. Automotive industries . accompanying cut. Itconsists of a 2.\i x 14-in. brake drum such as is used onDodge cars, arranged to be driven by any convenientmeans, such as an ordinary automobile engine. Bearingon the drum are two external shoes to which the samplesof lining to be tested are riveted in the conventional shoes are carried by a linkage (as shown in thecut) one end of which forms a brake arm resting on plat-form scales used to measure the torque applied by tight-ening the hand wheel, at the other end of the linkage. Aspring balance placed between the upper and lower mem-bers s
. Automotive industries . accompanying cut. Itconsists of a 2.\i x 14-in. brake drum such as is used onDodge cars, arranged to be driven by any convenientmeans, such as an ordinary automobile engine. Bearingon the drum are two external shoes to which the samplesof lining to be tested are riveted in the conventional shoes are carried by a linkage (as shown in thecut) one end of which forms a brake arm resting on plat-form scales used to measure the torque applied by tight-ening the hand wheel, at the other end of the linkage. Aspring balance placed between the upper and lower mem-bers serves to measure the total pressure exerted on thetwo brake shoes. It will be seen that the apparatus issimply a prony brake, by means of which the power in-put to the brake facing is readily measured. The fac-ings are each cut of such length as to cover one quadrantof the drum. Tests have been made at selected con-peeds fn>m 200 to 1000 and with a stand-ard input varying from 4 to 15 hp., the given power being. [pparatua red for texts of brake lining maintained by applying to the brake shoes the necessarypressure by turning the hand wheel. The linings are run until worn away to one-half theiroriginal thickness, the power absorbed and the time re-quired for wear being measured. These tests are beingtried with various power inputs and various speeds inorder to determine the speed and power which will en-able a fair comparison to be made of wearing qualitywithout requiring an undue amount of time for the a sufficient number of tests have been made on thevarious makes of lining it is proposed to establish astandard test, the application of which will make itpossible for users of brake lining to intelligently specifythe properties that an acceptable lining must have. Atpresent so many kinds of tests are employed that the lin-ing manufacturers find it impossible to predict in ad-vance what performance can be expected of their prod-uct. Some tests have been made,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
