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SYHOWER of Working principle and structural characteristics of drum brake


The drum test brake is to install the friction pad of the Henan truck accessory manufacturer on the surface of the two arc brake shoes, take one end of the brake shoe as the support point, and increase the driving force from the other end to make the brake shoe press towards the inner side of the brake drum and brake. In the hydraulic mechanism pump, the piston rod of the Henan truck accessory manufacturer of the brake master cylinder immediately promotes the brake shoe; In the event of air impact braking, narrow air will promote the rotation of a camshaft to make the brake shoe extend outward. When the brake working pressure subsides, the return torsion spring pulls the brake shoe away from the brake drum, thus eliminating the brake.

Under certain shoe and drum position standards, the drum test brake can achieve full automatic force increase effect. Taking the rotation direction of the brake drum as the standard, if the reaction force end of the brake shoe is behind the front and support end of the car chassis, and the rotation angle of the brake shoe is the same as the rotation angle of the brake drum, then the brake shoe will automatically press the brake drum with a higher load under the effect of the sliding friction force of the Henan truck parts manufacturer, and can obtain strong braking. Such brake shoes are called auxiliary shoes. Naturally, because the car can move forward or backward, when the running angle of the brake shoe is opposite to the rotating direction of the brake drum, the friction force between the shoe and drum will be reduced. The burden of brake shoes is also reduced. Such brake shoes are called potential reducing shoes.

Structural characteristics of drum test brake

The drum test brake can be divided into several types, namely, auxiliary and reducing potential shoe type, double auxiliary potential shoe type, and double full-automatic force increasing type. The auxiliary and reducing shoe brakes are equipped with a double-piston rod brake master cylinder. No matter which direction the brake drum rotates, there is only one auxiliary shoe. Its structure is simple and its application is reliable to Henan truck parts manufacturer. The actual effect of braking will not change when the car is braked forward or backward. The key is to use the rear tire of the car. Double-assisted potential shoe brake uses front tires in cars. Generally, it is equipped with two single piston rod brake master cylinders, and the two brake shoes are connected according to the theme of the crankshaft. When the car is moving forward, the two brake shoes are all auxiliary shoes, but when the car is turning, the Henan truck parts manufacturers all become reducing shoes, and the braking effect is significantly reduced. The two brake shoes of the double full-automatic booster brake Henan truck parts manufacturer are connected with each other and supported by one component. The double piston rod brake master cylinder pulls the brake shoes to both sides. No matter which direction the brake drum Henan truck parts manufacturer turns, the full-automatic booster effect can be obtained. However, the brake is unstable and the functional demand for wear-resistant materials is high.

The drum test brake can have the effect of full automatic force increase, and the contact range between the brake drum and the brake shoe is large. The actual braking effect is good when the low Henan truck parts manufacturer is in the fast gear. However, because the brake shoe and drum are closed, the heat removal capacity is poor, and it is not suitable for fast and long-term continuous braking, and the actual braking effect will also be significantly reduced after the brake shoe friction pad is soaked.