5 Methods for Design and Machining of Gears to Reduce Gear Noise

Gears with correct pitch

Reducing the single pitch error and cumulative pitch errors can prevent the surface of meshing gears from colliding. As the pitch itself can't be tipped, correct gear cutting tools ought to be applied and hobbing with excellent precision should be used. Grinding and tipping are also important machining for creating more accurate pitch.

Tooth trimming for gears with a higher load

Tip relief profile modification is normally done only for reduction gears and spindle gears and not done for driven gears. When gears are tipped excessively, the noise becomes louder. It is normal to have a loud noise when the load is not added.

Chamfering on addendum

This machining process can be prevented gear collision on one hand and help the oil stay on the teeth surface for the lubrication purpose.

Increase the helix angle

The right-angle end surface of helical gears can have a stronger contact than the end face of the counterpart gear and create loads causing the gear to get bent. Increasing the helical angle could increase the contact ratio and reduce noise.

Change the pressure angles of driver and driven gears

Slightly reducing the pressure angle of the driver gear will allow more contact of the tops between two tooth surfaces. Increasing the pressure angle of the driven gear will create the same effect.