Electric vehicles are quiet. That is a good thing. But it also means you can hear every sound from the drivetrain. Gear noise that would be covered by engine noise in a gas car is very noticeable in an EV.
There are several ways to reduce EV gear noise. The first is to improve gear accuracy. More precise teeth mesh more smoothly and generate less noise. We can grind gears to tighter tolerances. The second is surface finish. Smoother surfaces reduce friction and noise. The third is gear design. Modifying the tooth profile or adjusting backlash can lower noise. The fourth is material. Some steels dampen vibration better than others.
We also recommend lapping for EV gears. Lapping gives a very smooth finish and improves the contact pattern. It costs more but is effective for noise reduction.
If you need a gear for an EV application, we can recommend the right combination of accuracy, finish, and lapping to keep it quiet.