How does brake disc thickness relate to vehicle braking performance?
24
2024-10
Thicker brake discs have a greater heat capacity and can absorb more heat. In frequent braking or long time high intensity braking, thick brake disc heating speed is relatively slow, can effectively delay the occurrence of thermal recession phenomenon.
Brake disc thickness is closely related to vehicle braking performance, mainly in the following aspects:
Heat dissipation capacity
Thicker brake discs have a greater heat capacity and can absorb more heat. In frequent braking or long time high intensity braking, thick brake disc heating speed is relatively slow, can effectively delay the occurrence of thermal recession phenomenon. For example, in continuous downhill road conditions, thicker discs can better maintain the stability of braking performance, avoiding overheating leading to a significant decline in braking effect.
Thick discs have a relatively large heat dissipation area, so the heat can be more evenly distributed in the disc, and through the convection between the disc surface and the air and the heat conduction inside the disc, the heat can be dispersed more quickly. This helps maintain the normal operating temperature between the brake pads and the disc, ensuring stable friction and more reliable braking performance.
Braking torque
According to the principle of leverage, when the radius of the brake disc is certain, the thickness of the brake disc increases, and the contact area between the brake pad and the brake disc increases. When braking, the larger the contact area, the greater the friction generated under the same braking pressure, thus providing a greater braking torque and enabling the vehicle to decelerate or stop more quickly.
Thicker brake discs are able to withstand greater braking forces and are less likely to deform during high-intensity braking. This enables the braking system to function more stably during emergency braking or high-speed braking, ensuring effective transmission of braking force and improving braking accuracy and reliability.
Braking Stability
Thick brake discs have a larger mass and a larger moment of inertia. In the process of vehicle braking, the larger moment of inertia can make the rotation of the disc smoother, reduce the vibration and shaking caused by uneven wear between the brake pads and the disc or other factors, and improve the comfort and stability of braking.
Brake discs with greater thickness are better able to maintain their original shape and dimensional accuracy during long-term use due to relatively uniform wear. This helps to maintain the normal working clearance of the brake system, making the pressure distribution during braking more even, avoiding localized overheating or excessive wear, and further improving braking stability.
However, the thicker the brake disk, the better. Thick brake discs increase the unsprung mass of the vehicle, affecting handling performance and fuel economy. Therefore, when designing a brake system, vehicle manufacturers will take into account the vehicle's performance needs, overall quality, handling requirements and other factors to determine the appropriate thickness of the brake discs, in order to achieve the optimal balance of braking performance, handling performance and economy.
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