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1概述120型制动机(以下简称“120阀”)是我国90年代研制和推广的新型货车制动机,采用模块化设计,属于二压力机构的直接作用式,与旧型制动机相比具有制动波速高;压力保持性好等特点,适用于重载及长编组列车。由于采用橡胶膜板代替了金属涨圈结构,其作用灵敏度和密封性能有较大提高,因此检修周期延长到了18个月。
1 Introduction The 120-type brake engine (hereinafter referred to as “120 valve”) is a new type of truck brake developed and popularized in China in the 90s. It adopts a modular design and belongs to the direct acting type of two pressure mechanisms. Compared with a high brake speed; pressure retention is good, suitable for heavy load and long grouping trains. Due to the use of rubber diaphragm instead of the metal ring structure, the role of sensitivity and sealing performance have greatly improved, so the maintenance cycle extended to 18 months.