If the number of teeth of the gear is certain, the larger the modulus, the larger the radial size of the wheel. The modulus series standards are based on design, manufacturing and inspection requirements.
For gears with non-straight teeth, the modulus has the difference between the modular modulus MN, the end-to-surface modulus MS and the axial modulus MX, which are the ratios of the respective tooth spacing (the legal distance, the end tooth distance and the axial tooth spacing) and the circumference, and are also in millimeters.
For bevel gears, the modulus has the big end modulus me, the average modulus mm and the small end modulus m1. For the tool, there is the corresponding tool modulus and so on. Standard modulus is widely used. Standard modulus is one of the most basic parameters in metric gear transmission, worm drive, synchronous toothed belt transmission, ratchet, gear coupling, spline and other parts. It plays the role of basic parameters for the design, manufacture and maintenance of the above parts (see cylindrical gear transmission, worm drive, etc.).
