YWZ4 800/E301 ELECTRO HYDRAILIC AnDRUM BRAKE

Drum brakes are widely used and include many different types. In different applications, there are some differences in the structural forms adopted. and
There are also many kinds of classification methods. For example, according to the direction of brake shoe movement, drum brakes can be divided into internal tension type and external bundle type. It should be known that this type of brake actually obtains braking force by squeezing the brake drum with the help of brake shoes. In fact, the internal tension drum brake is widely used in modern cars with the inner cylindrical surface of the brake drum as the working surface. The outer beam brake mainly takes the outer cylindrical surface of the brake drum as the working surface.

At present,
It is only used as a parking brake for a few cars. In addition, it can also be divided according to the structural form of the actuating device. In kaiping machine, the drum brakes are divided into two types according to the different brake shoe opening devices.

Wheel cylinder brake and cam brake. Among them, the former uses hydraulic brake wheel cylinder as brake shoe actuating device, which is mostly adopted by hydraulic brake system. The latter is usually used as an actuating device, which is generally used in pneumatic braking systems. In addition, when classifying, it can also be classified according to the stress of the brake shoe. At this time, it can be divided into the following types: lead-follower type, double-follower type (one-way action, two-way action), double-follower type, self-energizing type (one-way action, two-way action) and so on. Below, we mainly introduce the characteristics of the lead-slave shoe brake for everyone.

Usually, the collar of the drum brake is fixed on the flange of the wheel flange from the brake drum of the shoe brake and rotates with the wheel. Comparatively speaking, this kind of drum brake has stable braking efficiency, simple and reliable structure and easy installation, and is widely used as front and rear wheel brakes of freight cars and rear wheel brakes of cars.

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