自動車用摩擦材に関する研究 : 第1報,ディスクブレーキ用パッドの鳴き

概要

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A device in which the sliding interface between a friction material and a brake disc can be observed directly, was developed to investigate the phenomenon of brake squeal with reference to the composition and method of manufacturing the disc brake pad. The results of investigation show that, in a disc brake pad which is liable to squeal, scales of thermally-decomposed material are produced easily on the frictional surface at a low temperature and with a small compression force. It was also ascertained that, when the quantity of inorganic substances in a brake pad is increased, the brake pad becomes liable to squeal; and that, when the void content of the brake pad is increased, the rate of generation of thermally-decomposed material on its frictional surface drops and the brake pad is very unlikely to squeal. These results prove that the degree of brake squeal is governed by the rate of deposition of thermally-decomposed materials on the frictional surface.
1985-06-25