The main components of the disc brake
Brake disc diameter
The diameter D of the brake disc should be as large as possible. At this time, the effective radius of the brake disc is increased, the clamping force of the brake caliper can be reduced, and the unit pressure and operating temperature of the pad can be reduced. Due to the limitation of the rim diameter, the diameter of the brake disc is usually selected to be 70% to 79% of the rim diameter. Cars with a gross mass greater than 2t should have an upper limit.
西藏11选5走势图 Brake disc thickness
西藏11选5走势图 The thickness of the brake disc has an effect on the quality of the brake disc and the temperature rise during operation. In order to make the mass smaller, the thickness of the brake disc should not be too large; in order to reduce the temperature, the thickness of the brake disc should not be too small. The brake disc can be made solid, or a ventilation tunnel can be cast in the middle of the brake disc for the purpose of heat dissipation and ventilation. The thickness of the general solid brake disc is 10-20mm, and the thickness of the ventilated brake disc is 20-50mm. The most commonly used brake disc is 20-30mm. When the brake is braked rapidly under high-speed motion, the brake disc will be thermally deformed and shaken. In order to improve the heat dissipation performance of the friction surface of the brake disc, most of the brake disc is made into a hollow hollow ventilated brake disc, which can reduce the brake disc temperature by 20% to 30%.
西藏11选5走势图 The friction pad refers to the friction material that the clamp piston pushes against the brake disc. The friction pad is divided into a friction material and a base plate, and both are directly press-fitted together.
西藏11选5走势图 The ratio of the outer radius of the friction pad only to the inner radius and the outer radius and inner radius of the recommended friction pad is not more than 1.5. If the ratio is too large, the outer edge of the pad will have a large difference with the inner peripheral speed at the time of working, the wear will not be uniform, the contact area will decrease, and eventually the braking torque will change greatly.
For the disc brake pad working area A, it is recommended that the vehicle mass per unit area of ??the brake pad be selected within the range of 1.6 to 3.5 (kilograms per square centimeter).
The brake discs are made of alloy steel and are fixed to the wheels and rotate with the wheels. The sub-pump is fixed on the bottom plate of the brake, and the two friction plates on the caliper are respectively installed on both sides of the brake disc. The piston of the sub-pump is acted by the hydraulic pressure transmitted by the oil pipe to push the friction plate to press the brake. The disc brakes frictionally and acts like a pair of pliers holding the rotating plate and forcing it to stop.