company news about Reasons for noise in gear transmission

When the gear is transmitting, it will produce noise due to the influence of many different factors such as assembly accuracy and manufacturing accuracy. The main reasons are meshing impact and pulsation impact.

1. Meshing impact

When a pair of gears are meshing, the gear teeth will be subjected to force, so in this process, they will definitely be impact-deformed. However, after the new gear teeth are meshing, the meshing load of the previous gear teeth is reduced to a certain extent, so the part of the gear that is deformed by the impact will return to its original shape and give the gear body tangential acceleration. At the same time, because the previous gear teeth changed their original shape after meshing, the new gear teeth could not obtain smooth contact with the theoretical tooth profile when meshing, so collision occurred, and finally meshing impulse was generated. When the gear is affected by the impact force, it will definitely produce various vibrations such as axial, radial and circumferential, so noise occurs.

2. Pulsation impact

When the involute gear is transmitting, the gear tooth contact points in the gear usually move in sequence on the meshing line. A series of studies have shown that since the position of the meshing point is constantly changing during gear transmission, the speed generated by the sliding between the tooth profiles on the meshing line will also be different. The two points where the meshing starts and ends are the largest, and the sliding speed of the pitch circle tangent point is zero. In addition, the magnitude and direction of the sliding speed will also change. Because of these reasons, the friction force will definitely change, thus generating the pitch line impulse. There is a direct and close relationship between the sliding speed of the friction force and the magnitude of the pitch line impulse. Therefore, the gear friction will gradually weaken as the gear transmission power increases, and the pulsation shock will gradually increase. There is no way to prevent the occurrence of pulsation shock when the gear teeth are meshing. The occurrence of pulsation shock will inevitably cause the gear to vibrate, thereby generating noise.