This article mainly introduces the disc brakes and drum brakes of electric vehicles. First, it introduces the structure and advantages and disadvantages of the disc brakes of electric vehicles. Secondly, it introduces the advantages and disadvantages of drum brakes of electric vehicles. Finally, it explains the difference between disc brakes and drum brakes of electric vehicles. And which is a good answer, follow the editor to learn more about it.

Introduction to disc brakes of electric vehicles

Disc brakes, also known as disc brakes, consist of a brake disc connected to the wheel and a brake caliper on the edge of the disc. Disc brakes can be divided into mechanical disc brakes and hydraulic disc brakes. The working principle of the disc brake system is to install a disc that rotates synchronously with the wheel on the hub, and install a caliper on the front fork and the frame, and then clamp the disc through the brake block in the caliper to achieve the purpose of braking. .

Disc brake structure of electric vehicle

Disc brake is also called disc brake. The disc brake disc pushes the brake caliper through a hydraulic pump to hold the brake disc tightly. The braking force of the brake is different from that of a hub brake. It is more linear and will not increase suddenly. In order to increase the braking force, the method of increasing the braking area is generally adopted. For example, the use of dual-piston calipers is to increase the braking contact surface. You can also increase the pressure by lengthening the brake arm, or by amplifying the pressure of the hydraulic pump.

Advantages and disadvantages of disc brakes for electric vehicles

Advantages: high braking sensitivity, automatic gap adjustment, long shoe life, low braking effort, high cost, high requirements on the hydraulic system, easy maintenance, and fast heat dissipation.

Disadvantages: improper use, easy to lock, tires slip, and are greatly affected by external factors (it is snowy in the north, and the snow on the road has melted, but when it is thrown on the car, it will freeze. If it is thrown on the disc brake, it will be caused by the disc There is a layer of ice on the film and the brake fails temporarily. The car will not, because the ice will melt because of his braking torque. When riding, it will make a little noise because it is in close contact.

Introduction to Drum Brakes for Electric Vehicles

Drum brake is a brake device that uses the stationary brake pads in the brake drum to rub the brake drum that rotates with the wheel to generate friction to reduce the rotation speed of the wheel. When the brake pedal is stepped on, the force of the foot will cause the piston in the brake master cylinder to push the brake fluid forward and generate pressure in the oil circuit. The pressure is transmitted to the brake cylinder piston of each wheel through the brake fluid, and the brake cylinder piston pushes the brake pads outward, causing friction between the brake pads and the inner surface of the brake drum and generating sufficient friction to reduce the rotation speed of the wheels. In order to achieve the purpose of braking.

Advantages and disadvantages of electric car drum brakes

advantage:

1. The drum brake has a good self-brake effect. Because the brake is used to stretch the film, the wheel rotates and the brake drum is twisted at an angle (of course not so large that you can easily see it). The brake is used to make the film out. The greater the tension (brake braking force), the more obvious the situation. Therefore, generally large vehicles still use drum brakes. In addition to the lower cost, the difference between the drum brakes of large and small vehicles may only be the large-scale pneumatic assistance. Small cars use vacuum assistance to help brakes.

2. Lower cost: Drum brakes have a lower manufacturing technology level and are the first to be used in brake systems, so the manufacturing cost is lower than that of disc brakes.

3. The hand brake mechanism is easy to install. Some models with disc brakes on the rear wheels will install a drum brake hand brake mechanism in the center of the brake disc.

shortcoming:

1. The diameter of the brake drum of the drum brake will increase after being heated, which will increase the stroke of stepping on the brake pedal, and it is easy to happen that the brake response is not as expected. Therefore, when driving a vehicle with drum brakes, it is necessary to avoid continuous braking that causes the brake pads to thermally degenerate due to high temperatures.

2. The brake system reacts slowly, and the pedaling force of the brake is not easy to control, which is not conducive to high-frequency braking actions.

3. There are many parts with complex structure, and the brake clearance must be adjusted, which makes maintenance difficult.

What is the difference between disc brakes and drum brakes of electric vehicles

Disc brakes and drum brakes: Disc brakes are also called hydraulic brakes or oil brakes; drum brakes are a traditional braking method that uses friction between the brake pads and the drum to decelerate. Generally, vehicles on the market use disc brakes for the front wheels and drum brakes for the rear wheels. , The so-called "front disc and rear drum" configuration. Disc brakes are not used on the rear wheels because of cost issues. Many of them are front and rear disc brakes.

Disc brakes are better than drum brakes. The larger the diameter of the brake disc, the better, the more pistons of the caliper, the better, and the lighter its weight, the better.

The brake shoe of the drum brake is divided into the leader shoe and the follower shoe, and the leader shoe can automatically increase the force. There are two brake shoes on one wheel. It is generally in the form of a lead hooves, but there are also double lead hooves or double hooves. Sometimes the brake will make a squeaky sound, which is the sound of the leading shoe. Although the braking force is large, it will damage the brake shoe.

Drum brakes also have their own advantages. In addition to low cost, under the same diameter conditions, the absolute braking force of drum brakes is greater than that of disc brakes. Drum brakes can increase the braking force by turning the wheels forward. Of course, the drum brake is easier to lock, and the heat decays faster.

The biggest difference between drum brakes and disc brakes (disc brakes) lies in the problem of heat dissipation. Drum brakes do not dissipate heat well during high-speed driving, and heat accumulation is easy to cause heat exhaustion of the brake part and weaken braking force. Disc brakes have good ventilation and fast heat dissipation. It is not easy to produce heat exhaustion.

In addition, the caliper type of disc brake, the brake pad and the disc are in flat contact, the contact surface is large, the time is consistent, and the braking is rapid; the drum brake pad and the brake drum are in curved contact, from point to surface, the braking efficiency is relatively low.

Which is the best disc brake or drum brake for electric vehicles

Disc brakes for electric vehicles are better than drum brakes: disc brakes are better.

In recent years, with the emergence of luxury models, electric motorcycles, and cool cars, disc brakes in the electric vehicle industry have become the standard in the field of brake systems for the entire industry. The important point is that because electric vehicles are used more frequently in braking, they will generate a lot of heat during use, which will seriously affect the braking performance. Disc brakes have good heat dissipation and less thermal degradation, so they are more suitable for electric vehicles with high braking frequency. Motorcycles and cool cars. Nowadays, drum brakes are generally lower-priced electric vehicles. Because the cost of disc brakes is more expensive than drum brakes from a certain perspective.

In order to save costs, some models usually use the front disc and rear drum mode, because the braking pressure of electric vehicles is mainly concentrated on the front wheels, and the front wheels will naturally use disc brakes. In fact, in terms of the effect of a single use, the difference in braking power and safety between the two will not be too great.

As the main tool for people to travel, electric vehicles have become an indispensable means of transportation for people. As a brake system that affects the safety of life and property, whether it is disc brakes or drum brakes, it is the enterprise that puts the safety of consumers in the first place. The way out for future development!