孔洞對實心煞車碟盤溫度之影響

Abstract

對於實心碟盤而言，盤面上之孔洞是一項常見之設計特徵。孔洞會減少碟盤之質量，使熱容量降低；孔洞也會改變總表面積大小，影響對流冷卻。由於孔洞同時對碟盤之儲熱與散熱能力造成變化，碟盤之溫度必定受到影響。本研究利用有限元素法，模擬數組不同鑽孔模式之碟盤模型，在不同車輛行駛模式下之溫度變化。再根據模擬結果推論孔洞對碟盤溫度之影響。本研究最後以一範例，展示不同之鑽孔模式，使碟盤保持在最高容許溫度以下，同時達成輕量化目標。

For the solid brake disc, cross drilling on the disc surface is a common design to reduce the total mass of the disc. These holes also change the total surface area of the disc and affect the convection capability. By altering both heat storage and heat dissipation simultaneously, the cross-drilled holes would definitely influence the disc temperature change during operation. In this research, finite element method (FEM) is used to simulate the disc temperature models of several discs with different hole patterns. The influence of the cross-drilled holes on the temperature change of the solid brake disc is thus found. In the end, an example is introduced to show how the hole pattern of a disc is modified so that the disc temperature is kept under the highest limit allowed.