. Railway master mechanic [microform] . ( ft.) in the the fitting of the motors care was taken not to increasethe unsprung loads, which must be a minimum if shocks atthe rail-joints at high speeds are to be avoided. In the oldertype of engine this desideratum was secured by fixing thetwo motors rapidly inside the frame, and transmitting thetorque to the driving-wheels by cranks and same plan was adopted in the case of the new locomo-tives, but in view of the very long wheel-base some modi-fications were considered advisable. In the first place, it, will be seen tha
. Railway master mechanic [microform] . ( ft.) in the the fitting of the motors care was taken not to increasethe unsprung loads, which must be a minimum if shocks atthe rail-joints at high speeds are to be avoided. In the oldertype of engine this desideratum was secured by fixing thetwo motors rapidly inside the frame, and transmitting thetorque to the driving-wheels by cranks and same plan was adopted in the case of the new locomo-tives, but in view of the very long wheel-base some modi-fications were considered advisable. In the first place, it, will be seen that the cranks on the motor shaft are notcoupled to the wheel-crank by inclined connecting-rods, asin the old type of engine, but by a special frame. Eachpoint of this frame describes a circle in space, and hencehorizontal connecting-rods can be used by attaching themto suitable points in this frame. The tendency which in-clined rods have to make an engine ride on its springs isthus avoided. As already stated, the outer drive-wheels are. General Diagram, Simplon Tunnel Locomotive. mounted on radial trucks, and in order to avoid the use ofcoupling-rods, with an exceptional amount of slack, a some-what special system of transmitting the drive to this hasbeen adopted. The leading and trailing axles are hollow,being mounted on ball-bearings in the radial truck. Thecoupling-rods are connected to an independent shaft whichpasses through this hollow axle, and is mounted in the en-gine frame. The connection between this shaft and thehollow axle is such that a torque only is transmitted fromone to the other, the hollow axle and its wheels havingthus, though positively driven, a considerable degree of playrelatively to the engine framing. Since the new engines may occasionally have to work inconjunction with the older ones, they were also designedfor speeds of 70 to 35 kilometres per hour. The wheeldiameter being metres, and the drive being direct, thismeant that the number of revolut
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
