What are the advantages and disadvantages of disc and drum brakes?

1. Advantages and disadvantages of disc brakes Advantages: 1. Disc brakes have better heat dissipation than drum brakes, and will not cause brake recession and brake failure when continuously stepping on the brakes. 2. The disc braking system responds quickly and can do high-frequency braking actions, so it is more in line with the needs of the ABS system.

3. Disc brake does not have the automatic braking effect of drum brake, so the braking force of the left and right wheels is relatively average. 4. Due to the better drainage of the brake disc, it can reduce the situation of poor brake caused by water or sediment. Cons:

1. On heavy trucks, the braking effect is very stable within the normal standard load range. On the contrary, for heavy trucks with overload, the effect of disc braking will be greatly reduced. 2. The friction area between the brake pad and the brake disc of the disc brake is smaller than that of the drum brake, so that the power of the brake is also relatively 3

Brake pads are worn out and may be replaced more frequently. 3. Because the brake disc is exposed to the air for a long time, it will inevitably be corroded by water stains. 2. Advantages of drum brake drum brake 1. It has the effect of automatic brake enhancement, so that the brake system can use lower oil pressure, or use a brake drum with a diameter much smaller than the brake disc; 2. The processing and composition of parts are relatively simple, and the maintenance cost is low; Disadvantages of drum brake 1, the diameter of the brake drum of the drum brake will increase after heating, which will increase the stroke of pressing the brake pedal, and it is easy to cause the brake response to be less than expected; 2. The response of the braking system is slow, the pedaling force of the brake is not easy to control, and there is a problem of thermal decay, which is not conducive to high-frequency braking action; 3. There are many parts with complex structure, and the recovery of the drum brake is poor after water ingress; Extended information 1, the diameter of the brake drum of the drum brake will increase after being heated, which will increase the stroke of pressing the brake pedal, and it is easy to cause the brake response to be less than expected.

Therefore, when driving a vehicle with drum brakes, it is necessary to try to avoid thermal decay of brake pads due to high temperature caused by continuous braking. 2. The braking system responds slowly, and the braking force is not easy to control, which is not conducive to high-frequency braking action. 3. There are many parts with complex structure, and the brake clearance must be adjusted, which makes maintenance difficult.

The disc brake has stable efficiency, simple structure, convenient maintenance, good heat dissipation performance and superior expansion.

However, due to the poor performance of the house, it wears out quickly.

The advantages of disc brakes compared to drum brakes are:

1. The brake efficiency is less affected by the friction coefficient, and the braking efficiency is stable. 2. The braking efficiency does not decrease significantly after immersion, and it can be recovered after only one or two braking. 3. It has good self-cleaning ability and good heat dissipation performance.

The disadvantages of disc brakes compared to drum brakes are:

1. The manufacturing requirements for brakes and brake pipelines are high, and the consumption of friction pads is large and the cost is high. 2. Because the area of the friction plate is small, the working surface of the relative friction is also small, the required braking hydraulic pressure is high, and the vehicle must have a booster device to use it to make the efficiency low, so the pressure of the brake actuation pipeline required when used in the hydraulic braking system is higher, and the servo device is generally used. 3. When it is also used for parking brake, the parking brake device that needs to be installed is more complicated.

Advantages: (1) Stable braking efficiency.

2) Water recession has less impact.

3) Thermal recession has less effect.

4) In the case of re-output of the same braking torque, the size and mass are generally smaller.

5) It is easier to realize the self-adjustment of the gap, and its maintenance and repair operation is also simpler.

Disadvantages: (1) The braking efficiency is low, and the servo device is generally used.

2) When the pampa is used for parking brake, the transmission device added is more complex, so the application on the rear wheel is limited.

1. The advantages of disc brakes and drum brakes, drum brakes, drum brakes are cheap, and conform to the traditional design, for heavy-duty vehicles, because the speed is generally not very high, the durability of brake shoes is also higher than that of disc brakes, and in the case of obtaining the same braking torque, the diameter of the brake drum of the drum brake device is much smaller than that of the disc type, so many heavy-duty vehicles still use the design of four-wheel drum type;

2. Disc brake, disc brake has good heat dissipation performance and braking system.

The response is also relatively fast, and it can do high-frequency braking actions. Compared to drum brakes, disc brakes are simple in structure and easy to maintain. In the same size, due to the brake pads of the drum brake.

Compared with the contact area of the brake drum, the disc brake is larger, so the braking force of the drum is also larger;

3. The shortcomings of disc brakes and drum brakes, drum brakes, heat dissipation is much worse, secondly, the braking force stability is insufficient, the braking changes greatly on different road surfaces, and it is not easy to control, and it may cause brake recession and brake failure when continuously stepping on the brakes. In addition, after using the drum brake for a period of time, the gap of the brake shoe should be adjusted regularly, and even the entire brake drum should be removed to clean up the accumulated brake powder;

4. Disc brake, the cost of disc brake is more expensive, it is not suitable for some special environments, such as more sand and gravel, it will be easy to damage the brake disc.

In addition, the friction area between the brake pad and the brake disc of the disc brake is smaller than that of the drum brake, and the power of the brake is also smaller, and the wear of the brake pad is larger, and the frequency of replacement is higher.

Main composition: 1. Brake disc diameter.

The diameter of the brake disc d should be as large as possible, and the effective radius of the brake disc is increased, which can reduce the clamping force of the brake caliper, and reduce the unit pressure and working temperature of the pad. Subject to rims.

The diameter of the brake disc is usually selected as 70% to 79% of the rim diameter. Cars with a total mass greater than 2t should take the upper limit.

