ABSTRACT

The heat generated by friction between the brake shoes and brake drum during the braking process can increase the drum temperature, potentially reducing the performance of the braking system. One effort to improve heat dissipation is to add ventilation holes to the brake drum cover. This study aims to analyze the effect of ventilation hole diameter variations on the rear brake drum temperature of a 100 cc Honda Grand motorcycle. The research was conducted using an experimental method with ventilation hole diameters of 5 mm, 10 mm, 15 mm, and 20 mm, with the standard condition without ventilation holes used as a comparison. Each variation was tested in five repetitions at a speed of 60 km/h with a braking load of 2 kg. Temperature measurements were conducted using an infrared thermometer at four observation points after the motorcycle was allowed to rest for two minutes. Temperature distribution visualization was performed using ANSYS Workbench with the Steady-State Thermal method. The results showed that the larger the ventilation hole diameter, the lower the resulting brake drum temperature. The 20 mm ventilation hole diameter variation produced the highest temperature reduction effectiveness of 12.60% compared with the standard condition. The temperature distribution visualization using ANSYS Workbench showed a temperature distribution pattern consistent with the experimental results. Therefore, increasing the ventilation hole diameter was proven to improve heat dissipation, resulting in a lower operating temperature of the brake drum.

Keywords: brake drum, ventilation hole diameter, brake drum temperature, heat transfer, ANSYS Workbench.