24 deg. Assuming a load of 100 unitsn^fi ap-plied radially or vertically to the roll, the normal pres-sure CB on the roll is 102 units. The thrust capacity ofthis particular roll is represented by the line AC and isequal to 20 units. By reason of the fact that only the toprolls in the bearing carry vertical load, the bearing has athrust capacity almost equal to its vertical capacity. Inother words, with an increase of two per cent in thenormal load on the rolls under vertical loading, a thrustcapacity equal to the vertical capacity is obtained. Byvarying the included cup angle the ratio of thrust to verti-cal or radial capacity can be changed over wide limits. Another advantage of the tapered
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
