What is the Rear Axle Ratio?

[VanKayden]

Rear axle ratio is an important parameter of the engine, commonly known as the rear axle ratio, and its academic name is the final drive ratio. The rear axle ratio refers to the gear transmission ratio of the main reducer in the vehicle's drive axle. It is equal to the ratio of the rotational angular velocity of the driveshaft to that of the axle's half-shaft, and also equals the ratio of their rotational speeds. Additional information: 1. Speed ratio: The speed ratio of the vehicle's drive axle, also known as the speed ratio of the main reducer assembly, can be understood as the amplification of the torque transmitted from the driveshaft, indicating how much force is needed to propel the vehicle. 2. Higher ratio, higher torque: The larger the ratio, the greater the output torque, and the slower the output speed. To achieve greater power (torque) output for the vehicle, suitable for climbing or heavy loads, a relatively larger final drive ratio (e.g., 6.83) can be selected to meet the requirements, though this sacrifices speed. 3. Lower ratio, lower torque: The smaller the speed and torque ratio, the smaller the output torque, and the faster the output speed. By selecting a relatively smaller final drive ratio (e.g., 3.89), the need for higher speed can be achieved.