Experimental Investigation for Effect of Load and Speed on Automotive Drum Brake Shoe Interface

Abstract

Brake system is one of the vital systems in automobile from safety and performance aspect. In the present study, by using a pin-on-disc test rig, friction coefficient of old and new brake liner (sample 1 and sample 2 respectively) are investigated experimentally. Experiments are carried out for various pin which slides on disc under different load, sliding speed and track diameter. In this experiment, low to high speed range is covered by keeping constant sliding distance of 1000 m. Variations of coefficient of friction with the duration of interface at different loads; track diameter and sliding speed are studied. The obtained result shows that coefficient of friction reduces with the increase in normal load. It is also observed that friction coefficient decreases with rise in sliding speed. As the track diameter increases steady coefficient of friction is obtained with decreasing trend. For drum brake application steady friction coefficient is preferable for this purpose drum diameter should be high.

Keywords: coefficient of friction, brake liner, speed, load, track diameter