New energy car favorite - drum brake disc brake VS drum brake What is the difference?
Release time:
Mar 27,2023
As we all know, in the present home car above, the brake method of choice is nothing more than disc brake (disc brake), and drum brake (drum brake), in the eyes of the vast majority of people, disc brake on behalf of high-grade, drum brake on behalf of backward, can practice is really so? Let's break them down one by one.
1. Disc brake (disc brake)
1. Components
Usually the main components of disc brake are: brake master pump, pump, brake disc, brake clamp, brake pad, oil pipe and so on.
2. Braking principle
The brake principle of the disc brake is very simple and very good to clarify, when the vehicle needs to slow down, the brake clamp will clamp the brake disc, after the brake pad and the brake disc the way to slow down the car, just like you can use two fingers to clamp a piece of paper. The brake clamp is propelled by the brake piston, which is powered by hydraulic pressure. In the process of braking, the original mechanical energy of the vehicle is converted into heat energy and then thrown away in the air.
Step 3: Advantages
Because the disc brake disc is exposed to the air, so in the process of driving the brake disc is directly air cooled, can be relatively active cooling, prevent the brake from showing thermal attenuation soon. There is a linear relationship between the force of the piston pushing brake clamp and the force of the driver stepping on the brake, and the driver can control the brake force more simply.
Step 4: Flaws
Only the choice of disc brake car needs to be equipped with a power system for the brake, because the driver's foot alone on the roots can not reach the brake demand in their strength, the vast majority of vehicle power system is relying on vacuum brake booster pump, vacuum force generally from the engine intake manifold of the negative pressure. This also explains the installation in the parking stall after the only time to "one foot brake", because the second foot of the brake has no power, then the brake pedal is as hard as a stone.
Two, drum brake (drum brake)
1. Make up some
Typical drum brake is mainly composed of baseplate, brake drum, brake shoe, wheel cylinder (brake pump), return spring, positioning pin and other parts.
2. Braking principle
The brake drum is mounted on the hub, is a part that rotates with the wheel, it is made of a certain amount of cast iron, the shape is like a drum. When braking, the cylinder piston pushes the press brake drum (inside), which is decelerated by a collision, forcing the wheel to stop rolling.
Of course, the processing and composition of the drum brake parts is simple, and then the production cost can be very good, which is why we think that the drum brake is simple and unconscionable elements of the address.
Step 3: Weaknesses
Because of a nearly closed brake drum, the heat dissipation of the drum brake is much worse than that of the disc brake. The diameter of the brake drum will increase after being heated, and then constitute the increase of the travel of the brake pedal, and the phenomenon of brake heat attenuation is very simple.
Due to the drum brake compared with the disc brake there is another seemingly not advantageous advantage - the return spring, due to the existence of the drum brake return spring, in no need of braking (release the brake), the brake shoe and the brake drum can be separated in an instant, a little won't waste the rated power, and the disc brake pad and the brake disc separation is not so fast, the waste of energy is small, But a pure electric car with a small capacity battery means it can go much further.
HEBEI XINGZHU MACHINERY MANUFACTURING CO. LTD