摩擦特性に優れた鋳鉄複合化制輪子の開発

摘要

Alloy cast-iron brake shoes are inferior to the other kinds of brake shoes in frictional force, while are advantageous in terms of constant adhesion and a less degree of attack to wheels. We improved the frictional property of the alloy cast-iron brake shoes by combining filters made of SiC (silicon carbide), which has the effect to increase the frictional force of the cast-iron brake shoes. Because the hardness of SiC is much greater than that of the wheels, the amount of the filters to be used and the position of the filters on the frictional surface were optimized in order the degree of attack to wheels not to increase. We performed full-scale tests and on-track tests of the improved brake shoes, and then confirmed the effect of the filters that improved the frictional property.%従来から使用されてきた鋳鉄制輪子は，車輪踏面を適 度にあらすため車輪/レール間の粘着力が安定して得ら れる，雨や雪の影響を受けにくい，車輪の温度上昇や踏 面損傷等の車輪への攻撃性が低いといった良好なブレー キ性能を持つことから，現在でも北海道など雪の多い地 域で使用されている。