How to design the module of gear transmission?

How to design the module of gear transmission? Before answering this question, the first thing to know is what gear is here - bevel gear, spur gear, or face gear. The design of different gears is different.

Corresponding to different fields, the design criteria for gear transmission are also different. If it is a gear transmission in the field of consumer electronics, the transmission here is mainly to transmit motion actions, and the module design of the gears is more focused on tooth shape design. Firstly, the recommended modules for the first and second sequences specified in the national standard (mechanical design manual) should be used, and non-standard module gears should not be designed. In this case, the factory also needs to customize cutting tools, which will increase costs. The modulus design here is complementary to the parameter design of pressure angle, center distance, displacement coefficient, etc., and needs to be considered comprehensively.

If it is in the industrial field, gear transmission is not only the transmission of action, but more importantly, the transmission of torque (i.e. the input of energy). The gear module design here not only involves the design of tooth profile parameters, but also the calculation and verification of gear strength. As the gear module increases and the number of teeth decreases, the contact strength of the gear may decrease, and the gear may experience pitting and pitting on the tooth surface during actual motion; As the modulus decreases and the number of teeth increases, the bending strength of the gear may decrease. In the case of motor overload and high torque input, the gear teeth may break.