YWZ9-300/E50A ELECTRO HYDRAULIC And DRUM BRAKE

The adjustment method of drum brake is to shrink the brake shoe, increase the gap between the brake shoe and the brake drum, and then apply the service brake to make the gap between the brake shoe and the brake reach the specified value.

When the push rod stroke of the brake air chamber is too large after the brake friction plate is worn, in order to reduce the gap between the shoe and the drum, only partial adjustment can be made by the cam.

The adjustment method is: firstly, rotate the worm shaft clockwise to eliminate the gap between the brake shoe and the brake drum, and then reverse the worm shaft to make the brake shoe and the brake drum reach the specified gap. During local adjustment, do not loosen the fastening nut of the brake shoe pin or change the installation position of the camshaft, so as not to damage the correct fit of the shoe drum. Adjustment of brake of self-adjusting mechanism of shoe drum clearance: Brake with self-adjusting forward braking clearance can return to the specified clearance when the braking clearance is greater than the standard.

However, when the car is braked for a long time or frequently, the temperature of the brake drum is high, and when heated, it expands greatly and decreases, resulting in the deformation of the hoof when it is opened, and the opening amount of the hoof increases, resulting in excessive self-adjustment. When the brake drum cools, the gap between the brake shoe drums becomes smaller, which will generate braking force.

The specified hoof-drum gap can be restored by braking.

In order to (2) adjust the brake with self-adjusting brake clearance for reversing quickly when the brake clearance is greater than the standard, rough manual adjustment should be made after the brake is completely modified.
What are the drum brakes?

Drum brake usually consists of brake drum, brake shoe and brake wheel cylinder that drives the brake shoe. The brake drum rotates with the wheel, and the brake shoes in it are pushed by the brake wheel cylinder to squeeze the inner surface of the brake drum, and the torque generated by friction prevents the wheel from rotating, thus achieving the purpose of braking.

As one of the two most common brakes at present, drum brake has a long history. In 1902, this design was applied to some carriages, and after the 1920s, cars that were still new things began to be applied. Drum brake usually consists of brake drum, brake shoe and brake wheel cylinder that drives the brake shoe.

The brake drum rotates with the wheel, and the brake shoes in it are pushed by the brake wheel cylinder to squeeze the inner surface of the brake drum, and the torque generated by friction prevents the wheel from rotating, thus achieving the purpose of braking. Drum braking mode is relatively closed. Therefore, after continuous high-intensity braking, the internal heat accumulation is more obvious, and the thermal attenuation phenomenon is more obvious than the disc brake mentioned later.

In addition, the brake powder produced by brake shoe friction after a certain mileage is also a disadvantage. When the brake drum is immersed in water, the efficiency of the drum brake is more obviously affected than that of the disc brake mentioned below. How to adjust the drum brake What are the drum brakes?

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