The function of the brake air chamber is to convert the pressure of compressed air into the mechanical force that causes the brake camshaft to rotate, realizing the braking action. The brake air chamber is of the clamping diaphragm type. The size of the front and rear brake air chamber is different, but its structure is basically the same.
When the car brake, air from the air inlet into the brake air chamber, under the action of air pressure to make the diaphragm deformation, push the push rod, and drive the brake adjusting arm, turn the brake cam, the brake shoe friction plate pressure to the brake drum and produce braking.
The braking force of the diaphragm air chamber push rod is directly proportional to the input air pressure; the parking brake compartment is a brake device that uses spring energy storage and deflation. Inflatable pressure from the 12 mouth into the pressure chamber, resulting in the force acting on the piston, when the pressure is greater than 0.65MPa, the force acting on the piston is greater than the spring preload, the piston up to the limit, the brake is released; if the pressure chamber is completely deflated, the spring pushes the piston downward to push the main brake pusher to produce brakes, braking strength and spring preload; when the pressure chamber pressure is lower than 0.65MPa, the compartment produces braking force and the brake drum is produced. When the air pressure in the pressure chamber is lower than 0.65MPa, the braking force generated by the compartment is inversely proportional to the value of the air pressure, so the emergency brake can be implemented.