When designing pinion teeth, one of the important parameters is the modulus. The meshing of the gears produces the pulsation of the meshing, which is caused by the elastic deformation of the deformation of the gear teeth. As one of the basic parameters for designing gears, the modulus of the gear (if large) (that is, the size of the gear is large) has a relatively large load capacity. The modulus as a parameter is inversely proportional to the degree of bending of the gear teeth. If the modulus needs to be increased, it means that the stiffness of the gear teeth must be increased. This ensures that the elastic deformation of the gear teeth is not too large during snap drive. This greatly reduces gear tooth impact. From this point of view, it is better to increase the modulus appropriately.
However, when manufacturing gear teeth, the error is also directly related to the modulus. If the modulus increases, the error of the tooth shape and tooth spacing will also become larger. At this moment, the noise became louder.
Therefore, when choosing a modulus, the specific situation must be considered. The diameter of the gear is proportional to the number of teeth when the modulus is constant, therefore, the change of the number of teeth will also change the bending amount and elastic stiffness of the gear teeth: the noise generated by the sound source is not only related to the energy of the vibration source, but also related to the radiation area Size is related, if the radiation area increases, the radiation power will also increase.
Therefore increasing the diameter of the gear teeth will also increase the radiation area of the noise. This will greatly affect the effective control of gear noise. Therefore, when designing, as long as the stiffness of the teeth is within the allowable range, the number of teeth and the modulus should be as small as possible. The material can be selected reasonably and combined with special heat treatment to increase the tooth strength of the gear. In this way, the diameter of the gear teeth can be reduced and the noise of the gear teeth can be reduced.