What does speed ratio mean?

The speed ratio is the meaning of the transmission ratio of the automobile. The English of the speed ratio is the transmitting ratio of tnotor, which refers to the ratio of the speed of the two transmission mechanisms before and after the transmission in the automobile transmission system. The transmission ratio will affect the torque and speed of the vehicle. The specific effect will be introduced below.

Take a truck as an example. The truck gearbox has many gears. The larger the transmission ratio, the greater the torque, but the speed is not high. The transmission ratio of the first gear is the largest. After a smooth start, many trucks can only run to a maximum speed of 20KM/hour in the first gear.

When the gearbox pinion drives the large gear to rotate, the transmission ratio is relatively large, and when the large gear drives the pinion to rotate, the transmission is relatively small. The function of the main reducer gear in the car differential is to decelerate and increase the torque. The speed of the engine is very high. It needs the gearbox and the main reduction gear to reduce the speed so that the vehicle can drive normally.

If a car has high horsepower and a small speed ratio, it will be difficult to start, because the torque of the small speed ratio is also small, but when the speed reaches a certain speed, it will run faster than a car with a high speed ratio, because the horsepower represents The speed at which the engine does work. It can be understood that the torque determines the speed at the start, and the horsepower determines the speed of continuous acceleration, so the driver should choose the appropriate speed ratio according to his own driving conditions.


Post time: Oct-25-2022