. The street railway review . - low at hea\y loads andslow speeds, and rises to its highest at medium speedsand, medium loads. It again falls when running up tohigher speeds. For this reason it is more economical torun a geared motor not too fast nor too slow, but at amedium speed. This fact has been established longsince in the use of gears in other classes of machinerv,and in designing machinery where power must be trans-. mitted through gears. The best possible speed at whichgears are to be run, and the relation between pinion andgear, are carefuUj considered. In the single reductionmotor w
. The street railway review . - low at hea\y loads andslow speeds, and rises to its highest at medium speedsand, medium loads. It again falls when running up tohigher speeds. For this reason it is more economical torun a geared motor not too fast nor too slow, but at amedium speed. This fact has been established longsince in the use of gears in other classes of machinerv,and in designing machinery where power must be trans-. mitted through gears. The best possible speed at whichgears are to be run, and the relation between pinion andgear, are carefuUj considered. In the single reductionmotor we regain, we might say. more than half of this loss inefficiency, because the gears are run at a moderate think that this one feature of gear loss makes it desir-able to abandon their use in street car motors if we can save in practice 15 or more nearly 20 percent, of the power consumed in operating a street carmotor, by using the gearless instead of the double reduc-tion type, it is well worth while, as this means the con-sumption of less coal and the reduction of first cost inthe power plant and accessories. Figure 2 represents another set of curves developedin the same wa}^ as those shown in figure i. Threemotors were used in this test, the Double Reduction,Single Reduction and theGearless. In each case the 192 power brake was placed on the car axle. The DoubleReduction motor showing the effici
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
