u jing2Р (1. Tongji Univ. , Shanghai 200092 , China ; 2.Jiangsu Univ. of Sci. & Tech. , Zhenjiang 212013 , China)РAbstract : In calculating the braking torque of a brake , the braking efficiency method is often used. In thisРpaper , the formulae for calculating braking torque of leading shoe and trailing shoe brake are analyzed.РAlthough they are different in parameters , these formulae can be changed into the form which shows thatРthey are identical. In fact these formulae are all based on the same hypothesis , i. e. , both drum and shoeРare inflexible and the unit pressures between them are of sinusoidal distribution. Some proposals for theРchoice between them are also given at the end of the paper.РKey words : drum brakes ; braking torque ; braking efficiency method ; calculation method
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