During the driving process of the car, the brake is constantly used, resulting in the increase of the gap between the brake shoe and the brake drum, so that the braking gap cannot be fed back in time, resulting in a long braking stroke, a long parking handle, and a soft brake. and other problems, threatening driving safety, and the existing technology mostly manually adjusts the gap between the brake shoe and the brake drum, which is inconvenient to operate.
analyze:
External factors (road surface, speed and cargo capacity), as we all know, the force and speed of the four wheels of the vehicle on different roads and curves are inconsistent, which will lead to differences in braking force, and eventually lead to the situation that the brake shoes are worn out. .
Internal factors (electronic systems)
Nowadays, many trucks are getting more and more high-end, most of them are equipped with ABS system, and some are equipped with EBD (Electronic Brake Force Distribution) and ESP (Electronic Body Stability System), so the braking force of each wheel is distributed according to demand.
EBD refers to electronic braking force distribution. Its function is to calculate the friction force values of the four tires at high speed due to different adhesion at the moment of braking, and adjust the braking device to make it move according to the set program. High-speed adjustment, to achieve the matching of braking force and friction, to ensure the stability and safety of the vehicle, edb can be said to be an auxiliary function of abs in essence.
ESP mainly controls the stability of the vehicle to ensure the normal driving of the vehicle on the road. When the tires of the car are about to lock, the body electronic stability system will use the "mechanical point brake" to brake hundreds of times within 1 second, so that the driver can keep the steering wheel to control the vehicle after fully pressing the brake. The direction of travel is very similar to the function of ABS.
Self-tuning principle:
Under the factors of the above two points, the braking force of the four wheels is different, so that the brake shoes cannot be used absolutely evenly, resulting in the wear of the brake shoes, which will cause the dangerous situation of the truck dragging / partial braking
The quality clearance self-adjusting brake wheel cylinder can stably maintain the gap between the brake shoe and the brake drum at a distance of 0.6-1mm through its own self-adjusting mechanism. Keep a total of 8 brake shoes of the front and rear axles in the most stable working state forever