The principle of gear noise generation of planetary reducer

This paper makes an in-depth analysis of the generation principle of the gear noise of the planetary reducer proposed by some new users, and proposes a solution.

The principle of gear noise generation of planetary reducer

(1) Planetary gears and sun gears and ring gears, high-speed shafts and high-speed quilt moving shaft gears are continuously impacted during the meshing process, causing the gears to generate forced vibrations at the meshing frequency.

(2) During the rotation of the planetary carrier, due to the eccentric unbalanced force, the gears generate low-frequency vibrations consistent with the rotational speed.

(3) When the gear is subjected to the external exciting force, the frequency generated will generate noise during the transient free vibration of the natural frequency of the gear. The natural frequency of the gear is related to the structure and quality of the gear itself.

(4) The friction between the teeth will cause the gear to generate self-excited vibration, which will cause friction sound.If the tooth surface is uneven, it will cause periodic impact sound.

(5) The precision of each gear has a great influence on the noise.The roughness of the gear surface has a great influence on the noise of the gear, and the sound level of the noise has an approximately linear relationship with the roughness of the tooth surface.

(6) The influence of assembly quality on noise.When the installation error is small, the gear is greatly affected by the load deformation, and the load plays a decisive role in the noise; when the installation error is large, the noise increases sharply regardless of the load on the gear, but it is not mainly affected by the load deformation. .

(7) The tolerance of the center distance of the box components has an impact on the minimum backlash of the gears, and the interference between the tooth tops of the two gears and the tooth roots of the non-involute tooth profiles that are meshing will generate a lot of noise.

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