Document Z8nK5aDL0w9g26M7YoE4wegmL

As early as 1937 Caterpillar vas conducting research work to Identify operating characteristics of all knovm types of brake lining material. It. is. .a necessity that Caterpillar provide $ts_ customers vith the best performing, and safest brakes pos sible. So far, a material superior to asbestos-type that fulfills all the requirements needed for the heavy-duty brakes required on earthmoving equipment has not been found. TOROUE-TIME DIAGRAM FOR TWO DIFFERENT FRICTION MATERIALS TORQUE__________CURVJLA T ` J 'r'7"TTT BEGIN SUP TIME FIGURE NO. 2 TORQUE CURVES OF FRICTION MATERIALS Figure No. 2 Is a strip chart recording of the torque-time relationship for two different friction materials. These two % traces Illustrate the frictional behaviour throughout a brake application. In curve A, note the smooth deceleration or brak ing as the vheel speed Is reduced to zero, from beginning to end of stop. This Is one of the characteristics ve expect from asbestos--type materialOn the other hand, curve B of a non asbestos friction'material-shovrs undesirable speed change conditions. The trace exhibits considerable frictional vibration. This results '. 8001 0SBC i PROD1 lPF.n TTY FDPn