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Horizontal comparison of the popular air disc brake calipers

Jun,14,2022 << Return list

One year after the implementation of the national standard GB7258-2017, the horizontal comparison of the annual popular disc brakes


With the implementation of GB7258-2017 "Technical Conditions for Safe Operation of Motor Vehicles", it is newly required that all wheels of semi-trailers for transport of dangerous goods, three-axle balustrade and warehouse-type semi-trailers should be equipped with disc brakes (commonly known as "disc brakes"). , which will be referred to in the following text), disc brakes have stirred up waves in the commercial vehicle market and have become the focus of attention.


GB7258-2017 requires standard disc brakes to be divided into two categories according to the difference in focus. One is vehicles that have a major and bad social impact, such as special school buses, hazardous chemicals transport vehicles (including trucks and semi-trailers), large For passenger cars, the focus of this type of vehicle configuration with disc brakes is safety.

The other type is the fence-type and warehouse-gate trailers. These types of vehicles have a large number of vehicles and are seriously overloaded. The focus of configuring disc brakes is to control the excess.

Drum brake vs disc brake

Braking force: Generally, under the same disc diameter and drum diameter, the contact area between the drum brake friction pad and the brake drum is larger than the contact area between the disc brake friction pad and the brake disc, so a larger braking force is generated, that is to say Braking, which is also an important reason why drum brakes are widely used in commercial vehicles with large total mass at present.


Braking heat decay: Compared with the open structure of the disc brake, the closed structure of the drum brake has poor heat dissipation performance, which makes the drum brake more likely to generate heat recession during use, resulting in reduced braking efficiency and serious brake failure. For example, the 113 Lanzhou traffic accident in 2018 was a painful lesson that was shocking.


One year after the implementation of the national standard GB7258-2017, the horizontal comparison of the annual popular disc brakes

From the perspective of regulatory requirements and safety, it is not difficult to find that vehicle safety and standard-load operation are the general trend, so we should follow the trend and make adequate preparations in advance. Everyone chooses.


Knorr-Bremse SC7 disc brake with a braking torque of up to 27kNm


With the release of the national standard GB7258-2017, at the 2017 Chengdu International Auto Parts and After-sale Service Exhibition, KNORR carried the light-weight disc brake bright line.


One year after the implementation of the national standard GB7258-2017, the horizontal comparison of the annual popular disc brakes


At present, Knorr-Bremse commercial vehicles have been fully localized in China. The main products include: valves and electronic products required for the braking system, a full range of disc brakes, brake discs, and brake air chambers, which can provide high-efficiency and energy-saving products. Air supply products such as air compressors, air handling units and clutch actuating component systems.


One year after the implementation of the national standard GB7258-2017, the horizontal comparison of the annual popular disc brakes


The SC7 disc brake is a lighter disc brake system launched by Knorr-Bremse for the Chinese market.

This disc brake adopts ProTecS (double push disc) technology and adopts the structure of the compression spring system, which can effectively increase the average life of the brake pads in the case of poor road conditions. Sliding welded spring support blocks protect the compression spring and platen, reducing wear and damage.

The return of the ProTecS brake pads from the brake disc is easier due to the reduced coefficient of friction between the compression spring support block and the pressure plate. In addition, this disc brake adopts a lightweight design, with a self-weight of only 36.5Kg and a braking torque of up to 27kNm.

One year after the implementation of the national standard GB7258-2017, the horizontal comparison of the annual popular disc brakes

Knorr-Bremse pioneered the use of the double push-disc structure in the disc brake, which can make the output braking force more stable, thus helping to balance the wear difference of the edge of the friction lining. , It can also improve the driving safety of the vehicle and have more reliable braking performance.


SC7 series disc brakes are divided into three sizes: 17.5 inches, 19.5 inches and 22.5 inches according to the diameter of the rim. The larger the size, the greater the braking torque. They are suitable for light trucks, medium trucks and heavy trucks respectively. Currently, they are mainly equipped in FAW , Second Automobile, Foton and other heavy commercial vehicle fields.


One year after the implementation of the national standard GB7258-2017, the horizontal comparison of the annual popular disc brakes


Perhaps, many people will have doubts, every part of the disc brake is very important. Will the braking performance of the Knorr-Bremse SC7 disc brake be reduced to 36.5 kg? Of course not, because the maximum braking torque of this product is 27kNm. The picture below shows the brake test results, testing the braking distance required from 40 to 0km/h. Grey is the time it takes for competing products to brake at different temperatures and pressures, and blue is Knorr-Bremse disc brakes. Knorr-Bremse's brake discs and pads performed well in comparison tests with competitors' products, thanks to their optimised pairing of friction surfaces.


In addition to the above advantages, the SC7 air disc brake is designed with a friction disc wear alarm sensor. When the friction disc wears to the warning limit position, the sensor will feed back the information to the meter in time, thereby reminding the user to replace the brake pad as soon as possible, thereby improving driving safety. sex. In addition, the friction plate wear alarm can be equipped with on-off early warning and continuous alarm devices.

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Toget Brake

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