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How Does The Train Brake Shoe Work?
Dec 14, 2017

Before you start, let's talk about the shoe.

Brake pads on the railway language called brake shoe,which is located in the wheel tread when to brake, through the role of the brake machine, will let the wheels before and after the two pieces of brake shoe wheel clamping, achieve the goal of parking.Need to brake the train running process, and the contact friction wheel tread, will train the kinetic energy into heat energy into the atmosphere, to train to slow down or stop the operation of the components, direct is the brake shoe friction wheel to make the train parking brake parts.A tile brake block made of cast iron or other material that holds the wheel on the side of the wheel while braking, causing the wheel to stop turning.The material can be divided into cast iron brake shoe and synthetic brake shoe.

Synthetic brake shoe.

Also known as non - metal sluice, it is made of asbestos and other fillings with resin or rubber as the adhesive.Synthetic brake shoes are also reinforced with steel backs.If the brake shoe is pressed into a flaky plate for disc shape movement, the brake plate is called.The synthetic shoe was first used on the London underground in 1907.Since the 1950s, applications have become more common.Synthetic brake shoe weight light, wear-resisting, brake when basically no spark.It with the coefficient of friction between the steel wheel, along with the change of speed increase and the change of the brake adhesive coefficient between wheel/rail, in order to better use of adhesion effect, improve the parking brake performance and shorten the braking distance.The synthetic brake shoe has high friction coefficient and low friction coefficient.High friction coefficient composition brake shoe friction coefficient is about twice that of cast iron brake shoe, can use the smaller the diameter of the cylinder and air cylinder, so as to reduce the weight of the foundation braking device, and can save the compressed air, more advantages.The low friction coefficient synthetic brake shoe can directly replace the cast iron brake shoe, suitable for the use of the old car.The fault of the synthetic brake shoe is that the thermal conductivity is poor, and the heat generated by friction increases the temperature of the tread surface of the wheel, even causing the hot crack when the tread surface appears local high temperature.In recent years, in order to avoid pollution of the environment, the synthesis of non-asbestos, lead-free and other hazardous materials has been adopted more and more.

So how does it work?

The braking principle of the train brake shoe: in the process of train braking, the braking device should transform the huge kinetic energy into the heat energy dissipating into the atmosphere.The quality of the braking effect depends mainly on the dissipation of the friction heat.When using this braking mode, the friction area of the brake shoe is small, and most of the heat load is borne by the wheel.The higher the speed of the train, the greater the heat load of the wheel during braking.If cast iron shoe, the temperature can make the brake shoe melt;Even with more advanced composition brake shoe, the temperature will be up to 400 ~ 450 ℃.When the temperature of the wheel tread is increased to a certain degree, it will cause the tread wear, crack or dissection, which affects the service life and the safety of the driving.It can be seen that the traditional brake shoe brake can't adapt to the need of high-speed train.