Why Do Cars Make a “Buzzing” Sound When Reversing?

There is a reason for both this sound and that harsh sound that sometimes comes out when shifting into reverse gear. Actually at this point everything gearbox due to gears.

forward gears have a different structure We see that the reverse gear does not have the same features, although we see that it works silently and more comfortably thanks to the

Let’s share a short video to remember what this sound is:

Why is there a strange noise when reversing in the car?

When we look at the transmission system of a vehicle, we see that the gears in the forward gear and the gears in the reverse gear have different shapes. Gears in forward gear”helical gearThey have a curved structure called “.

This slope allows more gears to engage during gear shifts. Also, thanks to the slope a smoother transition occurs and makes it work much quieter.

In reverse gears, there are spur gears instead of helical gears. spur gears, Instead of slipping like helical gears during engagement, they collide directly. This is the reason for that noise that occurs during gear shifting.

In addition, since it is not in a spiral structure like a helical spur gears have more backlash. This gap can also be shown as the reason for the buzzing sound that increases as the vehicle accelerates.

Why is the helical gear not used in reverse gear?

If helical gears make less noise and grip much better due to their curved structure, why? in reverse You can say that these gears are not used. The biggest disadvantage of helical gears is that it is difficult to switch between each other.

For this reason, forward gears are always stays connected and gear shifting is made possible by a piece called synchromesh. For this reason, spur gears are used instead of helical gears in reverse gears.