. American engineer and railroad journal . d essential featureof the four-cylinder balanced locomotive is the balancing ofthe reciprocating weights, and this may be done with cylindersof different sizes by making the large piston as light as pos-sible and adding to the small piston, or its crosshead, what- One of (Ik- priiuipal difficulties in a four-cylinder balancedlocomotive of tlic 46-2 type has been to secure a sufficientlength of main rod without using inclined cylinders or bifur-cated rods in order to clear the front axle. In this design, thishas been taken care of by making the distanc
. American engineer and railroad journal . d essential featureof the four-cylinder balanced locomotive is the balancing ofthe reciprocating weights, and this may be done with cylindersof different sizes by making the large piston as light as pos-sible and adding to the small piston, or its crosshead, what- One of (Ik- priiuipal difficulties in a four-cylinder balancedlocomotive of tlic 46-2 type has been to secure a sufficientlength of main rod without using inclined cylinders or bifur-cated rods in order to clear the front axle. In this design, thishas been taken care of by making the distance from the frontdriver to the center of the cylinders 12 ft. o in., which permitsa 92-in. main rod connected to the front drivers. In order to get as large inside cylinders as possible, the dis-tance between hubs on the front drivers has been made 56 13 in. diameter by ii-in. journals and 45-in. frame frame is offset I in. between the front and middle driv-ers, giving 43-in. frame centers, 12 in. x 12 in. journals and. riG. 2. ever weight is required to make the reciprocating weights forthe large and small cylinders equal. Having determined the weight on drivers and the tractiveeffort, the next step is to provide a boiler of sufficient capacityto supply the cylinders at the speeds required. Fig. 2, the general plan of the locomotive, shows a boiler 80in. in diameter at the first ring and 92 in. in diameter over thelargest course, which will contain about 250 214-in. tubes and27 5^8-i- tubes 21 ft. o in. long. The distance of 4 ft. 6 in. fromcenter of the cylinder to front tube sheet will give ample spacefor the superheater header without obstructing the draft. The3 in. o in. combustion chamber with 21 in. o in. flues and 4 in. from center of cylinder to front tube sheet and the slop-ing throat sheet give ample clearance over the rear drivers. Asuperheater has been included and is of such dimensions aswill probably give about 150° F. superheat and abou
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
