一区二区三区无码被窝影院,99久久免费精品高清特色大片,免费观看又色又爽又湿的视频软件 ,国产日产久久高清欧美一区

Home > News > Industry Information >

How does synthetic brake shoe work?

Apr 03, 2025

How does synthetic brake shoe work?

Brake pads are called brake shoes in railway terminology. The brake shoes are located on the tread of the wheels. When braking is required, the two brake shoes at the front and rear of the wheels clamp the wheels together through the action of a brake lever, achieving the purpose of parking. During the operation of a train, braking is required. Friction is generated when the train comes into contact with the wheel tread, converting the train's kinetic energy into thermal energy and dissipating it into the atmosphere. The braking components that directly rub against the wheels to stop the train are the brake shoes. A tile shaped brake pad made of cast iron or other materials, which holds the wheel tread tightly during braking and stops the wheel from rotating through friction. Brake shoes can be divided into two types based on their materials: cast iron brake shoes and synthetic brake shoes.

Composite brake shoes. Also known as non-metallic brake shoes, they are made by hot pressing asbestos and other fillers mixed with resin or rubber as adhesive. Synthetic brake shoes also need to be reinforced with steel backs. If the brake shoe is pressed into a sheet shape for disc braking, it is called a brake pad. Synthetic brake shoes were first used on London Underground vehicles in 1907. Since the 1950s, applications have become increasingly common. Synthetic brake shoes are lightweight, wear-resistant, and have almost no sparks during braking. The variation of the friction coefficient between it and the steel wheel with increasing speed is small, which is basically consistent with the variation of the braking adhesion coefficient between the wheel and rail. Therefore, it can better utilize the adhesion effect, improve braking performance, and shorten the parking braking distance. Synthetic brake shoes can be classified into high friction coefficient and low friction coefficient. The friction coefficient of high friction coefficient composite brake shoes is about twice that of cast iron brake shoes, and smaller diameter brake cylinders and auxiliary air cylinders can be used to reduce the weight of the basic braking device and save compressed air, with many advantages. Low friction coefficient synthetic brake shoes can directly replace cast iron brake shoes and are suitable for retrofitting old cars. The disadvantage of synthetic brake shoes is poor thermal conductivity, and the heat generated by friction increases the temperature of the wheel tread, even causing local high temperatures on the tread and leading to thermal cracking. In recent years, synthetic brake shoes free of harmful substances such as asbestos and lead have been increasingly adopted to avoid environmental pollution. So how does it actually work?

The principle of train brake shoe braking: During the braking process of a train, the braking device needs to convert enormous kinetic energy into thermal energy and dissipate it into the atmosphere. The quality of this braking effect mainly depends on the ability to dissipate frictional heat energy. When using this braking method, the friction area of the brake shoes is small, and most of the heat load is borne by the wheels. The higher the train speed, the greater the thermal load on the wheels during braking. If cast iron brake shoes are used, the temperature can melt the brake shoes; Even with advanced synthetic brake shoes, the temperature can reach up to 400-450 ℃. When the temperature of the wheel tread increases to a certain extent, it will cause wear, cracking or peeling of the tread, which not only affects the service life but also affects driving safety. It can be seen that traditional tread brake shoes cannot meet the needs of high-speed trains.


Contact Us
  • Tel: +86-0317-8196155
  • E-mail: 2461087283@qq.com
  • Add: Botou Industrial Zone, Hebei Province, China
Follow Us
主站蜘蛛池模板: 成人精品动漫一区二区| 老少交欧美另类| 久久精品一区二区三区四区| 中国农村熟妇性视频| 亚洲色婷婷一区二区三区| 国产欧美亚洲精品第1页青草| 裸体美女网站| a亚洲va欧美va国产综合| 男女做爰猛烈啪啪吃奶伸舌头下载 | 精品国产成人av在线| 欧美激情综合亚洲一二区| 国产又色又爽又刺激在线播放| 久久综合色老色| 精品国产免费观看久久久| 国产女厕所盗摄老师厕所嘘嘘| 久久亚洲人成电影网| 一本大道无码人妻精品专区| 野花社区视频www官网| 成 人 在 线 免费观看| 亚洲欧洲免费三级网站| 国产交换配乱婬视频| 中国大陆高清aⅴ毛片| 精品久久久久中文字幕加勒比| 国产suv精品一区二区88l| 浪潮av激情高潮国产精品| 亚洲乱码国产乱码精品精大量| 日韩av无码一区二区三区不卡| 国产在线偷观看免费观看| 麻豆国产尤物av尤物在线观看| 无码丰满人妻熟妇区| 成人免费午夜福利片在线观看| 国产性一交一乱一伦一色一情| 色多多www视频在线观看免费| 亚洲熟妇色xxxxx欧美老妇| 热久久视久久精品18| 国产亚洲精品aa片在线爽| 老少配老妇老熟女中文普通话| 精品免费人成视频网| 国产精品午夜无码体验区| 亚洲多毛女人厕所小便| 韩国国内大量揄拍精品视频|