How much do you know about the braking system of a semi-trailer? Let me explain the principles of the two braking systems of a semi-trailer.
There are two braking systems for a semi-trailer, which are divided into feedback braking and emergency braking according to the working conditions. Feedback braking is also called inflation and safety braking. When the trailer air cylinder is inflated, the compressed air is divided into two paths from the filter. One path pushes the one-way valve open and enters the air cylinder through the air cavity. When the inflation pressure is low, the air pressure of the air cavity acts on the end face of the emergency piston. The force is not enough to overcome the expansion force of the balance spring, so the taboo piston is pushed to a very high position under the action of the balance spring. The other path enters the reaction air cavity of the taboo piston. When the rated safety air pressure reaches 450Kpa, the air pressure of the air cavity acts on the upper end face of the emergency piston. It is enough to overcome the expansion force of the balance spring, causing the emergency piston to move down, so that the intake valve and the exhaust hole are discharged into the atmosphere, and the safety brake is released. When the intake valve is in the open state, the exhaust valve is closed under the action of the recent valve return spring, and the compressed air in the air cavity enters the trailer brake air chamber of the air cavity through the intake valve, and the brake air produces a braking effect, which is the so-called semi-trailer safety brake.
After this explanation, is everyone clearer?
