1. Diameter of brake disc
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, which can reduce the clamping force of the brake caliper and reduce the unit pressure and working temperature of the pad. Depending on the rim diameter, the diameter of the brake disc is usually selected to be 70% to 79% of the rim diameter. Cars with a total mass greater than 2t should take the upper limit.
2. Brake disc thickness
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 quality 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 hole can be cast in the middle of the brake disc for heat dissipation and ventilation. Generally, the thickness of solid brake discs can be taken as 10-20mm, the thickness of ventilated brake discs can be taken as 20-50mm, and 20-30mm is more commonly used. In case of emergency braking under high-speed movement, the brake disc will be thermally deformed and tremble. In order to improve the heat dissipation performance of the friction surface of the brake disc, most of the brake discs are made into a ventilated brake disc with a hollow in the middle, which can reduce the temperature of the brake disc by 20% to 30%.