2. Thickness of brake disc.

The thickness of the brake disc has an impact on the quality of the brake disc and the temperature rise during operation. In order to make the mass smaller, the thickness of the brake disc should not be very large; In order to reduce the temperature, the thickness of the brake disc should not be too small. The brake disc can be made solid, or a ventilation hole can be cast in the middle of the disc for heat dissipation and ventilation.

The thickness of the solid brake disc can be taken as 10-20mm, the thickness of the ventilated brake disc is 20-50mm, and the more used is 20-30mm. Emergency braking in high-speed motion.

The brake disc will form thermal deformation and cause trembling. In order to improve the heat dissipation performance of the friction surface of the brake disc, most of the brake discs are made into ventilated brake discs with a hollow in the middle, which can reduce the temperature of the brake disc by 20% or 30%.

Disc brakes vs drum brakes, who is good and who is bad? You can see the 4 reasons as soon as you hear it.

The difference between disc brakes and drum brakes.

1. The drum brake is composed of two parts: the brake frame and the hydraulic tank, and the brake frame is composed of brake pads (for brake wear) springs and brake arms. The hydraulic tank is also called (hydraulic thruster) and it is composed of an effective electric motor and an oil pump. The drum brake is characterized by self-lubricating bearings installed at the main swing hinge points, which has high transmission efficiency and no lubrication in use.

Safe and reliable; High frequency of action, smooth braking and long life. Low maintenance cost and replaceable wearing parts.

2. Disc brake The structure of industrial disc brake is changeable, the braking is more direct, the structure is tighter, and the effect is more obvious. Disc brakes have a large braking force and are divided into auxiliary and protective. They indirectly or directly cause braking or deceleration of machinery.

In the event of overspeeding, it can be used as an emergency brake. It can be directly seen the gasket wear display, brake display and manual display. Special causes can also be addressed.

3. For example, QP pneumatic disc brake: QP series is spring brake, pneumatic release, simple overall structure, small size, light weight, green and environmental protection. The QP series is a disc type with torque adjustment for four-stage braking.

4. Their braking methods and forms are different. And the role and type of braking are also different.

First, the nature is different.

1. The rotating element in the friction pair of the disc brake is a metal disc working on the end face, which is called the brake disc.

2. The drum brake is to use the brake transmission mechanism to make the brake shoe press the brake friction plate on the inside of the brake drum, so as to generate braking force, and slow down the wheel or stop in the shortest distance as needed, so as to ensure driving safety and ensure that the car is parked reliably and cannot slide automatically.

Second, the performance characteristics are different.

1. The working surface of the disc brake is flat and heat is transmitted on both sides, the disc rotation is easy to cool, not easy to deform, the braking efficiency is relatively stable, and the braking effect is enhanced due to high temperature expansion after long-term use.

2. The drum brake has a large temperature difference between the inside and outside of the drum brake, which leads to the easy deformation of the brake drum, and at the same time, after long-term braking, the brake drum expands due to high temperature, and the braking efficiency is weakened.

Third, the disadvantages are different.

1. Disc brakes have their own defects. For example, the manufacturing requirements of brake and brake pipeline are higher, the consumption of friction plate is larger, and the cost is expensive, and because the area of friction plate is small, the working surface of relative friction is also smaller, the brake hydraulic pressure required is high, and the vehicle that must have a booster device can be used is less efficient, so the pressure of the brake actuation pipeline required when used in the hydraulic braking system is higher, and the servo device is generally used.

2. The braking efficiency and heat dissipation of the drum brake are much worse, the braking force stability of the drum brake is poor, and the braking force changes greatly on different road surfaces, which is not easy to control. And due to poor heat dissipation, a lot of heat will accumulate during braking. Under the influence of high temperature, the brake block and wheel drum are prone to extremely complex deformation, which is easy to produce brake recession and vibration, resulting in a decrease in braking efficiency.

In addition, after using the drum brake for a period of time, the gap of the brake shoe should be adjusted regularly, and even the entire brake drum should be removed to clean up the accumulated brake powder;

Answer: (1) The braking efficiency is stable.

2) Water recession has less impact.

3) Thermal recession has less effect.

4) In the case of re-output of the same braking torque, the size and mass are generally smaller.

5) It is easier to realize the self-adjustment of the gap, and its maintenance and repair operation is also simpler.

Advantages: 1) Generally, there is no friction to help the potential, and the efficiency is relatively stable.

2) The performance is reduced very little after water intrusion, and it only needs to be braked once or twice to return to normal.

3) When the braking torque is output, the size and mass are generally smaller.

4) The thermal expansion of the brake disc along the thickness direction is extremely small.

5) It is easier to realize the automatic adjustment of the gap, and other maintenance and repair operations are also called simple.

Disadvantages: 1) The efficiency is low, so the pressure of the brake line required for the hydraulic brake system is high, and the servo device is generally used. 2) When it is also used for parking brake, the parking brake transmission device that needs to be installed is more complex than the drum brake, so the application on the rear wheel is limited.

1.Advantages of disc brakes and drum brakes 1, drum brakes The cost of drum brakes is cheap, and in line with the traditional design, for heavy vehicles, because the speed is generally not very high, the durability of the brake shoes is also higher than that of the disc brake joker, and in the case of obtaining the same braking torque, the brake of the drum brake device.

2.Disadvantages of disc brakes and drum brakes 1, drum brakes heat dissipation is much worse, followed by braking force stability is not judged to be sufficient, braking changes greatly on different road surfaces, not easy to control, in the continuous step on the brake may cause brake decline and brake failure.