車輪への熱負荷軽減と制動性能を両立した合成制輪子の開発

摘要

踏面ブレーキに合成制輪子を使用する車両では，湿潤条件下で制輪子と車輪の間の摩擦係数が低下し，ブレーキ力が低下しやすい課題がある。とりわけ，編成両数が1〜2両のいわゆる"短編成車両"では先行車両による水切り効果が期待できないため，ブレーキ性能の低下が顕著になる。%In the railway vehicle using the composition brake shoe, there is a problem that the friction coefficient between wheel and brake shoe decreases under wet conditions, resulting in the reduction of the braking force. For the solutions to the problem, the metallic block for removing the water has been conventionally inserted. However, the metallic block will cause resulting in a local temperature rise on the wheel tread surface under dry conditions, which is one of the factors to cause wheel damage and wheel tread wear of concave shape. We have developed a composition brake shoe which can suppress the temperature rise of the wheel tread and maintain the brake force under wet conditions at the same time. In this paper, we report the summary of the evaluation of performance of composition brake shoe in dynamo test, running test and long-term durability running test, including the verification that the developed brake shoe has controlled concave wear.