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Comparison of Disc Brakes and Drum Brakes

Active safety vehicles affect road safety to a large extent determined by the design of brake control. The effectiveness of the brake control is assessed by two indicators: the brake and developed by braking deceleration. Stopping distance is an integral indicator, and characterizes the work of slowing the vehicle brakes.
Comparison of drum and disc brakes
Wheel brakes provide a service and emergency braking, as well as keeping in place a stationary vehicle. The applied wheel brakes of various categories of vehicles are of two types of structures: drum brakes and disc brakes. Currently, the vast majority of cars have used by disc brakes on front wheels and drum brakes in the rear. In trucks and buses, as a rule, drum set drum brakes, which have the effect of self-empowerment and constructive manner compatible with a pneumatic actuator.
Becoming more common on vehicles (including trucks) are disc brakes. This is due primarily to their high operational stability. These inhibitory mechanisms provided by a slight drop in braking efficiency during the heating of water brake or hit the surface friction. In addition, they have less operating time, less weight and better cooling (open design, vented discs) compared to drum brakes. However, due to a smaller area of the friction disc pad pressure on them more than a factor of 3-4, the mechanism is open to dust and dirt. Therefore, the intensity of wear on the disk brake more than the drum. In this case the wear particles are emitted freely moving in the atmosphere.

Comparison of Disc Brakes and Drum Brakes
Disc brakes
 
  1. Brake disc;
  2. Rail pad;
  3. Support;
  4. Brake pads;
  5. Cylinder;
  6. Piston;
  7. Switch pad wear;
  8. O-ring;
  9. Guide the needle guard;
  10. Guide pin;
  11. Guard.

In the main part of a drum brake wear particles remain inside the drum, closed the brake shield. Through the vents into the air enters the drum at 10% of the total mass of products of friction. Equipment, vehicle anti-lock system leads to the fact that in the event of emergency braking the wheels are not locked and the relative displacement of the brake shoes and disc (drum) is maintained throughout the braking process. This leads to an increase in road friction brake friction elements, and hence the intensity of wear. According to the research process automation brake assist helps reduce the resource of the brake system, including brake pads; drum and disk wear by 10-30%.

Comparison of Disc Brakes and Drum Brakes
Drum brakes
  1. Nut mounting hub;
  2. Wheels;
  3. Reduce the coupling spring pad;
  4. Brake shoes;
  5. Command of the spring;
  6. Wheel cylinder;
  7. On the coupling spring;
  8. Type straight bar;
  9. Finger lever parking brake;
  10. Brake lever;
  11. Shield of the brake mechanism.

Drum brakes provide very high speed braking, however, with this kind of overheated brakes work extremely unstable. That is why modern car manufacturers in the design of their cars prefer the use of disc brakes.
The design of the drum brake is rigidly mounted on the wheel cylinder, resembling the drum, which, as a lid covering the entire brake assembly consisting of a brake cylinder and two pistons acting on the upper edge of the brake pads. During braking, the upper edge of the pad with force pressed against the inner surface of the drum and thereby slows down the rotation of the wheel or does it stop. After the cessation of inhibition, the locking spring is compressed between the pads themselves, pressing them against the drum and the wheel can rotate freely again.
To date, the open disc brakes completely replaced the drum on the front wheels of cars and continue to successfully displace them in the rear. With the growth of the dynamic properties of vehicles with solid disc brakes are gradually being replaced with ventilated disc brakes. Complete replacement of drum brakes until hinder mainly economic factors. Attempts to create alternative concepts of the brake disk have not yet yielded positive results. It is quite obvious that the main reason for changing the concepts of the brakes is to further increase cycling to work. Growth cycles of brake in turn require the ability to raise brakes, which is ensured by a sharp increase, effectively doubling the surface area of friction, which is both a cooling area of the rotor.

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