. The Street railway journal . ained, are formed on the hollow cast-steel shaft of the armature, and the external portionsare composed ofsplit bronze bear-ings, which fitsnugly into thefield housing. Theweight of the en-tire motor, there-fore, may be car-ried by the arma-ture shaft or bythe field structure,according to therelative values ofthe upward pres-sures exerted onthese members. The axle of thelocomotive passesthrough the arm-ature quill, andwhen actually con-centric with it, there is a clearance of about ^ in. on all sidesbetween the axle and the inside of the shaft. This allows asligh
. The Street railway journal . ained, are formed on the hollow cast-steel shaft of the armature, and the external portionsare composed ofsplit bronze bear-ings, which fitsnugly into thefield housing. Theweight of the en-tire motor, there-fore, may be car-ried by the arma-ture shaft or bythe field structure,according to therelative values ofthe upward pres-sures exerted onthese members. The axle of thelocomotive passesthrough the arm-ature quill, andwhen actually con-centric with it, there is a clearance of about ^ in. on all sidesbetween the axle and the inside of the shaft. This allows aslight movement of the armature, in respect to the axle, re-([uired l)y the flexible suspension of the motor which is aboutto 1)e described. On each end of the locomotive axle is mounted a wheel, in the hub of which are formed seven circularpockets which contain for assisting in carry-ing the weight of the motor and for transmitting the torquefrom the armature. Into each of these pockets there projects. er than the thickness of the stock from which the spring isbuilt. The convolution of the spring first touches the outercircumference, then passes inwardly and gradually approachesthe inner circumference, which is reached by the end of thesecond turn; it then gradually passes from the inner to theouter circumference, which latter is reached at the end of thefourth turn, and so on to the end of the spring. Between theouter circumference of the spring and the inner circumfer-ence of the pocket is fitted a sheet-iron tube, and a similartube is placed between the spring and the pin. These tubesand the spring form a unit which may be taken intact fromthe pocket when the outer end cap is removed. On account oftheir mechanical form and their position in the pockets, thesesprings cannot be stretched beyond their elastic limit, and,since each pocket is provided with adequate lubrication, it is FIGS. 6 AND 7.—END VIEM^ OF ECCENTRICSPRING AND SECTION THROUGHDRIVIN
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
