. Railway mechanical engineer . ivers, while the reciprocating parts in oneweighed 16 per cent less than in the other. With the Pacifictype locomotives, the one with light reciprocating parts was16,600 lb. heavier on drivers and had 6,600 lb. greater trac-tive effort, while the weight of the reciprocating parts was ,■!per cent less than in the other. The results showed that in the case of the 2-10-2 typeengines, the maximum impact on the rail of the one withlight reciprocating parts was ,55 per cent less than that of theother. In both cases the speed was about 40 miles per the case of
. Railway mechanical engineer . ivers, while the reciprocating parts in oneweighed 16 per cent less than in the other. With the Pacifictype locomotives, the one with light reciprocating parts was16,600 lb. heavier on drivers and had 6,600 lb. greater trac-tive effort, while the weight of the reciprocating parts was ,■!per cent less than in the other. The results showed that in the case of the 2-10-2 typeengines, the maximum impact on the rail of the one withlight reciprocating parts was ,55 per cent less than that of theother. In both cases the speed was about 40 miles per the case of the Pacifies, the one with the light reciprocatingparts, though 10 per cent heavier on drivers than the otlier,produced less stress on track and bridges. By taking advantage of the greater strength of alloy andspecial steel forgings and castings to use increased unitstresses, by using hollow bored crank pins and piston rods,rolled steel or alloy and special cast steel pistons, and by ,< S5W- ;TaperV4inli \ Column f12,400°. ■Taper Win/Z Fig. 3—Design of Piston Rod of Annealed Carbon-Vanadium Steelfor 2-10-2 Type Locomotive special care in the design of all details, a large percentage ofsaving can be effected in the weights of reciprocating parts. By far the great majority of roads using alloy steel forg-ings have been content to utilize them to provide an increased III.—Weight of Parts of Three Classes ofPenxsylvania Locomotives. 4-4-2 4-6-2 2-S-2 Total weight 1b. 305,000 1b. 1b. Weight on drivers lb. lb. lb. Cylinders 23 J4 by 26 in. 27 in. by 28 in. 27 in. by 30 in. Diameter of drivers 80 in. 80 in. 62 in. Piston thrust 89,000 1b. 114,000 1b. 114,0001b. Weight of reciprocating parts per side 1b. 1,376 lb. 1,470 1b. Piston thrust per pound re-ciprocating weight 87 lb. 83 lb. 77 lb. factor of safety. Thr few cases in which advantage has beentaken of high tensile steels to reduce weights of reciproca
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
