. Railway mechanical engineer . Fig. 9-—Rarchaerts Free-Axle Design experimental stage and none have come into general use. Thisis sufficient indication that their practicability is doubtful. Thefurther fact that other solutions of the problem, less expensiveand complicated, have been found would lead to the conclusionthat such schemes will probably never be adopted, their onlyadvantage being that all the axles can be driven from a singleset of cylinders. The weight and size of modern locomotives are so great thatthe cylinder diameters are now as large as road clearances willpermit. If larger
. Railway mechanical engineer . Fig. 9-—Rarchaerts Free-Axle Design experimental stage and none have come into general use. Thisis sufficient indication that their practicability is doubtful. Thefurther fact that other solutions of the problem, less expensiveand complicated, have been found would lead to the conclusionthat such schemes will probably never be adopted, their onlyadvantage being that all the axles can be driven from a singleset of cylinders. The weight and size of modern locomotives are so great thatthe cylinder diameters are now as large as road clearances willpermit. If larger locomotives are built, the application of twoor more sets of cylinders will probably be obligatory. If thenumber of sets of cylinders is increased the Mallet type is thelogical type to use, as no change in the customary construction. Fig. 10—Krauss Slotted Rod Arrangement of side rods, pins, etc., is necessary. In the Mallet type allnecessary flexibility that may be required on account of trackcurvature can readily be obtained, making it unnecessary toconsider further the flexible drive. Another reason why suchtypes are not likely to come into practical use is that the lossin efficiency would be greater than the loss due to carrying10 or IS per cent of the weight of the locomotive on truckaxles. C. J. Mellin: Various forms of gearing were among the first means sought to transmit motion from one set or groupof axles to another. This has probably been the most success-ful principle applied for this purpose. The application of chainsfor the transmission of power from one axle to another wasalso tried at an early date, but probably owing to defective orweak chains, it was abandoned at the outset and reintroduced ata comparatively recent time on log engines. A number ofsuch engines have been built and are reported gi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
