. Railway mechanical engineer . simplifying the method offinding the proper diameter the diagram in Fig. 1 isoffered. upward to the top scales for projected area. The allowable piston thrust for crosshead pins is given as 4,600 and4,800 lbs., and for crank pins 1,600 and 1,700 lbs. There are several methods of calculating the diameterof main axles which are more complicated and involvedthan the method described. In each case a lower fiberstress is used in connection with the static load on the axleand the support of adjacent side rods, in connection with The diagrams are based on the following
. Railway mechanical engineer . simplifying the method offinding the proper diameter the diagram in Fig. 1 isoffered. upward to the top scales for projected area. The allowable piston thrust for crosshead pins is given as 4,600 and4,800 lbs., and for crank pins 1,600 and 1,700 lbs. There are several methods of calculating the diameterof main axles which are more complicated and involvedthan the method described. In each case a lower fiberstress is used in connection with the static load on the axleand the support of adjacent side rods, in connection with The diagrams are based on the following formulas: 1 liametei For Fig. 1 of axle, .1 =or Fig. 2—Fiber J ia. Cyl. + Yi in.)2 X .7854 X Boiler Pressure I 21,000 X ■lii I vl. i I in.)2 X .7854 X Boiler Pressure- li d3 X assuming a fiber stress of 21,000 lb. and ignoring the dead load or supportof adjacent side rods. 172 RAILWAY MECHANICAL ENGINEER Vol. it. No. 4 Diameter of Journals. ■ 8 9 2 .4 .6 .8 10 .Z .4 Boiler .6 .8 IZ 160 180 ZOO ZZO. 0 ■a IS «) s S IZ B 9 .Z .4 .6 .8 10 2 .4 6 Diameter of Journals. Fig. 1 — Diagram for Determining the Diameter of Driving Axle Journals Diameter of Main Driving ibz iz IIji ll JOji io H Boiler Pressure. 9 140 160 180 ZOO ZZO 1 / / 1 1 / * u 1 / -*- t—i « s— i o< L t A 22 / <« A 1 »J ^ 1 i -©— i.±r J \ / / / 1 / ■ /■ f / I / / i A\\y\\\\ / ^ 1 rft 1 / I f \\a\\\X\ A r o ^ y / / 1 / \ Y\ \ \ Y\ \ % A f / A \ \\A\ \ Ml &4 v S J / 1 i A f v / \ \\ / / SCJ23 / r* i r / / tf ^20 / 30 C 1 ■Q 1 \ X X w k-VA / 7 16 IS 14 13 1 2 -ft / A \ \ \ Lever Arm / \ \ \ \\ \ » M t\ \\ \ ♦ 34 \ \ \ \ . \ \ \ \ * \ \ \ \ ,\ \ / \ \ \ V / 3f> / / \ \ \ \ / 1 / > I3IZ^IZII^II I0z 10 9^ 29Z8Zfz6E5Z4Z3ZZ Lever Arm for Combined Twisting-and Bending: ,000130,000 IS,000 110,000 105,000 ■ 100,000 90,00085,00080,000IS,000 70,000 <dS,0OO e 0,000 I 0 1 Fig. 2—Diagr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
