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Abstract：The brake disc of vehicles allows the brake caliper to clamp it for braking the Valdes through a friction action, during which the kinetic energy is converted into heat energy. When the vehicles are running at a normal speed, the brake pad and brake disc are actuated at approximate 100~1800C , or even up to 180~4000C in the even of high-speed running, primarily due to the friction between them. The friction is proportional to the product of the friction coefficient and the positive pressure applied vertically to the surface. A larger friction coefficient means a larger frictional force; however, the friction coefficient between the broke pad and brake disc will decrease with growing temperature generated from friction. Thus, a higher braking force and better heat-sinking capability of brake dies required to improve the running safety, The heal-sinking of the brake disc is conducted throng heat exchange of ambient air to improve the heat transfer efficiency and running stability, while a larger surface area of brake disc is required, or otherwise forced cooling will be effected at the center of the disc to promote the baling satiety. This study aims to examine the heal-sinking conditions in the ventilating duct of the brake disc to increase the authenticity and accuracy, then a vindicating disc of the same size is fabricated by Bakelite to conduct experiment with this radial rotary duct, and analyze the heat flux in the unit area of the cooling channel, so as to lean the heat transfer distribution and influences of temperature measurement pants in the measurement paints in the cooling channel within the rotary flow field. The experimental results can provide further understanding on the heat transfer characteristics of ventilating disc of brake disc at various speeds.
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建國科技大學 - 機械工程系製造科技碩士班(機械工程系/先進車輛組)