In brief: The all-rounder – the 1-speed gearbox
How power is transmitted to the wheels
As the speed of the drive system increases, the force transmitted to the wheels – the torque – can vary. With a vehicle with a combustion engine, the torque increases along with the engine speed and then falls again. With an electric drive system, however, the maximum torque is available immediately and remains constant over a wide range of speeds.
One gear for every situation
That is why a 2-stage 1-speed gearbox is used in the Volkswagen ID.3. In order to achieve the maximum power of 150 kW, the electric drive unit must rotate at high speeds. As a result, the electric drive motor in the ID.3 provides the maximum torque of 310 Nm constantly over a wide range of speeds. The maximum speed of 160 km/h is reached at a maximum of 16,000 rpm. For the ID.3 which is optimized for maximum range, the use of a single gear for all driving situations is perfectly adequate.
Precision manufacturing makes the e-vehicle particularly quiet
Because an electric drive system is very quiet, the level of noise in an e-vehicle is very important. The parts for the 1-speed gearbox must therefore be manufactured with great precision to ensure that they do not cause any additional noise. At the end of the production line, not only the power characteristics of the electric drive system are checked – the relevant noise values are too. All drive systems for European and North American e-vehicles based on the MEB – including the 1-speed gearbox – are manufactured at the component plant in Kassel.
Feb 26, 2020 at 16:09