An Analysis Research on Thermal and Structural Breakdown due to the Lining Wear of Drum Brake

Abstract

Background/Objectives:A drum brake is used for strong braking forces at driving the car. This analysis study aims at investigating the thermal and structural characteristics of drum brake by shape.

Methods/Statistical Analysis: As the braking system for a car works by changing kinetic energy into thermal energy for braking, we employed the thermal and structural analyses to explain braking situations. After conducting these analysis techniques on models and A and B, both of whichhave different shapes, we compared theresultsto discern the structural characteristics. Based on the findings, the structural characteristics of the drum brakeswere examined by shape.

Findings: In this study, we conducted the thermal and structural analyses on drum brake discs. Models A and B variedin the thickness of lining. For model A, the thickness of lining was set to be 40mm, while it was 80mm for model B. From the thermal analysis, we discovered that model B was hotter than model A, which indicated that model B had a higher effect of heat dissipation. In the structural analysis, we confirmed the maximum equivalent stress points of models A and B. Both models had the maximum equivalent stress at the point where the lining and the inside of the drum contacted. The value of maximum equivalent stress on model A was 27.099MPa, while that of model B was 22.433MPa. This difference allowed us to infer that stress distribution varied depending on the liningthickness, and thus low stress could be resultant. Judging from these findings, we could see that the lining wear reduced the braking forces and heating values of the drum brake discs.

Improvements/Applications: When comparing the results, the lining thickness due to the wear atdrum brakes can be improved. Thesestudy result are thought to be appliedtothe actual design.

 Keywords: Drum brake,Lining wear, Thermal analysis, Structural analysis, Braking