Does a Larger or Smaller Speed Ratio Save More Fuel?

[DeDaisy]

Smaller speed ratios save more fuel. Below are relevant details about speed ratios: 1. Definition of speed ratio: It refers to the gear transmission ratio of the main reducer in a vehicle's drive axle, equal to the ratio of the rotational angular velocity of the drive shaft to that of the axle's half-shaft, or the ratio of rotational speeds. When motors employ other speed control methods, such as variable frequency speed regulation or slip speed regulation, the ratio of the motor's maximum speed to its minimum speed is also termed the speed ratio, indicating the range of speed regulation. 2. Dual-speed ratio: Under no-load conditions, a smaller speed ratio is used to achieve fuel savings and extend the vehicle's service life. The development of dual-speed ratio heavy-duty trucks will be one of the future directions in the heavy-duty truck industry.