1. Pressure Angle
In order to deliver a certain amount of power, F must be kept constant. If the pressure angle a is increased, the normal force Fn on the tooth surface must be increased. This will increase the pitch and meshing forces on the actual tooth surface with frictional forces, thus increasing the vibration and noise levels. Although the error of the gear center distance does not affect the accurate meshing of the involute tooth profile, its variation causes a periodic change in the working pressure angle.
The gear teeth change to varying degrees when transmitting loads. In this way, at the moment of entering and disengaging the engagement impulse in the direction of the engagement line is generated, thus causing torsional vibration and noise.
3. Gear Accuracy
Gear noise is greatly affected by gear precision. The first step to reducing gear motor noise is to increase gear precision. For gears with low accuracy, any other noise reduction measures are in vain. Among the single errors, the two affected are the tooth pitch (base or peripheral) and tooth shape.
4. Gear Parameters and Structure Shape
Gear parameters include gear diameter, tooth width, and tooth blank structure.
5. Wheel Processing Technology
The wheel machining process methods include the gear hobbing process, shaving process, and heat-treatment process. The difference in these processes will also affect the gear noise of the gear motor.
6. Tooth Profile Modification
Due to the deviation of the circumferential teeth and the base joint and the elastic deformation of the gear teeth, when the gear is engaged, the impact and angular velocity changes are caused by the interference of the top blade meshing. When the peripheral section or base section of the passive wheel is greater than the nominal value, the top edge meshing will occur at the tooth tip of the passive wheel, which will generate vibration and noise. Tooth surface modification is to modify the gear teeth into drum-shaped teeth, so as to contact the middle of the tooth width first under load, and then gradually expand to the entire tooth width, so as to improve the load distribution and help reduce vibration and noise.